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1

Numerical Modeling of Failure in Magnesium Alloys under Axial Compression and Bending for Crashworthiness Applications.  

E-Print Network [OSTI]

??Numerical modeling of failure was performed for magnesium alloys with circular and square cross-sections under axial compression. The failure criterion was employed using material model… (more)

Ali, Usman

2012-01-01T23:59:59.000Z

2

Failure surface model for oil shale  

SciTech Connect (OSTI)

One promising means of recovering oil from oil shale is to retort the shale in situ. Currently, modified in situ technology requires the construction of extensive underground openings or retorts. The remaining media (structure left around these retorts must support the overburden and contain the retorting shale. A failure criterion for oil shale, which is presented in this paper, was developed so that regions in the retort structure where the shale may be approaching failure can be identified. This criterion, adapted from composite materials applications, is essentially a closed surface in six-dimensional stress space and makes it possible to describe the anisotropic nature of failure in layered materials. The failure surface can be defined by five parameters which are determined from five simple laboratory tests. The surface is developed for a 80 ml/kg kerogen content shale and its features are discussed in detail. The predictions of the model are found to be in agreement with the results of a large number of laboratory tests, including uniaxial and triaxial compression tests. One unique (for rocks) test series is discussed which involves the failure of thin-walled tubes under combined compression and torsion. Finally, it is shown how the model can be extended to include the variation of material properties with kerogen content and temperature.

Costin, L.S.

1981-08-01T23:59:59.000Z

3

Development of a tribological failure knowledge model  

Science Journals Connector (OSTI)

Many of the component failures occurring in service can be delayed by better incorporation of tribological principles into engineering design and maintenance. However, the concept of tribology has not yet penetrated successfully into the industry in ... Keywords: JDK 14, Java Swing, KBS, Protege, component failures, design practice, knowledge based systems, knowledge modelling, maintenance strategy, steam power plants, steam turbines, tribological failure, tribology, turbine failure

S. Panda; D. Mishra

2010-08-01T23:59:59.000Z

4

Limitations and Failures of the Layzer Model  

SciTech Connect (OSTI)

We report several limitations and failure modes of the recently expanded Layzer model for hydrodynamic instabilities. The failures occur for large initial amplitudes, for stable accelerations, and for spikes in two-fluid systems.

Mikaelian, K O

2007-12-21T23:59:59.000Z

5

TYPE B RADIOACTIVE MATERIAL PACKAGE FAILURE MODES AND CONTENTS COMPLIANCE  

SciTech Connect (OSTI)

Type B radioactive material package failures can occur due to any one of the following: inadequate design, manufacture, and maintenance of packages, load conditions beyond those anticipated in the regulations, and improper package loading and operation. The rigorous package design evaluations performed in the certification process, robust package manufacture quality assurance programs, and demanding load conditions prescribed in the regulations are all well established. This paper focuses on the operational aspects of Type B package loading with respect to an overbatch which may cause a package failure.

Watkins, R; Steve Hensel, S; Allen Smith, A

2007-02-21T23:59:59.000Z

6

Reliability Models for Facility Location: The Expected Failure Cost ...  

E-Print Network [OSTI]

Reliability Models for Facility Location: The Expected Failure Cost Case. Lawrence V. Snyder (larry.snyder ***at*** lehigh.edu) Mark S. Daskin (m-daskin *

Lawrence V. Snyder

7

Ris-R-1736 (EN) Cohesive laws for assessment of materials failure  

E-Print Network [OSTI]

Risø-R-1736 (EN) Cohesive laws for assessment of materials failure: Theory, experimental methods resistance 0J d n , (1-8) on per unit fracture surface area. rovide a way to connect the bridging law laws for assessment of materials failure: Theory, experimental methods and application #12;#12;Cohesive

8

Large-Scale Atomistic Simulations of Material Failure  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

These simulations from 2000 examine the supersonic propagation of cracks and the formation of complex junction structures in metals. Eight simulations concerning brittle fracture, ductile failure, and shockless compression are available.

Abraham, Farid [IBM Almaden Research; Duchaineau, Mark [LLNL; Wirth, Brian [LLNL; Heidelberg,; Seager, Mark [LLNL; De La Rubia, Diaz [LLNL

9

Reactor Materials Program process water piping indirect failure frequency  

SciTech Connect (OSTI)

Following completion of the probabilistic analyses, the LOCA Definition Project has been subject to various external reviews, and as a result the need for several revisions has arisen. This report updates and summarizes the indirect failure frequency analysis for the process water piping. In this report, a conservatism of the earlier analysis is removed, supporting lower failure frequency estimates. The analysis results are also reinterpreted in light of subsequent review comments.

Daugherty, W.L.

1989-10-30T23:59:59.000Z

10

Embedding the Stable Failures Model of CSP in PVS  

Science Journals Connector (OSTI)

We present an embedding of the stable failures model of CSP in the PVS theorem prover. Our work ... a previous embedding of the traces model of CSP in [6], provides a platform for...

Kun Wei; James Heather

2005-01-01T23:59:59.000Z

11

Failure in shear bands for granular materials: thermo-hydro-chemo-mechanical effects  

E-Print Network [OSTI]

Failure in shear bands for granular materials: thermo-hydro-chemo- mechanical effects M. VEVEAKIS depends on the chemical reaction characteristics and that micro-inertia due to grain translations

Paris-Sud XI, Université de

12

Modeling Stress Strain Relationships and Predicting Failure Probabilities For Graphite Core Components  

SciTech Connect (OSTI)

This project will implement inelastic constitutive models that will yield the requisite stress-strain information necessary for graphite component design. Accurate knowledge of stress states (both elastic and inelastic) is required to assess how close a nuclear core component is to failure. Strain states are needed to assess deformations in order to ascertain serviceability issues relating to failure, e.g., whether too much shrinkage has taken place for the core to function properly. Failure probabilities, as opposed to safety factors, are required in order to capture the bariability in failure strength in tensile regimes. The current stress state is used to predict the probability of failure. Stochastic failure models will be developed that can accommodate possible material anisotropy. This work will also model material damage (i.e., degradation of mechanical properties) due to radiation exposure. The team will design tools for components fabricated from nuclear graphite. These tools must readily interact with finite element software--in particular, COMSOL, the software algorithm currently being utilized by the Idaho National Laboratory. For the eleastic response of graphite, the team will adopt anisotropic stress-strain relationships available in COMSO. Data from the literature will be utilized to characterize the appropriate elastic material constants.

Duffy, Stephen

2013-09-09T23:59:59.000Z

13

Accelerated Failure Time Regression Model with a Regression Model of Surviving Fraction: An Application to the Analysis of RPermanent EmploymentS in Japan  

E-Print Network [OSTI]

other hand, for any given accelerated failure-time model, weconsidered improvements of accelerated failure-time models.Although representative accelerated failure-time models can

Kazuo Yamaguchi

2011-01-01T23:59:59.000Z

14

Analysis of the causes of failure in high chrome oxide refractory materials from slagging gasifiers  

SciTech Connect (OSTI)

High Cr2O3 refractory materials are used to line the hot face of slagging gasifiers. Gasifiers are reaction chambers that convert water, oxygen, and a carbon feedstock into CO, H2, and methane at temperatures as high as 1575oC and pressures up to 1000 psi. Ash in the carbon feedstock liquefies, erodes and corrodes the gasifier’s refractory liner, contributing to liner failure within a few months to two years. The failure of a refractory liner decreases a gasifier’s on-line availability and causes costly system downtime and repairs. Many factors contribute to refractory lining failure, including slag penetration and corrosion, thermal cycling, gasifier environment, and mechanical loads. The results of refractory post-mortem failure analysis and how observations relate to gasifier service life will be discussed.

Bennett, J.P.; Kwong, K.-S.; Powell, C.A.; Thomas, H.; Krabbe, R.A.

2006-03-01T23:59:59.000Z

15

An analysis of the causes of failure in high chrome oxide refractory materials from slagging gasifiers  

SciTech Connect (OSTI)

High Cr2O3 refractory materials are used to line the hot face of slagging gasifiers. Gasifiers are reaction chambers that convert water, oxygen, and a carbon feedstock into CO, H2, and methane at temperatures as high as 1575DGC and pressures up to 1000 psi. Ash in the carbon feedstock liquefies, erodes and corrodes the gasifier's refractory liner, contributing to liner failure within a few months to two years. The failure of a refractory liner decreases a gasifier's on-line availability and causes costly system downtime and repairs. Many factors contribute to refractory lining failure, including slag penetration and corrosion, thermal cycling, gasifier environment, and mechanical loads. The results of refractory post-mortem failure analysis and how observations relate to gasifier service life will be discussed.

Bennett, James P.; Kwong, Kyei-Sing; Powell, Cynthia A.; Thomas, Hugh; Krabbe, Rick

2006-01-01T23:59:59.000Z

16

Physica A 264 (1999) 7583 Incipient failure in sandpile models  

E-Print Network [OSTI]

Physica A 264 (1999) 75­83 Incipient failure in sandpile models Onuttom Narayana; , Sidney R. Nagelb aDepartment of Physics, University of California, Santa Cruz, CA 95064, USA bThe James Franck Institute and Department of Physics, University of Chicago, Chicago, IL 60637, USA Received 13 October 1998

California at Santa Cruz, University of

17

Failure by fracture and fatigue in 'NANO' and 'BIO'materials  

SciTech Connect (OSTI)

The behavior of nanostructured materials/small-volumestructures and biologi-cal/bio-implantable materials, so-called "nano"and "bio" materials, is currently much in vogue in materials science. Oneaspect of this field, which to date has received only limited attention,is their fracture and fatigue properties. In this paper, we examine twotopics in this area, namely the premature fatigue failure ofsilicon-based micron-scale structures for microelectromechanical systems(MEMS), and the fracture properties of mineralized tissue, specificallyhuman bone.

Ritchie, R.O.; Muhlstein, C.L.; Nalla, R.K.

2003-12-19T23:59:59.000Z

18

Recent Advances in Computational Materials Science and Multiscale Materials Modeling  

E-Print Network [OSTI]

Recent Advances in Computational Materials Science and Multiscale Materials Modeling Guest Editors Advances in Computational Materials Science and Multiscale Materials Modeling. These symposia provide. Professor Karel Matous Aerospace and Mechanical Engineering Department University of Notre Dame Email

Matous, Karel

19

Failure Predictions for VHTR Core Components using a Probabilistic Contiuum Damage Mechanics Model  

SciTech Connect (OSTI)

The proposed work addresses the key research need for the development of constitutive models and overall failure models for graphite and high temperature structural materials, with the long-term goal being to maximize the design life of the Next Generation Nuclear Plant (NGNP). To this end, the capability of a Continuum Damage Mechanics (CDM) model, which has been used successfully for modeling fracture of virgin graphite, will be extended as a predictive and design tool for the core components of the very high- temperature reactor (VHTR). Specifically, irradiation and environmental effects pertinent to the VHTR will be incorporated into the model to allow fracture of graphite and ceramic components under in-reactor conditions to be modeled explicitly using the finite element method. The model uses a combined stress-based and fracture mechanics-based failure criterion, so it can simulate both the initiation and propagation of cracks. Modern imaging techniques, such as x-ray computed tomography and digital image correlation, will be used during material testing to help define the baseline material damage parameters. Monte Carlo analysis will be performed to address inherent variations in material properties, the aim being to reduce the arbitrariness and uncertainties associated with the current statistical approach. The results can potentially contribute to the current development of American Society of Mechanical Engineers (ASME) codes for the design and construction of VHTR core components.

Fok, Alex

2013-10-30T23:59:59.000Z

20

Mathematical modelings of smart materials and structures  

E-Print Network [OSTI]

Mathematical modelings of smart materials and structures Christian Licht , Thibaut Weller mathematical models of smart materials and smart structures. Smart materials are materials which present perturbations methods, asymptotic analysis, plates and rods models. 1 Introduction Smart materials present

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Web crippling failure using quasi-static FE models  

Science Journals Connector (OSTI)

Abstract This paper presents an investigation on the use of quasi-static analyses with explicit integration to evaluate the web crippling behaviour of cold-formed steel beams. Web crippling failure occurs due to the application of transverse concentrated loads, which can be applied statically or dynamically. In the majority of the examples found in the literature, the web crippling phenomenon has been investigated by means of purely static shell finite element (SFE) models with implicit integration. In this work, the ABAQUS code was employed to implement SFE models aimed at replicating an experimental test and quasi-static analyses with an explicit integration scheme were adopted. First, a brief literature review on the topic of the numerical investigation of web crippling of cold-formed steel members is presented. Then, the paper addresses the characterisation of the quasi-static analysis concept with particular emphasis on the control of dynamic effects and the SFE model of a lipped channel beam under External Two Flange (ETF) loading is described. Several conventional parameters of standard SFE analysis, such as the SFE type, mesh selection, steel model, hardening effects due to cold-forming, residual stresses, initial imperfections and support conditions are explained, as well as additional specifications pertaining to the adoption of quasi-static analyses, such as the load rate, mass scaling, contact and friction, smoothed amplitude curves and inhibition of inertia (noise) effects. Finally, the results obtained are presented in the context of the ETF case, including load–displacement curves, curves of kinetic-to-internal energy ratio vs. displacement and beam deformed shapes (failure modes). It is concluded that explicit analysis leads to rigorous simulations of experimental test results, in terms of ultimate load, post-collapse load–deflection curve and failure mechanism. The failure mode obtained with the quasi-static analysis provides a better approximation of the one observed experimentally than its non-linear static analysis counterpart. Indeed, the failure mechanism emerges considerably more clearly when the quasi-static analysis is adopted.

P. Natário; N. Silvestre; D. Camotim

2014-01-01T23:59:59.000Z

22

Transient failure of zircaloy cladding: State-of-the-art study and model development: Final report  

SciTech Connect (OSTI)

A state of the art study of transient failure of zircaloy reveals that a wide range of failure models exist, and their use in fuel analysis depends upon the type of application. Licensing analyses, for example, employ highly simplified criteria that depict cladding rupture in terms of a single response variable, usually the nominal circumferential stress, as function of temperature; while fuel behavior analyses use more detailed models with varying levels of sophistication. Some of these models, however, are ill-suited for detailed fuel rod analysis computer codes because of their dependence on case-specific parameters; others are limited in their utility because of inherent deficiencies in their theoretical treatment of the phenomena involved. Based on this study, a new zircaloy transient failure model is developed that takes account of the important variables involved in transient phenomena, namely, heating rate, strain rate, temperature, true stress, true strain, and prior condition of the cladding material. The model is particularly suited for detailed fuel rod analysis and thus was implemented in the FREY code.

Rashid, Y.R.

1986-12-01T23:59:59.000Z

23

Modeling Stakeholder/Value Dependency through Mean Failure Cost  

SciTech Connect (OSTI)

In an earlier series of works, Boehm et al. discuss the nature of information system dependability and highlight the variability of system dependability according to stakeholders. In a recent paper, the dependency patterns of this model are analyzed. In our recent works, we presented a stakeholder dependent quantitative security model, where we quantify security for a given stakeholder by the mean of the loss incurred by the stakeholder as a result of security threats. We show how this mean can be derived from the security threat configuration (represented as a vector of probabilities that reflect the likelihood of occurrence of the various security threats). We refer to our security metric as MFC, for Mean Failure Cost. In this paper, we analyze Boehm's model from the standpoint of the proposed metric, and show whether, to what extent, and how our metric addresses the issues raised by Boehm's Stakeholder/Value definition of system dependability.

Aissa, Anis Ben [University of Tunis, Belvedere, Tunisia] [University of Tunis, Belvedere, Tunisia; Abercrombie, Robert K [ORNL] [ORNL; Sheldon, Frederick T [ORNL] [ORNL; Mili, Ali [New Jersey Insitute of Technology] [New Jersey Insitute of Technology

2010-01-01T23:59:59.000Z

24

Heartbeat Model for Component Failure in Simulation of Plant Behavior  

SciTech Connect (OSTI)

As part of the Department of Energy’s “Light Water Reactor Sustainability Program” (LWRSP), tools and methodology for risk-informed characterization of safety margin are being developed for use in supporting decision-making on plant life extension after the first license renewal. Beginning with the traditional discussion of “margin” in terms of a “load” (a physical challenge to system or component function) and a “capacity” (the capability of that system or component to accommodate the challenge), we are developing the capability to characterize realistic probabilistic load and capacity spectra, reflecting both aleatory and epistemic uncertainty in system behavior. This way of thinking about margin comports with work done in the last 10 years. However, current capabilities to model in this way are limited: it is currently possible, but difficult, to validly simulate enough time histories to support quantification in realistic problems, and the treatment of environmental influences on reliability is relatively artificial in many existing applications. The INL is working on a next-generation safety analysis capability (widely referred to as “R7”) that will enable a much better integration of reliability-related and phenomenology-related aspects of margin. In this paper, we show how to implement cumulative damage (“heartbeat”) models for component reliability that lend themselves naturally to being included as part of the phenomenology simulation. Implementation of this modeling approach relies on the way in which the phenomenology simulation implements its dynamic time step management. Within this approach, component failures influence the phenomenology, and the phenomenology influences the component failures.

R. W. Youngblood; R. R. Nourgaliev; D. L. Kelly; C. L. Smith; T-N. Dinh

2011-03-01T23:59:59.000Z

25

Modeling Coulombic failure of sea ice with leads Alexander V. Wilchinsky1  

E-Print Network [OSTI]

Modeling Coulombic failure of sea ice with leads Alexander V. Wilchinsky1 and Daniel L. Feltham1 ice failure under lowconfinement compression is modeled with a linear Coulombic criterion that can of anisotropy we consider a simplified anisotropic sea ice model where the sea ice thickness depends

Feltham, Daniel

26

In-Vessel Coil Material Failure Rate Estimates for ITER Design Use  

SciTech Connect (OSTI)

The ITER international project design teams are working to produce an engineering design for construction of this large tokamak fusion experiment. One of the design issues is ensuring proper control of the fusion plasma. In-vessel magnet coils may be needed for plasma control, especially the control of edge localized modes (ELMs) and plasma vertical stabilization (VS). These coils will be lifetime components that reside inside the ITER vacuum vessel behind the blanket modules. As such, their reliability is an important design issue since access will be time consuming if any type of repair were necessary. The following chapters give the research results and estimates of failure rates for the coil conductor and jacket materials to be used for the in-vessel coils. Copper and CuCrZr conductors, and stainless steel and Inconel jackets are examined.

L. C. Cadwallader

2013-01-01T23:59:59.000Z

27

A robust Bayesian approach to modeling epistemic uncertainty in common-cause failure models  

SciTech Connect (OSTI)

In a standard Bayesian approach to the alpha-factor model for common-cause failure, a precise Dirichlet prior distribution models epistemic uncertainty in the alpha-factors. This Dirichlet prior is then updated with observed data to obtain a posterior distribution, which forms the basis for further inferences. In this paper, we adapt the imprecise Dirichlet model of Walley to represent epistemic uncertainty in the alpha-factors. In this approach, epistemic uncertainty is expressed more cautiously via lower and upper expectations for each alpha-factor, along with a learning parameter which determines how quickly the model learns from observed data. For this application, we focus on elicitation of the learning parameter, and find that values in the range of 1 to 10 seem reasonable. The approach is compared with Kelly and Atwood's minimally informative Dirichlet prior for the alpha-factor model, which incorporated precise mean values for the alpha-factors, but which was otherwise quite diffuse. Next, we explore the use of a set of Gamma priors to model epistemic uncertainty in the marginal failure rate, expressed via a lower and upper expectation for this rate, again along with a learning parameter. As zero counts are generally less of an issue here, we find that the choice of this learning parameter is less crucial. Finally, we demonstrate how both epistemic uncertainty models can be combined to arrive at lower and upper expectations for all common-cause failure rates. Thereby, we effectively provide a full sensitivity analysis of common-cause failure rates, properly reflecting epistemic uncertainty of the analyst on all levels of the common-cause failure model.

Matthias C. M. Troffaes; Gero Walter; Dana Kelly

2014-05-01T23:59:59.000Z

28

Dependable Systems of Systems PCE4: Models of Organisational Failure1 IST-1999-11585  

E-Print Network [OSTI]

Dependable Systems of Systems PCE4: Models of Organisational Failure1 DSoS IST-1999 Report Version: Deliverable (PCE4) Report Preparation Date: 1 December 2002 Classification: Public Technology" Programme (1998- 2002) #12;Dependable Systems of Systems PCE4: Models of Organisational Failure2

Newcastle upon Tyne, University of

29

Module-based Failure Propagation (MFP) model for FMEA  

Science Journals Connector (OSTI)

Failure mode and effect analysis (FMEA) is one of the most important activities ... Within the field of product development domain, FMEA is regarded as a key driver for ... and cost reduction. There have been var...

Kyoung-Won Noh; Hong-Bae Jun; Jae-Hyun Lee…

2011-07-01T23:59:59.000Z

30

Statistical Modeling of Corrosion Failures in Natural Gas Transmission Pipelines  

E-Print Network [OSTI]

Natural gas pipelines are a critical component of the U.S. energy infrastructure. The safety of these pipelines plays a key role for the gas industry. Therefore, the understanding of failure characteristics and their consequences are very important...

Cobanoglu, Mustafa Murat

2014-03-28T23:59:59.000Z

31

Micromechanical Damage Models for Continuous Fiber Reinforced Composite Materials  

E-Print Network [OSTI]

reinforced plastic matrix composite, Material and Design,1995). Failure of fiber composites: a lattice green functionreinforced titanium composites, Composites Science and

Wu, Yi

2013-01-01T23:59:59.000Z

32

High Accuracy 65nm OPC Verification: Full Process Window Model vs. Critical Failure ORC  

E-Print Network [OSTI]

High Accuracy 65nm OPC Verification: Full Process Window Model vs. Critical Failure ORC Amandine of Mask Rule Checking (MRC) and Optical Rule Checking (ORC) have become indispensable tools for ensuring, a technique known as Critical Failure ORC (CFORC) was introduced that uses optical parameters from aerial

Boyer, Edmond

33

Composite materials non-linear modelling for long fibre-reinforced laminates  

Science Journals Connector (OSTI)

An innovative computational methodology is proposed for modelling the material non-linear mechanical behaviour of FRP structures. To model a single unidirectional composite lamina, a serial-parallel (SP) continuum approach has been developed assuming ... Keywords: Composite failure, FEM, FRP, Long fibre laminates, Non-linear modelling

Fernando Rastellini; Sergio Oller; Omar Salomón; Eugenio Oñate

2008-05-01T23:59:59.000Z

34

High Temperature Expansion Due to Compression Test for the Determination of a Cladding Material Failure Criterion under RIA Loading Conditions  

SciTech Connect (OSTI)

This paper is mainly dedicated to the development of an out-of-pile test reproducing the thermo-mechanical loading conditions encountered during the first stage of a Reactivity Initiated Accidents (RIA) transient, dominated by Pellet Clad Mechanical Interaction (PCMI). In particular, the strain-controlled clad loading under high strain rate associated with temperatures up to 600 deg. C expected during the PCMI phase is simulated by an Expansion Due to Compression (EDC) test achievable at high temperature. The use of appropriate materials for the inner pellet made it possible to achieve the tests from 20 deg. C up to 900 deg. C. The interpretation of the test data is supported by Finite Element Analysis (FEA) including parameters tuned using an inverse method coupling FEA and tests results. A deformation model, identified upon the PROMETRA (Transient Mechanical Properties) experimental database and describing the anisotropic viscoplastic behavior of Cold-Worked Stress Relieved Zircaloy-4 cladding alloys under typical RIA loading conditions, is exploited. The combined analysis of experimental results and finite element simulations provides a deeper understanding of the deformation mode (near pure hoop tension) that arises during the tests. The failure mode appears to be representative of that obtained on tubes during the PCMI stage of RIA experiments. An appropriate device is currently developed in order to reach a bi-axiality of the loading path closer to that expected during the PCMI stage (between plane-strain and equal-biaxial tension). (authors)

Le Saux, M.; Poussard, C.; Averty, X.; Sainte Catherine, C.; Carassou, S. [CEA-Saclay, DEN/DMN/SEMI, 91191 Gif-Sur-Yvette (France); Besson, J. [Centre des Materiaux, Mines Paris, CNRS UMR 7633, BP 87, 91003 Evry (France)

2007-07-01T23:59:59.000Z

35

ARRA: Reconfiguring Power Systems to Minimize Cascading Failures - Models and Algorithms  

SciTech Connect (OSTI)

Building on models of electrical power systems, and on powerful mathematical techniques including optimization, model predictive control, and simluation, this project investigated important issues related to the stable operation of power grids. A topic of particular focus was cascading failures of the power grid: simulation, quantification, mitigation, and control. We also analyzed the vulnerability of networks to component failures, and the design of networks that are responsive to and robust to such failures. Numerous other related topics were investigated, including energy hubs and cascading stall of induction machines

Dobson, Ian [Iowa State University] [Iowa State University; Hiskens, Ian [Unversity of Michigan] [Unversity of Michigan; Linderoth, Jeffrey [University of Wisconsin-Madison] [University of Wisconsin-Madison; Wright, Stephen [University of Wisconsin-Madison] [University of Wisconsin-Madison

2013-12-16T23:59:59.000Z

36

Cohesive zone modeling of dynamic failure in homogeneous and functionally  

E-Print Network [OSTI]

in a continuous manner. This new concept of engineering the material microstructure and recent advances in material processing science allows one to fully integrate material and structural design considerations of thermal barrier coat- ings for aerospace applications, however, subsequent investigations have addressed

Paulino, Glaucio H.

37

An Attempt to Calibrate and Validate a Simple Ductile Failure Model Against Axial-Torsion Experiments on Al 6061-T651.  

SciTech Connect (OSTI)

This report details a work in progress. We have attempted to calibrate and validate a Von Mises plasticity model with the Johnson-Cook failure criterion ( Johnson & Cook , 1985 ) against a set of experiments on various specimens of Al 6061-T651. As will be shown, the effort was not successful, despite considerable attention to detail. When the model was com- pared against axial-torsion experiments on tubes, it over predicted failure by 3 x in tension, and never predicted failure in torsion, even when the tube was twisted by 4 x further than the experiment. While this result is unfortunate, it is not surprising. Ductile failure is not well understood. In future work, we will explore whether more sophisticated material mod- els of plasticity and failure will improve the predictions. Selecting the appropriate advanced material model and interpreting the results of said model are not trivial exercises, so it is worthwhile to fully investigate the behavior of a simple plasticity model before moving on to an anisotropic yield surface or a similarly complicated model.

Reedlunn, Benjamin; Lu, Wei-Yang [Sandia National Laboratories, Livermore, CA

2015-01-01T23:59:59.000Z

38

Ordinal Logistic Regression Model of Failure Mode and Effects Analysis (FMEA) in Pharmaceutical Tabletting Tools  

Science Journals Connector (OSTI)

The main objective of this paper is to use Ordinal Logistic Regression Modeling (OLRM) to predict and to investigate the relationship(s) between the different types of failures encountered in tableting tools of pharmaceutical industry and relevant tablet- and punch attributes. This would help minimize the occurrence of such failures in and avoid potential failure occurrences in future punch designs. Three punch attributes (punch diameter, location and shape) and five product attributes (tablet mass (gm), hardness (Kp), thickness (mm), moisture content (percent loss on drying (LOD %)) and sieve size (mm)) have been investigated in terms of their relative contributions towards different failure types. The present OLRM model has been successfully applied to the predict failure types according to the aforementioned factors. Furthermore, OLRM quantitatively links and evaluates the effects and contribution of each of these factors to the occurrence of different failure types. The OLRM methodology has been validated conveniently and proved to be powerful prediction tool. This is indicated by the marginal 2.4% error percentage encountered.

Mohammad D. AL-Tahat; Abdul Kareem M. Abdul Jawwad; Yousef L. Abu Nahleh

2013-01-01T23:59:59.000Z

39

Advancing Material Models for Automotive Forming Simulations  

SciTech Connect (OSTI)

Simulations in automotive industry need more advanced material models to achieve highly reliable forming and springback predictions. Conventional material models implemented in the FEM-simulation models are not capable to describe the plastic material behaviour during monotonic strain paths with sufficient accuracy. Recently, ESI and Corus co-operate on the implementation of an advanced material model in the FEM-code PAMSTAMP 2G. This applies to the strain hardening model, the influence of strain rate, and the description of the yield locus in these models. A subsequent challenge is the description of the material after a change of strain path.The use of advanced high strength steels in the automotive industry requires a description of plastic material behaviour of multiphase steels. The simplest variant is dual phase steel consisting of a ferritic and a martensitic phase. Multiphase materials also contain a bainitic phase in addition to the ferritic and martensitic phase. More physical descriptions of strain hardening than simple fitted Ludwik/Nadai curves are necessary.Methods to predict plastic behaviour of single-phase materials use a simple dislocation interaction model based on the formed cells structures only. At Corus, a new method is proposed to predict plastic behaviour of multiphase materials have to take hard phases into account, which deform less easily. The resulting deformation gradients create geometrically necessary dislocations. Additional micro-structural information such as morphology and size of hard phase particles or grains is necessary to derive the strain hardening models for this type of materials.Measurements available from the Numisheet benchmarks allow these models to be validated. At Corus, additional measured values are available from cross-die tests. This laboratory test can attain critical deformations by large variations in blank size and processing conditions. The tests are a powerful tool in optimising forming simulations prior to larger scale industrial validation.

Vegter, H.; An, Y.; Horn, C.H.L.J. ten; Atzema, E.H.; Roelofsen, M.E. [Corus Research Development and Technology, PO Box 10000, 1970 CA IJmuiden (Netherlands)

2005-08-05T23:59:59.000Z

40

Modeling cascading failures in the North American power grid  

Science Journals Connector (OSTI)

The North American power grid is one of the most complex technological ... the propagation of disturbances. We model the power grid using its actual topology and plausible assumptions... ...

R. Kinney; P. Crucitti; R. Albert; V. Latora

2005-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

New Computer Model Pinpoints Prime Materials for Carbon Capture  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Model Pinpoints Prime Materials for Carbon Capture New Computer Model Pinpoints Prime Materials for Carbon Capture July 17, 2012 | Tags: Dirac, Energy Technologies, Materials...

42

Acquisition and modeling of material appearance  

E-Print Network [OSTI]

In computer graphics, the realistic rendering of synthetic scenes requires a precise description of surface geometry, lighting, and material appearance. While 3D geometry scanning and modeling have advanced significantly ...

Ngan, Wai Kit Addy, 1979-

2006-01-01T23:59:59.000Z

43

Modeling of fatigue for cellular materials  

SciTech Connect (OSTI)

Dimensional arguments are used to analyze the fatigue of cellular materials. A modeling describing the fatigue of foams with or without macrocrack is derived and compared to the existing experimental data of cementitious foams and phenolic foams; agreement is good.

Huang, J.S.; Lin, J.Y. [National Cheng Kung Univ., Tainan (Taiwan, Province of China). Dept. of Civil Engineering

1998-12-31T23:59:59.000Z

44

A Novel Virtual Age Reliability Model for Time-to-Failure Prediction  

E-Print Network [OSTI]

counts, devices approaching physical feature size limits and nuclear plant comparable power densityA Novel Virtual Age Reliability Model for Time-to-Failure Prediction Yao Wang, Sorin Cotofana their relatively short operating lifetime. To overcome the MTTF weakness, this paper proposes a novel virtual age

Kuzmanov, Georgi

45

Modeling and Characterization of Dynamic Failure of Soda-lime Glass Under High Speed Impact  

SciTech Connect (OSTI)

In this paper, the impact-induced dynamic failure of a soda-lime glass block is studied using an integrated experimental/analytical approach. The Split Hopkinson Pressure Bar (SHPB) technique is used to conduct dynamic failure test of soda-lime glass first. The damage growth patterns and stress histories are reported for various glass specimen designs. Making use of a continuum damage mechanics (CDM)-based constitutive model, the initial failure and subsequent stiffness reduction of glass are simulated and investigated. Explicit finite element analyses are used to simulate the glass specimen impact event. A maximum shear stress-based damage evolution law is used in describing the glass damage process under combined compression/shear loading. The impact test results are used to quantify the critical shear stress for the soda-lime glass under examination.

Liu, Wenning N.; Sun, Xin; Chen, Weinong W.; Templeton, Douglas W.

2012-05-27T23:59:59.000Z

46

Combining Modeling Methodologies for Improved Understanding of Smart Material Characteristics  

E-Print Network [OSTI]

Combining Modeling Methodologies for Improved Understanding of Smart Material Characteristics Material Systems and Structures February 2, 1998 ABSTRACT Smart materials are complex materials performance capabilities but the synergistic response of the smart material and companion structure. Behavior

Lindner, Douglas K.

47

Global nuclear material flow/control model  

SciTech Connect (OSTI)

This is the final report of a two-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The nuclear danger can be reduced by a system for global management, protection, control, and accounting as part of an international regime for nuclear materials. The development of an international fissile material management and control regime requires conceptual research supported by an analytical and modeling tool which treats the nuclear fuel cycle as a complete system. The prototype model developed visually represents the fundamental data, information, and capabilities related to the nuclear fuel cycle in a framework supportive of national or an international perspective. This includes an assessment of the global distribution of military and civilian fissile material inventories, a representation of the proliferation pertinent physical processes, facility specific geographic identification, and the capability to estimate resource requirements for the management and control of nuclear material. The model establishes the foundation for evaluating the global production, disposition, and safeguards and security requirements for fissile nuclear material and supports the development of other pertinent algorithmic capabilities necessary to undertake further global nuclear material related studies.

Dreicer, J.S.; Rutherford, D.S.; Fasel, P.K.; Riese, J.M.

1997-10-01T23:59:59.000Z

48

Theory and Modeling of Weakly Bound/Physisorbed Materials for...  

Broader source: Energy.gov (indexed) [DOE]

Theory and Modeling of Weakly BoundPhysisorbed Materials for Hydrogen Storage Theory and Modeling of Weakly BoundPhysisorbed Materials for Hydrogen Storage Presentation on the...

49

NUMERICAL MODELING OF CATHODE CONTACT MATERIAL DENSIFICATION  

SciTech Connect (OSTI)

Numerical modeling was used to simulate the constrained sintering process of the cathode contact layer during assembly of solid oxide fuel cells (SOFCs). A finite element model based on the continuum theory for sintering of porous bodies was developed and used to investigate candidate low-temperature cathode contact materials. Constitutive parameters for various contact materials under investigation were estimated from dilatometry screening tests, and the influence of processing time, processing temperature, initial grain size, and applied compressive stress on the free sintering response was predicted for selected candidate materials. The densification behavior and generated stresses within a 5-cell planar SOFC stack during sintering, high temperature operation, and room temperature shutdown were predicted. Insufficient constrained densification was observed in the stack at the proposed heat treatment, but beneficial effects of reduced grain size, compressive stack preload, and reduced thermal expansion coefficient on the contact layer densification and stresses were observed.

Koeppel, Brian J.; Liu, Wenning N.; Stephens, Elizabeth V.; Khaleel, Mohammad A.

2011-11-01T23:59:59.000Z

50

Modeling of magnetostrictive materials and structures  

SciTech Connect (OSTI)

The constitutive model for a magnetostrictive material and its effect on the structural response is presented in this article. The example of magnetostrictive material considered is the TERFENOL-D. As like the piezoelectric material, this material has two constitutive laws, one of which is the sensing law and the other is the actuation law, both of which are highly coupled and non-linear. For the purpose of analysis, the constitutive laws can be characterized as coupled or uncoupled and linear or non linear. Coupled model is studied without assuming any explicit direct relationship with magnetic field. In the linear coupled model, which is assumed to preserve the magnetic flux line continuity, the elastic modulus, the permeability and magnetoelastic constant are assumed as constant. In the nonlinear-coupled model, the nonlinearity is decoupled and solved separately for the magnetic domain and the mechanical domain using two nonlinear curves, namely the stress vs. strain curve and the magnetic flux density vs. magnetic field curve. This is performed by two different methods. In the first, the magnetic flux density is computed iteratively, while in the second, the artificial neural network is used, where in the trained network will give the necessary strain and magnetic flux density for a given magnetic field and stress level. The effect of nonlinearity is demonstrated on a simple magnetostrictive rod.

Gopalakrishnan, S. [Department of Aerospace Engineering Indian Institute of Science Bangalore 560 012 (India)

2008-07-29T23:59:59.000Z

51

Critical points and transitions in an electric power transmission model for cascading failure blackouts  

Science Journals Connector (OSTI)

Cascading failures in large-scale electric power transmission systems are an important cause of blackouts. Analysis of North American blackout data has revealed power law (algebraic) tails in the blackout size probability distribution which suggests a dynamical origin. With this observation as motivation we examine cascading failure in a simplified transmission system model as load power demand is increased. The model represents generators loads the transmission line network and the operating limits on these components. Two types of critical points are identified and are characterized by transmission line flow limits and generator capability limits respectively. Results are obtained for tree networks of a regular form and a more realistic 118-node network. It is found that operation near critical points can produce power law tails in the blackout size probability distribution similar to those observed. The complex nature of the solution space due to the interaction of the two critical points is examined.

B. A. Carreras; V. E. Lynch; I. Dobson; D. E. Newman

2002-01-01T23:59:59.000Z

52

Irreversible Thermodynamics and Smart Materials Systems Modelling. Example of  

E-Print Network [OSTI]

Irreversible Thermodynamics and Smart Materials Systems Modelling. Example of Magnetic Shape Memory mechanisms in smart materials. This procedure is applied to Magnetic Shape Memory Alloys actuators of complex active materials for smart systems. Keywords: Smart material systems, Actuator design

Paris-Sud XI, Université de

53

Design and development of modified service failure mode and effects analysis model  

Science Journals Connector (OSTI)

One of the prominent techniques in the field of Total Quality Management (TQM) is Failure Mode and Effects Analysis (FMEA). FMEA facilitates the recording of failures and analysing them to provide solutions for preventing their recurrence. During the early periods of FMEA evolution, there were two types namely Design FMEA and Process FMEA (PFMEA) in practice. In recent days, more types such as System FMEA, Service FMEA and Maintenance FMEA are being prescribed by the researchers. Meanwhile, a number of benefits of FMEA implementation have been reported. Yet, FMEA has not found its implementation in various fields. One among them is service field. This paper reports the examination of FMEA implementation in service industry. This direction of research led to the design of an improved model, named as 'Modified service FMEA'. Its implementation was examined in an Indian State Government owned passenger Transport Company. Despite certain practical hurdles, this exercise was successful in developing modified service FMEA table and pinpointing the seriousness of failures through the portrayal of Service Lost (SL) and Cost Lost (CL).

C. Jegadheesan; V.P. Arunachalam; S.R. Devadasan; P.S.S. Srinivasan

2007-01-01T23:59:59.000Z

54

The development of design factors for heat-strengthened and tempered glass based on the glass failure prediction model  

E-Print Network [OSTI]

THE DEVELOPMENT OF DESIGN FACTORS FOR HEAT-STRENGTHENED AND TEMPERED GLASS BASED ON THE GLASS FAILURE PREDICTION MODEL A Thesis by Timothy Andrew Oakes Submitted to the Office of Graduate Studies of Texas A&M University in partial... fulfillment of the requirements for the degree of MASTER OF SCIENCE Decypber 199$ Major Subject: Civil Engineering THE DEVELOPMENT OF DESIGN FACTORS FOR HEAT-STRENGTHENED AND TEMPERED GLASS BASED ON THE GLASS FAILURE PREDICTION MODEL A Thesis...

Oakes, Timothy Andrew

1991-01-01T23:59:59.000Z

55

A mid-layer model for human reliability analysis : understanding the cognitive causes of human failure events.  

SciTech Connect (OSTI)

The Office of Nuclear Regulatory Research (RES) at the US Nuclear Regulatory Commission (USNRC) is sponsoring work in response to a Staff Requirements Memorandum (SRM) directing an effort to establish a single human reliability analysis (HRA) method for the agency or guidance for the use of multiple methods. As part of this effort an attempt to develop a comprehensive HRA qualitative approach is being pursued. This paper presents a draft of the method's middle layer, a part of the qualitative analysis phase that links failure mechanisms to performance shaping factors. Starting with a Crew Response Tree (CRT) that has identified human failure events, analysts identify potential failure mechanisms using the mid-layer model. The mid-layer model presented in this paper traces the identification of the failure mechanisms using the Information-Diagnosis/Decision-Action (IDA) model and cognitive models from the psychological literature. Each failure mechanism is grouped according to a phase of IDA. Under each phase of IDA, the cognitive models help identify the relevant performance shaping factors for the failure mechanism. The use of IDA and cognitive models can be traced through fault trees, which provide a detailed complement to the CRT.

Shen, Song-Hua (US Nuclear Regulatory Commission, Washington, DC); Chang, James Y. H. (US Nuclear Regulatory Commission, Washington, DC); Boring,Ronald L. (Idaho National Laboratory, Idaho Falls, ID); Whaley, April M. (Idaho National Laboratory, Idaho Falls, ID); Lois, Erasmia (US Nuclear Regulatory Commission, Washington, DC); Hendrickson, Stacey M. Langfitt; Oxstrand, Johanna H. (Vattenfall Ringhals AB, Varobacka, Sweden); Forester, John Alan; Kelly, Dana L. (Idaho National Laboratory, Idaho Falls, ID); Mosleh, Ali (University of Maryland, College Park, MD)

2010-03-01T23:59:59.000Z

56

A Stress-Based Non-Proportionality Parameter for Considering the Resistance of Slip Systems of Shear Failure Mode Materials  

Science Journals Connector (OSTI)

Abstract Multiaxial loading on mechanical products is very common in the automotive industry, and how to design and analyze these products for durability becomes an important, urgent task for the engineering community. Due to the complex nature of the fatigue damage mechanism for a product under multiaxial state of stresses/strains which are dependent upon the modes of loading, materials, and life, modeling this behavior has always been a challenging task for fatigue scientists and engineers around the world. As a result, many multiaxial fatigue theories have been developed. Among all the theories, an existing equivalent stress theory is considered for use for the automotive components that are typically designed to prevent Case B cracks in the high cycle fatigue regime. The focus of this paper is on the introduction of the equivalent stress model with an emphasis on characterizing a non-proportionality parameter to account for material dependent resistance of interactions between slip systems under nonproportional loading. This parameter is determined experimentally by comparing stress-life curves for two extreme loading cases, in-phase and 90o out-of-phase axial-torsional fatigue tests. However, multiaxial testing is very expensive and time consuming. As a result, an empirical formula was developed for the non-proportionality parameter, ?LTJ, based on readily available material properties.

Sean A. McKelvey; Yung-Li Lee

2014-01-01T23:59:59.000Z

57

Life Cycle Modeling of Propulsion Materials  

Broader source: Energy.gov (indexed) [DOE]

propulsion materials manufacturing technologies with an emphasis on aluminum, magnesium, titanium, and ceramics * Advanced propulsion materials' potential in heavy-duty...

58

Multiscale Modeling and Homogenization of Composite Materials  

E-Print Network [OSTI]

Schematics of fiber composite . . . . . . . . . .of long fiber sic/ti composite materials. Comput. Methodsof Fibre-reinforced composites. Wiley, 4th edition, 2002. [

Mseis, George

2010-01-01T23:59:59.000Z

59

Materials Theory, Modeling and Simulation | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Dean or Hans Christen Recent Research Highlights 1-5 of 6 Results <12> Scientists Connect Thermoelectric Materials and Topological Insulators January 20, 2015 - Quantum mechanical...

60

Formulation and computational aspects of plasticity and damage models with application to quasi-brittle materials  

SciTech Connect (OSTI)

The response of underground structures and transportation facilities under various external loadings and environments is critical for human safety as well as environmental protection. Since quasi-brittle materials such as concrete and rock are commonly used for underground construction, the constitutive modeling of these engineering materials, including post-limit behaviors, is one of the most important aspects in safety assessment. From experimental, theoretical, and computational points of view, this report considers the constitutive modeling of quasi-brittle materials in general and concentrates on concrete in particular. Based on the internal variable theory of thermodynamics, the general formulations of plasticity and damage models are given to simulate two distinct modes of microstructural changes, inelastic flow and degradation of material strength and stiffness, that identify the phenomenological nonlinear behaviors of quasi-brittle materials. The computational aspects of plasticity and damage models are explored with respect to their effects on structural analyses. Specific constitutive models are then developed in a systematic manner according to the degree of completeness. A comprehensive literature survey is made to provide the up-to-date information on prediction of structural failures, which can serve as a reference for future research.

Chen, Z.; Schreyer, H.L. [New Mexico Engineering Research Institute, Albuquerque, NM (United States)

1995-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

A Simple GSPN for Modeling Common Mode Failures in Critical Infrastructures  

E-Print Network [OSTI]

of electric power has major consequences on telecommunications, transportation, water, sewage, and natural gas for reliability in benign operating environments. As such, they are susceptible to cascading failures induced leading to the cascading failure. We suspect that sources of common mode faults in real-time control

Krings, Axel W.

62

Non-destructive Failure Analysis and Modeling of Encapsulated Miniature SMD Ceramic Chip Capacitors under Thermal and  

E-Print Network [OSTI]

Non-destructive Failure Analysis and Modeling of Encapsulated Miniature SMD Ceramic Chip Capacitors under Thermal and Mechanical Loading B. Wunderle1 , T. Braun1 , D. May1 , A. Mazloum1 , M. Bouazza1 , H-layer ceramic chip ca- pacitors as integrated passive in e. g. system in package applications needs methods

Paris-Sud XI, Université de

63

Electrochemical Modeling of LMR-NMC Materials and Electrodes  

Broader source: Energy.gov (indexed) [DOE]

unit cell kinetic mean field model) that specifically accounts for the movement of ions within the crystal lattice. 5 View of Activated LMR-NMC Material The activated...

64

Validation of Material Models for Automotive Carbon Fiber Composite...  

Broader source: Energy.gov (indexed) [DOE]

Validation of Material Models for Automotive Carbon Fiber Composite Structures (VMM) Libby Berger (General Motors), Omar Faruque (Ford) Co-Principal Investigators US Automotive...

65

SUPPLEMENTARY MATERIAL Supplementary Material to "High-Dimensional Structure Learning of Ising Models  

E-Print Network [OSTI]

SUPPLEMENTARY MATERIAL Supplementary Material to "High-Dimensional Structure Learning of Ising) (P, Q) := 1 2 P - Q 1 = 1 2 xX |P(x) - Q(x)|. 1.1. Analysis of Ising Models on Trees. We first derive simple expressions for Ising models Markov on trees. This will be later used upon reduction of general

Anandkumar, Animashree

66

Modelling and characterisation of porous materials.  

E-Print Network [OSTI]

??Porous materials possessing random microstructures exist in both organic (e.g. polymer foam, bone) and in-organic (e.g. silica aerogels) forms. Foams and aerogels are two such… (more)

Alsayednoor, Jafar

2013-01-01T23:59:59.000Z

67

Fusion materials modeling: Challenges and opportunities  

E-Print Network [OSTI]

The plasma facing components, first wall, and blanket systems of future tokamak-based fusion power plants arguably represent the single greatest materials engineering challenge of all time. Indeed, the United States National ...

Wirth, B. D.

68

Severe accident modeling of a PWR core with different cladding materials  

SciTech Connect (OSTI)

The MAAP v.4 software has been used to model two severe accident scenarios in nuclear power reactors with three different materials as fuel cladding. The TMI-2 severe accident was modeled with Zircaloy-2 and SiC as clad material and a SBO accident in a Zion-like, 4-loop, Westinghouse PWR was modeled with Zircaloy-2, SiC, and 304 stainless steel as clad material. TMI-2 modeling results indicate that lower peak core temperatures, less H 2 (g) produced, and a smaller mass of molten material would result if SiC was substituted for Zircaloy-2 as cladding. SBO modeling results indicate that the calculated time to RCS rupture would increase by approximately 20 minutes if SiC was substituted for Zircaloy-2. Additionally, when an extended SBO accident (RCS creep rupture failure disabled) was modeled, significantly lower peak core temperatures, less H 2 (g) produced, and a smaller mass of molten material would be generated by substituting SiC for Zircaloy-2 or stainless steel cladding. Because the rate of SiC oxidation reaction with elevated temperature H{sub 2}O (g) was set to 0 for this work, these results should be considered preliminary. However, the benefits of SiC as a more accident tolerant clad material have been shown and additional investigation of SiC as an LWR core material are warranted, specifically investigations of the oxidation kinetics of SiC in H{sub 2}O (g) over the range of temperatures and pressures relevant to severe accidents in LWR 's. (authors)

Johnson, S. C. [Westinghouse Electric Company LLC, 5801 Bluff Road, Columbia, SC 29209 (United States); Henry, R. E.; Paik, C. Y. [Fauske and Associates, Inc., 16W070 83rd Street, Burr Ridge, IL 60527 (United States)

2012-07-01T23:59:59.000Z

69

Combining Functional Modelling and Qualitative Fault Propagation to Enable Failure Mode Analysis of  

E-Print Network [OSTI]

of Software Systems Neal Snooke and Jonathan Bell 1 Abstract. Failure Modes and Effects Analysis (FMEA- ware, and qualitative fault propagation, enables automated Software FMEA (SFMEA). The result is a broad in extending FMEA into the soft- ware itself [3, 14, 6, 8] however there has been little progress in developing

Snooke, Neal

70

Cascading Dynamics and Mitigation Assessment in Power System Disturbances via a Hidden Failure Model  

E-Print Network [OSTI]

and control strategy. The sensitivity of power-law behavior with respect to each of these parameters; Protective Relaying hidden failures; Blackout mitigation Introduction An overriding factor in power system] in spite of technological progress and huge investments on the system reliability and security. Although

71

Cascading dynamics and mitigation assessment in power system disturbances via a hidden failure model  

E-Print Network [OSTI]

and the IEEE 118-bus test system. It is our intention that this study can provide guidance on when and how system reliability; Protective relaying hidden failures; Blackout mitigation 1. Introduction and their impact on power transmission system reliability have been examined in several recent Electrical Power

Dobson, Ian

72

Mathematical model of material kinematics in an axial threshing unit  

Science Journals Connector (OSTI)

This paper presents a study of the movement of vegetal material through the threshing space of an axial threshing unit. The developed kinematical equations are based on a nonlinear law governing the non-uniform movement of the material on an uneven helical ... Keywords: Combine harvester, Computer simulation, Grain Kinematics, Grain Separation, Modeling

Petre I. Miu; Heinz-Dieter Kutzbach

2007-09-01T23:59:59.000Z

73

Prospective Life-Cycle Modeling of Novel Carbon Capture Materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Prospective Life-Cycle Modeling of Novel Carbon Capture Materials Prospective Life-Cycle Modeling of Novel Carbon Capture Materials Speaker(s): Roger Sathre Date: December 5, 2011 - 3:30pm Location: 90-4133 Seminar Host/Point of Contact: Anita Estner Barbara Adams In this presentation we describe the prospective life-cycle modeling of metal-organic frameworks (MOF), a novel type of material with the potential for efficiently capturing CO2. Life-cycle modeling of emerging technologies, conducted early in the innovation process, can generate knowledge that can feed back to inform scientific discovery and development. We discuss the challenges of credibly modeling a system that does not yet exist, and describe methodological approaches including parametric system modeling (quantifying relations between system elements), scenario projections (defining plausible pathways for system scale-up),

74

A continuum constitutive model for amorphous metallic materials  

E-Print Network [OSTI]

A finite-deformation, Coulomb-Mohr type constitutive theory for the elastic-viscoplastic response of pressure-sensitive and plastically-dilatant isotropic materials has been developed. The constitutive model has been ...

Su, Cheng, Ph. D. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

76

Atomistic modeling of nanowires, small-scale fatigue damage in cast magnesium, and materials for MEMS.  

SciTech Connect (OSTI)

Lightweight and miniaturized weapon systems are driving the use of new materials in design such as microscale materials and ultra low-density metallic materials. Reliable design of future weapon components and systems demands a thorough understanding of the deformation modes in these materials that comprise the components and a robust methodology to predict their performance during service or storage. Traditional continuum models of material deformation and failure are not easily extended to these new materials unless microstructural characteristics are included in the formulation. For example, in LIGA Ni and Al-Si thin films, the physical size is on the order of microns, a scale approaching key microstructural features. For a new potential structural material, cast Mg offers a high stiffness-to-weight ratio, but the microstructural heterogeneity at various scales requires a structure-property continuum model. Processes occurring at the nanoscale and microscale develop certain structures that drive material behavior. The objective of the work presented in this report was to understand material characteristics in relation to mechanical properties at the nanoscale and microscale in these promising new material systems. Research was conducted primarily at the University of Colorado at Boulder to employ tightly coupled experimentation and simulation to study damage at various material size scales under monotonic and cyclic loading conditions. Experimental characterization of nano/micro damage will be accomplished by novel techniques such as in-situ environmental scanning electron microscopy (ESEM), 1 MeV transmission electron microscopy (TEM), and atomic force microscopy (AFM). New simulations to support experimental efforts will include modified embedded atom method (MEAM) atomistic simulations at the nanoscale and single crystal micromechanical finite element simulations. This report summarizes the major research and development accomplishments for the LDRD project titled 'Atomistic Modeling of Nanowires, Small-scale Fatigue Damage in Cast Magnesium, and Materials for MEMS'. This project supported a strategic partnership between Sandia National Laboratories and the University of Colorado at Boulder by providing funding for the lead author, Ken Gall, and his students, while he was a member of the University of Colorado faculty.

Dunn, Martin L. (University of Colorado, Boulder, CO); Talmage, Mellisa J. (University of Colorado, Boulder, CO); McDowell, David L., 1956- (,-Georgia Institute of Technology, Atlanta, GA); West, Neil (University of Colorado, Boulder, CO); Gullett, Philip Michael (Mississippi State University , MS); Miller, David C. (University of Colorado, Boulder, CO); Spark, Kevin (University of Colorado, Boulder, CO); Diao, Jiankuai (University of Colorado, Boulder, CO); Horstemeyer, Mark F. (Mississippi State University , MS); Zimmerman, Jonathan A.; Gall, K (Georgia Institute of Technology, Atlanta, GA)

2006-10-01T23:59:59.000Z

77

A multifluid mix model with material strength effects  

SciTech Connect (OSTI)

We present a new multifluid mix model. Its features include material strength effects and pressure and temperature nonequilibrium between mixing materials. It is applicable to both interpenetration and demixing of immiscible fluids and diffusion of miscible fluids. The presented model exhibits the appropriate smooth transition in mathematical form as the mixture evolves from multiphase to molecular mixing, extending its applicability to the intermediate stages in which both types of mixing are present. Virtual mass force and momentum exchange have been generalized for heterogeneous multimaterial mixtures. The compression work has been extended so that the resulting species energy equations are consistent with the pressure force and material strength.

Chang, C. H. [Los Alamos National Laboratory; Scannapieco, A. J. [Los Alamos National Laboratory

2012-04-23T23:59:59.000Z

78

Development of a failure prediction model for heat-treated glass  

E-Print Network [OSTI]

. Lynn Beason Little heat-treated glass research has been performed to date on laterally loaded heat-treated glass plates, and nearly all published research has been empirical rather than analytic in nature. Therefore, current heat-treated glass design... VI CONCLUSION . 60 REFERENCES 62 APPENDICES Page APPENDIX A - VILD'S STATISTICAL ANALYSIS OF THE TRADITIONAL DESIGN METHOD. . . . . . . . . APPENDIX B ? SAMPLE DATA SHEET APPENDIX C - TEST SERIES I, II, AND III FAILURE LOADS CORRESPONDING TO A...

Ditsworth, Jay Morgan

1992-01-01T23:59:59.000Z

79

Material-modeling and structural-mechanics aspects  

E-Print Network [OSTI]

Material-modeling and structural-mechanics aspects of the traumatic brain injury problem M for causing traumatic brain injury. Design/methodology/approach ­ Two levels of blast peak overpressure were computational investigation of impact on a human skull/brain assembly. Keywords Brain, Injuries, Modeling

Grujicic, Mica

80

Artificial neural network model for material characterization by indentation  

Science Journals Connector (OSTI)

Analytical methods to interpret the indentation load–displacement curves are difficult to formulate and solve due to material and geometric nonlinearities as well as complex contact interactions. In this study, large strain–large deformation finite element analyses were carried out to simulate indentation experiments. An artificial neural network model was constructed for the interpretation of indentation load–displacement curves. The data from finite element analyses were used to train and validate the artificial neural network model. The artificial neural network model was able to accurately determine the material properties when presented with the load–displacement curves that were not used in the training process. The proposed artificial neural network model is robust and directly relates the characteristics of the indentation load–displacement curve to the elasto-plastic material properties.

K K Tho; S Swaddiwudhipong; Z S Liu; J Hua

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Page 1 Session 7: Material Phase Transition, Modeling, and Other  

National Nuclear Security Administration (NNSA)

7: Material Phase Transition, Modeling, and Other 7: Material Phase Transition, Modeling, and Other Thermodynamically Consistent Method for Calculation of Free Energy and Equilibrium Curves of First-Order Phase Transitions in Classical Molecular Dynamics *A.V. Karavaev andV.V. Dremov Russian Federal Nuclear Centre - Zababakhin Institute of Technical Physics, Snezhinsk, Russia State-of-the-art parallel computers allow performing MD simulations not only with substantial number of particles, but also using of complicated computationally intense many-body potentials of the interatomic interactions. One of the most important tasks for the computer-aided material science is accurate and extensive characterization of thermodynamic properties of the materials. An essential part of this characterization is the prediction of phase

82

Seismic Performance, Modeling, and Failure Assessment of Reinforced Concrete Shear Wall Buildings  

E-Print Network [OSTI]

22 Modeling of Building23 Modeling of Building1.0 GA g 2.2.7. Modeling of Building 2A The 3-D nonlinear

Tuna, Zeynep

2012-01-01T23:59:59.000Z

83

From material flow analysis to material flow management Part I: social sciences modeling approaches coupled to MFA  

Science Journals Connector (OSTI)

This paper presents social sciences modeling approaches (SSMA) that have been coupled to material flow analyses in order to support management of material flows. The presented literature review revealed that the large share of these approaches stem from economics, as these models have similar data and modeling structure than the material flow models. The discussed modeling approaches support a better system understanding and allow for estimating the potential effects of economic policies on material flows. However, it has been shown that these approaches lack important aspects of human decision-making and, thus, the designed economic measures might not always lead to the expected improvements of the material system.

Claudia R. Binder

2007-01-01T23:59:59.000Z

84

Modelling of the ultrasonic propagation in polycrystalline materials  

E-Print Network [OSTI]

. Jenson Commissariat `a l'´energie atomique, Centre de Saclay - PC120, 91191 Gif-Sur-Yvette, France lili designing new NDE methods. Modeling work has been underway at CEA-LIST in the software CIVA to describe such as a polycrystalline material. The objective is to develop new simulation tools based on metallurgical data input

Boyer, Edmond

85

Materials Modeling and Simulation for Nuclear Fuels (MMSNF) Workshops  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Aerial photo of Argonne National Laboratory Argonne National Laboratory University of Chicago Chicago Photography courtesy Thomas F Ewing Privacy and Security Notice The MMSNF Workshops The goal of the Materials Modeling and Simulation for Nuclear Fuels (MMSNF) workshops is to stimulate research and discussions on modeling and simulations of nuclear fuels, to assist the design of improved fuels and the evaluation of fuel performance. In addition to research focused on existing or improved types of LWR reactors, recent modeling programs, networks, and links have been created to develop innovative nuclear fuels and materials for future generations of nuclear reactors. Examples can be found in Europe (e.g. F-BRIDGE project and ACTINET network and SAMANTHA cooperative network), in the USA (e.g. CASL, NEAMS, CESAR and CMSN network

86

Large scale molecular dynamics modeling of materials fabrication processes  

SciTech Connect (OSTI)

An atomistic molecular dynamics model of materials fabrication processes is presented. Several material removal processes are shown to be within the domain of this simulation method. Results are presented for orthogonal cutting of copper and silicon and for crack propagation in silica glass. Both copper and silicon show ductile behavior, but the atomistic mechanisms that allow this behavior are significantly different in the two cases. The copper chip remains crystalline while the silicon chip transforms into an amorphous state. The critical stress for crack propagation in silica glass was found to be in reasonable agreement with experiment and a novel stick-slip phenomenon was observed.

Belak, J.; Glosli, J.N.; Boercker, D.B.; Stowers, I.F.

1994-02-01T23:59:59.000Z

87

Failure time in the fiber-bundle model with thermal noise and disorder Antonio Politi,1  

E-Print Network [OSTI]

that is accurately confirmed by direct simulations. The effect of the disorder is to lower the energy barrier. DOI, but this ambition contrasts with the lack of gen- eral tools capable of dealing with nonequilibrium phenom- ena heterogeneous materials can be several orders of magnitude larger than T, or, equivalently, the energy barrier

Politi, Antonio

88

Complex assembly line production simulation modeling considering robots failure and operator cycle times  

Science Journals Connector (OSTI)

This research paper demonstrates how to develop Simulation Model for a complex automotive assembly line process which consists of about 13 assembly stations, 80 robots, 6 conveyors and 7 manual operator load stations. In this paper, a simulation model ... Keywords: BIW process, DOE, production, simulation, throughput

Annamalai Pandian

2013-07-01T23:59:59.000Z

89

Evolutionary neural network modeling for forecasting the field failure data of repairable systems  

Science Journals Connector (OSTI)

An accurate product reliability prediction model can not only learn and track the product's reliability and operational performance, but also offer useful information for managers to take follow-up actions to improve the product' quality and cost. This ... Keywords: Genetic algorithms, Neural network model, Reliability prediction, Repairable system

L. Yi-Hui

2007-11-01T23:59:59.000Z

90

Arctic sea ice modeling with the material-point method.  

SciTech Connect (OSTI)

Arctic sea ice plays an important role in global climate by reflecting solar radiation and insulating the ocean from the atmosphere. Due to feedback effects, the Arctic sea ice cover is changing rapidly. To accurately model this change, high-resolution calculations must incorporate: (1) annual cycle of growth and melt due to radiative forcing; (2) mechanical deformation due to surface winds, ocean currents and Coriolis forces; and (3) localized effects of leads and ridges. We have demonstrated a new mathematical algorithm for solving the sea ice governing equations using the material-point method with an elastic-decohesive constitutive model. An initial comparison with the LANL CICE code indicates that the ice edge is sharper using Materials-Point Method (MPM), but that many of the overall features are similar.

Peterson, Kara J.; Bochev, Pavel Blagoveston

2010-04-01T23:59:59.000Z

91

Modeling shear failure and permeability enhancement due to coupled Thermal-Hydrological-Mechanical processes in Enhanced Geothermal Reservoirs  

SciTech Connect (OSTI)

The connectivity and accessible surface area of flowing fractures, whether natural or man-made, is possibly the single most important factor, after temperature, which determines the feasibility of an Enhanced Geothermal System (EGS). Rock deformation and in-situ stress changes induced by injected fluids can lead to shear failure on preexisting fractures which can generate microseismic events, and also enhance the permeability and accessible surface area of the geothermal formation. Hence, the ability to accurately model the coupled thermal-hydrologic-mechanical (THM) processes in fractured geological formations is critical in effective EGS reservoir development and management strategies. The locations of the microseismic events can serve as indicators of the zones of enhanced permeability, thus providing vital information for verification of the coupled THM models. We will describe a general purpose computational code, FEHM, developed for this purpose, that models coupled THM processes during multiphase fluid flow and transport in fractured porous media. The code incorporates several models of fracture aperture and stress behavior combined with permeability relationships. We provide field scale examples of applications to geothermal systems to demonstrate the utility of the method.

Kelkar, Sharad [Los Alamos National Laboratory

2011-01-01T23:59:59.000Z

92

Model-based Failure Modes and Effects Analysis of Neal Snooke 1  

E-Print Network [OSTI]

embedded software developers who are already familiar with the benefits of FMEA analysis. Several au- thors discuss experiences of performing manual FMEA of software however there has been no attempt at automating of software and the success of model based automated FMEA for hardware. 1 Introduction The notion of Software

Snooke, Neal

93

Modeling Creep-Fatigue-Environment Interactions in Steam Turbine Rotor Materials for Advanced Ultra-supercritical Coal Power Plants  

SciTech Connect (OSTI)

The goal of this project is to model creep-fatigue-environment interactions in steam turbine rotor materials for advanced ultra-supercritical (A-USC) coal power Alloy 282 plants, to develop and demonstrate computational algorithms for alloy property predictions, and to determine and model key mechanisms that contribute to the damages caused by creep-fatigue-environment interactions. The nickel based Alloy 282 is selected for this project because it is one of the leading candidate materials for the high temperature/pressure section of an A-USC steam turbine. The methods developed in the project are expected to be applicable to other metal alloys in similar steam/oxidation environments. The major developments are: ? failure mechanism and microstructural characterization ? atomistic and first principles modeling of crack tip oxygen embrittlement ? modeling of gamma prime microstructures and mesoscale microstructure-defect interactions ? microstructure and damage-based creep prediction ? multi-scale crack growth modeling considering oxidation, viscoplasticity and fatigue The technology developed in this project is expected to enable more accurate prediction of long service life of advanced alloys for A-USC power plants, and provide faster and more effective materials design, development, and implementation than current state-of-the-art computational and experimental methods. This document is a final technical report for the project, covering efforts conducted from January 2011 to January 2014.

Shen, Chen

2014-01-20T23:59:59.000Z

94

Lattice Boltzmann model for photonic band gap materials  

Science Journals Connector (OSTI)

An efficient technique for computing photonic band structure and defect modes is proposed based on the lattice Boltzmann model. Physically, it is a scheme based on the kinetics of the virtual microscopic process, rather than a solution of the macroscopic Maxwell equations. The method has significant advantages of being naturally suited for massively parallel machine, as well as speed and convenience, providing another methodology for photonic band gap materials and, also, for general electromagnetic scattering problems in open region when incorporated with the perfectly matched layer technique.

Zhifang Lin; Haiping Fang; Jianjun Xu; Jian Zi; Xiangdong Zhang

2003-02-07T23:59:59.000Z

95

Modelling challenges for battery materials and electrical energy storage  

Science Journals Connector (OSTI)

Many vital requirements in world-wide energy production, from the electrification of transportation to better utilization of renewable energy production, depend on developing economical, reliable batteries with improved performance characteristics. Batteries reduce the need for gasoline and liquid hydrocarbons in an electrified transportation fleet, but need to be lighter, longer-lived and have higher energy densities, without sacrificing safety. Lighter and higher-capacity batteries make portable electronics more convenient. Less expensive electrical storage accelerates the introduction of renewable energy to electrical grids by buffering intermittent generation from solar or wind. Meeting these needs will probably require dramatic changes in the materials and chemistry used by batteries for electrical energy storage. New simulation capabilities, in both methods and computational resources, promise to fundamentally accelerate and advance the development of improved materials for electric energy storage. To fulfil this promise significant challenges remain, both in accurate simulations at various relevant length scales and in the integration of relevant information across multiple length scales. This focus section of Modelling and Simulation in Materials Science and Engineering surveys the challenges of modelling for energy storage, describes recent successes, identifies remaining challenges, considers various approaches to surmount these challenges and discusses the potential of these methods for future battery development. Zhang et al begin with atoms and electrons, with a review of first-principles studies of the lithiation of silicon electrodes, and then Fan et al examine the development and use of interatomic potentials to the study the mechanical properties of lithiated silicon in larger atomistic simulations. Marrocchelli et al study ionic conduction, an important aspect of lithium-ion battery performance, simulated by molecular dynamics. Emerging high-throughput methods allow rapid screening of promising new candidates for battery materials, illustrated for Li-ion olivine phosphates by Hajiyani et al . This collection includes descriptions of new techniques to model the chemistry at an electrode–electrolyte interface; Gunceler et al demonstrate coupling an electronic description of the electrode chemistry with the fluid electrolyte in a joint density functional theory method. Bridging to longer length scales to probe mechanical properties and transport, Preiss et al present a proof-of-concept phase field approach for a permeation model at an electrochemical interface, An and Jiang examine finite element simulations for transient deformation and transport in electrodes, and Haftabaradaran et al study the application of an analytical model to investigate the critical thickness for fracture in thick film electrodes. The focus section concludes with a study by Chung et al which combines modelling and experiment, examining the validity of the Bruggeman relation for porous electrodes. All of the papers were peer-reviewed following the standard procedure established by the Editorial Board of Modelling and Simulation in Materials Science and Engineering .

Richard P Muller; Peter A Schultz

2013-01-01T23:59:59.000Z

96

DOE Hydrogen Analysis Repository: Investigating Failure in  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Investigating Failure in Polymer-Electrolyte Fuel Cells Investigating Failure in Polymer-Electrolyte Fuel Cells Project Summary Full Title: Investigating Failure in Polymer-Electrolyte Fuel Cells Project ID: 175 Principal Investigator: John Newman Brief Description: The goal of this project is to understand and mitigate fuel cell failure mechanisms. Keywords: Fuel cell, modeling Purpose This project is conducting fundamental studies of fuel cell failure mechanisms. This includes experiments aimed at meeting the DOE operation and survivability targets at low and subzero temperatures, as well as development of mathematical models and fundamental experiments to improve performance and design against failure phenomena. Performer Principal Investigator: John Newman Organization: Lawrence Berkeley National Laboratory (LBNL)

97

Report for the ASC CSSE L2 Milestone (4873) - Demonstration of Local Failure Local Recovery Resilient Programming Model.  

SciTech Connect (OSTI)

Recovery from process loss during the execution of a distributed memory parallel application is presently achieved by restarting the program, typically from a checkpoint file. Future computer system trends indicate that the size of data to checkpoint, the lack of improvement in parallel file system performance and the increase in process failure rates will lead to situations where checkpoint restart becomes infeasible. In this report we describe and prototype the use of a new application level resilient computing model that manages persistent storage of local state for each process such that, if a process fails, recovery can be performed locally without requiring access to a global checkpoint file. LFLR provides application developers with an ability to recover locally and continue application execution when a process is lost. This report discusses what features are required from the hardware, OS and runtime layers, and what approaches application developers might use in the design of future codes, including a demonstration of LFLR-enabled MiniFE code from the Matenvo mini-application suite.

Heroux, Michael A.; Teranishi, Keita [Sandia National Laboratories, Livermore, CA

2014-06-01T23:59:59.000Z

98

Materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2 MAG LAB REPORTS Volume 18 No. 1 CONDENSED MATTER SCIENCE Technique development, graphene, magnetism & magnetic materials, topological insulators, quantum fl uids & solids,...

99

Micromechanical Modeling of Multiphysical Behavior of Smart Materials Using the Variational  

E-Print Network [OSTI]

Micromechanical Modeling of Multiphysical Behavior of Smart Materials Using the Variational to predict the effective properties as well as the local fields of periodic smart materials responsive modeling scheme. To treat general microstructure of smart materials, we implemented this model using

Yu, Wenbin

100

Stochastic Simulation Model for the 3D Morphology of Composite Materials in Li-Ion Batteries  

E-Print Network [OSTI]

Stochastic Simulation Model for the 3D Morphology of Composite Materials in Li-Ion Batteries Ralf of composite materials used in Li-ion batteries. In this paper, we develop a stochastic simulation model in 3D, Stochastic Simulation Model, Structural Analysis, Marked Point Process, Germ-Grain Model, Model Fitting

Schmidt, Volker

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Deformation and failure of zircaloy fuel sheaths under LOCA conditions  

SciTech Connect (OSTI)

A unified, microstructural creep law which simulates the transient creep deformation of Zircaloy at temperatures above 750 K has been used to follow the interaction of diffusional and dislocation creep with changes in material microstructure (grain size, recrystallization, phase fraction and anisotropy) under loss-of-coolant accident (LOCA) conditions. Comparison of a membrane sheath model using this creep law with a large number of tube tests (>700) in an inert environment had demonstrated good predictive capability. This model has been extended to cover other aspects affecting deformation deformation and failure of CANDU fuel sheaths such as: nonuniform structure distribution resulting from temperature profiles along the sheath length, oxidation of the fuel sheaths, cracking of the oxidized layers and localized straining, large strain failure, and failure by beryllium-assisted cracking. 13 figures, 26 references.

Sagat, S.; Sills, H.E.; Walsworth, J.A.

1984-01-01T23:59:59.000Z

102

Materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Materials Materials and methods are available as supplementary materials on Science Online. 16. W. Benz, A. G. W. Cameron, H. J. Melosh, Icarus 81, 113 (1989). 17. S. L. Thompson, H. S. Lauson, Technical Rep. SC-RR-710714, Sandia Nat. Labs (1972). 18. H. J. Melosh, Meteorit. Planet. Sci. 42, 2079 (2007). 19. S. Ida, R. M. Canup, G. R. Stewart, Nature 389, 353 (1997). 20. E. Kokubo, J. Makino, S. Ida, Icarus 148, 419 (2000). 21. M. M. M. Meier, A. Reufer, W. Benz, R. Wieler, Annual Meeting of the Meteoritical Society LXXIV, abstr. 5039 (2011). 22. C. B. Agnor, R. M. Canup, H. F. Levison, Icarus 142, 219 (1999). 23. D. P. O'Brien, A. Morbidelli, H. F. Levison, Icarus 184, 39 (2006). 24. R. M. Canup, Science 307, 546 (2005). 25. J. J. Salmon, R. M. Canup, Lunar Planet. Sci. XLIII, 2540 (2012). Acknowledgments: SPH simulation data are contained in tables S2 to S5 of the supplementary materials. Financial support

103

Waste Form Degradation Model Integration for Engineered Materials Performance  

Broader source: Energy.gov [DOE]

The collaborative approach to the glass and metallic waste form degradation modeling activities includes process model development (including first-principles approaches) and model integration—both...

104

Theory and Modeling of Weakly Bound/Physisorbed Materials for Hydrogen Storage  

Broader source: Energy.gov [DOE]

Presentation on the Theory and Modeling of Weakly Bound/Physisorbed Materials for Hydrogen Storage given at the DOE Theory Focus Session on Hydrogen Storage Materials on May 18, 2006.

105

Evaluation of the numerical stability and sensitivity to material parameter variations for several unified constitutive models  

E-Print Network [OSTI]

Material Constants Used In Bodner's Model For Hastelloy-X at 1800' F . Naterial Constants Used In Walker's Model For Hastelloy-X at 1800' F . Material Constants Used In Krieg's Model For Hastelloy-X at 1800 F . Material Constants Used In Miller...'s Model For Hastelloy-X at 1800' F . Page 18 26 30 35 LIST OF FIGURES Fi gure Plots Used to Obtain Material Parameters For Bodner's Model . Page T6 Back Stress and True Stress-Strain Curve Used in Walker's Theory. Plot Used to Determine...

Imbrie, Peter Kenneth

1985-01-01T23:59:59.000Z

106

Fire Retardant Polymer Nanocomposites: Materials Design and Thermal Degradation Modeling.  

E-Print Network [OSTI]

??Compared to conventional materials, polymer matrix composites (PMCs) have a number of attractive properties, including light weight, easiness of installation, potential to lower system-level cost,… (more)

Zhuge, Jinfeng

2012-01-01T23:59:59.000Z

107

Fundamentals of Failure Analysis  

Science Journals Connector (OSTI)

Optical microscopes are fundamental to any failure analysis laboratory being easy ... to use and understand. However, most professional electronic component failure analysis laboratories employ more specialised ....

2003-01-01T23:59:59.000Z

108

Nanotechnology Nanotechnology comprises measurement, design, modeling and fabrication of materials and systems at the atomic scale.  

E-Print Network [OSTI]

Nanotechnology Nanotechnology comprises measurement, design, modeling and fabrication of materials are able to customize their education by specializing in areas such as nanotechnology, computational

Glowinski, Roland

109

Identification of material parameters for continuum modeling of phase transformations in multicomponent systems  

E-Print Network [OSTI]

Identification of material parameters for continuum modeling of phase transformations called order pa- rameters, which take on specified values in the bulk phases. If the transformation

Umantsev, Alexander

110

TAMCN: a tool for aggregate modeling of civil nuclear materials  

E-Print Network [OSTI]

involved in the creation, storage, and utilization of potentially destructive nuclear material. Western Europe and Japan, namely France, Belgium, the United Kingdom, Germany, Switzerland, and Japan, were chosen as a starting point because the issues...

Watson, Aaron Michael

2002-01-01T23:59:59.000Z

111

Mathematical and computational models of incompressible materials subject to shear  

Science Journals Connector (OSTI)

......used simple shear to characterize the mechanical properties of brain tissue, and Horgan & Murphy (2011) used it to analyse materials...Gilchrist, M. D. (2013) Mechanical characterization of brain tissue in simple shear at dynamic strain rates. J. Mech......

J. H. Adler; L. Dorfmann; D. Han; S. MacLachlan; C. Paetsch

2014-10-01T23:59:59.000Z

112

Recent atomistic modelling studies of energy materials: batteries included  

Science Journals Connector (OSTI)

...in functional materials for energy conversion and storage technologies...addressing the global challenge of green sustainable energy. This article aims to demonstrate...addressing the global challenge of green sustainable energy. This article aims to demonstrate...

2010-01-01T23:59:59.000Z

113

Light water reactor lower head failure analysis  

SciTech Connect (OSTI)

This document presents the results from a US Nuclear Regulatory Commission-sponsored research program to investigate the mode and timing of vessel lower head failure. Major objectives of the analysis were to identify plausible failure mechanisms and to develop a method for determining which failure mode would occur first in different light water reactor designs and accident conditions. Failure mechanisms, such as tube ejection, tube rupture, global vessel failure, and localized vessel creep rupture, were studied. Newly developed models and existing models were applied to predict which failure mechanism would occur first in various severe accident scenarios. So that a broader range of conditions could be considered simultaneously, calculations relied heavily on models with closed-form or simplified numerical solution techniques. Finite element techniques-were employed for analytical model verification and examining more detailed phenomena. High-temperature creep and tensile data were obtained for predicting vessel and penetration structural response.

Rempe, J.L.; Chavez, S.A.; Thinnes, G.L. [EG and G Idaho, Inc., Idaho Falls, ID (United States)] [and others

1993-10-01T23:59:59.000Z

114

A review of macroscopic ductile failure criteria.  

SciTech Connect (OSTI)

The objective of this work was to describe several of the ductile failure criteria com- monly used to solve practical problems. The following failure models were considered: equivalent plastic strain, equivalent plastic strain in tension, maximum shear, Mohr- Coulomb, Wellman's tearing parameter, Johnson-Cook and BCJ MEM. The document presents the main characteristics of each failure model as well as sample failure predic- tions for simple proportional loading stress histories in three dimensions and in plane stress. Plasticity calculations prior to failure were conducted with a simple, linear hardening, J2 plasticity model. The resulting failure envelopes were plotted in prin- cipal stress space and plastic strain space, where the dependence on stress triaxiality and Lode angle are clearly visible. This information may help analysts select a ductile fracture model for a practical problem and help interpret analysis results.

Corona, Edmundo; Reedlunn, Benjamin

2013-09-01T23:59:59.000Z

115

Solar Thermal Reactor Materials Characterization  

SciTech Connect (OSTI)

Current research into hydrogen production through high temperature metal oxide water splitting cycles has created a need for robust high temperature materials. Such cycles are further enhanced by the use of concentrated solar energy as a power source. However, samples subjected to concentrated solar radiation exhibited lifetimes much shorter than expected. Characterization of the power and flux distributions representative of the High Flux Solar Furnace(HFSF) at the National Renewable Energy Laboratory(NREL) were compared to ray trace modeling of the facility. In addition, samples of candidate reactor materials were thermally cycled at the HFSF and tensile failure testing was performed to quantify material degradation. Thermal cycling tests have been completed on super alloy Haynes 214 samples and results indicate that maximum temperature plays a significant role in reduction of strength. The number of cycles was too small to establish long term failure trends for this material due to the high ductility of the material.

Lichty, P. R.; Scott, A. M.; Perkins, C. M.; Bingham, C.; Weimer, A. W.

2008-03-01T23:59:59.000Z

116

Cu-Bi as a Model System For Liquid Phase Sintered Thermal Interface Management Materials  

E-Print Network [OSTI]

relates electrical resistivity to thermal conductivity for materials where electrons are principleCu-Bi as a Model System For Liquid Phase Sintered Thermal Interface Management Materials P to produce composite materials. A high melting phase (HMP) and low melting phase (LMP) are mixed

Collins, Gary S.

117

Computationally efficient algorithms for modelling thermal degradation and spiking phenomena in polymeric materials  

E-Print Network [OSTI]

resistance are the key factors that determine a wide spread success of these materials (Flipsen et al., 1996 in polymeric materials R.V.N. Melnik * Faculty of Science and Engineering, Mads Clausen Institute, University are interested in one such problem, namely in the modelling of curing dynamics of polymeric materials

Melnik, Roderick

118

Modeling - Scale-Bridging Simulations Active Materials in Li...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

& Publications Microscale Electrode Design Using Coupled Kinetic, Thermal and Mechanical Modeling Overview of the Batteries for Advanced Transportation Technologies (BATT)...

119

Modifications in the AA5083 Johnson-Cook Material Model for Use in Friction Stir Welding  

E-Print Network [OSTI]

Modifications in the AA5083 Johnson-Cook Material Model for Use in Friction Stir Welding- turing processes involving plastic deformation of metallic materials. The main attraction to this model (e.g., those associated with the influence of plastic deformation, rate of deformation

Grujicic, Mica

120

Wear 252 (2002) 322331 A physically-based abrasive wear model for composite materials  

E-Print Network [OSTI]

Wear 252 (2002) 322­331 A physically-based abrasive wear model for composite materials Gun Y. Leea 2001 Abstract A simple physically-based model for the abrasive wear of composite materials is presented based on the mechanics and mechanisms associated with sliding wear in soft (ductile)- matrix composites

Ritchie, Robert

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Phenomenological modelling of viscoplasticity Mechanics of Materials Laboratory, Rensselaer Polytechnic Institute, Troy, NY 12180-3590,  

E-Print Network [OSTI]

331 Phenomenological modelling of viscoplasticity E. Krempl Mechanics of Materials Laboratory. - The essentials of phenomenological modeling of metal deformation behavior at small strain are introduced together interpreted from a materials science viewpoint are re-analyzed from a phenomenological point of view

Paris-Sud XI, Université de

122

Divergence Form Equations Arising in Models For Inhomogeneous Materials  

E-Print Network [OSTI]

first assumption it should be noted that there will be no phase change in the material. Indeed the first assumption will be false if the change in temperature causes a change in phase in this case. There will be a jump discontinuity in the energy at the temperature where the phase change occurs, and the size

Blank, Ivan

123

Multi-length scale computational derivation of Kevlar material model  

E-Print Network [OSTI]

in various protective systems whose main requirement is a high level of penetration resistance against high kinetic energy projectiles (e.g., bullets, mine, IED, or turbine fragments, etc.). Their high mass-efficiency (i.e., mass normalized performance) makes these materials and structures particularly suitable

Grujicic, Mica

124

Lifetime and failure strain prediction for material subjected to non-stationary tensile loading conditions: applications to Zircaloy - 4. [Monkman-Grant relationship  

SciTech Connect (OSTI)

The life fraction rule (LFR) is used to calculate the lifetime of materials subjected to stress and temperature ramp loading. The solutions for the individual nonstationary temperature and stress loading conditions can be applied to predict also the lifetime of structures loaded by superimposed ramps solely on the basis of normal 'iso'-stress rupture data. The concept is applied to tensional stress and temperature cycling as well. As compared with the peculiarities of the problem, the agreement between experiments and calculations is encouraging. 16 refs.

Bocek, M.

1982-01-01T23:59:59.000Z

125

Abstract--The analysis of follow-up data from patients suffering from heart failure is a difficult task, due to the complex and multifactorial nature of this pathology. In this paper, we present a coupled model, integrating a pulsatile heart into a model  

E-Print Network [OSTI]

1 Abstract--The analysis of follow-up data from patients suffering from heart failure a coupled model, integrating a pulsatile heart into a model of the short to long-term regulations decompensated heart failure episode on a patient undergoing cardiac resynchronization therapy. Index Terms

Paris-Sud XI, Université de

126

Mathematical modeling of irreversible dynamic deformation, micro- and macrofracture of materials and structures  

National Nuclear Security Administration (NNSA)

7: Material Phase Transition, Modeling, and Others 7: Material Phase Transition, Modeling, and Others Mathematical Modeling of Irreversible Dynamic Deformation, Micro- and Macrofracture of Materials and Structures P. P. Zakharov and A. B. Kiselev All-Russia Research Institute of Automatics, Moscow 125412, Russia Thermomechanical processes, which proceed in deformable solids under intensive dynamic loading, consist of mechanical, thermal and structural ones, which correlate themselves. The structural processes involve the formation, motion and interaction of defects in metallic crystals, phase transitions, the breaking of bonds between molecules in polymers, the accumulation of microstructural damages (pores, cracks), etc. Irreversible deformations, zones of adiabatic shear and microfractures are caused by these

127

An enhanced Lemaitre model formulation for materials processing damage computation  

E-Print Network [OSTI]

are presented and discussed to deal with complex multiaxial configurations ­ such as multi-stages bulk forming loading, involving crack closure effects. - Simple parameters identification: whatever the damage model used, the identification of damage parameters is an important issue. Most of the time

Boyer, Edmond

128

Utilization of Smart Materials and Predictive Modeling to Integrate Intracellular Dynamics with Cell Biomechanics and Collective Tissue Behavior  

E-Print Network [OSTI]

Utilization of Smart Materials and Predictive Modeling to Integrate Intracellular Dynamics important structures inside cells. New "smart" material will be used to trigger changes to cell movement Medical University Control of Cell Polarization by Smart Material Substrates Multiscale Imaging Multiscale

Mather, Patrick T.

129

NONLINEAR ANALYSIS OF RUBBER-BASED POLYMERIC MATERIALS WITH THERMAL RELAXATION MODELS  

E-Print Network [OSTI]

NONLINEAR ANALYSIS OF RUBBER-BASED POLYMERIC MATERIALS WITH THERMAL RELAXATION MODELS R. V. N of the material and their close connection with the effect of thermal relaxation time can be best appreciated (phonons). A relaxation time appears naturally as the characteristic of thermal resistance in the solid

Melnik, Roderick

130

Modeling a solar energy collector with an integrated phase-change material  

E-Print Network [OSTI]

In this thesis, a finite-element computer model was created to simulate a solar air heater with an integrated-phase change material. The commercially available finite element package ADINA-Fluid was used to generate the ...

Guerra, Alexander Adrian

2009-01-01T23:59:59.000Z

131

Modeling a solar energy collector with an integrated phase-change material .  

E-Print Network [OSTI]

??In this thesis, a finite-element computer model was created to simulate a solar air heater with an integrated-phase change material. The commercially available finite element… (more)

Guerra, Alexander Adrian

2009-01-01T23:59:59.000Z

132

Vehicle Technologies Office Merit Review 2014: Validation of Material Models for Automotive Carbon Fiber Composite Structures  

Broader source: Energy.gov [DOE]

Presentation given by General Motors at 2014 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about validation of material models...

133

Development and numerical implementation of nonlinear viscoelastic-viscoplastic model for asphalt materials  

E-Print Network [OSTI]

pavements is illustrated using finite element simulations. The constitutive model developed in this study can describe the behavior of asphalt materials (asphalt binder, asphalt mastic and mixtures) under various testing conditions. This study also achieved...

Huang, Chien-Wei

2009-05-15T23:59:59.000Z

134

FLUID FLOW MODELING OF RESIN TRANSFER MOLDING FOR COMPOSITE MATERIAL WIND TURBINE BLADE STRUCTURES  

E-Print Network [OSTI]

FLUID FLOW MODELING OF RESIN TRANSFER MOLDING FOR COMPOSITE MATERIAL WIND TURBINE BLADE STRUCTURES the guidance and direction provided by my advisors: Dr. Mandell, Dr. Cairns and Dr. Larsen. I would also like

135

Consideration of common cause failures in safety systems  

Science Journals Connector (OSTI)

Systems in which failure could endanger human life are termed safety-critical. The SIS (Safety Instrumented System) should be designed to meet the required safety integrity level as defined in the safety requirement specification. Moreover, the SIS design ... Keywords: IEC 61508, beta-factor-model, common cause failure, multi parameter model, probability of failure on demand

J. Börcsök; P. Holub

2008-04-01T23:59:59.000Z

136

Object-oriented process modeling for material-at-risk estimation.  

SciTech Connect (OSTI)

Nuclear analytical chemistry/materials characterization operations at Los Alamos support many programs related to national security. These operations work with a wide range of material masses (microgram to tens of grams) and several forms (metal, oxide, and liquid). We have used detailed flowsheets for the chemistry and characterization functions to construct a process model of the facility operations. The model, constructed with the commercially available package ExtendTMt,r acks material amounts and forms through the process of sample receiving through data return. The model calculates equipment utilization, throughput, and turnaroundtime, as well as the material-at-risk and source term as a function of time for facility safety analyses. We see that the source-term is highly dependent on the material holding time, as expected; thus, proper material management policies are essential to operating a facility within regulatory guidelines regarding material-at-risk. In addition, we see that segregation of operations based on the material used can be beneficial to the overall operations.

Kornreich, D. E. (Drew E.); Farman, Richard F.

2002-01-01T23:59:59.000Z

137

Predictive Models of Biohydrogen and Biomethane Production Based on the Compositional and Structural Features of Lignocellulosic Materials  

Science Journals Connector (OSTI)

Predictive Models of Biohydrogen and Biomethane Production Based on the Compositional and Structural Features of Lignocellulosic Materials ...

Florian Monlau; Cecilia Sambusiti; Abdellatif Barakat; Xin Mei Guo; Eric Latrille; Eric Trably; Jean-Philippe Steyer; Hélène Carrere

2012-10-10T23:59:59.000Z

138

Generic tool for modelling and simulation of semiconductor intrabay material handling system  

Science Journals Connector (OSTI)

Semiconductor manufacturing facilities are migrating to 300 mm technology, necessitating the implementation of automated material handling systems (AMHS) for a variety of ergonomic and safety considerations. A predictive tool, such as software simulation, is needed at the planning stage to estimate the performance of these relatively new systems. Two forms of AMHS are in general use in industry one which handles material within a group of machines (a bay) and one which transfers material between bays. This paper presents a generic tool for modelling and simulation of an intrabay AMHS. The model utilises a library of different blocks representing the different components of any intrabay material handling system, providing a tool that allows rapid building and analysis of an AMHS under different operating conditions. The ease of use of the system means that inexpert users have the ability to generate good models.

K.S. El-Kilany; P. Young; M.A. El Baradie

2004-01-01T23:59:59.000Z

139

Constitutive modeling of void shearing effect in ductile fracture of porous materials  

E-Print Network [OSTI]

* Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 5 to describe plastic deformation for such type of materials. It has attracted a great deal of attention and various modifications to this model have been proposed. The constitutive equations of Gur- son-like model

Xue, Liang

140

Modeling of quasistatic and dynamic load responses of filled viscoelastic materials  

E-Print Network [OSTI]

are typically used for static finite element analysis (see [9]). The CRSC/Lord team worked, both theoreticallyModeling of quasi­static and dynamic load responses of filled viscoelastic materials H.T. Banks factors to the complications arising in the process of formulating models. Damping is highly complex

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Contemporary heart failure management.  

E-Print Network [OSTI]

??The research presented within this thesis aims to add to the current knowledge regarding contemporary heart failure (HF) management. Chapter 2 describes a study collating… (more)

Wasywich, Cara Anne

2009-01-01T23:59:59.000Z

142

Atomistic modeling of diffusion coefficient in fusion reactor first wall material tungsten  

Science Journals Connector (OSTI)

Abstract Tungsten is remarkable for its robustness, especially it has the highest melting point of all the non–alloyed metals. Metallic material tungsten and tungsten alloys have been widely used in aerospace, weapon, nuclear industries and fusion reactor. Tungsten is expected to be the fusion reactor first wall material for this reason. In this paper, self-diffusion coefficients of metallic material tungsten have been investigated via molecular dynamics simulation method using the modified embedded atom potential model. Diffusion activation energy of tungsten can be gotten according to Arrhenius relation between the self-diffusion coefficients simulation results and temperatures. The dipole interaction model is introduced to analyze metallic material tungsten self-diffusion process in a uniform magnetic field. The strong magnetic field increases diffusion activation energy by 34.52% and limits self-diffusion coefficient by 1.15% in 2 T uniform magnetic field.

Zenghui Wang; Kaixuan Zhao; Weiming Chen; Xiaodi Chen; Longyan Zhang

2014-01-01T23:59:59.000Z

143

NETL: Advanced Research - Materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

High Performance Materials > Chrome Oxide Refractory High Performance Materials > Chrome Oxide Refractory Advanced Research High Performance Materials Chrome Oxide Refractory One notable NETL success is the development of a chrome oxide refractory material capable of working in slagging gasifier conditions. In this project, researchers first determined that one of the major failure mechanisms for chrome oxide refractories exposed to the intense heat and corrosive environment was spalling, or the chipping or flaking of refractory material from an exposed face. They used this information to formulate a high-chrome oxide refractory composition that resists spalling, resulting in a refractory with a longer service life in the gasifier. Inside an ultrasupercritical (USC) pulverized coal power plant, materials are exposed to temperatures up to 760°C and pressures up to 5,000 psi. Operating a USC system can improve power plant efficiency up to 47% and reduce emissions. However, finding boiler and turbine materials that can hold up under extreme conditions requires new high-temperature metal alloys and ceramic coatings, as well as computational modeling research to optimize the processing of these materials. Advanced Research Materials Development program successes in this area include the following:

144

Modeling of nonlinear optic and ESR response of CDW MX materials  

SciTech Connect (OSTI)

We report results on the nonlinear optic and ESR response of the PtX MX chain materials calculated using a discrete, 3/4-filled, two-band, tight-binding Peierls-Hubbard model. We calculated electroabsorption (EA) spectra for the three PtX (X=Cl, Br, 1) charge-density-wave (CDW) materials and find good agreement with the experimental data. We also obtain EA spectra for localized defects in PtBr. In addition, the field orientation dependence of the electron spin resonance spectra associated with the spin carrying defects is calculated for PtX materials and compared with ESR data on photoinduced defects.

Saxena, A.; Gammel, J.T.; Bishop, A.R. [Los Alamos National Lab., NM (United States); Shuai, Z.; Bredas, J.L. [Center de Recherche en Electronique et Photonique Moleculaires, Universite de Mons-Hainaut (Belgium); Batistic, I. [Zagreb Univ. (Croatia). Dept. of Physics; Alouani, M. [Ohio State Univ., Columbus, OH (United States). Dept. of Physics

1994-09-01T23:59:59.000Z

145

Transient Heat and Material Flow Modeling of Friction Stir Processing of Magnesium Alloy using Threaded Tool  

SciTech Connect (OSTI)

A three-dimensional transient computational fluid dynamics (CFD) model was developed to investigate the material flow and heat transfer during friction stir processing (FSP) in an AZ31B magnesium alloy. The material was assumed to be a non-Newtonian viscoplastic fluid, and the Zener-Hollomon parameter was used to describe the dependence of material viscosity on temperature and strain rate. The material constants used in the constitutive equation were determined experimentally from compression tests of the AZ31B Mg alloy under a wide range of strain rates and temperatures. A dynamic mesh method, combining both Lagrangian and Eulerian formulations, was used to capture the material flow induced by the movement of the threaded tool pin. Massless inert particles were embedded in the simulation domain to track the detailed history of material flow. The actual FSP was also carried out on a wrought Mg plate where temperature profiles were recorded by embedding thermocouples. The predicted transient temperature history was found to be consistent with that measured during FSP. Finally, the influence of the thread on the simulated results of thermal history and material flow was studied by comparing two models: one with threaded pin and the other with smooth pin surface.

Yu, Zhenzhen [ORNL; Zhang, Wei [ORNL; Choo, Hahn [ORNL; Feng, Zhili [ORNL

2012-01-01T23:59:59.000Z

146

Summary of "Materials Modeling and Simulations for Nuclear Fuels"  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary of "Materials Modeling and Simulations for Nuclear Fuels" Summary of "Materials Modeling and Simulations for Nuclear Fuels" (MMSNF 2013) workshop Director's Welcome Organization Achievements Highlights Fact Sheets, Brochures & Other Documents Multimedia Library About Nuclear Energy Nuclear Reactors Designed by Argonne Argonne's Nuclear Science and Technology Legacy Opportunities within NE Division Visit Argonne Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Celebrating the 70th Anniversary of Chicago Pile 1 (CP-1) Argonne OutLoud on Nuclear Energy Argonne Energy Showcase 2012 Highlights Bookmark and Share "Materials Modeling and Simulations for Nuclear Fuels" (MMSNF 2013) workshop Workshop Summary Presentation during MMSNF Workshop in Chicago

147

Model simulation and experiments of flow and mass transport through a nano-material gas filter  

SciTech Connect (OSTI)

A computational model for evaluating the performance of nano-material packed-bed filters was developed. The porous effects of the momentum and mass transport within the filter bed were simulated. For the momentum transport, an extended Ergun-type model was employed and the energy loss (pressure drop) along the packed-bed was simulated and compared with measurement. For the mass transport, a bulk dsorption model was developed to study the adsorption process (breakthrough behavior). Various types of porous materials and gas flows were tested in the filter system where the mathematical models used in the porous substrate were implemented and validated by comparing with experimental data and analytical solutions under similar conditions. Good agreements were obtained between experiments and model predictions.

Yang, Xiaofan; Zheng, Zhongquan C.; Winecki, Slawomir; Eckels, Steve

2013-11-01T23:59:59.000Z

148

Erosion-corrosion modelling of gas turbine materials for coal-fired combined cycle power generation  

Science Journals Connector (OSTI)

The development of coal-fired combined cycle power generation systems is receiving considerable worldwide interest. The successful development and commercialisation of these new systems require that all the component parts are manufactured from appropriate materials and that these materials give predictable in-service performance. Corrosion and erosion-corrosion, resulting from coal derived particulates, deposition and gaseous species, have been identified as potential life limiting factors for these systems. Models to predict these modes of materials degradation are under active development. This paper outlines the development and testing of models suitable for use in gas turbine environments. The complexity of the corrosion processes means that an empirical approach to model development is required whereas a more mechanistic approach can be applied to erosion processes. For hot corrosion conditions, statistically based corrosion models have been produced using laboratory tests for two coatings and a base alloy at typical type I and type II hot corrosion temperatures (900 and 700°C). These models use the parameters of alkali sulphate deposition flux and \\{SOx\\} partial pressure (at each temperature and for set \\{HCl\\} partial pressures), to predict the rate of the most likely localised damage associated with hot corrosion reactions. For erosion-corrosion modelling, a series of laboratory tests have been carried out to investigate erosion behaviour in corrosive conditions appropriate to coal-fired gas turbines. Materials performance data have been obtained from samples located in the hot gas path of the Grimethorpe PFBC pilot plant, under well characterised conditions, for testing the corrosion and erosion-corrosion models. The models successfully predict the materials damage observed in the pilot plant environments.

N.J. Simms; J.E. Oakey; D.J. Stephenson; P.J. Smith; J.R. Nicholls

1995-01-01T23:59:59.000Z

149

Toward Multi-scale Modeling and simulation of conduction in heterogeneous materials.  

SciTech Connect (OSTI)

This report summarizes a project in which the authors sought to develop and deploy: (i) experimental techniques to elucidate the complex, multiscale nature of thermal transport in particle-based materials; and (ii) modeling approaches to address current challenges in predicting performace variability of materials (e.g., identifying and characterizing physical- chemical processes and their couplings across multiple length and time scales, modeling infor- mation transfer between scales, and statically and dynamically resolving material structure and its evolution during manufacturing and device performance). Experimentally, several capabilities were sucessfully advanced. As discussed in Chapter 2 a flash diffusivity capabil- ity for measuring homogeneous thermal conductivity of pyrotechnic powders (and beyond) was advanced; leading to enhanced characterization of pyrotechnic materials and properties impacting component development. Chapter 4 describes sucess for the first time, although preliminary, in resolving thermal fields at speeds and spatial scales relevant to energetic components. Chapter 7 summarizes the first ever (as far as the authors know) application of TDTR to actual pyrotechnic materials. This is the first attempt to actually characterize these materials at the interfacial scale. On the modeling side, new capabilities in image processing of experimental microstructures and direct numerical simulation on complicated structures were advanced (see Chapters 3 and 5). In addition, modeling work described in Chapter 8 led to improved prediction of interface thermal conductance from first principles calculations. Toward the second point, for a model system of packed particles, significant headway was made in implementing numerical algorithms and collecting data to justify the approach in terms of highlighting the phenomena at play and pointing the way forward in de- veloping and informing the kind of modeling approach oringinally envisioned (see Chapter 6). In both cases much more remains to be accomplished.

Lechman, Jeremy B.; Battaile, Corbett Chandler.; Bolintineanu, Dan; Cooper, Marcia A.; Erikson, William W.; Foiles, Stephen M.; Kay, Jeffrey J [Sandia National Laboratories, Livermore, CA; Phinney, Leslie M.; Piekos, Edward S.; Specht, Paul Elliott; Wixom, Ryan R.; Yarrington, Cole

2015-01-01T23:59:59.000Z

150

GOLDSIM models of long-term radiation impact of conditionally cleared radioactive material  

Science Journals Connector (OSTI)

Abstract Management of waste materials from the decommissioning of nuclear installations offers opportunities for optimization. Large amounts of waste materials with low contents of various radionuclides could be recycled to save financial resources or repository capacity. The increase of the share of recycled materials compared to the current practice could be accomplished by applying the conditional clearance concept. Conditional clearance, as up to now is an unproven theoretical concept, demands utilization of the cleared material for the previously defined purpose (e.g., building construction). Safety studies needed for realization of this practice have to prove that conditionally cleared material will not cause radiation impact exceeding levels prescribed in health and safety regulations. Safety studies assess radiation impact during all manipulations with low level radioactive material (e.g., melting, component manufacturing, building of construction, etc.) as well as its impact on inhabitants living near the construction built using conditionally cleared material. The article is focused on modeling and calculation of long-term radiation impact on inhabitants living near the constructions. Models (scenarios) of various building applications were simulated using GOLDSIM software with Radionuclide Transport Module. Scenarios were selected according to information from the civil engineering business to cover the types of buildings most suitable for application of conditionally cleared material. The results of the calculations showed that conditional clearance represents no significant safety issue in the long-term. Calculated individual effective doses received by inhabitants did not exceed the given dose constraint (10 ?Sv/year) in case of any scenario evaluated. Detailed and transparent studies of the long-term impact of conditionally cleared materials are important especially for winning of public acceptance.

Michal Panik; Vladimir Necas

2013-01-01T23:59:59.000Z

151

Models for mean bonding length, melting point and lattice thermal expansion of nanoparticle materials  

SciTech Connect (OSTI)

Graphical abstract: Three models are derived to explain the nanoparticles size dependence of mean bonding length, melting temperature and lattice thermal expansion applied on Sn, Si and Au. The following figures are shown as an example for Sn nanoparticles indicates hilly applicable models for nanoparticles radius larger than 3 nm. Highlights: ? A model for a size dependent mean bonding length is derived. ? The size dependent melting point of nanoparticles is modified. ? The bulk model for lattice thermal expansion is successfully used on nanoparticles. -- Abstract: A model, based on the ratio number of surface atoms to that of its internal, is derived to calculate the size dependence of lattice volume of nanoscaled materials. The model is applied to Si, Sn and Au nanoparticles. For Si, that the lattice volume is increases from 20 ?{sup 3} for bulk to 57 ?{sup 3} for a 2 nm size nanocrystals. A model, for calculating melting point of nanoscaled materials, is modified by considering the effect of lattice volume. A good approach of calculating size-dependent melting point begins from the bulk state down to about 2 nm diameter nanoparticle. Both values of lattice volume and melting point obtained for nanosized materials are used to calculate lattice thermal expansion by using a formula applicable for tetrahedral semiconductors. Results for Si, change from 3.7 × 10{sup ?6} K{sup ?1} for a bulk crystal down to a minimum value of 0.1 × 10{sup ?6} K{sup ?1} for a 6 nm diameter nanoparticle.

Omar, M.S., E-mail: dr_m_s_omar@yahoo.com [Department of Physics, College of Science, University of Salahaddin-Erbil, Arbil, Kurdistan (Iraq)

2012-11-15T23:59:59.000Z

152

A general model for chemical erosion of carbon materials due to low-energy H + impact  

Science Journals Connector (OSTI)

Modeling the chemical erosion of carbon materials due to low-energy H + impact is of paramount importance for the prediction of the behavior of carbon-based plasma-facing components in nuclear fusion devices. In this paper a simple general model describing both energy and temperature dependence of carbon-based chemical erosion is presented. Enlightened by Hopf’s model {Hopf et al. [J. Appl. Phys.94 2373 (Year: 2003)} the chemical erosion is separated into the contributions from three mechanisms: thermal chemical erosion energetic chemical sputtering and ion-enhanced chemical erosion. Using input from the Monte Carlo code TRIDYN this model is able to reproduce experimental data well.

Shengguang Liu; Jizhong Sun; Shuyu Dai; Thomas Stirner; Dezhen Wang

2010-01-01T23:59:59.000Z

153

Modeling of molecular gas adsorption isotherms on porous materials with hybrid PC-SAFT–DFT  

Science Journals Connector (OSTI)

Abstract The developed hybrid PC-SAFT–DFT model, a coupling of density functional theory (DFT) with perturbed-chain statistical associating fluid theory (PC-SAFT), was used to study the adsorption of pure- and mixed-fluids on nano-porous materials, and carbons and zeolites were chosen as examples of nano-porous materials in this work for model performance evaluation. In the PC-SAFT–DFT model, the modified fundamental measure theory was used for the hard sphere contribution, the dispersion free energy functional was represented with a weighted density approximation, and the chain free energy functional from interfacial SAFT was used to account for the chain connectivity. The fluid was modeled as a chain molecule with molecular parameters taken from those in the bulk PC-SAFT. The external force field was used to describe the interaction between the solid surface of a nano-porous material and fluid. Application of this model was demonstrated on the gas adsorption on porous carbons and zeolites which were assumed to have slit- and cylinder-shaped pores with mean pore sizes, respectively. The parameters of the adsorption model were obtained by fitting to the pure-gas adsorption isotherms measured experimentally. With parameters of the model fitted to the pure-gas adsorption at one temperature, the model was used to predict the pure-gas adsorption at other temperatures as well as the adoption isotherms of mixtures. The model prediction was compared with the available experimental data, which shows that the predictions are reliable for most of the systems studied in this work. The effect of the pore size distribution on the model performance was further investigated, and it was found that the consideration of the pore size distribution (PSD) can improve the accuracy of the model results but the PSD analysis requires much more computing time.

Gulou Shen; Xiaohua Lu; Xiaoyan Ji

2014-01-01T23:59:59.000Z

154

Two-phase modeling of deflagration-to-detonation transition in granular materials: A critical examination of modeling issues  

E-Print Network [OSTI]

Two-phase modeling of deflagration-to-detonation transition in granular materials: A critical the deflagration-to-detonation transition DDT in granular explosives is critically reviewed. The continuum, analysis and numerical simulation of deflagration- to-detonation transition DDT in porous energetic

Kapila, Ashwani K.

155

An adaptive simulation model for analysis of nuclear material shipping operations  

SciTech Connect (OSTI)

Los Alamos has developed an advanced simulation environment designed specifically for nuclear materials operations. This process-level simulation package, the Process Modeling System (ProMoS), is based on high-fidelity material balance criteria and contains intrinsic mechanisms for waste and recycle flows, contaminant estimation and tracking, and material-constrained operations. Recent development efforts have focused on coupling complex personnel interactions, personnel exposure calculations, and stochastic process-personnel performance criteria to the material-balance simulation. This combination of capabilities allows for more realistic simulation of nuclear material handling operations where complex personnel interactions are required. They have used ProMoS to assess fissile material shipping performance characteristics at the Los Alamos National Laboratory plutonium facility (TA-55). Nuclear material shipping operations are ubiquitous in the DOE complex and require the largest suite of varied personnel interacting in a well-timed manner to accomplish the task. They have developed a baseline simulation of the present operations and have estimated the operational impacts and requirement of the pit production mission at TA-55 as a result of the SSM-PEIS. Potential bottlenecks have been explored and mechanisms for increasing operational efficiency are identified.

Boerigter, S.T.; Sena, D.J.; Fasel, J.H.

1998-12-31T23:59:59.000Z

156

A 3D Orthotropic Strain-Rate Dependent Elastic Damage Material Model.  

SciTech Connect (OSTI)

A three dimensional orthotropic elastic constitutive model with continuum damage and cohesive based fracture is implemented for a general polymer matrix composite lamina. The formulation assumes the possibility of distributed (continuum) damage followed b y localized damage. The current damage activation functions are simply partially interactive quadratic strain criteria . However, the code structure allows for changes in the functions without extraordinary effort. The material model formulation, implementation, characterization and use cases are presented.

English, Shawn Allen

2014-09-01T23:59:59.000Z

157

Problem solving in product development: a model for the advanced materials industries  

Science Journals Connector (OSTI)

Problem solving has been identified as a key aspect of product development. Yet, existing descriptive models of problem solving in product development are derived from experience in traditional fabrication and assembly-based industries. This paper examines the sequence of problem solving activities in the advanced materials industries. As opposed to the paradigm of product development seen in industries based on traditional metal fabrication and assembly production technology, development activities in advanced materials industries are focused around a core effort in process development. The paper characterises the steps of design and the associated testing patterns in the advanced materials industries. The model formalises the emphasis on process design and process experimentation, providing a richer description of the problem-solving sequence than the traditional design-build-test sequence so common in the fabrication/assembly industries.

Brent D. Barnett; Kim B. Clark

1998-01-01T23:59:59.000Z

158

02/25/2014 27th CSP Workshop 1 First Principles Modeling of Electrolye Materials  

E-Print Network [OSTI]

02/25/2014 27th CSP Workshop 1 First Principles Modeling of Electrolye Materials in All Abdessadek Lachgar. #12;02/25/2014 27th CSP Workshop 2 Outline What is meant by "first principles/electrode interfaces Remaining challenges #12;02/25/2014 27th CSP Workshop 3 What is meant by "first principles

Holzwarth, Natalie

159

Material Modeling and Development of a Realistic Dummy Testing Blast Induced Traumatic Brain Injury  

E-Print Network [OSTI]

Material Modeling and Development of a Realistic Dummy Head for Testing Blast Induced Traumatic Brain Injury S. G. M. Hossain1, C. A. Nelson1, T. Boulet2, M. Arnoult2, L. Zhang2, A. Holmberg2, J. Hein occurrence rate of traumatic brain injury (TBI) ­ 1.4 million people in US per year ­ 50,000 deaths ­ 235

Farritor, Shane

160

Modeling of Hydrogen Storage Materials: A Reactive Force Field for NaH  

E-Print Network [OSTI]

Modeling of Hydrogen Storage Materials: A Reactive Force Field for NaH Ojwang' J.G.O.*, Rutger van is the fall in potential energy surface during heating. Keywords: hydrogen storage, reactive force field governing hydrogen desorption in NaH. During the abstraction process of surface molecular hydrogen charge

Goddard III, William A.

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

A simplified model of thin layer static/flowing dynamics for granular materials with yield  

E-Print Network [OSTI]

/deposition processes when a layer of particles is flowing over a static layer or near the destabilization and arrestA simplified model of thin layer static/flowing dynamics for granular materials with yield, 75005 Paris, France, 4 ANGE team, INRIA, CETMEF, Lab. J.-L. Lions, Paris, France Abstract We introduce

Paris-Sud XI, Université de

162

Criteria for successful correction of thoracolumbar/lumbar curves in AIS patients: results of risk model calculations using target outcomes and failure analysis  

Science Journals Connector (OSTI)

Failure to select the appropriate lowest instrumented vertebra (LIV) in selective lumbar fusion (SLF) for thoracolumbar/lumbar curves (LC) can ... predictors of optimal outcomes and ASF efficacy for SLF.

Heiko Koller; Oliver Meier; Wolfgang Hitzl

2014-06-01T23:59:59.000Z

163

Effects of Environmental Conditions on the Sorption of VOCs on Building Materials-Part II: Model Evaluation (RP-1097)  

E-Print Network [OSTI]

1 Effects of Environmental Conditions on the Sorption of VOCs on Building Materials-Part II: Model, Ph.D. Member ASHRAE 1 ABSTRACT: Sorption data obtained by using small environmental chambers under to evaluate the linear Langmuir model and the diffusion model for VOC sorption by different building materials

Chen, Qingyan "Yan"

164

Phase-field modeling of void evolution and swelling in materials under irradiation  

SciTech Connect (OSTI)

Void swelling is an important phenomenon observed in both nuclear fuels and cladding materials in operating nuclear reactors. In this work we developed a phase-field model to simulate the void nucleation, growth, and the change of void volume fraction. Important material processes including the generation of defects such as vacancies and self-interstitials, their diffusion and annihilation, and void nucleation and evolution have been taken into account in our phase-field model. The thermodynamic and kinetic properties such as chemical free energy, interfacial energy, vacancy mobility, and annihilation rate of vacancies and interstitials are generally expressed as functions of the temperature. The developed model enables one to parametrically study critical void nucleus size, void growth kinetics, and void volume fraction evolutions. Our simulations demonstrated that the volume swelling displays a quasi-bell shape distribution with temperature that was often observed in experiments.

Li, Yulan; Hu, Shenyang Y.; Sun, Xin; Gao, Fei; Henager, Charles H.; Khaleel, Mohammad A.

2011-05-01T23:59:59.000Z

165

New model for the mixed-valence phenomenon in rare-earth materials  

Science Journals Connector (OSTI)

A model of a single rare-earth atom in a transition metal is derived, and terms describing screening of charge fluctuations in the resonant l=3 scattering channels by the l=2 channels are included. Using the Tomonaga approximation, in which charge fluctuations are represented by bosons, the screening channels are replaced by a boson field, and the model takes on a particularly simple form, the Anderson model of a magnetic impurity, now coupled to the boson field. The mean-field theory of this model suggests that, unlike in the original Anderson model, the impurity can be in a state of slowly fluctuating valence, which we identify with the mixed-valence phenomenon in certain rare-earth materials. These results suggest that the mixed-valence effect may be purely electronic in origin.

F. D. M. Haldane

1977-03-01T23:59:59.000Z

166

An elastic-perfectly plastic flow model for finite element analysis of perforated materials  

SciTech Connect (OSTI)

This paper describes the formulation of an elastic-perfectly plastic flow theory applicable to equivalent solid [EQS] modeling of perforated materials. An equilateral triangular array of circular penetrations is considered. The usual assumptions regarding geometry and loading conditions applicable to the development of elastic constants for EQS modeling of perforated plates are considered to apply here. An elastic-perfectly plastic [EPP] EQS model is developed for a collapse surface that includes fourth-order stress terms. The fourth order yield function has been shown to be appropriate for plates with a triangular array of circular holes. A complete flow model is formulated using the consistent tangent modulus approach based on the fourth order yield function.

Jones, D.P.; Gordon, J.L.; Hutula, D.N.; Banas, D.; Newman, J.B.

1999-02-01T23:59:59.000Z

167

Computational modelling of transport phenomena in high energy materials processing application: large eddy simulation and parallelisation  

Science Journals Connector (OSTI)

A comprehensive three-dimensional numerical model is presented in order to address the coupled turbulent momentum, heat and species transport during molten metal-pool convection in association with continuous evolution of solid-liquid interface typically encountered in high energy materials processing applications. The turbulent aspect is handled by a large eddy simulation (LES) model and the phase changing phenomena is taken care of by a modified enthalpy-porosity technique. The proposed finite volume based LES model is subsequently parallelised for effective computational economy. To demonstrate the effectiveness of the present model, a systematic analysis is subsequently carried out to simulate a typical high power laser surface alloying process, where the effects of turbulent transport can actually be realised.

Dipankar Chatterjee

2011-01-01T23:59:59.000Z

168

General Heat Transfer Characterization and Empirical Models of Material Storage Temperatures for the Los Alamos Nuclear Materials Storage Facility  

SciTech Connect (OSTI)

The Los Alamos National Laboratory's Nuclear Materials Storage Facility (NMSF) is being renovated for long-term storage of canisters designed to hold heat-generating nuclear materials. A fully passive cooling scheme, relying on the transfer of heat by conduction, free convection, and radiation has been proposed as a reliable means of maintaining material at acceptable storage temperatures. The storage concept involves placing radioactive materials, with a net heat-generation rate of 10 W to 20 W, inside a set of nested steel canisters. The canisters are, in placed in holding fixtures and positioned vertically within a steel storage pipe. Several hundred drywells are arranged in a linear array within a large bay and dissipate the waste heat to the surrounding air, thus creating a buoyancy driven airflow pattern that draws cool air into the storage facility and exhausts heated air through an outlet stack. In this study, an experimental apparatus was designed to investigate the thermal characteristics of simulated nuclear materials placed inside two nested steel canisters positioned vertically on an aluminum fixture plate and placed inside a section of steel pipe. The heat-generating nuclear materials were simulated with a solid aluminum cylinder containing .an embedded electrical resistance heater. Calibrated type T thermocouples (accurate to ~ O.1 C) were used to monitor temperatures at 20 different locations within the apparatus. The purposes of this study were to observe the heat dissipation characteristics of the proposed `canister/fixture plate storage configuration, to investigate how the storage system responds to changes in various parameters, and to develop and validate empirical correlations to predict material temperatures under various operating conditions

J. D. Bernardin; W. S. Gregory

1998-10-01T23:59:59.000Z

169

Two- and Three-Dimensional Microstructural Modeling of Asphalt Particulate Composite Materials using a Unified Viscoelastic-Viscoplastic-Viscodamage Constitutive Model  

E-Print Network [OSTI]

The main objective of this study is to develop and validate a framework for microstructural modeling of asphalt composite materials using a coupled thermo-viscoelastic, thermo-viscoplastic, and thermo-viscodamage constitutive model. In addition...

You, Taesun

2013-08-13T23:59:59.000Z

170

Theory, modeling and instrumentation for materials by design: Proceedings of workshop  

SciTech Connect (OSTI)

The following topics are contained in this volume: how can materials theory benefit from supercomputers and vice-versa; the materials of xerography; relationship between ab initio and semiempirical theories of electronic structure and renormalization group and the statistical mechanics of polymer systems; ab initio calculations of materials properties; metals in intimate contact; lateral interaction in adsorption: revelations from phase transitions; quantum model of thermal desorption and laser stimulated desorption; extended fine structure in appearance potential spectroscopy as a probe of solid surfaces; structural aspects of band offsets at heterojunction interfaces; multiconfigurational Green's function approach to quantum chemistry; wavefunctions and charge densities for defects in solids: a success for semiempirical theory; empirical methods for predicting the phase diagrams of intermetallic alloys; theoretical considerations regarding impurities in silicon and the chemisorption of simple molecules on Ni; improved Kohn-Sham exchange potential; structural stability calculations for films and crystals; semiempirical molecular orbital modeling of catalytic reactions including promoter effects; theoretical studies of chemical reactions: hydrolysis of formaldehyde; electronic structure calculations for low coverage adlayers; present status of the many-body problem; atomic scattering as a probe of physical adsorption; and, discussion of theoretical techniques in quantum chemistry and solid state physics.

Allen, R.E.; Cocke, D.L.; Eberhardt, J.J.; Wilson, A. (eds.)

1984-01-01T23:59:59.000Z

171

Illicit trafficking of radiological & nuclear materials : modeling and analysis of trafficking trends and risks.  

SciTech Connect (OSTI)

Concerns over the illicit trafficking of radiological and nuclear materials were focused originally on the lack of security and accountability of such material throughout the former Soviet states. This is primarily attributed to the frequency of events that have occurred involving the theft and trafficking of critical material components that could be used to construct a Radiological Dispersal Device (RDD) or even a rudimentary nuclear device. However, with the continued expansion of nuclear technology and the deployment of a global nuclear fuel cycle these materials have become increasingly prevalent, affording a more diverse inventory of dangerous materials and dual-use items. To further complicate the matter, the list of nuclear consumers has grown to include: (1) Nation-states that have gone beyond the IAEA agreed framework and additional protocols concerning multiple nuclear fuel cycles and processes that reuse the fuel through reprocessing to exploit technologies previously confined to the more industrialized world; (2) Terrorist organizations seeking to acquire nuclear and radiological material due to the potential devastation and psychological effect of their use; (3) Organized crime, which has discovered a lucrative market in trafficking of illicit material to international actors and/or countries; and (4) Amateur smugglers trying to feed their families in a post-Soviet era. An initial look at trafficking trends of this type seems scattered and erratic, localized primarily to a select group of countries. This is not necessarily the case. The success with which other contraband has been smuggled throughout the world suggests that nuclear trafficking may be carried out with relative ease along the same routes by the same criminals or criminal organizations. Because of the inordinately high threat posed by terrorist or extremist groups acquiring the ingredients for unconventional weapons, it is necessary that illicit trafficking of these materials be better understood as to prepare for the sustained global development of the nuclear fuel cycle. Conversely, modeling and analyses of this activity must not be limited in their scope to loosely organized criminal smuggling, but address the problem as a commercial, industrial project for the covert development of nuclear technologies and unconventional weapon development.

York, David L.; Love, Tracia L.; Rochau, Gary Eugene

2005-01-01T23:59:59.000Z

172

Water Transport in PEM Fuel Cells: Advanced Modeling, Material Selection, Testing, and Design Optimization  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

in PEM Fuel Cells: in PEM Fuel Cells: Advanced Modeling, Material Selection, Testing, and Design Optimization J. Vernon Cole and Ashok Gidwani CFDRC Prepared for: DOE Hydrogen Fuel Cell Kickoff Meeting February 13, 2007 This presentation does not contain any proprietary or confidential information. Background Water Management Issues Arise From: ƒ Generation of water by cathodic reaction ƒ Membrane humidification requirements ƒ Capillary pressure driven transport through porous MEA and GDL materials ƒ Scaling bipolar plate channel dimensions J.H. Nam and M. Kaviany, Int. J. Heat Mass Transfer, 46, pp. 4595-4611 (2003) Relevant Barriers and Targets ƒ Improved Gas Diffusion Layer, Flow Fields, Membrane Electrode Assemblies Needed to Improve Water Management: * Flooding blocks reactant transport

173

Casimir Piston of Real Materials and its Application to Multi-Layer Models  

E-Print Network [OSTI]

In this article, we derive the formula for the Casimir force acting on a piston made of real material moving inside a perfectly conducting rectangular box. It is shown that by taking suitable limits, one recovers the formula for the Casimir force acting on a perfectly conducting piston or an infinitely permeable piston. Lifshitz formula for finite temperature Casimir force acting on parallel plates made of real materials is re-derived by considering the five-layer model in the context of piston approach. It is observed that the divergences of the Casimir force will only cancel under certain conditions, for example, when the regions separated by the plates are filled with media of the same refractive index.

L. P. Teo

2010-02-28T23:59:59.000Z

174

WaterTransport in PEM Fuel Cells: Advanced Modeling, Material Selection, Testing and Design Optimization  

SciTech Connect (OSTI)

Water management in Proton Exchange Membrane, PEM, Fuel Cells is challenging because of the inherent conflicts between the requirements for efficient low and high power operation. Particularly at low powers, adequate water must be supplied to sufficiently humidify the membrane or protons will not move through it adequately and resistance losses will decrease the cell efficiency. At high power density operation, more water is produced at the cathode than is necessary for membrane hydration. This excess water must be removed effectively or it will accumulate in the Gas Diffusion Layers, GDLs, between the gas channels and catalysts, blocking diffusion paths for reactants to reach the catalysts and potentially flooding the electrode. As power density of the cells is increased, the challenges arising from water management are expected to become more difficult to overcome simply due to the increased rate of liquid water generation relative to fuel cell volume. Thus, effectively addressing water management based issues is a key challenge in successful application of PEMFC systems. In this project, CFDRC and our partners used a combination of experimental characterization, controlled experimental studies of important processes governing how water moves through the fuel cell materials, and detailed models and simulations to improve understanding of water management in operating hydrogen PEM fuel cells. The characterization studies provided key data that is used as inputs to all state-of-the-art models for commercially important GDL materials. Experimental studies and microscopic scale models of how water moves through the GDLs showed that the water follows preferential paths, not branching like a river, as it moves toward the surface of the material. Experimental studies and detailed models of water and airflow in fuel cells channels demonstrated that such models can be used as an effective design tool to reduce operating pressure drop in the channels and the associated costs and weight of blowers and pumps to force air and hydrogen gas through the fuel cell. Promising improvements to materials structure and surface treatments that can potentially aid in managing the distribution and removal of liquid water were developed; and improved steady-state and freeze-thaw performance was demonstrated for a fuel cell stack under the self-humidified operating conditions that are promising for stationary power generation with reduced operating costs.

J. Vernon Cole; Abhra Roy; Ashok Damle; Hari Dahr; Sanjiv Kumar; Kunal Jain; Ned Djilai

2012-10-02T23:59:59.000Z

175

Systems Modeling, Simulation and Material Operating Requirements for Chemical Hydride Based Hydrogen Storage  

SciTech Connect (OSTI)

Research on ammonia borane (AB, NH3BH3) has shown it to be a promising material for chemical hydride based hydrogen storage. AB was selected by DOE's Hydrogen Storage Engineering Center of Excellence (HSECoE) as the initial chemical hydride of study because of its high hydrogen storage capacity (up to 19.6% by weight for the release of {approx}2.5 molar equivalents of hydrogen gas) and its stability under typical ambient conditions. A new systems concept based on augers, ballast tank, hydrogen heat exchanger and H2 burner was designed and implemented in simulation. In this design, the chemical hydride material was assumed to produce H2 on the augers itself, thus minimizing the size of ballast tank and reactor. One dimensional models based on conservation of mass, species and energy were used to predict important state variables such as reactant and product concentrations, temperatures of various components, flow rates, along with pressure, in various components of the storage system. Various subsystem components in the models were coded as C language S-functions and implemented in Matlab/Simulink environment. The control variable AB (or alane) flow rate was determined through a simple expression based on the ballast tank pressure, H2 demand from the fuel cell and hydrogen production from AB (or alane) in the reactor. System simulation results for solid AB, liquid AB and alane for both steady state and transient drive cycle cases indicate the usefulness of the model for further analysis and prototype development.

Devarakonda, Maruthi N.; Brooks, Kriston P.; Ronnebro, Ewa; Rassat, Scot D.

2012-02-01T23:59:59.000Z

176

Failure analysis of a Calm buoy anchor chain system  

SciTech Connect (OSTI)

In 1982, Philippines-Cities Service experienced a wear failure of a cateneary anchor chain mooring used to moor a CALM type buoy. In order to explain the failure, Cities Service conducted a comprehensive failure analysis and model basin test of the failed system, and in addition, performed comparative wear tests on U3 and U4 chain. The results of the investigation indicate that interlink motion and resulting wear are an important design criteria for mooring lines.

Shoup, G.J.; Mueller, R.A.

1984-05-01T23:59:59.000Z

177

Demonstration of a computer model for residual radioactive material guidelines, RESRAD  

SciTech Connect (OSTI)

A computer model was developed to calculate residual radioactive material guidelines for the US Department of Energy (DOE). This model, called RESRAD, can be run on IBM or IBM-compatible microcomputer. Seven potential exposure pathways from contaminated soil are analyzed, including external radiation exposure and internal radiation exposure from inhalation and food digestion. The RESRAD code has been applied to several DOE sites to derive soil cleanup guidelines. The experience gained indicates that a comprehensive set of site-specific hydrogeologic and geochemical input parameters must be used for a realistic pathway analysis. The RESRAD code is a useful tool; it is easy to run and very user-friendly. 6 refs., 12 figs.

Yu, C.; Yuan, Y.C.; Zielen, A.J.; Wallo, A. III (Argonne National Lab., IL (USA); USDOE, Washington, DC (USA))

1989-01-01T23:59:59.000Z

178

Theory and Modeling of Weakly Bound/Physisorbed Materials for Hydrogen Storage  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Modeling of and Modeling of Weakly Bound/Physisorbed Materials for Hydrogen Storage Andrew Williamson Quantum Simulations Group Lawrence Livermore National Laboratory Tadashi Ogitsu Lawrence Livermore National Laboratory Yong-Hyun Kim, Mike Heben, and Shengbai Zhang National Renewable Energy Laboratory UCRL-209054 This work was performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48. Outline * Storage by physisorption: - CNT, fullerenes, carbon aerogels - Doping, Decorating, Charging * Accuracy of Methods: DFT, QMC and Quantum Chemistry - Van der Waals interactions - * Use of DFT to screen for new compounds - 2 binding to doped fullerenes * LDA, GGA and ad-hoc corrections to pseudopotentials

179

France and US explain failures  

Science Journals Connector (OSTI)

... uncertain ignitions and failures early in the programme, to the small size of the "pyrotechnic" that lights the engine.

Robert Walgate; Joseph Palca

1986-07-10T23:59:59.000Z

180

Emissions Control Failures in Passenger Cars  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

5 5 Emissions Control Failures in Passenger Cars Two measures of car model malfunction probability, fraction of cars over 1% CO (y-axis) and average CO concentration of all cars (x-axis), demonstrate that five 1987-89 car models (14 year-model combinations) have a malfunction probability several times that of all other models. When an automobile's emissions control system fails, it may be because that model is more prone to failure than others, according to a study conducted by the Center's Energy Analysis Program and Marc Ross of the University of Michigan. This finding goes against the conventional wisdom that improper maintenance or deliberate disabling of the emissions systems by car owners is the cause of "high-emitting" vehicles. The results may provide clean-air

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

A model for self-defocusing in laser drilling of polymeric materials  

SciTech Connect (OSTI)

A numerical thermal model is presented for laser microvias drilling in multilayer electronic substrates with Nd:YAG (YAG denotes yttrium aluminum garnet) and CO{sub 2} lasers. Such substrates have different optical properties such as the refractive index and absorption coefficient at these two laser wavelengths, resulting in different drilling mechanisms. Since the skin depth of the polymer is large for both the lasers, volumetric heating is considered in the model. As soon as a small cavity is formed during the drilling process, the concave curvature of the drilling front acts as a concave lens that diverges the incident laser beam. This self-defocusing effect can greatly reduce the drilling speed as predicted by the model. This effect makes the refractive index of the substrate at different wavelengths an important parameter for laser drilling. The model was used to calculate the laser ablation thresholds which were found to be 8 and 56 J/cm{sup 2} for the CO{sub 2} and Nd:YAG lasers respectively. Due to the expulsion of materials because of high internal pressures in the case of Nd:YAG laser microvia drilling, the ablation threshold may be far below the calculated value. A particular laser beam shape, such as pitch fork, was found to drill better holes than the Gaussian beam.

Zhang Chong; Quick, Nathaniel R.; Kar, Aravinda [Department of Mechanical, Materials and Aerospace Engineering, College of Optics and Photonics, Center for Research and Education in Optics and Lasers (CREOL), University of Central Florida, Orlando, Florida 32816-2700 (United States); AppliCote Associates, LLC, 1445 Dolgner Place, Suite 23, Sanford, Florida 32771 (United States); College of Optics and Photonics, Center for Research and Education in Optics and Lasers (CREOL), University of Central Florida, Orlando, Florida 32816-2700 (United States)

2008-01-01T23:59:59.000Z

182

Human errors and structural failure probability  

Science Journals Connector (OSTI)

Predicting the influence of human errors on structural failure probability is the topic of this paper. There are two principal reasons for needing this information. First, if errors are present after the design of a structure is completed, as is generally the case, this will provide the engineer with a measure of what effect such errors will have on the structural safety. Second, this information is directly useful in the optimisation of quality assurance expenditures, which can effectively be used for controlling the probability of structural failure due to errors. Simplified probabilistic models are developed to integrate human errors into structural risk assessment. Numerical examples illustrate the sensitivity of structural safety to errors.

Dan M. Frangopol

1988-01-01T23:59:59.000Z

183

Modeling and Design of Material Separation Systems with Applications to Recycling  

E-Print Network [OSTI]

Material separation technology is critical to the success of the material recycling industry. End-of-life products, post-consumer waste, industrial excess, or otherwise collected materials for reuse are typically mixed ...

Wolf, Malima Isabelle, 1981-

2011-01-01T23:59:59.000Z

184

Thermo-Viscoelastic-Viscoplastic-Viscodamage-Healing Modeling of Bituminous Materials: Theory and Computation  

E-Print Network [OSTI]

Time- and rate-dependent materials such as polymers, bituminous materials, and soft materials clearly display all four fundamental responses (i.e. viscoelasticity, viscoplasticity, viscodamage, and healing) where contribution of each response...

Darabi Konartakhteh, Masoud

2012-10-19T23:59:59.000Z

185

A Methodology for Weapon System Availability Assessment, incorporating Failure, Damage and  

E-Print Network [OSTI]

A Methodology for Weapon System Availability Assessment, incorporating Failure, Damage in a hostile environment, they are particularly vulnerable in sit- uations of unavailability. Military weapon principles for weapon systems modeling that integrate both system failure and system damage, as well

Boyer, Edmond

186

Mechanical Response and Decomposition of Thermally Degraded Energetic Materials: Experiments and Model Simulations  

SciTech Connect (OSTI)

We report progress of a continuing effort to characterize and simulate the response of energetic materials (EMs), primarily HMX-based, under conditions leading to cookoff. Our experiments include mechanical-effects testing of HMX and FIMX with binder at temperatures nearing decomposition thresholds. Additional experiments have focused on decomposition of these EMs under confinement, measuring evolution of gas products and observing the effect of pressurization on the solid. Real-time measurements on HMX show abrupt changes that maybe due to sudden void collapse under increasing load. Postmortem examination shows significant internal damage to the pellets, including voids and cracks. These experiments have been used to help develop a constitutive model for pure HMX. Unconfined uniaxial compression tests were performed on HMX and LX-14 to examine the effect of binders on the deviatoric strength of EM pellets, and to assess the need of including deviatoric terms in the model. A scale-up experiment will be described that is being developed to validate the model and provide additional diagnostics.

KANESHIGE,MICHAEL J.; RENLUND,ANITA M.; SCHMITT,ROBERT G.; WELLMAN,GERALD W.

1999-10-14T23:59:59.000Z

187

Photoelectrochemical Materials: Theory and Modeling - DOE Hydrogen and Fuel Cells Program FY 2012 Annual Progress Report  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

8 8 DOE Hydrogen and Fuel Cells Program FY 2012 Annual Progress Report Muhammad N. Huda (Primary Contact), Yanfa Yan*, Todd Deutsch*, Mowafak M. Al-Jassim* and A. John A. Turner* Department of Physics University of Texas at Arlington Arlington, TX 76019 Phone: (817) 272-1097 Email: huda@uta.edu *National Renewable Energy Laboratory DOE Manager HQ: Eric L. Miller Phone: (202) 287-5892 Email: Eric.Miller@ee.doe.gov Subcontractor: University of Texas at Arlington, Arlington, TX Project Start Date: September 2009 Project End Date: August 2012 Fiscal Year (FY) 2012 Objectives For FY 2012, the main goal of this project was to improve materials efficiency by understanding and hence tuning the following by theoretical/computational modeling

188

E-Print Network 3.0 - assisted failures initiating Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

4 5 > >> 1 Failure Modelling in Software Architecture Design for Safety Weihang Wu Tim Kelly Summary: modelling assist the architectural design process? How can CSP be applied to...

189

Application of the method of effective potentials to a model for twinning in elastic materials  

SciTech Connect (OSTI)

We extend the method of effective potentials to systems with next-nearest-neighbor interactions, and apply it to a one-dimensional discrete model for twins in elastic materials. The energy of the system is given by H = +(..gamma../2) (u/sub n//sub +1/-2u/sub n/+u/sub n-1/)/sup 2/ -cosu/sub n/, where the first two terms model the elastic strain-dependent energy which we take to be in the form of a double well in the strains and the third term gives its dependence on the discretized strain gradients. The periodic potential in the last term is introduced to allow for additional interactions with a background such as a parent phase, grain boundaries, or another array of twins. We obtain the phase diagram and show that it consists of various modulated commensurate as well as incommensurate ground-state configurations. We find continuous phonon-driven transitions between the homogeneous and any modulated phase, an incomplete devil's staircase in a narrow region close to the homogeneous phase and first-order soliton-driven transitions between commensurate phases. The first-order transition lines end at triple points where three commensurate phases coexist. In contrast to other nonconvex models we do not find here any superdegenerate points. We give general arguments which exclude the existence of such points in the present model. Preliminary results obtained by driving the system are discussed. These consist of various metastable configurations exhibiting strong hysteretic variation with the driving force.

Marianer, S.; Floria, L.M.

1988-12-01T23:59:59.000Z

190

Modeling of the Effective Elastic and Thermal Properties of Glass-Ceramic Solid Oxide Fuel Cell Seal Materials  

SciTech Connect (OSTI)

In this study, the effective elastic properties and coefficients of thermal expansion (CTE) of a glass-ceramic were predicted using homogenization techniques. Using G18, a glass-ceramic solid oxide fuel cell (SOFC) sealant as an initial reference material, the effectiveness of different homogenization models was investigated for a two-phase glass-ceramic. The elastic properties and CTEs of the G18 amorphous phase are currently unknown. Thus, estimated values were used as an input to the models. The predictive model offers accurate macroscopic values on both the elastic modulus and the CTE of glass-ceramic materials, providing the estimated amorphous values are reasonable. This model can be used in designing glass-ceramic SOFC seal materials for its specific operation conditions.

Milhans, Jacqueline; Ahzi, Said; Garmestani, Hamid; Khaleel, Mohammad A.; Sun, Xin; Koeppel, Brian J.

2009-05-01T23:59:59.000Z

191

Patterns of Locoregional Failure After Exclusive IMRT for Oropharyngeal Carcinoma  

SciTech Connect (OSTI)

Purpose: To assess the patterns of failure after intensity-modulated radiotherapy (IMRT) for oropharyngeal squamous cell carcinoma (SCC). Methods and Materials: We analyzed patients treated at the University of Texas Medical Branch between May 2002 and February 2006 who met the following criteria: (1) definitive IMRT without chemotherapy for oropharyngeal SCC; (2) no pretreatment radical surgery; (3) minimal follow-up of 1 year. The location of each nodal/primary failure was co-registered to the pretreatment planning computed tomography scan and then expanded by 5 mm to a planning target volume (PTV) of the failure (PTV-f). We then investigated whether the prescription dose to the PTV-f had been appropriate for the amount of disease present before treatment and whether the PTV-f had been adequately covered. Results: A total of 50 patients were eligible. With a median follow-up of 32.6 months (range, 12.1-58.6), three local and six regional failures were observed in 8 patients. All but one failure, that had been neglected, were recorded within 14 months of the treatment end. Of the nine failures, four developed in the neck treated electively to the lowest dose level; in all of them, we could retrospectively identify initial positive lymph nodes that might have justified the subsequent failure. The remaining five failures developed in proximity of the high-dose volume. In all but one, the volume of region of interest receiving {>=}95% of the dose of the PTV-f was >95%, suggesting adequate coverage. In 1 patient, about 20% of PTV-f was outside the 95% isodose, so that marginal underdosing could not be ruled out. Conclusions: A potential cause could be identified in all the failures in the lowest dose level. The implications and possible remedies are discussed. Most failures around the high-dose region were 'true failures' with no apparent technical caus000.

Sanguineti, Giuseppe [Department of Radiation Oncology, University of Texas Medical Branch, Galveston, TX (United States)], E-mail: gsangui1@jhmi.edu; Gunn, G. Brandon [Department of Radiation Oncology, University of Texas Medical Branch, Galveston, TX (United States); Endres, Eugene J. [Department of Medical Physics, University of Texas Medical Branch, Galveston, TX (United States); Chaljub, Gregory [Department of Neuroradiology, University of Texas Medical Branch, Galveston, TX (United States); Cheruvu, Praveena [Department of Radiation Oncology, University of Texas Medical Branch, Galveston, TX (United States); Parker, Brent [Department of Medical Physics, University of Texas Medical Branch, Galveston, TX (United States)

2008-11-01T23:59:59.000Z

192

Component failure data handbook  

SciTech Connect (OSTI)

This report presents generic component failure rates that are used in reliability and risk studies of commercial nuclear power plants. The rates are computed using plant-specific data from published probabilistic risk assessments supplemented by selected other sources. Each data source is described. For rates with four or more separate estimates among the sources, plots show the data that are combined. The method for combining data from different sources is presented. The resulting aggregated rates are listed with upper bounds that reflect the variability observed in each rate across the nuclear power plant industry. Thus, the rates are generic. Both per hour and per demand rates are included. They may be used for screening in risk assessments or for forming distributions to be updated with plant-specific data.

Gentillon, C.D.

1991-04-01T23:59:59.000Z

193

Boiler Stack Economizer Tube Failure  

Science Journals Connector (OSTI)

A metallurgical evaluation was performed to investigate the failure of a type 304 stainless steel tube from a boiler stack economizer. The tube had three distinct degradation mechanisms...

Ryan J. Haase; Larry D. Hanke

2013-10-01T23:59:59.000Z

194

Modeling and Simulation in Material Sciences and Engineering, 1:(3),pp. 225263. COMPUTATIONAL MODELLING OF SINGLE CRYSTALS  

E-Print Network [OSTI]

in propeller and turbine blades, or as basic building blocks of numerous material systems, such as polycrys

Ortiz, Michael

195

Artificial Neural Network Model for Prediction of Fatigue Lives of Composites Materials  

Science Journals Connector (OSTI)

The application of composites as engineering materials has become state of art and fatigue is one of the most complicated problems for fiber composites. The life prediction of a newly developed material is costly...

Sanjay Mathur; Prakash Chandra Gope…

2007-01-01T23:59:59.000Z

196

Material characterization and modeling for piezoelectric actuation and power generation under high electromechanical driving levels  

E-Print Network [OSTI]

High electromechanical loads parallel to piezoelectric polarization might result in depolarization of the material, depending on the material property itself and the external excitations such as electrical field, electrical ...

Lin, Ching-Yu, 1972-

2002-01-01T23:59:59.000Z

197

Multi-Length Scale-Enriched Continuum-Level Material Model for Kevlar  

E-Print Network [OSTI]

engineering analyses of ballistic/blast impact protective structures made of this type of material do materials and struc- tures. These materials/structures are commonly used in various protective systems whose projectiles (e.g., bullets, mine, IED or turbine fragments, etc.). Development of the aforementioned

Grujicic, Mica

198

Modeling Thermodynamics and Dynamics of MixtureModeling Thermodynamics and Dynamics of Mixture Adsorption in Porous MaterialsAdsorption in Porous Materials  

E-Print Network [OSTI]

models to describe adsorption dynamics · Apply to case of Enhanced Coalbed Methane Extraction ­ Trillions of cubic meters of methane and carbon dioxide can be extracted and stored in unusable coal seams Models temperature, adsorption increases with pressure. Carbon Dioxide interacts more strongly with coal than methane

Mountziaris, T. J.

199

Slope failures in Hong Kong  

Science Journals Connector (OSTI)

...the large catchment area. Summary The most abundant failures during multiple events are the Type 1 and 2 slips, or combina- Iions such as in Fig. 1 lb, and these have the most disastrous consequences. Isolated events SLOPE FAILURES IN HONG KONG 59 and...

Peter Lumb

200

Failure of man-made cavities in salt and surface subsidence due to sulfur mining  

SciTech Connect (OSTI)

An engineering data base relevant to subsidence due to sulfur mining and to structural failure of cavities in salt is established, evaluated and documented. Nineteen failure events are discussed. Based on these documented failure events, capabilities of and inputs to a mathematical model of cavity failure are determined. Two failure events are adequately documented for use in model verification studies. A conclusion of this study that is pertinent to the Strategic Petroleum Reserve is that cavity failures in dome salt are fairly rare, but that as the number of large cavities (especially those having large roof spans) increases, failures will probably be more common unless stability and failure mechanisms of cavities are better understood.

Coates, G.K.; Lee, C.A.; McClain, W.C.; Senseny, P.E.

1981-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

How car material life-cycle emissions are considered in environmental rating methodologies? Suggestion of expedite models and discussion  

Science Journals Connector (OSTI)

Abstract This paper reviews existing vehicle environmental rating methodologies worldwide and focuses on how these methodologies deal with alternative vehicle technologies (plug-in vehicles, hybrid vehicles, and fuel cell vehicles) and emissions of greenhouse gases (CO2, N2O, and CH4) and pollutants (NOx, VOC, CO, SOx, PM10 and PM2.5) derived from embodied materials life cycle. United States, Mexico, Europe and Australia have public access data and websites with top 10 rankings. The ways the scores are calculated for each vehicle have differences in what regards the considered boundaries for the emissions analysis. In Europe, there is still not a unique rating methodology or ranking system, e.g., Belgium, Germany and United Kingdom have their specific scoring schemes. Multilinear regression models were developed as an attempt to estimate the vehicle embodied emissions as a function of vehicle lifecycle mileage, electricity mix, vehicle mass, battery mass and fuel cell power to cope with different production regions and different alternative vehicle technologies. The regression models were validated against Volkswagen life cycle assessments (LCAs), and compared against American Council for an Energy Efficient Economy (ACEEE) – Green Book linear functions for material assessment and UK 12 material dataset for materials assessment. The developed models proved to be useful in applications related to rating methodologies using life-cycle concepts, with good reliability for comparisons considering the complexity of processes involved in vehicle materials life-cycle assessment.

Gonçalo N. Correia; Teresa P. Batista; Sara S. Marques; Carla M. Silva

2014-01-01T23:59:59.000Z

202

First-Principles Models of Properties of LMR-NMC Materials  

Broader source: Energy.gov (indexed) [DOE]

can yield insights into the mechanism of VF, suggest directions for materials synthesis, and assist in interpretation of spectroscopies (e.g., NMR, XAS) for...

203

8th International Conference on Probability Methods Applied to Power Systems, Ames Iowa, September 2004 Estimating Failure Propagation in Models of  

E-Print Network [OSTI]

and a power systems blackout model of cascading transmission line overloads. The comparisons suggest stage. OPA is a power system blackout model that represents probabilistic cascading line outages. The initial disturbance is generated by random line outages and load variations. Overloaded lines outage

204

FRACTURE FAILURE CRITERIA OF SOFC PEN STRUCTURE  

SciTech Connect (OSTI)

Thermal stresses and warpage of the PEN are unavoidable due to the temperature changes from the stress-free sintering temperature to room temperature and mismatch of the coefficients of thermal expansion (CTE) of various layers in the PEN structures of solid oxide fuel cells (SOFC) during the PEN manufacturing process. In the meantime, additional mechanical stresses will also be created by mechanical flattening during the stack assembly process. The porous nature of anode and cathode in the PEN structures determines presence of the initial flaws and crack on the interfaces of anode/electrolyte/cathode and in the interior of the materials. The sintering/assembling induced stresses may cause the fracture failure of PEN structure. Therefore, fracture failure criteria for SOFC PEN structures is developed in order to ensure the structural integrity of the cell and stack of SOFC. In this paper, the fracture criteria based on the relationship between the critical energy release rate and critical curvature and maximum displacement of the warped cells caused by the temperature changes as well as mechanical flattening process is established so that possible failure of SOFC PEN structures may be predicted deterministically by the measurement of the curvature and displacement of the warped cells.

Liu, Wenning N.; Sun, Xin; Khaleel, Mohammad A.; Qu, Jianmin

2007-04-30T23:59:59.000Z

205

Verification and Validation of EnergyPlus Conduction Finite Difference and Phase Change Material Models for Opaque Wall Assemblies  

SciTech Connect (OSTI)

Phase change materials (PCMs) represent a potential technology to reduce peak loads and HVAC energy consumption in buildings. There are few building energy simulation programs that have the capability to simulate PCM but their accuracy has not been completely tested. This report summarizes NREL efforts to develop diagnostic tests cases to obtain accurate energy simulations when PCMs are modeled in residential buildings.

Tabares-Velasco, P. C.; Christensen, C.; Bianchi, M.; Booten, C.

2012-07-01T23:59:59.000Z

206

Accepted to Diamond and Related Materials A kinetic model of diamond nucleation and silicon carbide interlayer formation during  

E-Print Network [OSTI]

Accepted to Diamond and Related Materials A kinetic model of diamond nucleation and silicon carbide Engineering, Colorado State University, Fort Collins, CO, USA Abstract The presence of thin silicon carbide diffusion of carbon atoms into the silicon carbide layer, and the morphology and orientation of the diamond

Dandy, David

207

Multidiscipline Modeling in Materials and Structures Emerald Article: A study of the blast-induced brain white-matter damage  

E-Print Network [OSTI]

Multidiscipline Modeling in Materials and Structures Emerald Article: A study of the blast, (2012),"A study of the blast-induced brain white-matter damage and the associated diffuse axonal injury Abstract Purpose ­ Blast-induced traumatic brain injury (TBI) is a signature injury of the current military

Grujicic, Mica

208

Micromechanics-based elastic model for functionally graded materials with particle interactions  

E-Print Network [OSTI]

, and the simultaneous ability of the same material system to provide the re- quired thermal or impact resistance, a continuous trade-off of metallic toughness and high thermal conductivity is made with ceramic hardness and low thermal conductivity. In heat and impact protection applications, the material multifunctionality

Paulino, Glaucio H.

209

A generic material flow control model applied in two industrial sectors  

Science Journals Connector (OSTI)

This paper addresses the problem of generic planning and control of automated material handling systems (AMHSs). We build upon previous work to provide a proof of concept for generic control of AMHSs in different domains. We present a generic control ... Keywords: Automated material handling systems (AMHSs), Baggage Handling, Distribution, Generic control architecture, Real-time scheduling

S. W. A. Haneyah; P. C. Schuur; J. M. J. Schutten; W. H. M. Zijm

2013-08-01T23:59:59.000Z

210

Computational modeling and design of actively-cooled microvascular materials Soheil Soghrati a,b  

E-Print Network [OSTI]

to the optimization study, the IGFEM solver is validated through comparison with infrared measurements of the thermal of such systems to a broad field including autonomic materials [6], biotechnology [7,8], chemical reactors [9 in two specific ways: (i) by direct extraction of heat from the thermally loaded material, and (ii

Sottos, Nancy R.

211

Simulations of Failure via Three-Dimensional Cracking in Fuel Cladding for Advanced Nuclear Fuels  

SciTech Connect (OSTI)

Enhancing performance of fuel cladding and duct alloys is a key means of increasing fuel burnup. This project will address the failure of fuel cladding via three-dimensional cracking models. Researchers will develop a simulation code for the failure of the fuel cladding and validate the code through experiments. The objective is to develop an algorithm to determine the failure of fuel cladding in the form of three-dimensional cracking due to prolonged exposure under varying conditions of pressure, temperature, chemical environment, and irradiation. This project encompasses the following tasks: 1. Simulate 3D crack initiation and growth under instantaneous and/or fatigue loads using a new variant of the material point method (MPM); 2. Simulate debonding of the materials in the crack path using cohesive elements, considering normal and shear traction separation laws; 3. Determine the crack propagation path, considering damage of the materials incorporated in the cohesive elements to allow the energy release rate to be minimized; 4. Simulate the three-dimensional fatigue crack growth as a function of loading histories; 5. Verify the simulation code by comparing results to theoretical and numerical studies available in the literature; 6. Conduct experiments to observe the crack path and surface profile in unused fuel cladding and validate against simulation results; and 7. Expand the adaptive mesh refinement infrastructure parallel processing environment to allow adaptive mesh refinement at the 3D crack fronts and adaptive mesh merging in the wake of cracks. Fuel cladding is made of materials such as stainless steels and ferritic steels with added alloying elements, which increase stability and durability under irradiation. As fuel cladding is subjected to water, chemicals, fission gas, pressure, high temperatures, and irradiation while in service, understanding performance is essential. In the fast fuel used in advanced burner reactors, simulations of the nuclear fuels are critical to understand the burnup, and thus the fuel efficiency.

Lu, Hongbing; Bukkapatnam, Satish; Harimkar, Sandip; Singh, Raman; Bardenhagen, Scott

2014-01-09T23:59:59.000Z

212

Failure Scenario FMEA: Theoretical and Applicative Aspects  

Science Journals Connector (OSTI)

This paper aims to give a new growth perspective of Failure Modes and Effects Analysis that can be called “Expected Costs of Failure Scenarios”. Traditional FMEA discipline has been used to evaluate Failure ... t...

E. Locatelli; N. Valsecchi; G. Maccarini…

2002-01-01T23:59:59.000Z

213

Modelling and simulations of the chemo-mechanical behaviour of leached cement-based materials: Interactions between damage and leaching  

SciTech Connect (OSTI)

The assessment of the durability of cement-based materials, which could be employed in underground structures for nuclear waste disposal, requires accounting for deterioration factors, such as chemical attacks and damage, and for the interactions between these phenomena. The objective of the present paper consists in investigating the long-term behaviour of cementitious materials by simulating their response to chemical and mechanical solicitations. In a companion paper (Stora et al., submitted to Cem. Concr. Res. 2008), the implementation of a multi-scale homogenization model into an integration platform has allowed for evaluating the evolution of the mineral composition, diffusive and elastic properties inside a concrete material subjected to leaching. To complete this previous work, an orthotropic micromechanical damage model is presently developed and incorporated in this numerical platform to estimate the mechanical and diffusive properties of damaged cement-based materials. Simulations of the chemo-mechanical behaviour of leached cementitious materials are performed with the tool thus obtained and compared with available experiments. The numerical results are insightful about the interactions between damage and chemical deteriorations.

Stora, E., E-mail: stora@univ-mlv.f [Atomic Energy Commission, CEA Saclay DEN/DANS/DPC/SCCME/Laboratoire d'Etude du Comportement des Betons et des Argiles, 91191 Gif sur Yvette (France); Universite Paris-Est, Laboratoire de Modelisation et Simulation Multiechelle, FRE3160 CNRS, 5 boulevard Descartes, 77454 Marne-la-Vallee Cedex 2 (France); Bary, B. [Atomic Energy Commission, CEA Saclay DEN/DANS/DPC/SCCME/Laboratoire d'Etude du Comportement des Betons et des Argiles, 91191 Gif sur Yvette (France); He, Q.-C. [Universite Paris-Est, Laboratoire de Modelisation et Simulation Multiechelle, FRE3160 CNRS, 5 boulevard Descartes, 77454 Marne-la-Vallee Cedex 2 (France); Deville, E.; Montarnal, P. [CEA Saclay DEN/DANS/DM2S/SFME/MTMS, 91191 Gif sur Yvette (France)

2010-08-15T23:59:59.000Z

214

Experience with CPV Module Failures at NREL (Presentation)  

SciTech Connect (OSTI)

The failures and performance issues associated with three years of on-sun testing of CPV modules are discussed. Pictures of various failure mechanisms and performance issues are presented. A wide array of CPV module failures and performance issues have been experienced at NREL. Many of the modules are prototypes and have not been through qualification testing. It is assumed that the qualification test would have captured many of the problems. Internal lens soiling due to condensation is not currently captured by the qualification test. Lens temperature dependence can be built into modeling if CPV is to operate in cold locations.

Muller, M.

2012-03-01T23:59:59.000Z

215

Hybrid approach to failure prediction for advanced computing systems |  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Hybrid approach to failure prediction for advanced computing systems Hybrid approach to failure prediction for advanced computing systems January 8, 2014 Tweet EmailPrint "Fault tolerance is no longer an option but a necessity," states Franck Cappello, project manager of research on resilience at the extreme scale at Argonne National Laboratory. "And the ability to reliably predict failures can significantly reduce the overhead of fault-tolerance strategies and the recovery cost." In a special issue article in the International Journal of High Performance Computing Applications, Cappello and his colleagues at Argonne and the University of Illinois at Urbana-Champaign (UIUC) discuss issues in failure prediction and present a new hybrid approach to overcome the limitations of current models. One popular way of building prediction models is to analyze log files,

216

Monte Carlo Modeling of Photon Interrogation Methods for Characterization of Special Nuclear Material  

SciTech Connect (OSTI)

This work illustrates a methodology based on photon interrogation and coincidence counting for determining the characteristics of fissile material. The feasibility of the proposed methods was demonstrated using a Monte Carlo code system to simulate the full statistics of the neutron and photon field generated by the photon interrogation of fissile and non-fissile materials. Time correlation functions between detectors were simulated for photon beam-on and photon beam-off operation. In the latter case, the correlation signal is obtained via delayed neutrons from photofission, which induce further fission chains in the nuclear material. An analysis methodology was demonstrated based on features selected from the simulated correlation functions and on the use of artificial neural networks. We show that the methodology can reliably differentiate between highly enriched uranium and plutonium. Furthermore, the mass of the material can be determined with a relative error of about 12%. Keywords: MCNP, MCNP-PoliMi, Artificial neural network, Correlation measurement, Photofission

Pozzi, Sara A [ORNL; Downar, Thomas J [ORNL; Padovani, Enrico [Nuclear Engineering Department Politecnico di Milano, Milan, Italy; Clarke, Shaun D [ORNL

2006-01-01T23:59:59.000Z

217

Estimation of Distributed Parameters in Permittivity Models of Composite Dielectric Materials Using  

E-Print Network [OSTI]

spectroscopy has been shown to have sensitivity to heat treated ceramic thermal barrier coatings, which Metric Framework, inorganic glass. 1 #12;1 Introduction Complex materials such as ceramic matrix

218

Physical understanding and modeling of chemical mechanical planarization in dielectric materials  

E-Print Network [OSTI]

Chemical mechanical planarization (CMP) has become the enabling planarization technique of choice for current and emerging silicon integrated circuit (IC) fabrication processes. This work studies CMP in dielectric materials ...

Xie, Xiaolin, Ph. D. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

219

Modeling VOC sorption of building materials and its impact on indoor air quality  

E-Print Network [OSTI]

Sorption of volatile organic compounds (VOCs) by building materials can have significant effect on the indoor VOC concentration levels and indoor air quality in buildings. The objective of this study was to investigate ...

Zhang, Jinsong, 1975-

2001-01-01T23:59:59.000Z

220

INSTITUTE OF PHYSICS PUBLISHING MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING Modelling Simul. Mater. Sci. Eng. 10 (2002) 119 PII: S0965-0393(02)55385-7  

E-Print Network [OSTI]

INSTITUTE OF PHYSICS PUBLISHING MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING in the two- dimensional case, it has been realized that the fundamental physical nature of dislocation 1 of the DD methodology to the more physical, yet, considerably more complex conditions of three

Ghoniem, Nasr M.

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Statistical analysis of cascading failures in power grids  

SciTech Connect (OSTI)

We introduce a new microscopic model of cascading failures in transmission power grids. This model accounts for automatic response of the grid to load fluctuations that take place on the scale of minutes, when optimum power flow adjustments and load shedding controls are unavailable. We describe extreme events, caused by load fluctuations, which cause cascading failures of loads, generators and lines. Our model is quasi-static in the causal, discrete time and sequential resolution of individual failures. The model, in its simplest realization based on the Directed Current description of the power flow problem, is tested on three standard IEEE systems consisting of 30, 39 and 118 buses. Our statistical analysis suggests a straightforward classification of cascading and islanding phases in terms of the ratios between average number of removed loads, generators and links. The analysis also demonstrates sensitivity to variations in line capacities. Future research challenges in modeling and control of cascading outages over real-world power networks are discussed.

Chertkov, Michael [Los Alamos National Laboratory; Pfitzner, Rene [Los Alamos National Laboratory; Turitsyn, Konstantin [Los Alamos National Laboratory

2010-12-01T23:59:59.000Z

222

Modeling most likely pathways for smuggling radioactive and special nuclear materials on a worldwide multi-modal transportation network  

SciTech Connect (OSTI)

Nuclear weapons proliferation is an existing and growing worldwide problem. To help with devising strategies and supporting decisions to interdict the transport of nuclear material, we developed the Pathway Analysis, Threat Response and Interdiction Options Tool (PATRIOT) that provides an analytical approach for evaluating the probability that an adversary smuggling radioactive or special nuclear material will be detected during transit. We incorporate a global, multi-modal transportation network, explicit representation of designed and serendipitous detection opportunities, and multiple threat devices, material types, and shielding levels. This paper presents the general structure of PATRIOT, all focuses on the theoretical framework used to model the reliabilities of all network components that are used to predict the most likely pathways to the target.

Saeger, Kevin J [Los Alamos National Laboratory; Cuellar, Leticia [Los Alamos National Laboratory

2010-10-28T23:59:59.000Z

223

Modeling most likely pathways for smuggling radioactive and special nuclear materials on a worldwide multimodal transportation network  

SciTech Connect (OSTI)

Nuclear weapons proliferation is an existing and growing worldwide problem. To help with devising strategies and supporting decisions to interdict the transport of nuclear material, we developed the Pathway Analysis, Threat Response and Interdiction Options Tool (PATRIOT) that provides an analytical approach for evaluating the probability that an adversary smuggling radioactive or special nuclear material will be detected during transit. We incorporate a global, multi-modal transportation network, explicit representation of designed and serendipitous detection opportunities, and multiple threat devices, material types, and shielding levels. This paper presents the general structure of PATRIOT, and focuses on the theoretical framework used to model the reliabilities of all network components that are used to predict the most likely pathways to the target.

Saeger, Kevin J [Los Alamos National Laboratory; Cuellar, Leticia [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

224

Exploring the usefulness of a simple linear regression model for understanding price movements of selected recycled materials in the UK  

Science Journals Connector (OSTI)

The price volatility of recycled materials exposes many different organisations to financial and regulatory risk. These risks can be partially mitigated by improved understanding of price volatility using econometric models, although these have tended to be sophisticated autoregressive models, beyond the analytical capability or cost structure of the average market participant. In this context, this study explores the use of a simple linear regression model to understand the behaviour of prices for recycled plastic, recovered paper and glass, based on the price of their primary inputs, with a specific focus on the UK market. The results of the simple regression model are compared with a wavelet analysis to determine what information is lost in the trade off with simplicity. Both models found significant relationships between the price of crude oil/ethylene/naphtha and recycled plastics and it appears that there is no loss in model performance by using oil as the explanatory variable, rather than direct inputs (ethylene/naphtha). However, few correlations were found for recovered paper and glass. Initial findings from the wavelet analysis suggest that since 2004 the oil price has become more closely linked to the price of recycled plastics. It must be noted that this study is exploratory and particular dynamics of UK markets for recycled materials may affect price development in a way that would not be repeated on international markets.

A. Angus; M. Rivas Casado; D. Fitzsimons

2012-01-01T23:59:59.000Z

225

Failure of anisotropic compressible shale  

SciTech Connect (OSTI)

The paper is dealing with a general, invariant, formulation of a failure condition for an anisotropic compressible rock. The invariant formulation is thought in conjunction with a general formulation of a viscoplastic constitutive equation for that rock, where this failure condition will play the role of {open_quotes}short-term{close_quotes} failure condition. The data available (due to H. Niandou and obtained at the laboratory LML Lille URA CNRS 1444 from France) were obtained in triaxial tests and provide the stress at failure for various orientations of the bedding planes with respect to the axial loading direction. We use the well known representation theorem according to which the failure function must depend not only on the invariants of the stress tensor, but also on the mixed invariants: tr M{sigma} and tr M{sigma}{sup 2}, where M = s{sub 1} {direct_product} s{sub 1} and s{sub 1} is the normal to the bedding plane. Using the data we first determine the form of the failure condition formulated in terms of stress invariants, for several orientations of the bedding planes with respect to the direction in which acts the main compressive stress, and which is defined by an angle 0. Then the coefficients of these failure conditions are made functions on this angle 0, which in turn is expressed as a function of the mixed invariants tr M{sigma}{prime} and II{sub {sigma}{prime}} (the second invariant of the stress deviator). All the coefficients involved in this generally formulated criterion are fully determined from the data.

Cazacu, O.; Cristescu, N.D. [Univ. of Flordia, Gainesville, FL (United States)

1995-12-31T23:59:59.000Z

226

Chipping fracture resistance of dental CAD/CAM restorative materials: Part 2. Phenomenological model and the effect of indenter type  

Science Journals Connector (OSTI)

Abstract The edge chipping resistances of six CAD/CAM dental restoration materials are analyzed and correlated to other mechanical properties. A new quadratic relationship that is based on a phenomenological model is presented. Objective The purpose of this study was to further analyze the edge chipping resistance of the brittle materials evaluated in Part 1. One objective was to determine why some force-distance trends were linear and others were nonlinear. A second objective was to account for differences in chipping resistance with indenter type. Methods Edge chipping experiments were conducted with different indenters, including some custom-made sharp conical indenters. A new force – distance quadratic expression was correlated to the data and compared to the linear and power law trends. Results The new quadratic function was an excellent fit in every instance. It can account for why some materials can be fit by a linear trend, while others can be fit by the power law trend. The effects of indenter type are accounted for variations in crack initiation and by the wedging stresses once an indentation hole is created. Significance The new quadratic force – edge distance function can be used with edge chipping data for all brittle materials, not just those evaluated in this study. The data trends vary from linear to nonlinear depending upon the material's hardness, fracture toughness, and elastic modulus.

G.D. Quinn; A.A. Giuseppetti; K.H. Hoffman

2014-01-01T23:59:59.000Z

227

Modeling and Characterization of the Magnetocaloric Effect in Ni2MnGa Materials  

SciTech Connect (OSTI)

Magnetic shape memory alloys have great promise as magneto-caloric effect refrigerant materials due to their combined magnetic and structural transitions. Computational and experimental research is reported on the Ni2MnGa material system. The magnetic states of this system have been explored using the Wang-Landau statistical approach in conjunction with the Locally Self-consistent Multiple-Scattering (LSMS) method to explore the magnetic states responsible for the magnet-caloric effect in this material. The effects of alloying agents on the transition temperatures of the Ni2MnGa alloy were investigated using differential scanning calorimetry (DSC) and superconducting quantum interference device (SQUID). Neutron scattering experiments were performed to observe the structural and magnetic phase transformations at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) on alloys of Ni-Mn-Ga and Ni-Mn-Ga-Cu-Fe. Data from the observations are discussed in comparison with the computational studies.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Rios, Orlando [ORNL; Hodges, Jason P [ORNL; Ludtka, Gerard Michael [ORNL; Porter, Wallace D [ORNL; Sefat, A. S. [Oak Ridge National Laboratory (ORNL); Rusanu, Aurelian [ORNL; Evans III, Boyd Mccutchen [ORNL

2012-01-01T23:59:59.000Z

228

Description of the Material Balance Model and Spreadsheet for Salt Dissolution  

SciTech Connect (OSTI)

The model employed to estimate the amount of inhibitors necessary for bearing water and dissolution water during the salt dissolution process is described. This model was inputed on a spreadsheet which allowed many different case studies to be performed. This memo describes the assumptions and equations which are used in the model, and documents the input and output cells of the spreadsheet. Two case studies are shown as examples of how the model may be employed.

Wiersma, B.J. [Westinghouse Savannah River Company, Aiken, SC (United States)

1994-10-12T23:59:59.000Z

229

JOINT ESTIMATION OF CARDIAC KINEMATICS AND MATERIAL PARAMETERS FROM NOISY IMAGING DATA AND UNCERTAIN MECHANICAL MODEL  

E-Print Network [OSTI]

AND UNCERTAIN MECHANICAL MODEL Huafeng Liu, Edward W.B. Lo, and Pengcheng Shi Biomedical Research Laboratory

Shi, Pengcheng

230

Model-Experimental Studies on Next-generation Li-ion Materials...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

More Documents & Publications Performance and Degradation Modeling of Batteries Improved Methods for Making Intermetallic Anodes Overview of Applied Battery Research...

231

Managing Critical Materials with a Technology-Specific Stocks and Flows Model  

Science Journals Connector (OSTI)

The scenarios detail the fleets of internal combustion engine vehicles (ICEVs), plug-in hybrid electric vehicles (PHEVs), and fully electric vehicles (EVs). ... The trade-off between higher efficiency component remanufacturing and reuse and the lower efficiency, more flexible material recycling, that allows materials to be recycled between different technologies and infrastructures, could be extended in such a study to the reuse of components between different infrastructures, such as EV batteries reused for grid-attached storage. ... Renewable energy technologies, necessary for low-carbon infrastructure networks, are being adopted to help reduce fossil fuel dependence and meet carbon mitigation targets. ...

Jonathan Busch; Julia K. Steinberger; David A. Dawson; Phil Purnell; Katy Roelich

2013-12-11T23:59:59.000Z

232

Modeling and Characterization of the Magnetocaloric Effect in Ni2MnGa Materials  

SciTech Connect (OSTI)

Magnetic shape memory alloys have great promise as magneto-caloric effect refrigerant materials due to their combined magnetic and structural transitions. Computational and experimental research is reported on the Ni2MnGa material system. The magnetic states of this system are explored using the Wang-Landau statistical approach in conjunction with the Locally Self-consistent Multiple-Scattering method. The effects of alloying agents on the transition temperatures of the Ni2MnGa alloy are investigated using differential scanning calorimetry and superconducting quantum interference device. Experiments are performed at the Spallation Neutron Source at Oak Ridge National Laboratory to observe the structural and magnetic phase transformations.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Shassere, Benjamin [ORNL; Rios, Orlando [ORNL; Hodges, Jason P [ORNL; Ludtka, Gerard Michael [ORNL; Porter, Wallace D [ORNL; Safa-Sefat, Athena [ORNL; Rusanu, Aurelian [ORNL; Brown, Greg [ORNL; Evans III, Boyd Mccutchen [ORNL

2014-01-01T23:59:59.000Z

233

Vehicle Technologies Office Merit Review 2014: Atomistic models of LMRNMC Materials  

Broader source: Energy.gov [DOE]

Presentation given by Argonne National Laboratory at 2014 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about atomistic models...

234

Sorption model of trichloroethylene (TCE) and benezene in municipal landfill materials.  

E-Print Network [OSTI]

??This research is intended to establish a mathematical model describing the mass transfer of trace gas in landfill. Experimental data used for calibration were reported… (more)

Chuang, Yuh-Lin

2012-01-01T23:59:59.000Z

235

Frequent Failures of Motor Shaft in Seawater Desalination Plant: Some Case Studies  

Science Journals Connector (OSTI)

This paper describes some recent case studies related to shaft failures in seawater desalination plants. The results of the systematic ... include environment, design, stresses, or poor selection of the materials

Anees U. Malik; Saleh A. Al-Fozan…

2013-04-01T23:59:59.000Z

236

Failure Stress and Apparent Elastic Modulus of Diesel Particulate Filter Ceramics  

Broader source: Energy.gov [DOE]

Three established mechanical test specimen geometries and test methods for brittle materials are adapted to DPF architecture to evaluate failure initiation stress and apparent elastic modulus of the ceramics.

237

Effects of soil-engineering properties on the failure mode of shallow landslides  

Science Journals Connector (OSTI)

Some landslides mobilize into flows, while others slide and deposit material immediately down slope. An index based on initial dry density and fine-grained content of soil predicted failure mode of 96 landslid...

Jonathan Peter McKenna; Paul Michael Santi; Xavier Amblard; Jacquelyn Negri

2012-06-01T23:59:59.000Z

238

Unsteady-state material balance model for a continuous rotary dissolver  

SciTech Connect (OSTI)

The unsteady-state continuous rotary dissolver material balance code (USSCRD) is a useful tool with which to study the performance of the rotary dissolver under a wide variety of operating conditions. The code does stepwise continuous material balance calculations around each dissolver stage and the digester tanks. Output from the code consists of plots and tabular information on the stagewise concentration profiles of UO{sub 2}, PuO{sub 2}, fission products, Pu(NO{sub 3}){sub 4}, UO{sub 2}(NO{sub 3}){sub 2}, fission product nitrates, HNO{sub 3}, H{sub 2}O, stainless steel, total particulate, and total fuel in pins. Other information about material transfers, stagewise liquid volume, material inventory, and dissolution performance is also provided. This report describes the development of the code, its limitations, key operating parameters, usage procedures, and the results of the analysis of several sets of operating conditions. Of primary importance in this work was the estimation of the steady-state heavy metal inventory in a 0.5-t/d dissolver drum. Values ranging from {similar_to}12 to >150 kg of U + Pu were obtained for a variety of operating conditions. Realistically, inventories are expected to be near the lower end of this range. Study of the variation of operating parameters showed significant effects on dissolver product composition from intermittent solids feed. Other observations indicated that the cycle times for the digesters and shear feed should be closely coupled in order to avoid potential problems with off-specification product. 19 references, 14 tables.

Lewis, B.E.

1984-09-01T23:59:59.000Z

239

Ultrafast Laser Diagnostics for Energetic-Material Ignition Mechanisms: Tools for Physics-Based Model Development.  

SciTech Connect (OSTI)

We present the results of an LDRD project to develop diagnostics to perform fundamental measurements of material properties during shock compression of condensed phase materials at micron spatial scales and picosecond time scales. The report is structured into three main chapters, which each focus on a different diagnostic devel opment effort. Direct picosecond laser drive is used to introduce shock waves into thin films of energetic and inert materials. The resulting laser - driven shock properties are probed via Ultrafast Time Domain Interferometry (UTDI), which can additionally be used to generate shock Hugoniot data in tabletop experiments. Stimulated Raman scattering (SRS) is developed as a temperature diagnostic. A transient absorption spectroscopy setup has been developed to probe shock - induced changes during shock compressio n. UTDI results are presented under dynamic, direct - laser - drive conditions and shock Hugoniots are estimated for inert polystyrene samples and for the explosive hexanitroazobenzene, with results from both Sandia and Lawrence Livermore presented here. SRS a nd transient absorption diagnostics are demonstrated on static thin - film samples, and paths forward to dynamic experiments are presented.

Kearney, Sean P.; Jilek, Brook Anton; Kohl, Ian Thomas; Farrow, Darcie; Urayama, Junji

2014-11-01T23:59:59.000Z

240

Analytical modeling of elastic-plastic wave behavior near grain boundaries in crystalline materials  

SciTech Connect (OSTI)

It is well known that changes in material properties across an interface will produce differences in the behavior of reflected and transmitted waves. This is seen frequently in planar impact experiments, and to a lesser extent, oblique impacts. In anisotropic elastic materials, wave behavior as a function of direction is usually accomplished with the aid of velocity surfaces, a graphical method for predicting wave scattering configurations. They have expanded this method to account for inelastic deformation due to crystal plasticity. The set of derived equations could not be put into a characteristic form, but instead led to an implicit problem. to overcome this difficulty an algorithm was developed to search the parameters space defined by a wave normal vector, particle velocity vector, and a wave speed. A solution was said to exist when a set from this parameter space satisfied the governing vector equation. Using this technique they can predict the anisotropic elastic-plastic velocity surfaces and grain boundary scattering configuration for crystalline materials undergoing deformation by slip. Specifically, they have calculated the configuration of scattered elastic-plastic waves in anisotropic NiAl for an incident compressional wave propagating along a <111> direction and contacting a 45 degree inclined grain boundary and found that large amplitude transmitted waves exist owing to the fact that the wave surface geometry forces it to propagate near the zero Schmid factor direction <100>.

Loomis, Eric [Los Alamos National Laboratory; Greenfield, Scott [Los Alamos National Laboratory; Luo, Shengnian [Los Alamos National Laboratory; Swift, Damian [LLNL; Peralta, Pedro [ASU

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Modeling and simulation of electronic structure, material interface and random doping in nano-electronic devices  

Science Journals Connector (OSTI)

The miniaturization of nano-scale electronic devices, such as metal oxide semiconductor field effect transistors (MOSFETs), has given rise to a pressing demand in the new theoretical understanding and practical tactic for dealing with quantum mechanical ... Keywords: Interface model, MOSFET, Mathematical modeling, Nano-electronic device, Poisson-Schrödinger equations, Quantum effects, Random dopant

Duan Chen; Guo-Wei Wei

2010-06-01T23:59:59.000Z

242

Project Profile: Predictive Physico-Chemical Modeling of Intrinsic Degradation Mechanisms for Advanced Reflector Materials  

Broader source: Energy.gov [DOE]

NREL, under the Physics of Reliability: Evaluating Design Insights for Component Technologies in Solar (PREDICTS) Program will be developing a physics-based computational degradation model to assess the kinetic oxidation rates; realistic model light attenuation and transport; and multi-layer treatment with variable properties Simulation based experimental design.

243

Promotion of Endodontic Lesions in Rats by a Novel Extraradicular Biofilm Model Using Obturation Materials  

Science Journals Connector (OSTI)

...Microbiology Promotion of Endodontic Lesions in Rats by a Novel Extraradicular Biofilm Model...in vivo extraradicular biofilm model in rats and to identify and quantify extraradicular...mandibular first molars of male Wistar rats to their oral environment. Four weeks...

Katsutaka Kuremoto; Yuichiro Noiri; Takuya Ishimoto; Naomichi Yoneda; Reiko Yamamoto; Hazuki Maezono; Takayoshi Nakano; Mikako Hayashi; Shigeyuki Ebisu

2014-04-18T23:59:59.000Z

244

Risk assessment of failure modes of gas diffuser liner of V94.2 siemens gas turbine by FMEA method  

Science Journals Connector (OSTI)

Failure of welding connection of gas diffuser liner and exhaust casing is one of the failure modes of V94.2 gas turbines which are happened in some power plants. This defect is one of the uncertainties of customers when they want to accept the final commissioning of this product. According to this, the risk priority of this failure evaluated by failure modes and effect analysis (FMEA) method to find out whether this failure is catastrophic for turbine performance and is harmful for humans. By using history of 110 gas turbines of this model which are used in some power plants, the severity number, occurrence number and detection number of failure determined and consequently the Risk Priority Number (RPN) of failure determined. Finally, critically matrix of potential failures is created and illustrated that failure modes are located in safe zone.

H Mirzaei Rafsanjani; A Rezaei Nasab

2012-01-01T23:59:59.000Z

245

Materials - Home  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

* Coatings & Lubricants * Coatings & Lubricants * Nanofluids * Deformation Joining * Recycling * Catalysts * Assessment * Illinois Center for Advanced Tribology Modeling, Simulation & Software Plug-In Hybrid Electric Vehicles PSAT Smart Grid Student Competitions Technology Analysis Transportation Research and Analysis Computing Center Working With Argonne Contact TTRDC Materials ring on liner reciprocating tester Tribology Lab: Ring-on-liner reciprocating tester. Argonne National Laboratory plays an important role in the Department of Energy's (DOE's) efforts to develop advanced materials for transportation. The materials are developed with DOE support from the EERE Office of Vehicle Technology and Office of Hydrogen, Fuel Cells, and Infrastructure Technologies in collaboration with worldwide industrial partners. Examples

246

Nonlinear Rate-Dependent Material Model with Damage and Plasticity from Granular Micromechanics Approach  

E-Print Network [OSTI]

based and ignores the effect of microstructural changes on the overall mechanical behavior. Therefore, to overcome the limitation of phenomenological based models, we utilize granular micromechanics approach in conjunction with thermo...

Singh, Viraj

2014-05-31T23:59:59.000Z

247

A Relation to Describe Rate-Dependent Material Failure  

Science Journals Connector (OSTI)

...field conditions. This is important to theory be-cause the term a 1 appears often...simplicity and ease of manipulation. Theory permits the deduction of time offailure...primary creep, based on rate process theory for constant stress and temperature...

BARRY VOIGHT

1989-01-13T23:59:59.000Z

248

Real-Time Quantitative Imaging of Failure Events in Materials...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ceramic matrix composites used in hostile environments such as in gas turbines and hypersonic flights has been a challenge. It is now shown that sequences of microcrack damage in...

249

Failure by fracture and fatigue in "NANO" and "BIO" materials  

E-Print Network [OSTI]

to cyclic fatigue and subcritical crack growth, micron-scalemoisture-assisted subcritical crack growth in this oxide

Ritchie, R.O.; Muhlstein, C.L.; Nalla, R.K.

2003-01-01T23:59:59.000Z

250

The derivation of structural usage profiles for vehicles from failure statistics  

Science Journals Connector (OSTI)

A methodology is presented to derive a statistical fatigue loading profile of the total population of users of a vehicle model, from failure data recorded on the same or a previous model. The method is based on fitting a bivariate probability density function on normalised failure data. This is radically more economic than existing methods. Reasonable accuracy could be achieved, even if the failures represent only a small fraction of the total population. The two-parameter usage profile determined in this way offers a powerful approach to predict failures or derive statistically based durability test or design requirements.

Johann Wannenburg; P. Stephan Heyns

2008-01-01T23:59:59.000Z

251

Controlling reactivity of nanoporous catalyst materials by tuning reaction product-pore interior interactions: Statistical mechanical modeling  

SciTech Connect (OSTI)

Statistical mechanical modeling is performed of a catalytic conversion reaction within a functionalized nanoporous material to assess the effect of varying the reaction product-pore interior interaction from attractive to repulsive. A strong enhancement in reactivity is observed not just due to the shift in reaction equilibrium towards completion but also due to enhanced transport within the pore resulting from reduced loading. The latter effect is strongest for highly restricted transport (single-file diffusion), and applies even for irreversible reactions. The analysis is performed utilizing a generalized hydrodynamic formulation of the reaction-diffusion equations which can reliably capture the complex interplay between reaction and restricted transport.

Wang, Jing [Ames Laboratory; Ackerman, David M. [Ames Laboratory; Lin, Victor S.-Y. [Ames Laboratory; Pruski, Marek [Ames Laboratory; Evans, James W. [Ames Laboratory

2013-04-02T23:59:59.000Z

252

A comparison of current models for nonlinear rate-dependent material behavior of crystalline solids  

E-Print Network [OSTI]

a ss 69 83 Fig. 16 Experimental constant strain rate tensile test response. 89 Fig. 17 Experimental creep test response. . . 91 Fig. 18 Graph of in(c ) v. in~a-a) for Krieg's i l model 93 Fig. 19 Graph of Y v. a for Bodner 's model. ~ . 97... as second order tensor s, they may be tensors of' other rank as well C13]. The method of Coleman and Noll L1 0] may be used to obtain the spatial and time distribution of the body force f. and the heat supply r from the conservation of linear 1...

Beek, Joachim Michael

1986-01-01T23:59:59.000Z

253

Modeling Different Failure Mechanisms in Metals  

E-Print Network [OSTI]

be expressed in the Voigt notation as (2.4) The effective plastic strain increment, , can be expressed as [86] (2.5) 16 where denotes the formal inverse of . is related to by [86] (2.6) Eqs. (2.3) and (2.5) provide an appropriate measure....10) Eq. (2.10) can be formally inverted to (2.11) Eq. (2.11) can be rewritten in terms of the principal components as (2.12) Assume the out-of-plane stresses to vanish. This implies that and , where denotes the mean stress. Eq. (2.12) can...

Zhang, Liang

2012-02-14T23:59:59.000Z

254

Progress In Electromagnetics Research B, Vol. 15, 197215, 2009 MODELING OF SHIELDING COMPOSITE MATERIALS  

E-Print Network [OSTI]

Progress In Electromagnetics Research B, Vol. 15, 197­215, 2009 MODELING OF SHIELDING COMPOSITE B. Archambeault IBM Co. Research Triangle Park, NC, USA Abstract--Composites containing conducting structures are studied, with both absorbing and reflecting composite layers. In this paper, fiber

Koledintseva, Marina Y.

255

The Transition-Zone Water Filter Model for Global Material Circulation: Where Do We Stand?  

E-Print Network [OSTI]

with a small melt fraction, highly incompatible elements including hydro- gen, helium and argon are sequestered the fraction of water is small. Models have been developed to understand the structure of a melt layer Hilst, et al., 1997]), then the whole mantle is depleted with only a small volume (~10%) of relatively

256

RELAP5 Model of a Two-phase ThermoSyphon Experimental Facility for Fuels and Materials Irradiation  

SciTech Connect (OSTI)

The High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) does not have a separate materials-irradiation flow loop and requires most materials and all fuel experiments to be placed inside a containment. This is necessary to ensure that internal contaminants such as fission products cannot be released into the primary coolant. As part of the safety basis justification, HFIR also requires that all experiments be able to withstand various accident conditions (e.g., loss of coolant) without generating vapor bubbles on the surface of the experiment in the primary coolant. As with any parallel flow system, HFIR is vulnerable to flow excursion events when vapor is generated in one of those flow paths. The effects of these requirements are to artificially increase experiment temperatures by introducing a barrier between the experimental materials and the HFIR coolant and to reduce experiment heat loads to ensure boiling doesn t occur. A new experimental facility for materials irradiation and testing in the HFIR is currently being developed to overcome these limitations. The new facility is unique in that it will have its own internal cooling flow totally independent of the reactor primary coolant and boiling is permitted. The reactor primary coolant will cool the outside of this facility without contacting the materials inside. The ThermoSyphon Test Loop (TSTL), a full scale prototype of the proposed irradiation facility to be tested outside the reactor, is being designed and fabricated (Ref. 1). The TSTL is a closed system working as a two-phase thermosyphon. A schematic is shown in Fig. 1. The bottom central part is the boiler/evaporator and contains three electric heaters. The vapor generated by the heaters will rise and be condensed in the upper condenser, the condensate will drain down the side walls and be circulated via a downcomer back into the bottom of the boiler. An external flow system provides coolant that simulates the HFIR primary coolant. The two-phase flow code RELAP5-3D (Ref. 2) is the main tool employed in this design. The model has multiple challenges: boiling, condensation and natural convection flows need to be modeled accurately.

Carbajo, Juan J [ORNL] [ORNL; McDuffee, Joel Lee [ORNL] [ORNL

2013-01-01T23:59:59.000Z

257

Near-Optimal Distributed Failure Circumscription  

E-Print Network [OSTI]

Small failures should only disrupt a small part of a network. One way to do this is by marking the surrounding area as untrustworthy --- circumscribing the failure. This can be done with a distributed algorithm using ...

Beal, Jacob

2003-08-11T23:59:59.000Z

258

Near-Optimal Distributed Failure Circumscription  

E-Print Network [OSTI]

Small failures should only disrupt a small part of a network. One wayto do this is by marking the surrounding area as untrustworthy ---circumscribing the failure. This can be done with a distributedalgorithm using ...

Beal, Jacob

2003-08-11T23:59:59.000Z

259

Systems Modeling of Chemical Hydride Hydrogen Storage Materials for Fuel Cell Applications  

SciTech Connect (OSTI)

A fixed bed reactor was designed, modeled and simulated for hydrogen storage on-board the vehicle for PEM fuel cell applications. Ammonia Borane (AB) was selected by DOE's Hydrogen Storage Engineering Center of Excellence (HSECoE) as the initial chemical hydride of study because of its high hydrogen storage capacity (up to {approx}16% by weight for the release of {approx}2.5 molar equivalents of hydrogen gas) and its stability under typical ambient conditions. The design evaluated consisted of a tank with 8 thermally isolated sections in which H2 flows freely between sections to provide ballast. Heating elements are used to initiate reactions in each section when pressure drops below a specified level in the tank. Reactor models in Excel and COMSOL were developed to demonstrate the proof-of-concept, which was then used to develop systems models in Matlab/Simulink. Experiments and drive cycle simulations showed that the storage system meets thirteen 2010 DOE targets in entirety and the remaining four at greater than 60% of the target.

Brooks, Kriston P.; Devarakonda, Maruthi N.; Rassat, Scot D.; Holladay, Jamelyn D.

2011-10-05T23:59:59.000Z

260

Solar Energy Materials & Solar Cells 92 (2008) 821829 Modeling the optical properties of WO3 and WO3SiO2 thin films  

E-Print Network [OSTI]

Solar Energy Materials & Solar Cells 92 (2008) 821­829 Modeling the optical properties of WO3 the optical response of the films in the near-UV and visible region: two interband transitions for energies E

Thirumalai, Devarajan

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

A cold model experimental study on the flow characteristics of bed material in a fluidized bed bottom ash cooler in a CFB boiler  

Science Journals Connector (OSTI)

A cold model experimental study on the flowing characteristics of bed material between a fluidized bed ash cooler and a furnace of CFB boiler were discussed in this paper. The research results showed that flowing...

Xiaofeng Lu; Yourong Li

2000-12-01T23:59:59.000Z

262

Modelling the softening within the fracture process zone associated with the fissuring mode of crack growth in Zr-2.5Nb CANDU pressure tube material  

Science Journals Connector (OSTI)

The fissuring mode of fracture in CANDU pressure tube material, and in particular Stage...J R curve) as observed in some irradiated compact toughness specimens has been investigated. Models are pr...

E. Smith; P. H. Davies

1996-02-15T23:59:59.000Z

263

Failure modes and mechanism of cleanroom garment  

Science Journals Connector (OSTI)

In order to provide a fundamental understanding of the cleanroom garment failure, we interviewed the manufacturers and...

Yujin Lee; Joo Hyung Hong; Jae Yong Lee; Ick Soo Kim; Hyungsup Kim

2012-03-01T23:59:59.000Z

264

Fracture behavior of W based materials. Final report  

SciTech Connect (OSTI)

This report describes the results of a program to investigate the fracture properties of tungsten based materials. In particular, the role of crack velocity on crack instability was determined in a W-Fe-Ni-Co ``heavy alloy`` and pure polycrystalline tungsten. A considerable effort was expended on the development of an appropriate crack velocity gage for use on these materials. Having succeeded in that, the gage technology was employed to determine the crack velocity response to the applied level of stress intensity factor at the onset of crack instability in pre-cracked specimens. The results were also correlated to the failure mode observed in two material systems of interest. Major results include: (1) unstable crack velocity measurements on metallic specimens which require high spatial resolution require the use of brittle, insulating substrates, as opposed to the ductile, polymer based substrates employed in low spatial resolution measurements; and (2) brittle failure modes, such as cleavage, are characterized by relatively slow unstable crack velocities while evidence of high degrees of deformation are associated with failures which proceed at high unstable crack velocities. This latter behavior is consistent with the predictions of the modeling of Hack et al and may have a significant impact on the interpretation of fractographs in general.

Hack, J.E. [Yale Univ., New Haven, CT (United States). Dept. of Mechanical Engineering

1991-09-30T23:59:59.000Z

265

The Heart Failure Bridge Clinic Quality  

E-Print Network [OSTI]

The Heart Failure Bridge Clinic Quality Improvement Project My project involved working with my mentor, Tasha Beck Freitag, CRNP, MPH, CHFN, and loosely with Deirdre Flowers, MSN-MPH, who is the heart failure case manager. The heart failure bridge clinic (HFBC), is a standalone clinic that was created

von der Heydt, Rüdiger

266

Modeling Metal Stocks and Flows: A Review of Dynamic Material Flow Analysis Methods  

Science Journals Connector (OSTI)

Remote sensing methods are used by Takahashi et al.,(86) who analyze in-use copper stocks using satellite nighttime light observation data. ... McMillan et al.(54) quantify the sensitivity of the lifetime distribution, recycling rate, and metallic recovery by using the Fourier Amplitude Sensitivity Test method, which provides a measure of input sensitivity defined as the fraction of total model variance. ... Yano, J.; Hirai, Y.; Okamoto, K.; Sakai, S.Dynamic flow analysis of current and future end-of-life vehicles generation and lead content in automobile shredder residue J. Mater. ...

Esther Müller; Lorenz M. Hilty; Rolf Widmer; Mathias Schluep; Martin Faulstich

2014-01-17T23:59:59.000Z

267

Continuous-Discontinuous Model for Ductile Fracture  

SciTech Connect (OSTI)

In this contribution, a continuum-dicontinuum model for ductile failure is presented. The degradation of material properties trough deformation is described by Continuum Damage Mechanics in a non-local integral formulation to avoid mesh dependence. In the final stage of failure, the damaged zone is replaced by a cohesive macro crack and subsequent traction-free macro crack for a more realistic representation of the phenomenon. The inclusion of the discontinuity surfaces is performed by the XFEM and Level Set Method and avoids the spurious damage growth typical of this class of models.

Seabra, Mariana R. R.; Cesar de Sa, Jose M. A. [IDMEC- FEUP University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto (Portugal)

2010-06-15T23:59:59.000Z

268

Dissimilar-metal weld failures in boiler tubing  

SciTech Connect (OSTI)

Both ferritic heat-resisting steels and austenitic stainless steels are used for fossil-fired boilers for central power stations. The use of these two different types of materials within the system leads to the need for a dissimilar-metal weld transition joint. Increased cyclic operation of boilers has led to a rash of failures in welds between dissimilar metals; studies have identified the causes, and improved nondestructive testing techniques permit early identification of problem areas.

Klueh, R.L.

1984-02-01T23:59:59.000Z

269

GROUND PLANE INSULATION FAILURE IN THE FIRST TPC SUPERCONDUCTING COIL  

E-Print Network [OSTI]

is WIUUTEO GROUND PLANE INSULATION FAILURE IN THE FIRST TPCOn August 27, 1980, an insulation failure occurred dt-ringby a failure uf ground plane insulation. ACKNOWLEDGMENTS The

Green, M.A.

2010-01-01T23:59:59.000Z

270

Power Grid Defense Against Malicious Cascading Failure  

E-Print Network [OSTI]

An adversary looking to disrupt a power grid may look to target certain substations and sources of power generation to initiate a cascading failure that maximizes the number of customers without electricity. This is particularly an important concern when the enemy has the capability to launch cyber-attacks as practical concerns (i.e. avoiding disruption of service, presence of legacy systems, etc.) may hinder security. Hence, a defender can harden the security posture at certain power stations but may lack the time and resources to do this for the entire power grid. We model a power grid as a graph and introduce the cascading failure game in which both the defender and attacker choose a subset of power stations such as to minimize (maximize) the number of consumers having access to producers of power. We formalize problems for identifying both mixed and deterministic strategies for both players, prove complexity results under a variety of different scenarios, identify tractable cases, and develop algorithms f...

Shakarian, Paulo; Lindelauf, Roy

2014-01-01T23:59:59.000Z

271

An Instability Leading to Failure of Polyethylene in Uniaxial Creep  

E-Print Network [OSTI]

An Instability Leading to Failure of Polyethylene in Uniaxial Creep L. J. ZAPAS and J. M. CRISSMAN model, a point of instability is pre- dicted for the uniaxial creep of high density polyethylene. From dead load experiments it has been found that the instabil- ity occurs for linear -polyethylene

272

Queueing systems subject to random server failures: an approximation  

E-Print Network [OSTI]

In the traditional study of queueing theory, a typical ics. assumption is that the server is not subject to failures. This assumption, however, is not realistic for modeling many queueing systems in practice. Since the late 1950's, there has been...

Matis, Timothy

1998-01-01T23:59:59.000Z

273

Theory and numerical modeling of the accelerated expansion of laser-ablated materials near a solid surface  

Science Journals Connector (OSTI)

A self-similar theory and numerical hydrodynamic modeling is developed to investigate the effects of dynamic source and partial ionization on the acceleration of the unsteady expansion of laser-ablated material near a solid target surface. The dynamic source effect accelerates the expansion in the direction perpendicular to the target surface, while the dynamic partial ionization effect accelerates the expansion in all directions. The vaporized material during laser ablation provides a nonadiabatic dynamic source at the target surface into the unsteady expanding fluid. For studying the dynamic source effect, the self-similar theory begins with an assumed profile of plume velocity, u=v/vm=?+(1-?)?, where vm is the maximum expansion velocity, ? is a constant, and ?=x/vmt. The resultant profiles of plume density and plume temperature are derived. The relations obtained from the conservations of mass, momentum, and energy, respectively, all show that the maximum expansion velocity is inversely proportional to ?, where 1-? is the slope of plume velocity profile. The numerical hydrodynamic simulation is performed with the Rusanov method and the Newton Raphson method. The profiles and scalings obtained from numerical hydrodynamic modeling are in good agreement with the theory. The dynamic partial ionization requires ionization energy from the heat at the expansion front, and thus reduces the increase of front temperature. The reduction of thermal motion would increase the flow velocity to conserve the momentum. This dynamic partial ionization effect is studied with the numerical hydrodynamic simulation including the Saha equation. With these effects, ? is reduced from its value of conventional free expansion. This reduction on ? increases the flow velocity slope, decreases the flow velocity near the surface, and reduces the thermal motion of plume, such that the maximum expansion velocity is significantly increased over that found from conventional models. The result may provide an explanation for experimental observations of high-expansion front velocities even at low-laser fluence.

K. R. Chen; T. C. King; J. H. Hes; J. N. Leboeuf; D. B. Geohegan; R. F. Wood; A. A. Puretzky; J. M. Donato

1999-09-15T23:59:59.000Z

274

Blasting of the Twin Creek`s highwall failure  

SciTech Connect (OSTI)

On December 26, 1994, at 1:00 a.m., the Twin Creeks Mine experienced a major highwall failure involving over 2.5 million tons. The long chain of events that led up to this failure actually started in late August when a truck driver first noticed the cracks in the highwall. Soon after, an intense survey prism monitoring program was initiated. An electronic, continuous monitor linked to Dispatch was soon in place which monitored the crack that was most likely to fail into the active pit area first. It wasn`t until early December when the graphs started showing greater increases in movement. On December 22, the acceleration curves skied-out. The 600 ft. highwall finally collapsed about three days later and left material spread 800 ft. across the bottom of the pit. Not knowing if the large overhangs above the slide would soon give away sending more material into the pit or if the numerous tension cracks on the surface would result in yet another major failure, it was only after restoring the rigid monitoring program and observing no movement that the company decided to drill and blast the overhanging material. The purpose of the blast wasn`t to cast the material into the pit, but to kick-out the toe so that the weight of material above would fall upon itself. After two months of preparation and almost three weeks of drilling and loading, the shot occurred on March 21, 1995. Approximately one million tons were successfully blasted that day, and presently they have completed mining the slough material itself and reestablished benches from the top.

Gray, C.J.; Bachmann, J.A. [Santa Fe Pacific Gold Corp., Winnemucca, NV (United States). Twin Creeks Mine

1996-12-01T23:59:59.000Z

275

Fracture of brittle multiphase materials by high energy water jets  

Science Journals Connector (OSTI)

High energy water jets are established in processing brittle, inhomogeneous materials like rocks and concrete. Despite their wide ... of application, the failure mechanisms of these materials, especially the infl...

A. Momber; R. Kovacevic

1996-02-15T23:59:59.000Z

276

An Automatic Failure Mode and Effect Analysis Technique for Processes Defined in the Little-JIL  

E-Print Network [OSTI]

Failure Mode and Effect Analysis (FMEA) information from processes modeled in the Little-JIL process definition language. Typically FMEA information is created manually by skilled experts, an approach this definition can then be used to create FMEA representations for a wide range of potential failures

Avrunin, George S.

277

Explaining Recent Connecticut Bank Failures: Did Managerial Inefficiency Play a Role  

E-Print Network [OSTI]

Explaining Recent Connecticut Bank Failures: Did Managerial Inefficiency Play a Role Stephen M. Miller The University of Connecticut and Athanasios G. Noulas* University of Macedonia August 1998 important questions about bank performance. We develop a failure-prediction model for Connecticut banks

Ahmad, Sajjad

278

Original article Increased late sodium current in myocytes from a canine heart failure  

E-Print Network [OSTI]

Original article Increased late sodium current in myocytes from a canine heart failure model and from failing human heart Carmen R. Valdivia, William W. Chu, Jielin Pu 1 , Jason D. Foell, Robert A December 2004 Abstract Electrophysiological remodeling of ion channels in heart failure causes action

Kamp, Tim

279

Geothermal steam muffler diffusers: the Geysers, California. Failure analysis report  

SciTech Connect (OSTI)

The primary failure mechanism for the T304 diffusers was chloride induced stress corrosion cracking (sec.) Once SCC had progressed to a certain point, high cycle corrosion/fatigue proceeded to the final fracture. Alteration of the environment to prevent SCC is not feasible. The existing environment will also cause sulfide stress cracking (SSC) in susceptible materials; therefore, alternate materials must resist SSC as well as SCC. The very large amplitude operational stresses make heat treatment to relieve residual fabrication stress questionable for the prevention of SCC. (MHR)

McAlpin, R.; Ellis, P.F. II

1980-04-01T23:59:59.000Z

280

Rate dependent shear failure and the scaling effect in long rod penetration  

Science Journals Connector (OSTI)

Long rod penetration tests show a scaling effect that cannot be explained by rate dependent strength. We propose here that this scaling effect may be explained by rate dependent failure. We start by revisiting the well known result that long rod penetration efficiency depends on strain to failure of both projectile and target materials. We then make the strain to failure depend on strain rate, using the overstress concept. In this way the effective strain to failure increases with strain rate. As strain rate increases with decreasing scale, we get that penetration efficiency decreases with decreasing scale, as observed in tests. In the paper we show results of hydrocode runs that demonstrate the relation between strain rate sensitivity of strain to failure and the scaling effect in long rod penetration.

Y Partom

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Global Failure Criteria for SOFC Positive/Electrolyte/Negative (PEN) Structure  

SciTech Connect (OSTI)

Due to the mismatch of thermal expansion coefficients (TEC) of the various layer materials in SOFC, the internal stresses are unavoidable under temperature differential. In order to create the reliable cell and stack of solid oxide fuel cell (SOFC), it is necessary to develop a failure criterion for SOFC PEN structures for the initial failures occurred during cell/stack assembly. In this paper, a global failure criterion is developed for the initial design against mechanical failure of the PEN structure in high temperature SOFCs. The relationship of the critical energy release rate and critical curvature and maximum displacement of the warpage of the cells caused by the temperature differential is established so that the failure reliability of SOFC PEN structures may be determined by the measurement of the curvature and displacement of the warpaged cells.

Liu, Wenning N.; Sun, Xin; Khaleel, Mohammad A.; Qu, Jianmin

2007-04-01T23:59:59.000Z

282

Test to Determine Margin-to-Failure for Hy-100 Steel with Undermatched Welds  

SciTech Connect (OSTI)

This test program was undertaken to determine the flaw tolerance and to quantify the strength margin-to-failure of high yield strength steel fillet welded specimens. The tests demonstrate adequate margin-to-failure for HY-100 specimens fabricated with matched welding systems. In the use of high yield (HY) steel materials in designs required to accommodate rapidly applied dynamic loads, the concern was raised where the possibility of decreased flaw tolerance and premature failure by unstable ductile tearing could limit their use. Tests were developed and conducted to demonstrate adequate margin-to-failure in HY-100 fillet and partial penetration welded structures. In addition, inelastic analytical predictions were performed to assess the accuracy of such predictive tools compared to actual test data. Results showed that adequate margin-to-failure exists when using matched welding systems.

K.R. Arpin; T.F. Trimble

2003-04-01T23:59:59.000Z

283

Continuum–discontinuum analysis of failure mechanisms around unsupported circular excavations in anisotropic clay shales  

Science Journals Connector (OSTI)

Abstract The stability of circular excavations in clay shales is a key issue in the drilling and tunnelling industries as well as in the field of deep geological waste storage. A large body of experimental evidence indicates that the damaged zone around these cavities is influenced by strong mechanical anisotropy induced by the layered material structure. The vast majority of numerical models adopted to date to analyse the stability of openings in layered rocks have been based on continuum mechanics principles using classic shear failure theory for elasto-plastic materials. However, a number of experimental observations demonstrate that clay shales may fail in a brittle manner under low-confinement conditions such as those characterizing the near-field of the excavation. Therefore, an alternative numerical approach based on non-linear fracture mechanics principles and the discrete element method is adopted to gain new insight into the failure process of this class of geomaterials. In order to account for the influence of clay shale microstructure on its mechanical behaviour a newly developed approach to capture the anisotropy of strength is proposed. With this numerical approach, the cohesive strength parameters of the fracture model are assumed to be a function of the relative orientation between the element bonds and the layering orientation. The effectiveness of the numerical technique is quantitatively demonstrated by simulating standard rock mechanics tests on an indurated claystone, namely Opalinus Clay. Emergent strength and deformation properties, together with the simulated fracture mechanisms, are shown to be in good agreement with experimental observations. The modelling technique is then applied to the simulation of the Excavation Damaged Zone (EDZ) around a circular tunnel in horizontally bedded Opalinus Clay. The simulated fracturing process is mainly discussed in the context of the damage mechanisms observed at the Mont Terri URL. Furthermore, the influence of in situ stress on resulting EDZ geometry is analysed together with possible implications for ground support and tunnel constructability. Modelling results highlight the importance of shear strength mobilization along bedding planes in controlling the EDZ formation process. In particular, slippage of bedding planes is shown to cause rock mass deconfinement which in turn promotes brittle failure processes in the form of spalling. The numerical technique is currently limited to two-dimensional analyses without any thermo-hydro-mechanical coupling.

A. Lisjak; G. Grasselli; T. Vietor

2014-01-01T23:59:59.000Z

284

Preprint of the article published in Solid State Phenom. 129 (2007), pp. 51-58. Cluster dynamics modeling of materials: advantages and limitations.  

E-Print Network [OSTI]

describing the primary damage under irradiation, by nature heterogeneous in space and time, is tricky to introduce especially when displacement cascades are produced. Introduction. In material science, cluster models In these models, the system is seen as a gas of clusters made of monomers that can be solute atoms

Paris-Sud XI, Université de

285

"giant faults" does not lead to total failure, because the displacement equivalent to the fault  

E-Print Network [OSTI]

"giant faults" does not lead to total failure, because the displacement equivalent to the fault changes in physical properties by cold working seen in Fig. 1 are attributed to this accumulated nanoscale as supporting material on Science Online. 5. T. W. Duerig, A. R. Pelton, in Materials Properties Handbook

Rubloff, Gary W.

286

WAXS fat subtraction model to estimate differential linear scattering coefficients of fatless breast tissue: Phantom materials evaluation  

SciTech Connect (OSTI)

Purpose: Develop a method to subtract fat tissue contributions to wide-angle x-ray scatter (WAXS) signals of breast biopsies in order to estimate the differential linear scattering coefficients ?{sub s} of fatless tissue. Cancerous and fibroglandular tissue can then be compared independent of fat content. In this work phantom materials with known compositions were used to test the efficacy of the WAXS subtraction model. Methods: Each sample 5 mm in diameter and 5 mm thick was interrogated by a 50 kV 2.7 mm diameter beam for 3 min. A 25 mm{sup 2} by 1 mm thick CdTe detector allowed measurements of a portion of the ? = 6° scattered field. A scatter technique provided means to estimate the incident spectrum N{sub 0}(E) needed in the calculations of ?{sub s}[x(E, ?)] where x is the momentum transfer argument. Values of ?{sup ¯}{sub s} for composite phantoms consisting of three plastic layers were estimated and compared to the values obtained via the sum ?{sup ¯}{sub s}{sup ?}(x)=?{sub 1}?{sub s1}(x)+?{sub 2}?{sub s2}(x)+?{sub 3}?{sub s3}(x), where ?{sub i} is the fractional volume of the ith plastic component. Water, polystyrene, and a volume mixture of 0.6 water + 0.4 polystyrene labelled as fibphan were chosen to mimic cancer, fat, and fibroglandular tissue, respectively. A WAXS subtraction model was used to remove the polystyrene signal from tissue composite phantoms so that the ?{sub s} of water and fibphan could be estimated. Although the composite samples were layered, simulations were performed to test the models under nonlayered conditions. Results: The well known ?{sub s} signal of water was reproduced effectively between 0.5 < x < 1.6 nm{sup ?1}. The ?{sup ¯}{sub s} obtained for the heterogeneous samples agreed with ?{sup ¯}{sub s}{sup ?}. Polystyrene signals were subtracted successfully from composite phantoms. The simulations validated the usefulness of the WAXS models for nonlayered biopsies. Conclusions: The methodology to measure ?{sub s} of homogeneous samples was quantitatively accurate. Simple WAXS models predicted the probabilities for specific x-ray scattering to occur from heterogeneous biopsies. The fat subtraction model can allow ?{sub s} signals of breast cancer and fibroglandular tissue to be compared without the effects of fat provided there is an independent measurement of the fat volume fraction ?{sub f}. Future work will consist of devising a quantitative x-ray digital imaging method to estimate ?{sub f} in ex vivo breast samples.

Tang, Robert Y., E-mail: rx-tang@laurentian.ca [Biomolecular Sciences Program, Laurentian University, 935 Ramsey Lake Road, Sudbury, Ontario P3E 2C6 (Canada); Laamanen, Curtis, E-mail: cx-laamanen@laurentian.ca; McDonald, Nancy, E-mail: mcdnancye@gmail.com [Department of Physics, Laurentian University, 935 Ramsey Lake Road, Sudbury, Ontario P3E 2C6 (Canada)] [Department of Physics, Laurentian University, 935 Ramsey Lake Road, Sudbury, Ontario P3E 2C6 (Canada); LeClair, Robert J., E-mail: rleclair@laurentian.ca [Department of Physics, Laurentian University, 935 Ramsey Lake Road, Sudbury, Ontario P3E 2C6, Canada and Biomolecular Sciences Program, Laurentian University, 935 Ramsey Lake Road, Sudbury, Ontario P3E 2C6 (Canada)

2014-05-15T23:59:59.000Z

287

Contact method to allow benign failure in ceramic capacitor having self-clearing feature  

DOE Patents [OSTI]

A capacitor exhibiting a benign failure mode has a first electrode layer, a first ceramic dielectric layer deposited on a surface of the first electrode, and a second electrode layer disposed on the ceramic dielectric layer, wherein selected areas of the ceramic dielectric layer have additional dielectric material of sufficient thickness to exhibit a higher dielectric breakdown voltage than the remaining majority of the dielectric layer. The added thickness of the dielectric layer in selected areas allows lead connections to be made at the selected areas of greater dielectric thickness while substantially eliminating a risk of dielectric breakdown and failure at the lead connections, whereby the benign failure mode is preserved.

Myers, John D.; Taylor, Ralph S.

2012-06-26T23:59:59.000Z

288

Materialism and materiality  

Science Journals Connector (OSTI)

Accountants and auditors in recent financial scandals have been pictured as materialistic, simply calculating consequences and ignoring duties. This paper potentially explains this apparently materialistic behaviour in what has historically been a truthtelling profession. Materiality, which drives audit priorities, has been institutionalised in accounting and auditing standards. But a materiality focus inherently implies that all amounts that are not 'materially' misstated are equally true. This leads to habitual immaterial misstatements and promotes the view that auditors do not care about truth at all. Auditors' lack of commitment to truth undermines their claim to be professionals in the classic sense.

Michael K. Shaub

2005-01-01T23:59:59.000Z

289

Failure-aware resource provisioning for hybrid Cloud infrastructure  

Science Journals Connector (OSTI)

Hybrid Cloud computing is receiving increasing attention in recent days. In order to realize the full potential of the hybrid Cloud platform, an architectural framework for efficiently coupling public and private Clouds is necessary. As resource failures due to the increasing functionality and complexity of hybrid Cloud computing are inevitable, a failure-aware resource provisioning algorithm that is capable of attending to the end-users quality of service (QoS) requirements is paramount. In this paper, we propose a scalable hybrid Cloud infrastructure as well as resource provisioning policies to assure QoS targets of the users. The proposed policies take into account the workload model and the failure correlations to redirect users’ requests to the appropriate Cloud providers. Using real failure traces and a workload model, we evaluate the proposed resource provisioning policies to demonstrate their performance, cost as well as performance–cost efficiency. Simulation results reveal that in a realistic working condition while adopting user estimates for the requests in the provisioning policies, we are able to improve the users’ QoS about 32% in terms of deadline violation rate and 57% in terms of slowdown with a limited cost on a public Cloud.

Bahman Javadi; Jemal Abawajy; Rajkumar Buyya

2012-01-01T23:59:59.000Z

290

Numerical modelling of sandstone uniaxial compression test using a mix-mode cohesive fracture model  

E-Print Network [OSTI]

A mix-mode cohesive fracture model considering tension, compression and shear material behaviour is presented, which has wide applications to geotechnical problems. The model considers both elastic and inelastic displacements. Inelastic displacement comprises fracture and plastic displacements. The norm of inelastic displacement is used to control the fracture behaviour. Meantime, a failure function describing the fracture strength is proposed. Using the internal programming FISH, the cohesive fracture model is programmed into a hybrid distinct element algorithm as encoded in Universal Distinct Element Code (UDEC). The model is verified through uniaxial tension and direct shear tests. The developed model is then applied to model the behaviour of a uniaxial compression test on Gosford sandstone. The modelling results indicate that the proposed cohesive fracture model is capable of simulating combined failure behaviour applicable to rock.

Gui, Yilin; Kodikara, Jayantha

2015-01-01T23:59:59.000Z

291

Failure modes and effects analysis of fusion magnet systems  

SciTech Connect (OSTI)

A failure modes and consequence analysis of fusion magnet system is an important contributor towards enhancing the design by improving the reliability and reducing the risk associated with the operation of magnet systems. In the first part of this study, a failure mode analysis of a superconducting magnet system is performed. Building on the functional breakdown and the fault tree analysis of the Toroidal Field (TF) coils of the Next European Torus (NET), several subsystem levels are added and an overview of potential sources of failures in a magnet system is provided. The failure analysis is extended to the Poloidal Field (PF) magnet system. Furthermore, an extensive analysis of interactions within the fusion device caused by the operation of the PF magnets is presented in the form of an Interaction Matrix. A number of these interactions may have significant consequences for the TF magnet system particularly interactions triggered by electrical failures in the PF magnet system. In the second part of this study, two basic categories of electrical failures in the PF magnet system are examined: short circuits between the terminals of external PF coils, and faults with a constant voltage applied at external PF coil terminals. An electromagnetic model of the Compact Ignition Tokamak (CIT) is used to examine the mechanical load conditions for the PF and the TF coils resulting from these fault scenarios. It is found that shorts do not pose large threats to the PF coils. Also, the type of plasma disruption has little impact on the net forces on the PF and the TF coils. 39 refs., 30 figs., 12 tabs.

Zimmermann, M; Kazimi, M S; Siu, N O; Thome, R J

1988-12-01T23:59:59.000Z

292

FMEA (Failure Mode and Effects Analysis)  

Science Journals Connector (OSTI)

FMEA (Failure Mode and Effects Analysis; Fehlermöglichkeits- und Einflussanalyse) als universelles Methodenmodell folgt dem Grundgedanken einer präventiven Fehlervermeidung anstelle einer nachsorgenden Fehler...

A. Göbel

2014-01-01T23:59:59.000Z

293

ADVANCED COMPOSITE MATERIALS TECHNOLOGY FOR ROTORCRAFT Andrew Makeev*, University of Texas at Arlington, Arlington, Texas, USA  

E-Print Network [OSTI]

ADVANCED COMPOSITE MATERIALS TECHNOLOGY FOR ROTORCRAFT Andrew Makeev*, University of Texas, Patz Materials & Technologies, Benicia, CA, USA Abstract Composite materials are increasingly used. In polymer-matrix composite structures, matrix-dominated failures impose severe limitations on structural

Texas at Arlington, University of

294

Eliciting a human understandable model of ice adhesion strength for rotor blade leading edge materials from uncertain experimental data  

E-Print Network [OSTI]

on the thermal conductivity of isotropic materials that protect the leading edge of the blade from erosion. For this reason, electro-thermal de-icing is not ideal for new high erosion resistant polymer based leading edge protec- tion materials because they have lower thermal conductivity than isotropic materials. Due

Granada, Universidad de

295

Phase Separations in LiFe1–xMnxPO4: A Random Stack Model for Efficient Cathode Materials  

Science Journals Connector (OSTI)

Lithium transition metal phosphates are of interest as storage cathodes for rechargeable Li batteries because of their high energy d., low raw materials cost, environmental friendliness and safety. ... The former material, proven to be very promising as active cathode material in Li metal and Li-ion batteries, was synthesized through a new procedure that combines a simple sol-gel pptn. ...

Weifeng Huang; Shi Tao; Jing Zhou; Cheng Si; Xing Chen; Wei Huang; Chuanhong Jin; Wangsheng Chu; Li Song; Ziyu Wu

2013-12-20T23:59:59.000Z

296

Old Electrochromic Materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Electrochromic Materials Electrochromic Materials DOE also supports the development of electrochromic coatings through several mechanisms. Three companies are engaged in development of commercial prototypes through the Electrochromics Initiative and an SBIR small business grant. LBNL and another DOE laboratory, the National Renewable Energy Laboratory (NREL) perform a variety of measurements to evaluate the energy performance and durability of these prototypes . Other research activities are intended to assist the efforts of the industry in general. At LBNL, research focuses on rapid development and analysis of electrode materials. Among recent accomplishments was the production of a stoichiometric form of Li0.5Ni0.5O by laser deposition and sputtering with excellent electrochromic properties. Dr. Stuart Cogan of EIC Laboratories tested the films and declared them to have "the highest coloration efficiency of any known anodic electrochromic material." EIC will test the films in their own devices in the near future. We also work on several binary electrodes produced by cosputtering from two targets simultaneously. For example, enhanced forms of tungsten oxide produced in this way have wide application because of the prevalence of tungsten oxide in today's devices. In addition to testing durability, NREL also investigates the degradation mechanisms which lead to failure in the hope of being able to correlate accelerated testing to real time failure as well as to diagnose and correct device problems.

297

Towards Task-Oriented User Support for Failure Mode and Effects Analysis  

Science Journals Connector (OSTI)

Failure mode and effects analysis (FMEA) is an important method for preventive quality ... her work organized; (2) to improve FMEA results by providing suitable evaluation functions; and ... explicit model of the...

Gerhard Peter; Dietmar Rösner

1999-01-01T23:59:59.000Z

298

Risk evaluation in failure mode and effects analysis using fuzzy digraph and matrix approach  

Science Journals Connector (OSTI)

Failure mode and effects analysis (FMEA) is a widely used engineering technique for ... imprecisely evaluation. In this article, a new FMEA model based on fuzzy digraph and matrix ... problems and improve the eff...

Hu-Chen Liu; Yi-Zeng Chen; Jian-Xin You; Hui Li

2014-05-01T23:59:59.000Z

299

E-Print Network 3.0 - acute cardiac failure Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

cardiac failure Page: << < 1 2 3 4 5 > >> 1 Workshop on Multi-scale Modelling of the Heart 27-29 March 2008, Auckland, New Zealand Summary: + signalling 10:40- 11:05 Overview...

300

UTILITIES PROBLEMS AND FAILURES Electrical or plumbing failure/Flooding/Water leak/Natural gas or  

E-Print Network [OSTI]

UTILITIES PROBLEMS AND FAILURES Electrical or plumbing failure/Flooding/Water leak/Natural gas or a generator? NOTIFY the University Police. FOLLOW evacuation procedures. NOTIFY Building Safety personnel

Fernandez, Eduardo

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

UTILITIES PROBLEMS AND FAILURES Electrical or plumbing failure/Flooding/Water leak/Natural gas  

E-Print Network [OSTI]

UTILITIES PROBLEMS AND FAILURES Electrical or plumbing failure/Flooding/Water leak/Natural gas. . What should I do if the if the building does not have emergency lighting or a generator? NOTIFY

Fernandez, Eduardo

302

FAILURE DISCRIMINATION BY SEMI-DEFINITE PROGRAMMING  

E-Print Network [OSTI]

mining approach to cancer diagnosis [12], applied the same idea to failure discrimination for failure discriminant analysis, a classical and yet very actively studied problem in financial engineering, data-mining, support vector machine 1. Introduction Quantitative analysis of credit risk attracted more

Uryasev, Stanislav

303

Beyond Success and Failure Sandro Etalle  

E-Print Network [OSTI]

Beyond Success and Failure Sandro Etalle Dept. of Computer Science, Universiteit Maastricht P based on logic programming where success and failure are replaced by predicates for adequacy of the selection rule does not hold. We show that, under certain conditions, whenever there exists an adequate

van Raamsdonk, Femke

304

CLINICAL RESEARCH Heart failure/cardiomyopathy  

E-Print Network [OSTI]

RESEARCH Heart failure/cardiomyopathy Preserved left ventricular twist and circumferential deformation, but depressed longitudinal and radial deformation in patients with diastolic heart failure Jianwen Wang, Dirar SBakey Heart Center, The Methodist Hospital, Houston, TX 77030-2717, USA Received 27 September 2007; revised 15

Duncan, James S.

305

MEMS Reliability: Infrastructure, Test Structures, Experiments, and Failure Modes  

SciTech Connect (OSTI)

The burgeoning new technology of Micro-Electro-Mechanical Systems (MEMS) shows great promise in the weapons arena. We can now conceive of micro-gyros, micro-surety systems, and micro-navigators that are extremely small and inexpensive. Do we want to use this new technology in critical applications such as nuclear weapons? This question drove us to understand the reliability and failure mechanisms of silicon surface-micromachined MEMS. Development of a testing infrastructure was a crucial step to perform reliability experiments on MEMS devices and will be reported here. In addition, reliability test structures have been designed and characterized. Many experiments were performed to investigate failure modes and specifically those in different environments (humidity, temperature, shock, vibration, and storage). A predictive reliability model for wear of rubbing surfaces in microengines was developed. The root causes of failure for operating and non-operating MEMS are discussed. The major failure mechanism for operating MEMS was wear of the polysilicon rubbing surfaces. Reliability design rules for future MEMS devices are established.

TANNER,DANELLE M.; SMITH,NORMAN F.; IRWIN,LLOYD W.; EATON,WILLIAM P.; HELGESEN,KAREN SUE; CLEMENT,J. JOSEPH; MILLER,WILLIAM M.; MILLER,SAMUEL L.; DUGGER,MICHAEL T.; WALRAVEN,JEREMY A.; PETERSON,KENNETH A.

2000-01-01T23:59:59.000Z

306

LX-17 Corner-Turning and Reactive Flow Failure  

SciTech Connect (OSTI)

We have performed a series of highly-instrumented experiments examining corner-turning of detonation. A TATB booster is inset 15 mm into LX-17 (92.5% TATB, 7.5% kel-F) so that the detonation must turn a right angle around an air well. An optical pin located at the edge of the TATB gives the start time of the corner-turn. The breakout time on the side and back edges is measured with streak cameras. Three high-resolution X-ray images were taken on each experiment to examine the details of the detonation. We have concluded that the detonation cannot turn the corner and subsequently fails, but the shock wave continues to propagate in the unreacted explosive, leaving behind a dead zone. The detonation front farther out from the corner slowly turns and eventually reaches the air well edge 180{sup o} from its original direction. The dead zone is stable and persists 7.7 {micro}s after the corner-turn, although it has drifted into the original air well area. Our regular reactive flow computer models sometimes show temporary failure but they recover quickly and are unable to model the dead zones. We present a failure model that cuts off the reaction rate below certain detonation velocities and reproduces the qualitative features of the corner-turning failure.

Souers, P C; Andreski, H; Cook III, C F; Garza, R; Pastrone, R; Phillips, D; Roeske, F; Vitello, P; Molitoris, J

2004-03-11T23:59:59.000Z

307

Diesel engine crankshaft journal bearings failures: Case study  

Science Journals Connector (OSTI)

Abstract Wear as a tribological process has major influence on the reliability and life of engine crankshaft bearings. The importance of field examinations of bearing failures due to wear is very well known. They point to the possible causes of wear and to the necessary treatment for its reduction or elimination. The paper presents the results obtained by examining 616 crankshaft bearings, damaged by different mechanisms. The bearings were installed in high-speed diesel engines, and were gathered for two years, during general repairs of the engines (overhaul), i.e. after 3000–5000 working hours. After the examination of the bearings, the fault tree analysis (FTA) was performed to determine the root causes for engine bearing failures. Each type of damage that was identified was illustrated with an appropriate high-resolution photograph. The investigations show that the basic and most conspicuous types of damage which cause bearing failures are abrasive, adhesive and surface fatigue wear. The paper also considers the effects of the place of installation and type of bearing material in respect to each type of wear.

Aleksandar Vencl; Aleksandar Rac

2014-01-01T23:59:59.000Z

308

Materials of Gasification  

SciTech Connect (OSTI)

The objective of this project was to accumulate and establish a database of construction materials, coatings, refractory liners, and transitional materials that are appropriate for the hardware and scale-up facilities for atmospheric biomass and coal gasification processes. Cost, fabricability, survivability, contamination, modes of corrosion, failure modes, operational temperatures, strength, and compatibility are all areas of materials science for which relevant data would be appropriate. The goal will be an established expertise of materials for the fossil energy area within WRI. This would be an effort to narrow down the overwhelming array of materials information sources to the relevant set which provides current and accurate data for materials selection for fossil fuels processing plant. A significant amount of reference material on materials has been located, examined and compiled. The report that describes these resources is well under way. The reference material is in many forms including texts, periodicals, websites, software and expert systems. The most important part of the labor is to refine the vast array of available resources to information appropriate in content, size and reliability for the tasks conducted by WRI and its clients within the energy field. A significant has been made to collate and capture the best and most up to date references. The resources of the University of Wyoming have been used extensively as a local and assessable location of information. As such, the distribution of materials within the UW library has been added as a portion of the growing document. Literature from recent journals has been combed for all pertinent references to high temperature energy based applications. Several software packages have been examined for relevance and usefulness towards applications in coal gasification and coal fired plant. Collation of the many located resources has been ongoing. Some web-based resources have been examined.

None

2005-09-15T23:59:59.000Z

309

Telemonitoring in Patients with Heart Failure  

Science Journals Connector (OSTI)

...coordinators identified patients hospitalized for heart failure in the previous 30 days. Exclusion criteria were residence in a long-term nursing home; inability to participate in the study protocol for any reason, including a low expected probability of survival for the next 6 months owing to conditions... Studies suggest that telemonitoring for outpatients with heart failure may improve outcomes. However, this trial indicates that neither death nor hospital readmission was affected by telemonitoring. The findings do not support its use in outpatients with heart failure.

Chaudhry S.I.; Mattera J.A.; Curtis J.P.

2010-12-09T23:59:59.000Z

310

Investigating the Ability of a Land Surface Model to Simulate Streamflow with the Accuracy of Hydrological Models: A Case Study Using MOPEX Materials  

Science Journals Connector (OSTI)

In the Model Parameter Estimation Experiment (MOPEX) project, after calibration of model parameters, complex rainfall–runoff hydrological models (HMs) simulated streamflow better than land surface models (LSMs), including the Soil–Water–...

Olga N. Nasonova; Yeugeniy M. Gusev; Yeugeniy E. Kovalev

2009-10-01T23:59:59.000Z

311

Materials Science  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Materials Science Materials Science Materials Science1354608000000Materials ScienceSome of these resources are LANL-only and will require Remote Access./No/Questions? 667-5809library@lanl.gov Materials Science Some of these resources are LANL-only and will require Remote Access. Key Resources Data Sources Reference Organizations Journals Key Resources CINDAS Materials Property Databases video icon Thermophysical Properties of Matter Database (TPMD) Aerospace Structural Metals Database (ASMD) Damage Tolerant Design Handbook (DTDH) Microelectronics Packaging Materials Database (MPMD) Structural Alloys Handbook (SAH) Proquest Technology Collection Includes the Materials Science collection MRS Online Proceedings Library Papers presented at meetings of the Materials Research Society Data Sources

312

Local Failure in Resected N1 Lung Cancer: Implications for Adjuvant Therapy  

SciTech Connect (OSTI)

Purpose: To evaluate actuarial rates of local failure in patients with pathologic N1 non-small-cell lung cancer and to identify clinical and pathologic factors associated with an increased risk of local failure after resection. Methods and Materials: All patients who underwent surgery for non-small-cell lung cancer with pathologically confirmed N1 disease at Duke University Medical Center from 1995-2008 were identified. Patients receiving any preoperative therapy or postoperative radiotherapy or with positive surgical margins were excluded. Local failure was defined as disease recurrence within the ipsilateral hilum, mediastinum, or bronchial stump/staple line. Actuarial rates of local failure were calculated with the Kaplan-Meier method. A Cox multivariate analysis was used to identify factors independently associated with a higher risk of local recurrence. Results: Among 1,559 patients who underwent surgery during the time interval, 198 met the inclusion criteria. Of these patients, 50 (25%) received adjuvant chemotherapy. Actuarial (5-year) rates of local failure, distant failure, and overall survival were 40%, 55%, and 33%, respectively. On multivariate analysis, factors associated with an increased risk of local failure included a video-assisted thoracoscopic surgery approach (hazard ratio [HR], 2.5; p = 0.01), visceral pleural invasion (HR, 2.1; p = 0.04), and increasing number of positive N1 lymph nodes (HR, 1.3 per involved lymph node; p = 0.02). Chemotherapy was associated with a trend toward decreased risk of local failure that was not statistically significant (HR, 0.61; p = 0.2). Conclusions: Actuarial rates of local failure in pN1 disease are high. Further investigation of conformal postoperative radiotherapy may be warranted.

Higgins, Kristin A., E-mail: kristin.higgins@duke.edu [Department of Radiation Oncology, Duke University Medical Center, Durham, NC (United States); Chino, Junzo P. [Department of Radiation Oncology, Duke University Medical Center, Durham, NC (United States); Berry, Mark [Department of Surgery, Division of Cardiovascular and Thoracic Surgery, Duke University Medical Center, Durham, NC (United States); Ready, Neal [Department of Medicine, Division of Medical Oncology, Duke University Medical Center, Durham, NC (United States); Boyd, Jessamy [US Oncology, Dallas, TX (United States); Yoo, David S.; Kelsey, Chris R. [Department of Radiation Oncology, Duke University Medical Center, Durham, NC (United States)

2012-06-01T23:59:59.000Z

313

Electronic Colon Cleansing by Colonic Material Tagging and Image Segmentation for Polyp Detection: Detection Model and Method Evaluation1  

E-Print Network [OSTI]

suspension (2.1% w/v, E-Z-EM, Inc.) was mixed in each meal. Most colonic materials were moved out, Electrical Engineering and Computer Science, State University of New York Stony Brook, NY 11794, USA Abstract

314

A model for materials scientists: Water runs off the surface of a lotus leaf without a trace. Researchers  

E-Print Network [OSTI]

to the annoying smears on window panes, it could also make it possible to produce self-cleaning solar panels the annoying smeary film that gets left behind. Reliably self-cleaning MATERIAL & TECHNOLOGY

315

DOE Collects Civil Penalties for Failure to Certify | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Collects Civil Penalties for Failure to Certify Collects Civil Penalties for Failure to Certify DOE Collects Civil Penalties for Failure to Certify August 27, 2012 - 1:07pm Addthis The Office of Enforcement recently settled enforcement actions against ten companies for failure to submit the required certification that products comply with the federal energy conservation standards. Several companies were subject to higher penalties due to a history of noncompliance with the certification regulations. Danby Products, Inc., failed to certify at least three basic models of residential refrigerators and freezers, as required by DOE regulations. On July 9, 2012, DOE issued an order assessing a $9,900 civil penalty for these violations. ASKO Appliances, Inc., failed to certify at least five basic models of

316

Analysis of major failures in Europe’s power grid  

Science Journals Connector (OSTI)

Power grids are prone to failure. Time series of reliability measures such as total power loss or energy not supplied can give significant account of the underlying dynamical behavior of these systems, specially when the resulting probability distributions present remarkable features such as an algebraic tail, usually considered the footprint of self-organization and the existence of critical points. In this paper, 7 years (from 2002 to 2008) of Europe’s transport of electricity network failure events have been analyzed and the best fit for this empirical data probability distribution is presented. With the actual span of available data and although there exists a moderate support for the power-law model, the relatively small amount of events contained in the function’s tail suggests that causal factors other than self-organization or a critical state might be significantly ruling these systems’ dynamics.

Martí Rosas-Casals; Ricard Solé

2011-01-01T23:59:59.000Z

317

The standard theory of market failure  

Science Journals Connector (OSTI)

The theory of market failure represents a normative framework to identify instances where the level of societal welfare produced by market processes alone can be further improved. It also indicates by which ty...

Dr. Katrin Ostertag

2003-01-01T23:59:59.000Z

318

Sandia National Laboratories: identifying solar product failure...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

solar product failure modes Sandia R&D Funded under New DOE SunShot Program On November 27, 2013, in Energy, News, News & Events, Partnership, Photovoltaic, Renewable Energy,...

319

Universitat Augsburg Failure-Sensitive Specification  

E-Print Network [OSTI]

techniques like fault tree analysis (FTA) [14], failure modes and effects analysis (FMEA), or preliminary as well. In this context we already formalized techniques like FTA [12][4] or FMEA. This paper presents

Reif, Wolfgang

320

NREL Test-to-Failure Protocol (Presentation)  

SciTech Connect (OSTI)

The presentation describes the test-to-failure protocol that was developed and piloted at NREL, stressing PV modules with multiple applications of damp heat (with bias) and thermal cycling until they fail.

Hacke, P.

2012-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

3-D seismic modelling of general material anisotropy in the presence of the free surface by a Chebyshev spectral method  

Science Journals Connector (OSTI)

......modelling in general anisotropic media is presented...the qSV and SH waves. Anisotropic free-surface modelling...wavefronts of Green River shale after 375 ms propagation...in the Green River shale model with 45" inclined...qSH-guided SH wave. Anisotropic free-surface modelling......

Ekkehart Tessmer

1995-05-01T23:59:59.000Z

322

Failure mode and effect analysis using fuzzy analytic hierarchy process  

Science Journals Connector (OSTI)

This paper develops an evaluation model based on failure mode and effect analysis (FMEA) and fuzzy analytic hierarchy process (FAHP), to help the maintenance person for assessing the risk priority of the critical components in the paper industry to provide timely maintenance. Traditional FMEA determines risk priority number (RPN) by multiplying the scores of three factors. However the scores which are computed through traditional FMEA do not considere relative importance of the factors. The FAHP is used to compute the relative weights of the decision factors. A numerical example is used to illustrate the efficiency of the proposed model.

M. Ilangkumaran; P. Shanmugam; G. Sakthivel; K. Visagavel

2014-01-01T23:59:59.000Z

323

U-240: Apple Remote Desktop Encryption Failure Lets Remote Users...  

Broader source: Energy.gov (indexed) [DOE]

0: Apple Remote Desktop Encryption Failure Lets Remote Users Obtain Potentially Sensitive Information U-240: Apple Remote Desktop Encryption Failure Lets Remote Users Obtain...

324

Reference Material  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Reference Materials There are a variety of reference materials the NSSAB utilizes and have been made available on its website. Documents Fact Sheets - links to Department of Energy...

325

Materials Science  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Materials Science science-innovationassetsimagesicon-science.jpg Materials Science National security depends on science and technology. The United States relies on Los Alamos...

326

A thermo-mechanical large deformation constitutive model for polymers based on material network description: Application to a semi-crystalline polyamide 66  

Science Journals Connector (OSTI)

Abstract A visco-hyperelastic constitutive model, based on an original approach initially developed by (Billon, 2012) and applied to amorphous rubbery polymers for a one-dimensional formalism, was extended in this study to three-dimensional constitutive equations based on a thermodynamic framework. The model was applied to a semi-crystalline polyamide polymer, PA66. The experiments included tension and shear testing coupled with synchronized digital image correlation and infrared measurements device for capturing the time, temperature, and stress state dependence, as well as the complex thermomechanical coupling exhibited by the material under large deformation. A notion of equivalent strain rate (based on the time–temperature principle superposition) was also introduced to show its capability to build master curves and therefore decrease the number of testing needed to build a material database. The model is based on the Edward Vilgis theory (1986) and accounts for chains network reorganization under external loading through the introduction of an evolution equation for the internal state variable, ? ¯ , representing the degree of mobility of entanglement points. The model accounting for the equivalent strain rate notion was calibrated using master curves. The thermomechanical model agreed well with the experimental mechanical and temperature measurements under tension and shear conditions. The approach developed in this study may open a different way to model the polymer behavior.

A. Maurel-Pantel; E. Baquet; J. Bikard; J.L. Bouvard; N. Billon

2015-01-01T23:59:59.000Z

327

Third-order model of thermal conductivity for random polydisperse particulate materials using well-resolved statistical descriptions from tomography  

Science Journals Connector (OSTI)

Abstract For heterogeneous materials, obtaining an accurate statistical description has remained an outstanding problem. We accurately evaluate the three-point microstructural parameter that arises in third-order bounds and approximations of effective material properties. We propose new adaptive methods for computing n-point probability functions obtained from three-dimensional microstructures. We show that for highly packed systems our methods result in a 45% accuracy improvement compared to the latest techniques, and third-order approximations agree well with simulation data. Furthermore, third-order estimates of the effective behavior are computed for tomographically characterized systems of highly filled polydisperse ellipsoids and cuboids for the first time.

A. Gillman; K. Matouš

2014-01-01T23:59:59.000Z

328

A Study to Verify the Material Surface Concept of Water Table by Examining Analytical and Numerical Models.  

E-Print Network [OSTI]

”. This term defines the water table as having two simultaneous properties: 1) the pressure along the surface is atmospheric pressure, and 2) the water table is fixed to the material, i.e., a set of water particles. This article makes an attempt to explain...

Dadi, Sireesh Kumar

2011-10-21T23:59:59.000Z

329

A broken material approach to modeling oil sand under dynamic load Tim Grain Joseph, Ph.D., P.Eng.,  

E-Print Network [OSTI]

.Eng., Asst. Professor, Mining, University of Alberta and Principal Engineer, JPi Ltd. and Ardeshir Demoobed example of strain softening material in the context of an underfoot environment for large mobile mining behaviour and its response to loading by the equipment. This was discussed by Joseph (2002

Joseph, Tim Grain

330

A novel approach to integrating design into manufacturing and materials education through the fabrication of a scale model cannon  

E-Print Network [OSTI]

and destroyed for metallographic examination. A quasi-experimental two by two factorial design was used to evaluate the effects of the innovative laboratory treatment compared with the effects of standard laboratory treatment. Assessment was performed using... 9 Example Cannon with Original Cheek Configuration .............................. 13 10 Arrangement of the Metrology and Tolerance Assignment ....................... 17 11 Details of the Materials Testing Laboratory...

Weinstein, Jeremy L.

2004-09-30T23:59:59.000Z

331

The Journal of The Minerals, Metals & Materials Society (TMS)  

E-Print Network [OSTI]

1 23 JOM The Journal of The Minerals, Metals & Materials Society (TMS) ISSN 1047-4838 JOM DOI 10 of Materials Science and Engineering and the Materials Research Institute, The Pennsylvania State University cycles require greater resistance of the cladding to failure, espe- cially in view of the industry

Motta, Arthur T.

332

MESOMECHANICAL MODELING OF FRACTURE  

Science Journals Connector (OSTI)

This paper reviews the efforts of the author and his colleagues over the past five decades to develop mesomechanical models of material failure. In the early 1970s a procedure known as the NAG/FRAG (Nucleation and Growth to Fragmentation) methodology was introduced by a group at SRI International. Experiments are performed in which the evolution of micro structural damage is measured posttest as a function of stress time?at?stress temperature and other environmental parameters. Damage nucleation and growth functions are deduced via iterative computational simulations. I conclude the review with a discussion of a current challenging problem: that of designing improved glass and ceramic armors.

D. R. Curran

2009-01-01T23:59:59.000Z

333

CONGESTIVE HEART FAILURE Congestive Heart Failure: Condition in which the heart muscle can not pump enough  

E-Print Network [OSTI]

CONGESTIVE HEART FAILURE Congestive Heart Failure: Condition in which the heart muscle can not pump enough blood to the body to meet the organs demands. Heart muscle dilatation, muscle fibers hypertrophy, and increased heart rate are the clinical markers of disease progression as the heart attempts to compensate

334

Absolute nuclear material assay  

DOE Patents [OSTI]

A method of absolute nuclear material assay of an unknown source comprising counting neutrons from the unknown source and providing an absolute nuclear material assay utilizing a model to optimally compare to the measured count distributions. In one embodiment, the step of providing an absolute nuclear material assay comprises utilizing a random sampling of analytically computed fission chain distributions to generate a continuous time-evolving sequence of event-counts by spreading the fission chain distribution in time.

Prasad, Manoj K. (Pleasanton, CA); Snyderman, Neal J. (Berkeley, CA); Rowland, Mark S. (Alamo, CA)

2012-05-15T23:59:59.000Z

335

Failure Analysis of Cracked FS-85 Tubing and ASTAR-811C End Caps  

SciTech Connect (OSTI)

Failure analyses were performed on cracked FS-85 tubing and ASTAR-811C and caps which had been fabricated as components of biaxial creep specimens meant to support materials testing for the NR Space program. During the failure analyses of cracked FS-85 tubing, it was determined that the failure potentially could be due to two effects: possible copper contamination from the EDM (electro-discharge machined) recast layer and/or an insufficient solution anneal. to prevent similar failures in the future, a more formal analysis should be done after each processing step to ensure the quality of the material before further processing. During machining of the ASTAR-811FC rod to form end caps for biaxial creep specimens, linear defects were observed along the center portion of the end caps. These defects were only found in material that was processed from the top portion of the ingot. The linear defects were attributed to a probable residual ingot pipe that was not removed from the ingot. During the subsequent processing of the ingot to rod, the processing temperatures were not high enough to allow self healing of the ingot's residual pipe defect. To prevent this from occurring in the future, it is necessary to ensure that complete removal of the as-melted ingot pipe is verified by suitable non-destructive evaluation (NDE).

ME Petrichek

2006-02-09T23:59:59.000Z

336

Insulation failure assessment under random energization overvoltages  

SciTech Connect (OSTI)

This paper offers a new simple approach to the evaluation of the risk of failure of external insulation in view of their known probabilistic nature. This is applied to EHV transmission systems subjected to energization overvoltages. The randomness, both in the applied stresses and insulation`s withstand characteristics are numerically simulated and then integrated to assess the risk of failure. Overvoltage control methods are accounted for, such as the use of pre-insertion breaker resistors, series capacitive compensation, and the installation of shunt reactors.

Mahdy, A.M.; Anis, H.I. [Cairo Univ. (Egypt)] [Cairo Univ. (Egypt); El-Morshedy, A. [Faculty of Science for Girls, Dammam (Saudi Arabia)] [Faculty of Science for Girls, Dammam (Saudi Arabia)

1996-03-01T23:59:59.000Z

337

Materializing energy  

Science Journals Connector (OSTI)

Motivated and informed by perspectives on sustainability and design, this paper draws on a diverse body of scholarly works related to energy and materiality to articulate a perspective on energy-as-materiality and propose a design approach of ... Keywords: design, design theory, energy, materiality, sustainability

James Pierce; Eric Paulos

2010-08-01T23:59:59.000Z

338

Microstructure and Property Evolution in Advanced Cladding and Duct Materials Under Long-Term and Elevated Temperature Irradiation: Modeling and Experimental Investigation  

SciTech Connect (OSTI)

The in-service degradation of reactor core materials is related to underlying changes in the irradiated microstructure. During reactor operation, structural components and cladding experience displacement of atoms by collisions with neutrons at temperatures at which the radiation-induced defects are mobile, leading to microstructure evolution under irradiation that can degrade material properties. At the doses and temperatures relevant to fast reactor operation, the microstructure evolves by dislocation loop formation and growth, microchemistry changes due to radiation-induced segregation, radiation-induced precipitation, destabilization of the existing precipitate structure, and in some cases, void formation and growth. These processes do not occur independently; rather, their evolution is highly interlinked. Radiationinduced segregation of Cr and existing chromium carbide coverage in irradiated alloy T91 track each other closely. The radiation-induced precipitation of Ni-Si precipitates and RIS of Ni and Si in alloys T91 and HCM12A are likely related. Neither the evolution of these processes nor their coupling is understood under the conditions required for materials performance in fast reactors (temperature range 300-600°C and doses beyond 200 dpa). Further, predictive modeling is not yet possible as models for microstructure evolution must be developed along with experiments to characterize these key processes and provide tools for extrapolation. To extend the range of operation of nuclear fuel cladding and structural materials in advanced nuclear energy and transmutation systems to that required for the fast reactor, the irradiation-induced evolution of the microstructure, microchemistry, and the associated mechanical properties at relevant temperatures and doses must be understood. Predictive modeling relies on an understanding of the physical processes and also on the development of microstructure and microchemical models to describe their evolution under irradiation. This project will focus on modeling microstructural and microchemical evolution of irradiated alloys by performing detailed modeling of such microstructure evolution processes coupled with well-designed in situ experiments that can provide validation and benchmarking to the computer codes. The broad scientific and technical objectives of this proposal are to evaluate the microstructure and microchemical evolution in advanced ferritic/martensitic and oxide dispersion strengthened (ODS) alloys for cladding and duct reactor materials under long-term and elevated temperature irradiation, leading to improved ability to model structural materials performance and lifetime. Specifically, we propose four research thrusts, namely Thrust 1: Identify the formation mechanism and evolution for dislocation loops with Burgers vector of a<100> and determine whether the defect microstructure (predominately dislocation loop/dislocation density) saturates at high dose. Thrust 2: Identify whether a threshold irradiation temperature or dose exists for the nucleation of growing voids that mark the beginning of irradiation-induced swelling, and begin to probe the limits of thermal stability of the tempered Martensitic structure under irradiation. Thrust 3: Evaluate the stability of nanometer sized Y- Ti-O based oxide dispersion strengthened (ODS) particles at high fluence/temperature. Thrust 4: Evaluate the extent to which precipitates form and/or dissolve as a function of irradiation temperature and dose, and how these changes are driven by radiation induced segregation and microchemical evolutions and determined by the initial microstructure.

Wirth, Brian; Morgan, Dane; Kaoumi, Djamel; Motta, Arthur

2013-12-01T23:59:59.000Z

339

Fluid-driven deformation of a soft granular material  

E-Print Network [OSTI]

Compressing a porous, fluid-filled material will drive the interstitial fluid out of the pore space, as when squeezing water out of a kitchen sponge. Inversely, injecting fluid into a porous material can deform the solid structure, as when fracturing a shale for natural gas recovery. These poromechanical interactions play an important role in geological and biological systems across a wide range of scales, from the propagation of magma through the Earth's mantle to the transport of fluid through living cells and tissues. The theory of poroelasticity has been largely successful in modeling poromechanical behavior in relatively simple systems, but this continuum theory is fundamentally limited by our understanding of the pore-scale interactions between the fluid and the solid. In growing, melting, granular, and fibrous materials, these interactions can be extremely complex. Here, we present a high-resolution measurement of poromechanical deformation driven by fluid injection. We inject fluid into a dense, confined monolayer of soft particles and use particle tracking to reveal the dynamics of the multi-scale deformation field. While a continuum model based on a modification of conventional poroelastic theory captures certain macroscopic features of the deformation, the particle-scale deformation field exhibits dramatic departures from smooth, continuum behavior. We observe novel grain-scale plasticity and hysteresis, as well as petal-like mesoscale structures that are connected to material failure through spiral shear banding.

Christopher W. MacMinn; Eric R. Dufresne; John S. Wettlaufer

2014-05-28T23:59:59.000Z

340

Human Factors Process Failure Mode and Effects Analysis (HF PFMEA) Application in the Evaluation of Management Risks  

E-Print Network [OSTI]

.3.1. Mechanisms of Prevention ............................................................................................... 11 2.4. Human Factors Process Failure Mode and Effects Analysis (HF PFMEA) ....................... 11 2.5. FMEA Components... ........................................................................................... 15 2.5.5. Risk Priority Number ....................................................................................................... 17 2.6. FMEA Model...

Soguilon, Nenita M.

2009-12-18T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Detecting a Network Failure Jon Kleinberg #  

E-Print Network [OSTI]

this notion applied in settings that range from Internet topology discovery tools to remote software agents: detecting a network failure. Suppose we want to detect events of the following form: an adversary destroys itself. Moreover, random sampling provides an e#ective way to construct such a set. Our analysis

Kleinberg, Jon

342

Reliable Communication in the Presence of Failures  

E-Print Network [OSTI]

, including process failures, recoveries, migration, and dynamic changes to group properties like member rankings. A review of several uses for the protocols in the ISIS system, which supports fault-tolerant resilient objects and bulletin boards, illustrates the significant simplification of higher level algorithms

Newhall, Tia

343

Commutation failures in HVDC transmission systems  

SciTech Connect (OSTI)

This paper provides a formulation for the initiation or onset mechanism of commutation failures in line-commutated thyristor converters, assuming infinite (zero impedance) ac systems. A theoretical development and a parametric analysis is given. Theory validation by simulation and comparison to actual field experience data is also given.

Thio, C.V.; Davies, J.B.; Kent, K.L. [Manitoba Hydro, Winnipeg, Manitoba (Canada)] [Manitoba Hydro, Winnipeg, Manitoba (Canada)

1996-04-01T23:59:59.000Z

344

Advanced Materials for Aircraft Engine Applications  

Science Journals Connector (OSTI)

...strength and long creep lives, as-HIP material...cycle fatigue (LCF) lives. LCF is a failure...landing for an aircraft turbine engine). A classic...ductility and fatigue life. Examination ofLCF-tested...the atomizer, and residual dirt from gas supply lines and...

DANIEL G. BACKMAN; JAMES C. WILLIAMS

1992-02-28T23:59:59.000Z

345

2Laser Materials Processing LISI Process  

E-Print Network [OSTI]

and a common delimitation failure point in laser clad material. The LISI process is somewhere in between surface treatment and laser cladding. In LISI a metal or metal/ceramic mixture is pre effects experienced in cladding and welding operations. Laser Induced Surface Improvement (LISI

Davis, Lloyd M.

346

SC e-journals, Materials Science  

Office of Scientific and Technical Information (OSTI)

Materials Science Materials Science Acta Materialia Advanced Composite Materials Advanced Energy Materials Advanced Engineering Materials Advanced Functional Materials Advanced Materials Advanced Powder Technology Advances in Materials Science and Engineering - OAJ Annual Review of Materials Research Applied Composite Materials Applied Mathematical Modelling Applied Mathematics & Computation Applied Physics A Applied Physics B Applied Surface Science Archives of Computational Materials Science and Surface Engineering - OAJ Archives of Materials Science and Engineering - OAJ Carbohydrate Polymers Carbon Catalysis Science & Technology Cellulose Cement and Concrete Research Ceramic Engineering and Science Proceedings Ceramics International Chalcogenide Letters - OAJ Chemical and Petroleum Engineering

347

Finite element modeling of the temperature rise due to the propagation of ultrasonic waves in viscoelastic materials and experimental validation  

Science Journals Connector (OSTI)

The ultrasound stimulated thermography method is usually used to detect the temperature rise at a defect position. The temperature rise can be due to the friction between the edges of the defect and/or the plastic deformation around the defect. This paper presents another aspect of the method when the ultrasounds are propagating in a viscoelasticanisotropicmaterial such as polymers or fiber-reinforced polymers. The attenuation of the waves produces a distributed temperature field. Therefore even a defect that does not produce some heat can be detected the ultrasonic field is modified. A finite element model is used for computing the temperature field and for predicting the possibility for an infrared camera of detecting the temperature rise and its modification due to a defect. The model computes the stress and displacement fields associated with the propagation and the loss of energy. Then the heat equation is solved with this loss as a source of heating. An experiment is done with a sonotrode that excites a PVC plate. The ultrasonic displacement at the top of the plate is measured with a laser velocimeter and introduced in the model. Finally the model result is compared to the image produced by the camera.

B. Hosten; C. Bacon; C. Biateau

2008-01-01T23:59:59.000Z

348

Idealized WRF model sensitivity simulations of sea breeze types and their effects on offshore windfields: Supplementary material  

E-Print Network [OSTI]

and local winds had once again become orientated to favour development of backdoor sea breezes on the southIdealized WRF model sensitivity simulations of sea breeze types and their effects on offshore. Daytime temperatures were sufficiently high to trigger convection over land and the geostrophic wind

Meskhidze, Nicholas

349

Buckling propagation failure in semi-submersible platform columns  

Science Journals Connector (OSTI)

abstract The present paper aims at studying the behavior of stiffened panels from a column segment of a new generation of semi-submersible platforms up to the peak compressive load and in the post-buckling condition. Previous studies have demonstrated a strong influence of the mode and magnitude of initial geometric imperfections, as well as boundary conditions, on the structure's axial load capacity. Numerical–experimental correlation study for small-scale models was performed to define the proper numerical model to be used in more complex numerical simulations of the failure behavior of full-scale column structures. The stiffened panels were assessed to identify the buckling onset in a specific plate and its interaction with longitudinal and transversal stiffeners during the progressive column failure. Measurements of the geometric imperfection distribution of full-scale stiffened panels were collected during construction to better understand the buckling mechanism. Initial geometric imperfections were measured by means of laser-based equipment including a portable measuring system that uses laser technology with sub-millimeter accuracy.

Tiago P. Estefen; Segen F. Estefen

2012-01-01T23:59:59.000Z

350

Total failure mode and effect analysis: a powerful technique for overcoming failures  

Science Journals Connector (OSTI)

In the recent past, researchers and practitioners have been attempting failure prevention as one of the major enablers of attaining continuous quality improvement. For this, failure mode and effect analysis (FMEA) technique is adopted to reduce the probability of system failure and achieve good product quality. However, there has been no significant effort made by the researchers to overcome the pitfalls of FMEA. This practical gap is overcome by applying a technique called total failure mode and effect analysis (TFMEA). This research gap has been indicated and explored further by conducting literature review to draw synergy out of TFMEA along with the unconquered areas of the TFMEA, where TFMEA can be applied. A roadmap for implementing TFMEA has also been contributed in this paper.

C. Krishnaraj; K.M. Mohanasundram; S.R. Devadasan; N.M. Sivaram

2012-01-01T23:59:59.000Z

351

Scintillator material  

DOE Patents [OSTI]

An improved scintillator material comprising cerium fluoride is disclosed. Cerium fluoride has been found to provide a balance of good stopping power, high light yield and short decay constant that is superior to known scintillator materials such as thallium-doped sodium iodide, barium fluoride and bismuth germanate. As a result, cerium fluoride is favorably suited for use as a scintillator material in positron emission tomography.

Anderson, David F. (Batavia, IL); Kross, Brian J. (Aurora, IL)

1992-01-01T23:59:59.000Z

352

Scintillator material  

DOE Patents [OSTI]

An improved scintillator material comprising cerium fluoride is disclosed. Cerium fluoride has been found to provide a balance of good stopping power, high light yield and short decay constant that is superior to known scintillator materials such as thallium-doped sodium iodide, barium fluoride and bismuth germanate. As a result, cerium fluoride is favorably suited for use as a scintillator material in positron emission tomography. 4 figs.

Anderson, D.F.; Kross, B.J.

1994-06-07T23:59:59.000Z

353

Scintillator material  

DOE Patents [OSTI]

An improved scintillator material comprising cerium fluoride is disclosed. Cerium fluoride has been found to provide a balance of good stopping power, high light yield and short decay constant that is superior to known scintillator materials such as thallium-doped sodium iodide, barium fluoride and bismuth germanate. As a result, cerium fluoride is favorably suited for use as a scintillator material in positron emission tomography. 4 figs.

Anderson, D.F.; Kross, B.J.

1992-07-28T23:59:59.000Z

354

Scintillator material  

DOE Patents [OSTI]

An improved scintillator material comprising cerium fluoride is disclosed. Cerium fluoride has been found to provide a balance of good stopping power, high light yield and short decay constant that is superior to known scintillator materials such as thallium-doped sodium iodide, barium fluoride and bismuth germanate. As a result, cerium fluoride is favorably suited for use as a scintillator material in positron emission tomography.

Anderson, David F. (Batavia, IL); Kross, Brian J. (Aurora, IL)

1994-01-01T23:59:59.000Z

355

Advanced Materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Advanced Materials Advanced Materials Advanced Materials Express Licensing Active Terahertz Metamaterial Devices Express Licensing Anion-Conducting Polymer, Composition, And Membrane Express Licensing Analysis Of Macromolecule, Liggands And Macromolecule-Lingand Complexes Express Licensing Carbon Microtubes Express Licensing Chemical Synthesis Of Chiral Conducting Polymers Express Licensing Forming Adherent Coatings Using Plasma Processing Express Licensing Hydrogen Scavengers Express Licensing Laser Welding Of Fused Quartz Express Licensing Multiple Feed Powder Splitter Negotiable Licensing Boron-10 Neutron Detectors for Helium-3 Replacement Negotiable Licensing Insensitive Extrudable Explosive Negotiable Licensing Durable Fuel Cell Membrane Electrode Assembly (MEA) Express Licensing Method of Synthesis of Proton Conducting Materials

356

Critical Materials:  

Office of Environmental Management (EM)

lighting. 14 (bottom) Criticality ratings of shortlisted raw 76 materials. 15 77 2. Technology Assessment and Potential 78 This section reviews the major trends within...

357

SMERDON ET AL.: AUXILIARY MATERIAL Auxiliary Material  

E-Print Network [OSTI]

run [Ammann et al., 2007; hereinafter CCSM] and the GKSS ECHO-g ERIK2 run [González-Rouco et al., 2006; hereinafter ECHO-g]. The annual means of the modeled temperature fields are interpolated to 5° latitude;SMERDON ET AL.: AUXILIARY MATERIAL 2 ECHO-g simulations, respectively. The above conventions

Smerdon, Jason E.

358

A literature view on the application of failure mode and effects analysis in tea industry  

Science Journals Connector (OSTI)

This paper reports a literature survey which has been carried out to study the application of failure mode and effects analysis (FMEA) technique in tea industry. The first phase of this literature survey indicated that so far no researches on the application of failure analysis techniques likes FMEA in tea industry have been conducted. Meanwhile, it was observed that a few advanced models of FMEA have appeared in literature. The salient features of these advanced models of FMEA which were drawn from literature arena have been presented in this paper. The paper has been concluded by suggesting that due to its simplicity and holistic approach, total failure mode and effects analysis (TFMEA) would be a right advanced technique of FMEA for application in tea industry.

I. Alfred Ebenezer; S.R. Devadasan; C.G. Sreenivasa; Päivi Iskanius

2011-01-01T23:59:59.000Z

359

Survey of four damage models for concrete.  

SciTech Connect (OSTI)

Four conventional damage plasticity models for concrete, the Karagozian and Case model (K&C), the Riedel-Hiermaier-Thoma model (RHT), the Brannon-Fossum model (BF1), and the Continuous Surface Cap Model (CSCM) are compared. The K&C and RHT models have been used in commercial finite element programs many years, whereas the BF1 and CSCM models are relatively new. All four models are essentially isotropic plasticity models for which 'plasticity' is regarded as any form of inelasticity. All of the models support nonlinear elasticity, but with different formulations. All four models employ three shear strength surfaces. The 'yield surface' bounds an evolving set of elastically obtainable stress states. The 'limit surface' bounds stress states that can be reached by any means (elastic or plastic). To model softening, it is recognized that some stress states might be reached once, but, because of irreversible damage, might not be achievable again. In other words, softening is the process of collapse of the limit surface, ultimately down to a final 'residual surface' for fully failed material. The four models being compared differ in their softening evolution equations, as well as in their equations used to degrade the elastic stiffness. For all four models, the strength surfaces are cast in stress space. For all four models, it is recognized that scale effects are important for softening, but the models differ significantly in their approaches. The K&C documentation, for example, mentions that a particular material parameter affecting the damage evolution rate must be set by the user according to the mesh size to preserve energy to failure. Similarly, the BF1 model presumes that all material parameters are set to values appropriate to the scale of the element, and automated assignment of scale-appropriate values is available only through an enhanced implementation of BF1 (called BFS) that regards scale effects to be coupled to statistical variability of material properties. The RHT model appears to similarly support optional uncertainty and automated settings for scale-dependent material parameters. The K&C, RHT, and CSCM models support rate dependence by allowing the strength to be a function of strain rate, whereas the BF1 model uses Duvaut-Lion viscoplasticity theory to give a smoother prediction of transient effects. During softening, all four models require a certain amount of strain to develop before allowing significant damage accumulation. For the K&C, RHT, and CSCM models, the strain-to-failure is tied to fracture energy release, whereas a similar effect is achieved indirectly in the BF1 model by a time-based criterion that is tied to crack propagation speed.

Leelavanichkul, Seubpong (University of Utah, Salt Lake City, UT); Brannon, Rebecca Moss (University of Utah, Salt Lake City, UT)

2009-08-01T23:59:59.000Z

360

genBRDF: Synthesizing Novel Analytic BRDFs with Genetic Programming Figure 1: Comparison of BRDFs modeling the tungsten carbide material from the MERL BRDF database. Each scene consists of a sphere  

E-Print Network [OSTI]

of BRDFs modeling the tungsten carbide material from the MERL BRDF database. Each scene consists that remains between state-of-the-art analytic BRDFs and measured data in the case of tungsten carbide

Weimer, Westley

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Soft torque rotary system reduces drillstring failures  

SciTech Connect (OSTI)

This paper reports that the use of the soft torque system has significantly reduced torque fluctuations (up to 80%), torsional drillstring vibrations, and bit slip-stick conditions to help reduce drillstring failures and improve penetration rates in deep directional wells. The system was instrumental in eliminating expensive ($5-10 million) drillstring failures on Well SL 531 No. 3, a complex directional well in Mobile Bay. The soft torque rotary system attenuates and interrupts the torsional oscillations of the drillstring and thus prevents the buildup of energy in torsional waves that are reflected back and forth between the bit and the rotary table. The soft torque rotary system can be installed on any rig equipped with an independent electronically driven rotary table or top drive. The system is relatively inexpensive and easy to install.

Javanmardi, K.; Gaspard, D. (Shell Offshore Inc., New Orleans, LA (United States))

1992-10-12T23:59:59.000Z

362

Failure Rates from Certification Testing to UL and IEC Standards...  

Broader source: Energy.gov (indexed) [DOE]

Failure Rates from Certification Testing to UL and IEC Standards for Flat Plate PV Modules Failure Rates from Certification Testing to UL and IEC Standards for Flat Plate PV...

363

Failure Detection with Booting in Partially Synchronous Systems  

E-Print Network [OSTI]

Failure Detection with Booting in Partially Synchronous Systems Josef Widder1 , G´erard Le Lann2 implementation with respect to failure detection time, but also works during the system booting phase. 1

364

Gearbox Typical Failure Modes, Detection, and Mitigation Methods (Presentation)  

SciTech Connect (OSTI)

This presentation was given at the AWEA Operations & Maintenance and Safety Seminar and focused on what the typical gearbox failure modes are, how to detect them using detection techniques, and strategies that help mitigate these failures.

Sheng, S.

2014-01-01T23:59:59.000Z

365

Shock-induced interfacial failure in glass laminates  

Science Journals Connector (OSTI)

...on the kinetics of the failure process only at the inner interface...relate to the kinetics of these interrelated processes, which are not present in a...upon the delay induced by these processes. The failure wave moves faster...

2000-01-01T23:59:59.000Z

366

Reduce Steam Trap Failures at Chambers Works  

E-Print Network [OSTI]

Ultrasonic Inspection At least 2 times per year Steam Trap Surveyor Submit reports to area management, energy team, and reliability engineers for each area every month Steam Trap Team Leader Control Plan ? Process Owner agrees...Reduce Steam Trap Failures at Chambers Works GB/BB Name: Cyndi Kouba Mentor/MBB: Andrew Degraff Team Members Michael Crowley(Site Energy Lead), (Charlie) Flanigan (Aramids-maintenance), Ben Snyder (Aramids-ATO), Michael Scruggs (Central...

Kouba, C.

367

Timing analysis of PWR fuel pin failures  

SciTech Connect (OSTI)

This report discusses research conducted to develop and demonstrate a methodology for calculation of the time interval between receipt of the containment isolation signals and the first fuel pin failure for loss-of-coolant accidents (LOCAs). Demonstration calculations were performed for a Babcock and Wilcox (B W) design (Oconee) and a Westinghouse (W) four-loop design (Seabrook). Sensitivity studies were performed to assess the impacts of fuel pin burnup, axial peaking factor, break size, emergency core cooling system availability, and main coolant pump trip on these times. The analysis was performed using the following codes: FRAPCON-2, for the calculation of steady-state fuel behavior; SCDAP/RELAP5/MOD3 and TRACPF1/MOD1, for the calculation of the transient thermal-hydraulic conditions in the reactor system; and FRAP-T6, for the calculation of transient fuel behavior. In addition to the calculation of fuel pin failure timing, this analysis provides a comparison of the predicted results of SCDAP/RELAP5/MOD3 and TRAC-PF1/MOD1 for large-break LOCA analysis. Using SCDAP/RELAP5/MOD3 thermal-hydraulic data, the shortest time intervals calculated between initiation of containment isolation and fuel pin failure are 10.4 seconds and 19.1 seconds for the B W and W plants, respectively. Using data generated by TRAC-PF1/MOD1, the shortest intervals are 10.3 seconds and 29.1 seconds for the B W and W plants, respectively. These intervals are for a double-ended, offset-shear, cold leg break, using the technical specification maximum peaking factor and applied to fuel with maximum design burnup. Using peaking factors commensurate with actual burnups would result in longer intervals for both reactor designs. This document provides appendices K and L of this report which provide plots for the timing analysis of PWR fuel pin failures for Oconee and Seabrook respectively.

Jones, K.R.; Wade, N.L.; Katsma, K.R.; Siefken, L.J. (EG and G Idaho, Inc., Idaho Falls, ID (United States)); Straka, M. (Halliburton NUS, Idaho Falls, ID (United States))

1992-09-01T23:59:59.000Z

368

Title: Some notes on software failure Date: 24/Oct/2001  

E-Print Network [OSTI]

mathematical technique used for oil & gas exploration is fundamentally damaged by software failure, (Hatton with a state of the art process, the product will exhibit around 1000 defects in its life-cycle of which 50 failure manifests itself in at least three important ways:- ·Process failure. Here the process

Hatton, Les

369

Role of seepage forces on hydraulic fracturing and failure patterns  

E-Print Network [OSTI]

Role of seepage forces on hydraulic fracturing and failure patterns Alexander Rozhko Thesis September 2007 #12;ii Role of seepage forces on hydraulic fracturing and failure patterns Abstract. The mechanical role of seepage forces on hydraulic fracturing and failure patterns was studied both

Paris-Sud XI, Université de

370

Failure Modes and Effects Analysis 300 Array -LRRR  

E-Print Network [OSTI]

of the Failure Modes and Effects Analysis (FMEA) is to discover critical failure areas in a system and to remove failure areas. 1. 2 This memo contains the results of the final FMEA for the 300 Array LRRR experiment was successfully deployed on the moon as a part of the Apollo 11 mission, this FMEA will not dwell in the aspects

Rathbun, Julie A.

371

NO. ~EV. NO. Failure Modes and Effects Analysis -LRRR  

E-Print Network [OSTI]

of the Failure Modes and Effects Analysis (FMEA) is to discover critical failure areas in the LRRR experiment for the critical failure areas. A TM 868 contains the results of a final FMEA for the LRRR experiment. 2. 0 SUMMARY Since an LRRR was successfully deployed on the moon as a part of the Apollo 11 mission, this FMEA

Rathbun, Julie A.

372

The SNL/MSU/DOE Fatigue of Composite Materials Database: Recent Trends  

E-Print Network [OSTI]

1 The SNL/MSU/DOE Fatigue of Composite Materials Database: Recent Trends Daniel D. Samborsky1 in three areas are described for wind blade materials in the SNL/MSU/DOE fatigue of composite materials failure, epoxy based blade adhesives and core materials. Comparisons of fiber dominated and resin

373

Optimal adaptive control of cascading power grid failures1 Version 2010-Dec-20  

E-Print Network [OSTI]

Optimal adaptive control of cascading power grid failures1 Version 2010-Dec-20 Daniel Bienstock Columbia University New York 1 Introduction Power grids have long been a source of interesting optimization, the central modeling ingredient is that power grids display cascading behavior. A cascade is the process

Bienstock, Daniel

374

An Automated Failure Modes and Effect Analysis Based Visual Matrix Approach to Sensor Selection and  

E-Print Network [OSTI]

- prehensive automated Failure Modes and Effects Analysis (FMEA) using qualitative model based reasoning techniques. The automated FMEA pro- vides a comprehensive set of fault­effect rela- tions by qualitative FMEA results in a fault-effect mapping that can be used to investi- gate the diagnosability

Snooke, Neal

375

Accelerated Simulation of the Probability of Failure of a Main Oil Pipeline Planned Target  

Science Journals Connector (OSTI)

A serial model of a main oil pipeline system is investigated. Lifetime and repair-time distribution functions of the components are assumed to be of a general form. A new accelerated simulation method is proposed enabling one to construct high-accuracy ... Keywords: accelerated simulation, failure probability, main oil pipeline

N. Yu. Kuznetsov

2001-01-01T23:59:59.000Z

376

The Impact of Protection System Failures on Power System Reliability Evaluation  

E-Print Network [OSTI]

of individual components under the circumstances of complex interactions between components due to protection failures. New concepts of the self-down state and the induced-down state are introduced and utilized to build up the composite unit model. Finally, a...

Jiang, Kai

2012-11-05T23:59:59.000Z

377

Two and three dimensional analysis of a slope failure in a lignite mine  

Science Journals Connector (OSTI)

With about 9.3 billion tons of reserve, lignite is a major source for energy production in Turkey. The Afsin-Elbistan lignite basin, containing 47% of the overall lignite reserve in Turkey, lies in the Afsin and Elbistan districts as a part of Kahramanmaras. ... Keywords: Lignite mine, Numerical modeling, Slope failures, Slope stability analysis

Levent Tutluoglu; Ibrahim Ferid ÖGe; Celal Karpuz

2011-02-01T23:59:59.000Z

378

Determination of simple constitutive models for borosilicate glass using penetration-velocity data from ballistic experiments  

SciTech Connect (OSTI)

Constitutive models for brittle materials such as glass can be very complex as they are dependent on strains, strain rates, pressures, temperatures, damage and other parameters. There may also be significant (pressure-dependent) strength after failure such that the constitutive response is much different for intact material and failed material. A large number of laboratory tests is required to develop a comprehensive constitutive model. Another approach is to develop simple models by using penetration-velocity data obtained from ballistic experiments. Here various functional forms of simple models (with a limited number of constants) can be used to (computationally) match the penetration velocity over a range of impact velocities. This allows for the determination of the most important parameters and it provides an approximation of the stresses that occur during penetration. This article presents several simple computational models for borosilicate glass, including single-state models and dual-state models (that include an intact strength and a failed strength)

Johnson, G. R.; Holmquist, T. J. [Southwest Research Institute, 5353 Wayzata Blvd., Minneapolis, MN 55416 (United States)

2007-12-12T23:59:59.000Z

379

Complex Materials  

SciTech Connect (OSTI)

Valentino Cooper uses some of the world's most powerful computing to understand how materials work at subatomic levels, studying breakthroughs such as piezoelectrics, which convert mechanical stress to electrical energy.

Cooper, Valentino

2014-04-17T23:59:59.000Z

380

Complex Materials  

ScienceCinema (OSTI)

Valentino Cooper uses some of the world's most powerful computing to understand how materials work at subatomic levels, studying breakthroughs such as piezoelectrics, which convert mechanical stress to electrical energy.

Cooper, Valentino

2014-05-23T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

NSTX Failure Modes & Effects Analysis / NSTX-FMEA-71-10 / p. 1 of 115 FAILURE MODES AND EFFECTS ANALYSIS  

E-Print Network [OSTI]

NSTX Failure Modes & Effects Analysis / NSTX-FMEA-71-10 / p. 1 of 115 NSTX FAILURE MODES AND EFFECTS ANALYSIS (FMEA) Revision 10 Dated: November 2014 Prepared By: Name/WBS Signature Name: ________________________________________________ Ron Strykowsky, NSTX Upgrade Project Manager #12;NSTX Failure Modes & Effects Analysis / NSTX-FMEA-71

Princeton Plasma Physics Laboratory

382

MO?EE?A2?02: Failure Mode and Effects Analysis (FMEA) on Xoft®  

Science Journals Connector (OSTI)

Purpose: To perform failure mode and effects analysis on Xoft® the alternative Brachytherapy source. The purpose of FMEA analysis is to identify the weak links in the process and develop quality management (QM) measures to reduce the likelihood of such failures. Methods and Materials: FMEA is a strategic activity employed in various industries to recognize and evaluate potential failures of a process/product estimate the effects caused due to any failures/events and take corrective measures to reduce or eliminate the probability of occurrence of such failures. The entire process is quantified using an RPN (Risk Priority Number) score calculated as RPN = S × O × D where S is the severity of the event when it occurs O is the frequency of occurrence of such an event and D is the probability of detection when an event occurs. All the factors are on a scale of 1 (low) to 10 (high). The higher the RPN score the higher the risk due to the event. The RPN scores were estimated initially assuming that there were no QM measures in place and then reassessed after implementation of QA/QC procedures to evaluate the effectiveness of he QA program. Results: Four processes were analyzed and 14 failure modes identified; 4 modes with significant RPN scores above 230. A wrong dose delivery due to a calibration error had the highest RPN score of 400 when there was no QA process which reduced to 192 when QA procedures were established. The event with the next highest RPN score of 300 was source positioning error caused due to transit error which reduced to 120. Conclusion: The QA/QC procedures established for the Xoft® system were found to be effective in educing RPN scores and establishment of a systematic QM program.

G Palaniswaamy; S Richardson; D Rangaraj; S Mutic

2010-01-01T23:59:59.000Z

383

Paradigm Shifts in Heart-Failure Therapy — A Timeline  

Science Journals Connector (OSTI)

...our understanding of heart failure to a level unimaginable today. Heart-Failure Therapy Articles in the New England Journal of Medicine. 1986. V-HeFT I. Cohn JN, Archibald DG, Ziesche S, et al. Effect of vasodilator therapy on mortality in chronic congestive heart failure. 314:1547-52. 1987. CONSENSUS... As we enter a new era of treatment for heart failure with reduced ejection fraction, historical perspective is provided in a timeline (at NEJM.org) of 26 randomized, controlled trials in heart-failure treatment that have been published in the Journal since 1986.

Sacks C.A.Jarcho J.A.Curfman G.D.

2014-09-11T23:59:59.000Z

384

Materializing Energy  

E-Print Network [OSTI]

Motivated and informed by perspectives on sustainability and design, this paper draws on a diverse body of scholarly works related to energy and materiality to articulate a perspective on energy-as-materiality and propose a design approach of materializing energy. Three critical themes are presented: the intangibility of energy, the undifferentiatedness of energy, and the availability of energy. Each theme is developed through combination of critical investigation and design exploration, including the development and deployment of several novel design artifacts: Energy Mementos and The Local Energy Lamp. A framework for interacting with energy-as-materiality is proposed involving collecting, keeping, sharing, and activating energy. A number of additional concepts are also introduced, such as energy attachment, energy engagement, energy attunement, local energy and energy meta-data. Our work contributes both a broader, more integrative design perspective on energy and materiality as well as a diversity of more specific concepts and artifacts that may be of service to designers and researchers of interactive systems concerned with sustainability and energy. Author Keywords Sustainability, energy, materiality, design, design theory

James Pierce; Eric Paulos

385

Nuclear Materials  

E-Print Network [OSTI]

using some analytical expressions. Then, the SPICE model parameters are extracted using Silvaco. The

Gihan T. Sayah; Mohamed Abouelatta; Abdelhalim Zekry

386

Practical Formal Verification of Diagnosability of Large Models  

E-Print Network [OSTI]

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.4.1 Failure Scenario 1: PV03 stuck closed . . . . . . . . . . . 11 5.4.2 Failure Scenario 6: SV of real plants. Section 3 describes how these plants are modeled, and how models can be sim- plified

Bonaventure, Olivier

387

MATERIAL TRACKING USING LANMAS  

SciTech Connect (OSTI)

LANMAS is a transaction-based nuclear material accountability software product developed to replace outdated and legacy accountability systems throughout the DOE. The core underlying purpose of LANMAS is to track nuclear materials inventory and report transactions (movement, mixing, splitting, decay, etc.) to the Nuclear Materials Management and Safeguards System (NMMSS). While LANMAS performs those functions well, there are many additional functions provided by the software product. As a material is received onto a site or created at a site, its entire lifecycle can be tracked in LANMAS complete to its termination of safeguards. There are separate functions to track material movements between and within material balance areas (MBAs). The level of detail for movements within a MBA is configurable by each site and can be as high as a site designation or as detailed as building/room/rack/row/position. Functionality exists to track the processing of materials, either as individual items or by modeling a bulk process as an individual item to track inputs and outputs from the process. In cases where sites have specialized needs, the system is designed to be flexible so that site specific functionality can be integrated into the product. This paper will demonstrate how the software can be used to input material into an account and track it to its termination of safeguards.

Armstrong, F.

2010-06-07T23:59:59.000Z

388

Security Analysis of Selected AMI Failure Scenarios Using Agent Based Game Theoretic Simulation  

SciTech Connect (OSTI)

Information security analysis can be performed using game theory implemented in dynamic Agent Based Game Theoretic (ABGT) simulations. Such simulations can be verified with the results from game theory analysis and further used to explore larger scale, real world scenarios involving multiple attackers, defenders, and information assets. We concentrated our analysis on the Advanced Metering Infrastructure (AMI) functional domain which the National Electric Sector Cyber security Organization Resource (NESCOR) working group has currently documented 29 failure scenarios. The strategy for the game was developed by analyzing five electric sector representative failure scenarios contained in the AMI functional domain. From these five selected scenarios, we characterize them into three specific threat categories affecting confidentiality, integrity and availability (CIA). The analysis using our ABGT simulation demonstrates how to model the AMI functional domain using a set of rationalized game theoretic rules decomposed from the failure scenarios in terms of how those scenarios might impact the AMI network with respect to CIA.

Abercrombie, Robert K [ORNL] [ORNL; Schlicher, Bob G [ORNL] [ORNL; Sheldon, Frederick T [ORNL] [ORNL

2014-01-01T23:59:59.000Z

389

Non-Stationary Random Process for Large-Scale Failure and Recovery of Power Distributions  

E-Print Network [OSTI]

A key objective of the smart grid is to improve reliability of utility services to end users. This requires strengthening resilience of distribution networks that lie at the edge of the grid. However, distribution networks are exposed to external disturbances such as hurricanes and snow storms where electricity service to customers is disrupted repeatedly. External disturbances cause large-scale power failures that are neither well-understood, nor formulated rigorously, nor studied systematically. This work studies resilience of power distribution networks to large-scale disturbances in three aspects. First, a non-stationary random process is derived to characterize an entire life cycle of large-scale failure and recovery. Second, resilience is defined based on the non-stationary random process. Close form analytical expressions are derived under specific large-scale failure scenarios. Third, the non-stationary model and the resilience metric are applied to a real life example of large-scale disruptions due t...

Wei, Yun; Galvan, Floyd; Couvillon, Stephen; Orellana, George; Momoh, James

2012-01-01T23:59:59.000Z

390

Ductile failure analysis of API X65 pipes with notch-type defects using a local fracture criterion  

Science Journals Connector (OSTI)

A local failure criterion for API X65 steel is applied to predict ductile failure of full-scale API X65 pipes with simulated corrosion and gouge defects under internal pressure. The local failure criterion is the stress-modified fracture strain as a function of the stress triaxiality (defined by the ratio of the hydrostatic stress to the effective stress). Based on detailed finite element (FE) analyses with the proposed local failure criterion, burst pressures of defective pipes are estimated and compared with experimental data. For pipes with simulated corrosion defects, FE analysis with the proposed local fracture criterion indicates that predicted failure takes place after the defective pipes attain maximum loads for all cases, possibly due to the fact that the material has sufficient ductility. For pipes with simulated gouge defects, on the other hand, it is found that predicted failure takes place before global instability, and the predicted burst pressures are in good agreement with experimental data, providing confidence in the present approach.

Chang-Kyun Oh; Yun-Jae Kim; Jong-Hyun Baek; Young-Pyo Kim; Woo-Sik Kim

2007-01-01T23:59:59.000Z

391

Clinical investigation: Regional nodal failure patterns in breast cancer patients treated with mastectomy without radiotherapy  

SciTech Connect (OSTI)

Purpose: The purpose of this study was to describe regional nodal failure patterns in patients who had undergone mastectomy with axillary dissection to define subgroups of patients who might benefit from supplemental regional nodal radiation to the axilla or supraclavicular fossa/axillary apex. Methods and Materials: The cohort consisted of 1031 patients treated with mastectomy (including a level I-II axillary dissection) and doxorubicin-based systemic therapy without radiation on five clinical trials at M.D. Anderson Cancer Center. Patient records, including pathology reports, were retrospectively reviewed. All regional recurrences (with or without distant metastasis) were recorded. Median follow-up was 116 months (range, 6-262 months). Results: Twenty-one patients recurred within the low-mid axilla (10-year actuarial rate 3%). Of these, 16 were isolated regional failures (no chest wall failure). The risk of failure in the low-mid axilla was not significantly higher for patients with increasing numbers of involved nodes, increasing percentage of involved nodes, larger nodal size or gross extranodal extension. Only 3 of 100 patients with <10 nodes examined recurred in the low-mid axilla. Seventy-seven patients had a recurrence in the supraclavicular fossa/axillary apex (10-year actuarial rate 8%). Forty-nine were isolated regional recurrences. Significant predictors of failures in this region included {>=}4 involved axillary lymph nodes, >20% involved axillary nodes, and the presence of gross extranodal extension (10-year actuarial rates 15%, 14%, and 19%, respectively, p < 0.0005). The extent of axillary dissection and the size of the largest involved node were not predictive of failure within the supraclavicular fossa/axillary apex. Conclusions: These results suggest that failure in the level I-II axilla is an uncommon occurrence after modified radical mastectomy and chemotherapy. Therefore, supplemental radiotherapy to the dissected axilla is not warranted for most patients. However, patients with {>=}4 involved axillary lymph nodes, >20% involved axillary nodes, or gross extranodal extension are at increased risk of failure in the supraclavicular fossa/axillary apex and should receive radiation to undissected regions in addition to the chest wall.

Strom, Eric A. [Department of Radiation Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX (United States)]. E-mail: estrom@mdanderson.org; Woodward, Wendy A. [Department of Radiation Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX (United States); Katz, Angela [Department of Radiation Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX (United States); Buchholz, Thomas A. [Department of Radiation Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX (United States); Perkins, George H. [Department of Radiation Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX (United States); Jhingran, Anuja [Department of Radiation Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX (United States); Theriault, Richard [Department of Medical Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX (United States); Singletary, Eva [Department of Surgical Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX (United States); Sahin, Aysegul [Department of Pathology, University of Texas M.D. Anderson Cancer Center, Houston, TX (United States); McNeese, Marsha D. [Department of Radiation Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX (United States)

2005-12-01T23:59:59.000Z

392

Biomarkers and diagnostics in heart failure  

Science Journals Connector (OSTI)

Abstract Heart failure (HF) biomarkers have dramatically impacted the way HF patients are evaluated and managed. B-type natriuretic peptide (BNP) and N-terminal proBNP (NT-proBNP) are the gold standard biomarkers in determining the diagnosis and prognosis of HF, and studies on natriuretic peptide-guided HF management look promising. An array of additional biomarkers has emerged, each reflecting different pathophysiological processes in the development and progression of HF: myocardial insult, inflammation and remodeling. Novel biomarkers, such as mid-regional pro atrial natriuretic peptide (MR-proANP), mid-regional pro adrenomedullin (MR-proADM), highly sensitive troponins, soluble ST2 (sST2), growth differentiation factor (GDF)-15 and Galectin-3, show potential in determining prognosis beyond the established natriuretic peptides, but their role in the clinical care of the patient is still partially defined and more studies are needed. This article is part of a Special Issue entitled: Heart failure pathogenesis and emerging diagnostic and therapeutic interventions.

Hanna K. Gaggin; James L. Januzzi Jr.

2013-01-01T23:59:59.000Z

393

Nuclear fuel elements made from nanophase materials  

DOE Patents [OSTI]

A nuclear reactor core fuel element is composed of nanophase high temperature materials. An array of the fuel elements in rod form are joined in an open geometry fuel cell that preferably also uses such nanophase materials for the cell structures. The particular high temperature nanophase fuel element material must have the appropriate mechanical characteristics to avoid strain related failure even at high temperatures, in the order of about 3000 F. Preferably, the reactor type is a pressurized or boiling water reactor and the nanophase material is a high temperature ceramic or ceramic composite. Nanophase metals, or nanophase metals with nanophase ceramics in a composite mixture, also have desirable characteristics, although their temperature capability is not as great as with all-ceramic nanophase material. Combinations of conventional or nanophase metals and conventional or nanophase ceramics can be employed as long as there is at least one nanophase material in the composite. The nuclear reactor so constructed has a number of high strength fuel particles, a nanophase structural material for supporting a fuel rod at high temperature, a configuration to allow passive cooling in the event of a primary cooling system failure, an ability to retain a coolable geometry even at high temperatures, an ability to resist generation of hydrogen gas, and a configuration having good nuclear, corrosion, and mechanical characteristics. 5 figs.

Heubeck, N.B.

1998-09-08T23:59:59.000Z

394

Materials Handbook  

Science Journals Connector (OSTI)

... THE sub title of this handbook gives the clue to the mode of treatment of the subject matter, and so ... seventeen to 'alkalis'; in fact, a better title for the book would be "Handbook of Engineering Materials". British trade names are conspicuously few, but no doubt a ...

E. H. TRIPP

1942-08-15T23:59:59.000Z

395

Investigation into the failure cause of a double-acting, leading-edge-groove, tilting-pad thrust bearing. Final report, Feb-Aug 90  

SciTech Connect (OSTI)

This report describes the results of bench tests simulating operation and failure of a thrust bearing used in a gas turbine engine compressor development test rig. The bearing was a double acting, tilting pad with offset pivot, leading edge groove configuration using an AMS 4928 titanium collar and C18200 copper-chrome alloy pads with a No. 2 babbitt face. The bench tests successfully simulated the bearing failure and demonstrated a materials incompatibility. This was supported by visual examination, scanning electron microscopy and X-ray energy spectroscopy. A comparison of the bench test results to the compressor rig bearing failure is provided to support the report conclusions.

Peterson, B.K.

1990-10-01T23:59:59.000Z

396

ATOMISTIC MODELING OF ELECTRODE MATERIALS  

Broader source: Energy.gov (indexed) [DOE]

electronic state with different absorbents Evaluate Li diffusion on graphite and graphene surface Milestones Peer Review, Washington May 11, 2011 * Use computational ab initio...

397

Atomistc Models of LMRNMC Materials  

Broader source: Energy.gov (indexed) [DOE]

June 19, 2014 25 Technical Back-Up Slides H.I. a nd R.B. AMR June 19, 2014 26 Li 2 MnO 3 Bulk (3-Li & 1-O vac. Far from tet. Mn site): Mn-K edge TT Mn Vo TT (4) 5 6 * Increase...

398

Atomistic Modeling of Electrode Materials  

Broader source: Energy.gov (indexed) [DOE]

Doeff (LBNL) on layered Li-TM-O 2 for effects of Al substitution * Phil Ross (LBNL) on nano-LiFePO 4 for nano-scale effects on performance * Robert Kostecki (LBNL) on the...

399

CONTAINER MATERIALS, FABRICATION AND ROBUSTNESS  

SciTech Connect (OSTI)

The multi-barrier 3013 container used to package plutonium-bearing materials is robust and thereby highly resistant to identified degradation modes that might cause failure. The only viable degradation mechanisms identified by a panel of technical experts were pressurization within and corrosion of the containers. Evaluations of the container materials and the fabrication processes and resulting residual stresses suggest that the multi-layered containers will mitigate the potential for degradation of the outer container and prevent the release of the container contents to the environment. Additionally, the ongoing surveillance programs and laboratory studies should detect any incipient degradation of containers in the 3013 storage inventory before an outer container is compromised.

Dunn, K.; Louthan, M.; Rawls, G.; Sindelar, R.; Zapp, P.; Mcclard, J.

2009-11-10T23:59:59.000Z

400

Failure assessment of composite cooler tubes in a gas boosting station  

Science Journals Connector (OSTI)

The present study describes origin and failure mechanisms of air cooled heat exchangers tubes, in a gas pressure boosting station. Hydrocarbon gas was circulating within aluminum finned tubes and cooling was done by forcing ambient air over the exterior of the tubes, made of carbon steel A-214 material. The hydrocarbon gas was contained traces of H2S and substantial level of CO2. The investigation was carried out in a station located in southern part of Iran. The process involved condensation of water and hydrocarbon along the length of tubes, resulting in a wet gas multiphase flow situation. Such type of coolers is also called composite coolers. The failure of tubes was characterized on the bases of all the available evidences and metallurgical examinations, such as analysis of tube materials, feeding gas, condensate water, and the residue inside the tubes. The processing was also simulated by Hysis-3.1 software, in order to evaluate and compare various parameters such as gas flow rate, liquid water and hydrocarbon formation, in actual and design condition. The air cooled tubes showed highest corrosion rate and was experienced leakage regularly. The results indicated that, low velocity assisted sweet corrosion caused severe pitting inside the tubes, and led to failure.

Khalil Ranjbar

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

DSM to predict distortional failures in cold-formed steel columns exposed to fire: Effect of the constitutive law temperature-dependence  

Science Journals Connector (OSTI)

Abstract This paper presents a numerical (shell finite element) investigation aimed at assessing the performance of the current Direct Strength Method (DSM) provisions against distortional failure to estimate the ultimate strength of fixed-ended cold-formed steel lipped channel and rack-section columns (i) subjected to various uniform temperature distributions caused by fire conditions and (ii) exhibiting different room-temperature yield stresses, covering a wide distortional slenderness range. In particular, the work addresses how does the temperature-dependence of the steel material behaviour, which is felt through both the (reduced) Young’s modulus and nominal yield stress values, influences the quality (accuracy and safety) of the column ultimate strength predictions provided by the DSM distortional strength curve. Six different temperature-dependent steel constitutive laws are considered, namely (i) two models prescribed in part 1.2 of Eurocode 3 (EC3), for cold-formed and hot-rolled steel, and (ii) four experimentally-based analytical expressions recently reported in the literature. The DSM column ultimate strength estimates are compared with the numerical failure loads obtained through geometrically and physically non-linear Ansys shell finite element analyses incorporating critical-mode initial imperfections with small amplitudes.

A. Landesmann; D. Camotim

2015-01-01T23:59:59.000Z

402

Failure Forewarning in NPP Equipment NERI2000-109 Final Project Report  

SciTech Connect (OSTI)

The objective of this project is forewarning of machine failures in critical equipment at next-generation nuclear power plants (NPP). Test data were provided by two collaborating institutions: Duke Engineering and Services (first project year), and the Pennsylvania State University (Applied Research Laboratory) during the second and third project years. New nonlinear methods were developed and applied successfully to extract forewarning trends from process-indicative, time-serial data for timely, condition-based maintenance. Anticipation of failures in critical equipment at next-generation NPP will improve the scheduling of maintenance activities to minimize safety concerns, unscheduled non-productive downtime, and collateral damage due to unexpected failures. This approach provides significant economic benefit, and is expected to improve public acceptance of nuclear power. The approach is a multi-tiered, model-independent, and data-driven analysis that uses ORNL's novel nonlinear method to extract forewarning of machine failures from appropriate data. The first tier of the analysis provides a robust choice for the process-indicative data. The second tier rejects data of inadequate quality. The third tier removes signal artifacts that would otherwise confound the analysis, while retaining the relevant nonlinear dynamics. The fourth tier converts the artifact-filtered time-serial data into a geometric representation, that is then transformed to a discrete distribution function (DF). This method allows for noisy, finite-length datasets. The fifth tier obtains dissimilarity measures (DM) between the nominal-state DF and subsequent test-state DFs. Forewarning of a machine failure is indicated by several successive occurrences of the DM above a threshold, or by a statistically significant trend in the DM. This paradigm yields robust nonlinear signatures of degradation and its progression, allowing earlier and more accurate detection of the machine failure.

Hively, LM

2004-03-26T23:59:59.000Z

403

Functional Materials for Energy | Advanced Materials | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Thermoelectrics Separations Materials Catalysis Sensor Materials Polymers and Composites Carbon Fiber Related Research Chemistry and Physics at Interfaces Materials Synthesis from...

404

Component failure data handbook. Technical evaluation report  

SciTech Connect (OSTI)

This report presents generic component failure rates that are used in reliability and risk studies of commercial nuclear power plants. The rates are computed using plant-specific data from published probabilistic risk assessments supplemented by selected other sources. Each data source is described. For rates with four or more separate estimates among the sources, plots show the data that are combined. The method for combining data from different sources is presented. The resulting aggregated rates are listed with upper bounds that reflect the variability observed in each rate across the nuclear power plant industry. Thus, the rates are generic. Both per hour and per demand rates are included. They may be used for screening in risk assessments or for forming distributions to be updated with plant-specific data.

Gentillon, C.D.

1991-04-01T23:59:59.000Z

405

SciTech Connect: Modeling Thermally Induced Failure of Brittle...  

Office of Scientific and Technical Information (OSTI)

Content: Close Send 0 pages in this document matching the terms "" Search For Terms: Enter terms in the toolbar above to search the full text of this document for pages...

406

An Integrated Approach to Modeling and Mitigating SOFC Failure  

SciTech Connect (OSTI)

The specific objectives of this project were: (1) To develop and demonstrate the feasibility of an integrated predictive computer-based tool for fuel cell design and reliability/durability analysis, (2) To generate new scientific and engineering knowledge to better enable SECA Industry Teams to develop reliable, low-cost solid-oxide fuel cell power generation systems, (3) To create technology breakthroughs to address technical risks and barriers that currently limit achievement of the SECA performance and cost goals for solidoxide fuel cell systems, and (4) To transfer new science and technology developed in the project to the SECA Industry Teams. Through this three-year project, the Georgia Tech's team has demonstrated the feasibility of the solution proposed and the merits of the scientific path of inquiry, and has developed the technology to a sufficient level such that it can be utilized by the SECA Industry Teams. This report summarizes the project's results and achievements.

Jianmin Qu; Andrei Fedorov; Comas Haynes

2006-05-15T23:59:59.000Z

407

A Numeric Predictive Failure Model for Percussive Excavation  

E-Print Network [OSTI]

Densities, 500, 1250, and 1750 BPM, 70 mm Depth, 5 mm/s, ODensities, 0,500, and 1750 BPM, 70 mm Depth, 5 mm/s, 90 Ofrom 4.16 Hz to 29.16 Hz (250 BPM – 1750 BPM). In order to

Green, Alex Nicholas

2011-01-01T23:59:59.000Z

408

Reliability modeling of transmission and distribution systems including dependent failures  

E-Print Network [OSTI]

is considered. Therefore, the trans i t ion rate mat r i x of the entire system need not be generated. Th i s method is compared wi th the sequential method for normal and stormy weather condit ions, and is then extended to include m weather conditions... . 9 E . Cut -Set Equations 10 III M A R K O V C U T - S E T M E T H O D 13 A . Basic Approach 13 B . Markov Cut -Set Me thod 13 C . Examp le 18 D . Compar ison wi th the Sequential Me thod 22 E . Cut-Sets w i th m Weather States 24 F . Extens...

Beydoun, Rami Sami

2012-06-07T23:59:59.000Z

409

Cascading Failures in Power Grid under Three Node Attack Strategies  

Science Journals Connector (OSTI)

This paper studies cascading failures of power grid under three node attack strategies based on...k is k ? , and ?...is a tunable parameter. We investigated the...

Sui-Min Jia; Yun-Ye Wang; Cong Feng; Zhi-Juan Jia…

2014-01-01T23:59:59.000Z

410

Wind Turbine Gearbox Failure Modes - A Brief (Presentation)  

SciTech Connect (OSTI)

Wind turbine gearboxes are not always meeting 20-year design life. Premature failure of gearboxes increases cost of energy, turbine downtime, unplanned maintenance, gearbox replacement and rebuild, and increased warranty reserves. The problem is widespread, affects most Original Equipment Manufacturers, and is not caused by manufacturing practices. There is a need to improve gearbox reliability and reduce turbine downtime. The topics of this presentation are: GRC (Gearbox Reliability Collaborative) technical approach; Gearbox failure database; Recorded incidents summary; Top failure modes for bearings; Top failure modes for gears; GRC test gearbox; Bearing nomenclature; Test history; Real damage; Gear sets; Bearings; Observations; and Summary. 5 refs.

Sheng, S.; McDade, M.; Errichello, R.

2011-10-01T23:59:59.000Z

411

DOE Collects Civil Penalties for Failure to Certify | Department...  

Energy Savers [EERE]

actions against thirty-nine companies for failure to submit the required certification reports that their covered products or equipment comply with federal energy and water...

412

Failure Rates from Certification Testing to UL and IEC Standards...  

Broader source: Energy.gov (indexed) [DOE]

Failure Rates from Certification Testing to UL and IEC Standards for Flat Plate PV Modules Larry Pratt*, Nicholas Riedel*, Martin Plass, and Michael Yamasaki CFV Solar Test...

413

White-Etching Crack Failure Overview, Tomography Analysis, and...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

White-Etching Crack Failure Overview, Tomography Analysis, and Test Development Presented by Aaron Greco of Argonne National Laboratory at the Wind Turbine Tribology Seminar 2014....

414

Physics of Failure of Electrical Interconnects | Department of...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Technologies Program Annual Merit Review and Peer Evaluation ape036devoto2011p.pdf More Documents & Publications Physics of Failure of Electrical Interconnects Reliability...

415

Failure analysis of spiral finned tube on the economizer  

Science Journals Connector (OSTI)

This article describes the results of an investigation about the failure of spiral finned tube on a newly designed and retrofitted low pressure economizer in a 300 MW pulverized-coal-fired power plant. In order to find out the failure causes and to suggest preventive measures, phase compositions and macrostructure of the tube metal surface were investigated by X-Ray Diffraction and Scanning Electron Microscope equipped with energy dispersive X-Ray spectroscopy micro-analysis. The results show that the failure was principally owing to comprehensive multiphase erosion, an interaction of the fly ash wearing, flue gas washing and sulfurous acid corrosion. Recommendations are given to minimize such failures.

ZhiYuan Liang; QinXin Zhao

2013-01-01T23:59:59.000Z

416

Investigations of Bearing Failures Associated with White Etching...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Investigations of Bearing Failures Associated with White Etching Areas (irWEAs) in Wind Turbine Gearboxes Presented by Bob Errichello of GEARTECH at the Wind Turbine Tribology...

417

Structural Analysis of Human and Bovine Bone for Development of Synthetic Materials  

E-Print Network [OSTI]

bones, as well as mimicking nature by developing a synthetic material to repair bones. Experimentally, bovine bone, tumor-free human bone, and cancerous human bone were studied via the small scale mechanical loading test. Failure analysis was conducted...

Jang, Eunhwa

2012-10-19T23:59:59.000Z

418

Numerical Simulation of Matrix Reinforced Composite Materials Subjected to Compression Loads  

Science Journals Connector (OSTI)

This paper reviews the most common formulations to obtain the compression strength of long fiber composites due to fiber buckling. This failure mode was first studied by Rosen (Fibre Composite Materials, pp. 3...

Xavier Martinez; Sergio Oller

2009-12-01T23:59:59.000Z

419

"Tablet-level Origin of Toughening in Abalone Shells and Translation to Synthetic Nanocomposite Materials"  

E-Print Network [OSTI]

bio-inspired nanocomposites. In particular, the development of a nacre-like material, fabricated by 3D printing and exhibiting similar failure modes, will be presented. Then, I will discuss the nanomechanics

Ghosh, Somnath

420

Dissimilar-weld failure analysis and development. Comparative behavior of similar and dissimilar welds. Final report. [Welds of 2-1/4Cr-1Mo to 2-1/4Cr-1Mo using 2-1/4Cr-1Mo filler material; and austenitic to ferritic steel welds made by fusion welding alloy-800H to 2-1/4Cr-1Mo using nickel base filler metal ERNiCr-3  

SciTech Connect (OSTI)

The 593/sup 0/C (1100/sup 0/F) stress rupture behavior of similar metal welds (SMWs) and dissimilar metal welds (DMWs) was investigated under cyclic load and cyclic temperature conditions to provide insight into the question, ''Why do DMWs fail sooner than SMWs in the fossil fuel boilers.'' The weld joints of interest were an all ferritic steel SMW made by fusion welding 2-1/4Cr-1Mo to 2-1/4Cr-1Mo using 2-1/4Cr-1Mo filler metal and an austenitic to ferritic steel DMW made by fusion welding Alloy-800H to 2-1/4Cr-1Mo using a nickel base filler metal ERNiCr-3. The stress rupture behavior obtained on cross weld specimens was similar for both types of welds with only a 20% reduction in rupture life for the DMW. For rupture times less than 1500 hours, failures occurred in the 2-1/4Cr-1Mo base metal whereas, for rupture times greater than 1500 hours, failures occurred in the 2-1/4Cr-1Mo heat affected zone (HAZ). The HAZ failures exhibited a more brittle appearance than the base metal failures for both types of welds and it appears that the life of both joints was limited by the stress rupture properties of the HAZ. These results support the hypothesis that increased residual stresses due to abrupt changes in hardness (strength) of metals involved are the major contributors to the reduction in life of DMWs as compared to SMWs. 10 refs., 15 figs., 7 tabs.

Busboom, H.; Ring, P.J.

1986-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Wear resistance optimisation of composite coatings by computational microstructural modelling  

Science Journals Connector (OSTI)

Abstract The wear resistance of components can be changed remarkably by surface coatings. New processing methods offer many possibilities to tailor the wear resistance of surfaces to match design criteria. Computational modelling and simulation is a systematic approach to optimise the wear performance. Modelling of physical surface phenomena can be carried out on all spatial scale levels, from sub-atomic one to macrolevel and for the various stages in material development, from material processing to structures, properties and performance. The interactions between the coating matrix, the reinforced particles, degraded material phases and defects like pores, cracks and voids are of crucial importance for the wear performance of composite coatings. This has been modelled by synthetic artificial models to find general design rules and by real image based models to find out the wear behaviour of specific coatings. The effect of particle size, morphology, clusters, mean free path and porosity was simulated for thermal spray WC–CoCr coatings. Four main very typical mechanisms for crack initiation resulting in surface failure have been identified: brittle carbide fracture, ductile binder cracking, interface failure, and cracking from pre-existing porosities and defects. The most important coating properties having a crucial effect on coating wear resistance are defects in the coating structure as they can create detrimental stress peaks and high strain levels, particle clustering is most critical for the durability of the structure, the elasticity of the particle is of great importance as well as matrix hardness and particle morphology.

Kenneth Holmberg; Anssi Laukkanen; Erja Turunen; Tarja Laitinen

2014-01-01T23:59:59.000Z

422

Functional Materials for Energy | Advanced Materials | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Energy Storage Fuel Cells Thermoelectrics Separations Materials Catalysis Sensor Materials Polymers and Composites Carbon Fiber Related Research Chemistry and Physics at Interfaces Materials Synthesis from Atoms to Systems Materials Characterization Materials Theory and Simulation Energy Frontier Research Centers Advanced Materials Home | Science & Discovery | Advanced Materials | Research Areas | Functional Materials for Energy SHARE Functional Materials for Energy The concept of functional materials for energy occupies a very prominent position in ORNL's research and more broadly the scientific research sponsored by DOE's Basic Energy Sciences. These materials facilitate the capture and transformation of energy, the storage of energy or the efficient release and utilization of stored energy. A different kind of

423

The role of â-adrenergic signaling in heart failure. : Why do betablockers have beneficial effects in heart failure?.  

E-Print Network [OSTI]

??Background In heart failure, the heart does not pump out enough blood to satisfy the body tissues with oxygen. Well-established lines of evidence suggest that… (more)

Haga, Møyfrid

2007-01-01T23:59:59.000Z

424

Elephant butte powerplant investigation of permanent magnet generator corrosion and bearing failures. Project notes 8450-97-07. Technical memo  

SciTech Connect (OSTI)

This investigation and report were initiated in response to a request to determine causes for excessive corrosion and premature bearing failures on the Woodward Permanent Magnet Generator (PMG) on the three main generating units at Elephant Butte. All three main generating units were rewound using epoxy-type insulating materials between 1989 and 1991. Plant personnel reported that corrosion and failure rates seemed to accelerate after the new stator windings were installed. This report documents field testing conducted the week of March 10, 1997, to determine if stray electrical currents/voltages were causing the problems. Electrical field test results indicate that accelerated PMG bearing failure and corrosion were not caused by stray voltages or current. Tests were conducted on the main shaft in the turbine pit and on the PMG shaft and housing located atop the exciter shaft.

Price, P.; Atwater, P.

1997-04-01T23:59:59.000Z

425

Materials Under Extremes | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Home | Science & Discovery | Advanced Materials | Research Areas | Materials Under Extremes SHARE Materials Under Extremes Materials that can withstand extreme conditions such...

426

Photovoltaic Materials  

SciTech Connect (OSTI)

The goal of the current project was to help make the US solar industry a world leader in the manufacture of thin film photovoltaics. The overall approach was to leverage ORNL’s unique characterization and processing technologies to gain a better understanding of the fundamental challenges for solar cell processing and apply that knowledge to targeted projects with industry members. ORNL has the capabilities in place and the expertise required to understand how basic material properties including defects, impurities, and grain boundaries affect the solar cell performance. ORNL also has unique processing capabilities to optimize the manufacturing process for fabrication of high efficiency and low cost solar cells. ORNL recently established the Center for Advanced Thin-film Systems (CATS), which contains a suite of optical and electrical characterization equipment specifically focused on solar cell research. Under this project, ORNL made these facilities available to industrial partners who were interested in pursuing collaborative research toward the improvement of their product or manufacturing process. Four specific projects were pursued with industrial partners: Global Solar Energy is a solar industry leader in full scale production manufacturing highly-efficient Copper Indium Gallium diSelenide (CIGS) thin film solar material, cells and products. ORNL worked with GSE to develop a scalable, non-vacuum, solution technique to deposit amorphous or nanocrystalline conducting barrier layers on untextured stainless steel substrates for fabricating high efficiency flexible CIGS PV. Ferro Corporation’s Electronic, Color and Glass Materials (“ECGM”) business unit is currently the world’s largest supplier of metallic contact materials in the crystalline solar cell marketplace. Ferro’s ECGM business unit has been the world's leading supplier of thick film metal pastes to the crystalline silicon PV industry for more than 30 years, and has had operational cells and modules in the field for 25 years. Under this project, Ferro leveraged world leading analytical capabilities at ORNL to characterize the paste-to-silicon interface microstructure and develop high efficiency next generation contact pastes. Ampulse Corporation is developing a revolutionary crystalline-silicon (c-Si) thin-film solar photovoltaic (PV) technology. Utilizing uniquely-textured substrates and buffer materials from the Oak Ridge National Laboratory (ORNL), and breakthroughs in Hot-Wire Chemical Vapor Deposition (HW-CVD) techniques in epitaxial silicon developed at the National Renewable Energy Laboratory (NREL), Ampulse is creating a solar technology that is tunable in silicon thickness, and hence in efficiency and economics, to meet the specific requirements of multiple solar PV applications. This project focused on the development of a high rate deposition process to deposit Si, Ge, and Si1-xGex films as an alternate to hot-wire CVD. Mossey Creek Solar is a start-up company with great expertise in the solar field. The primary interest is to create and preserve jobs in the solar sector by developing high-yield, low-cost, high-efficiency solar cells using MSC-patented and -proprietary technologies. The specific goal of this project was to produce large grain formation in thin, net-shape-thickness mc-Si wafers processed with high-purity silicon powder and ORNL's plasma arc lamp melting without introducing impurities that compromise absorption coefficient and carrier lifetime. As part of this project, ORNL also added specific pieces of equipment to enhance our ability to provide unique insight for the solar industry. These capabilities include a moisture barrier measurement system, a combined physical vapor deposition and sputtering system dedicated to cadmium-containing deposits, adeep level transient spectroscopy system useful for identifying defects, an integrating sphere photoluminescence system, and a high-speed ink jet printing system. These tools were combined with others to study the effect of defects on the performance of crystalline silicon and

Duty, C.; Angelini, J.; Armstrong, B.; Bennett, C.; Evans, B.; Jellison, G. E.; Joshi, P.; List, F.; Paranthaman, P.; Parish, C.; Wereszczak, A.

2012-10-15T23:59:59.000Z

427

Application of failure assessment diagrams to proof test analysis  

SciTech Connect (OSTI)

Failure Assessment Diagrams (FADs) are constructed which are applicable to a proof test analysis. The FADs are based on failure curves derived from published elastic-plastic J solutions for a wide range of structural features (e.g., structural geometries, crack shapes and sizes, and applied loads) and strain hardening rates. It is shown how failure curves can be constructed which are relatively how failure curves can be constructed which are relatively insensitive to detailed structural features. These are utilized in the construction of failure curves for use in determining the maximum construction of failure curves for use in determining the maximum flaw sizes that could just survive a proof test overload, and the critical crack size under service conditions. The application of the derived failure curves to determining the flaw screening capability conferred by proof testing is discussed. The concepts behind the developed failure curves are being incorporated into a ``state-of-the-art`` proof test guidelines handbook being developed for NASA.

Chell, G.G.; McClung, R.C. [Southwest Research Institute, San Antonio, TX (United States); Russell, D.A. [Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Division

1995-11-01T23:59:59.000Z

428

FAILURE MODES AND EFFECTS ANALYSIS Dated: May 27, 2010  

E-Print Network [OSTI]

1 NSTX FAILURE MODES AND EFFECTS ANALYSIS (FMEA) Revision 7 Dated: May 27, 2010 Prepared By: Name.07.13 09:11:02 -04'00' #12;NSTX Failure Modes & Effects Analysis / NSTX-FMEA-71-7 / p. 2 of 120 2 Table

Princeton Plasma Physics Laboratory

429

LESSONS LEARNED FROM A LANDFILL SLOPE FAILURE INVOLVING  

E-Print Network [OSTI]

LESSONS LEARNED FROM A LANDFILL SLOPE FAILURE INVOLVING GEOSYTNTHETICS Virginia L. Wilson.L. Soderman and G.P. Raymond November 12, 1998 #12;LESSONS LEARNED FROM A LANDFILL SLOPE FAILURE INVOLVING slopes at waste containment facilities. The Geneva Landfill is located near Geneva, Ohio which

430

DETECTING FAILURE EVENTS IN BUILDINGS: A NUMERICAL AND EXPERIMENTAL ANALYSIS  

E-Print Network [OSTI]

DETECTING FAILURE EVENTS IN BUILDINGS: A NUMERICAL AND EXPERIMENTAL ANALYSIS V. M. Heckman1 M. D the brittle fracture of welds associated with beam-column connections in instrumented buildings in real time use of a prerecorded catalog of Green's functions for an instrumented building to detect failure

Greer, Julia R.

431

Energy Efficiency and Renewables: Market and Behavioral Failures  

ScienceCinema (OSTI)

Thursday, January 28, 2010: Policies to promote renewable energy and energy efficiency have been gaining momentum throughout the world, often justified by environmental and energy security concerns. This presentation first talks about energy efficiency options, then delves into the economic motivation for energy efficiency and renewable energy policies by articulating the classes of relevant behavioral failures and market failures. Such behavioral and market failures may vary intertemporally or atemporally; the temporal structure and the extent of the failures are the critical considerations in the development of energy policies. The talk discusses key policy instruments and assess the extent to which they are well-suited to correct for failures with different structures. http://eetd.lbl.gov/dls/lecture-01-28...

James Sweeney

2010-09-01T23:59:59.000Z

432

Quantum effects and anharmonicity in the H{sub 2}-Li{sup +}-benzene complex: A model for hydrogen storage materials  

SciTech Connect (OSTI)

Quantum and anharmonic effects are investigated in H{sub 2}-Li{sup +}-benzene, a model for hydrogen adsorption in metal-organic frameworks and carbon-based materials. Three- and 8-dimensional quantum diffusion Monte Carlo (QDMC) and rigid-body diffusion Monte Carlo (RBDMC) simulations are performed on potential energy surfaces interpolated from electronic structure calculations at the M05-2X/6-31+G(d,p) and M05-2X/6-311+G(2df,p) levels of theory using a three-dimensional spline or a modified Shepard interpolation. These calculations investigate the intermolecular interactions in this system, with three- and 8-dimensional 0 K H{sub 2} binding enthalpy estimates, ?H{sub bind} (0 K), being 16.5 kJ mol{sup ?1} and 12.4 kJ mol{sup ?1}, respectively: 0.1 and 0.6 kJ mol{sup ?1} higher than harmonic values. Zero-point energy effects are 35% of the value of ?H{sub bind} (0 K) at M05-2X/6-311+G(2df,p) and cannot be neglected; uncorrected electronic binding energies overestimate ?H{sub bind} (0 K) by at least 6 kJ mol{sup ?1}. Harmonic intermolecular binding enthalpies can be corrected by treating the H{sub 2} “helicopter” and “ferris wheel” rotations as free and hindered rotations, respectively. These simple corrections yield results within 2% of the 8-dimensional anharmonic calculations. Nuclear ground state probability density histograms obtained from the QDMC and RBDMC simulations indicate the H{sub 2} molecule is delocalized above the Li{sup +}-benzene system at 0 K.

Kolmann, Stephen J.; D'Arcy, Jordan H.; Jordan, Meredith J. T., E-mail: m.jordan@chem.usyd.edu.au [School of Chemistry, The University of Sydney, NSW 2006 (Australia)] [School of Chemistry, The University of Sydney, NSW 2006 (Australia)

2013-12-21T23:59:59.000Z

433

Critical Materials Workshop  

Broader source: Energy.gov [DOE]

Presentations during the Critical Materials Workshop held on April 3, 2012 overviewing critical materials strategies

434

Critical Materials Institute  

ScienceCinema (OSTI)

Ames Laboratory Director Alex King talks about the goals of the Critical Materials Institute in diversifying the supply of critical materials, developing substitute materials, developing tools and techniques for recycling critical materials, and forecasting materials needs to avoid future shortages.

Alex King

2013-06-05T23:59:59.000Z

435

Unusual refinery boiler tube failures due to corrosion by sulfuric acid induced by steam leaks  

SciTech Connect (OSTI)

Corrosion by sulfuric acid in boilers is a low probability event because gas temperature and metal temperature of boiler tubes are high enough to avoid the condensation of sulfuric acid from flue gases. This degradation mechanism is frequently considered as an important cause of air preheaters materials degradation, where flue gases are cooled by heat transfer to the combustion air. Corrosion is associated to the presence of sulfuric acid, which condensates if metal temperature (or gas temperature) is below of the acid dew point. In economizer tubes, sulfuric acid corrosion is an unlikely event because flue gas and tube temperatures are normally over the acid dewpoint. In this paper, the failure analysis of generator tubes (similar to the economizer of bigger boilers) of two small oil-fired subcritical boilers is reported. It is concluded that sulfuric acid corrosion was the cause of the failure. The sulfuric acid condensation was due to the contact of flue gases containing SO{sub 3} with water-steam spray coming from leaks at the interface of rolled tube to the drum. Considering the information gathered from these two cases studied, an analysis of this failure mechanism is presented including a description of the thermodynamics condition of water leaking from the drum, and an analysis of the factors favoring it.

Lopez-Lopez, D.; Wong-Moreno, A. [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1998-12-31T23:59:59.000Z

436

Failure of the Shockley-Haynes Mobility Experiment with organic semiconducting materials  

E-Print Network [OSTI]

of the teflon cylinder was 0. 20$ cm + 0. 00$ cm whioh was slight- ly smaller than the graphite rods used, This arrapgement provided an airtight seal to prevent the sublimation of iodine from the samples after pressing Small holes were drilled through...-iodine was lower than that reported, The upper limit of 3000 lb/i. n for the pressure used to 2 oompress the samples was dictated by the graphite rods used and the wall thickness of the teflon oylinders. Pressures above $000 lb/in oaused either the ends...

Boehme, Hollis Clyde

2012-06-07T23:59:59.000Z

437

Material selection for electrooptic deflectors  

SciTech Connect (OSTI)

The selection of a material for a practical device is generally guided by a number of criteria, including cost, size, difficulty of fabrication, durability, driver requirements, and system constraints. A quantitative analysis can usually be made for comparison, or a figure of merit can be computed. In the case of materials for electrooptical (EO) devices the choice is often made based on the availability of materials meeting some minimum system requirement. For fast EO deflectors, where a large number of resolvable spots is required, the choice of materials is quite limited. A model of just such a device is proposed; it is based on the resolution of 400 spots and reasonable boundary conditions. The model predicts that to be successful, an EO material must be chosen that has a linear EO coefficient (r/sub 33/) of at least 336 pm/V. A survey was conducted of the EO materials which are generally available. Based on the model and the survey, Czochralski crystal growth of strontium barium niobate (SBN:60) is recommended. Although SBN:60 does not have the largest EO coefficient, it may be the easiest to grow in the required size and optical quality, thus satisfying the availability criterion. It should be borne in mind that many materials may be grown by this technique and there are many new and potential applications for EO materials. 92 refs., 18 figs., 14 tabs.

Not Available

1988-09-01T23:59:59.000Z

438

A remote monitoring and telephone nurse coaching intervention to reduce readmissions among patients with heart failure: study protocol for the Better Effectiveness After Transition - Heart Failure (BEAT-HF) randomized controlled trial  

E-Print Network [OSTI]

Bonow RO: Rehospitalization for heart failure: problems andInterventional Monitoring in Heart Failure Investigators:patients with chronic heart failure. Circulation 2011, 123:

2014-01-01T23:59:59.000Z

439

Numerical modeling of the effect of heat and mass transfer in porous low-temperature heat insulation in composite material structures on the magnitude of stresses which develop  

Science Journals Connector (OSTI)

The stressed state of multilayer low-temperature heat insulation for a cryogenic fuel tank is considered. ... is taken of heat and mass transfer in foam plastic (the main heat insulation material) occurring at cr...

G. V. Kuznetsov; N. V. Rudzinskaya

440

Educational Material  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

You can order a chart of the Fundamental Particles and Interactions that summarizes the current status of the Standard Model (view chart.) You can order a chart of the Fundamental Particles and Interactions that summarizes the current status of the Standard Model (view chart.) Adventures in Particle Physics is a CD-ROM that contains the complete Particle Adventure as well as the Quark Adventure, a version appropriate for exhibition settings. There are English, Spanish, French, and German versions of both adventures on the CD-ROM. It is both PC and Mac compatible. Student and teacher worksheets for classroom activities. Teachers are encouraged to print out and reproduce these pages for classroom activities (en Español). The Charm of Strange Quarks: Mysteries and Revolutions of Particle Physics can be ordered now. This book brings the excitement and a basic understanding of this fundamental topic to the public and especially to students. It includes very recent developments in particle physics and cosmology. More details

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Gas storage materials, including hydrogen storage materials  

DOE Patents [OSTI]

A material for the storage and release of gases comprises a plurality of hollow elements, each hollow element comprising a porous wall enclosing an interior cavity, the interior cavity including structures of a solid-state storage material. In particular examples, the storage material is a hydrogen storage material, such as a solid state hydride. An improved method for forming such materials includes the solution diffusion of a storage material solution through a porous wall of a hollow element into an interior cavity.

Mohtadi, Rana F; Wicks, George G; Heung, Leung K; Nakamura, Kenji

2014-11-25T23:59:59.000Z

442

Estimation of Failure Frequency for Type I and II High Level Waste Tanks  

SciTech Connect (OSTI)

The failure frequency of Type I and Type II High Level Waste tanks was calculated. The degradation mechanism that could lead to large break failure and the credits taken for steps taken to prevent large break failure were considered.

Subramanian, K.H.

2001-05-15T23:59:59.000Z

443

Congestive heart failure: treat the disease, not the symptom: return to normalcy/Part II--the experimental approach.  

E-Print Network [OSTI]

Number: Title: Congestive heart failure: treat the diseaseinvited) TITLE: Congestive heart failure: treat the diseasetreatment of congestive heart failure due to post-infarction

Buckberg, Gerald D

2007-01-01T23:59:59.000Z

444

Development of Functionally Graded Materials for Manufacturing Tools and Dies and Industrial Processing Equipment  

SciTech Connect (OSTI)

Hot forming processes such as forging, die casting and glass forming require tooling that is subjected to high temperatures during the manufacturing of components. Current tooling is adversely affected by prolonged exposure at high temperatures. Initial studies were conducted to determine the root cause of tool failures in a number of applications. Results show that tool failures vary and depend on the operating environment under which they are used. Major root cause failures include (1) thermal softening, (2) fatigue and (3) tool erosion, all of which are affected by process boundary conditions such as lubrication, cooling, process speed, etc. While thermal management is a key to addressing tooling failures, it was clear that new tooling materials with superior high temperature strength could provide improved manufacturing efficiencies. These efficiencies are based on the use of functionally graded materials (FGM), a new subset of hybrid tools with customizable properties that can be fabricated using advanced powder metallurgy manufacturing technologies. Modeling studies of the various hot forming processes helped identify the effect of key variables such as stress, temperature and cooling rate and aid in the selection of tooling materials for specific applications. To address the problem of high temperature strength, several advanced powder metallurgy nickel and cobalt based alloys were selected for evaluation. These materials were manufactured into tooling using two relatively new consolidation processes. One process involved laser powder deposition (LPD) and the second involved a solid state dynamic powder consolidation (SSDPC) process. These processes made possible functionally graded materials (FGM) that resulted in shaped tooling that was monolithic, bi-metallic or substrate coated. Manufacturing of tooling with these processes was determined to be robust and consistent for a variety of materials. Prototype and production testing of FGM tooling showed the benefits of the nickel and cobalt based powder metallurgy alloys in a number of applications evaluated. Improvements in tool life ranged from three (3) to twenty (20) or more times than currently used tooling. Improvements were most dramatic where tool softening and deformation were the major cause of tool failures in hot/warm forging applications. Significant improvement was also noted in erosion of aluminum die casting tooling. Cost and energy savings can be realized as a result of increased tooling life, increased productivity and a reduction in scrap because of improved dimensional controls. Although LPD and SSDPC tooling usually have higher acquisition costs, net tooling costs per component produced drops dramatically with superior tool performance. Less energy is used to manufacture the tooling because fewer tools are required and less recycling of used tools are needed for the hot forming process. Energy is saved during the component manufacturing cycle because more parts can be produced in shorter periods of time. Energy is also saved by minimizing heating furnace idling time because of less downtime for tooling changes.

Lherbier, Louis, W.; Novotnak, David, J.; Herling, Darrell, R.; Sears, James, W.

2009-03-23T23:59:59.000Z

445

Reliability analysis for wind turbines with incomplete failure data collected from after the date of initial installation  

E-Print Network [OSTI]

Reliability analysis for wind turbines with incomplete failure data collected from after the date model Maximum likelihood Least squares Wind turbines a b s t r a c t Reliability has an impact on wind analysis. In wind energy industry, wind farm operators have greater interest in recording wind turbine

McCalley, James D.

446

Materials Science & Engineering | More Science | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Advanced Materials Clean Energy Materials Theory and Simulation Neutron Science Nuclear Forensics Nuclear Science Supercomputing Theory, Modeling and Simulation Mathematics Physics More Science Home | Science & Discovery | More Science | Materials Science and Engineering SHARE Materials Science and Engineering ORNL's core capability in applied materials science and engineering directly supports missions in clean energy, national security, and industrial competitiveness. A key strength of ORNL's materials science program is the close coupling of basic and applied R&D. Programs building on this core capability are focused on (1) innovations and improvements in materials synthesis, processing, and design; (2) determination and manipulation of critical structure-property relationships, and (3)

447

Terrestrial Photovoltaic Module Accelerated Test-To-Failure Protocol  

SciTech Connect (OSTI)

This technical report documents a test-to-failure protocol that may be used to obtain quantitative information about the reliability of photovoltaic modules using accelerated testing in environmental temperature-humidity chambers.

Osterwald, C. R.

2008-03-01T23:59:59.000Z

448

A two-parameter lifetime distribution with decreasing failure rate  

Science Journals Connector (OSTI)

In this paper, a new two-parameter lifetime distribution with decreasing failure rate is introduced. Various properties of the proposed distribution are discussed. The estimation of the parameters attained by the EM algorithm and their asymptotic variances ...

Rasool Tahmasbi; Sadegh Rezaei

2008-04-01T23:59:59.000Z

449

Failure mode and effects analysis outputs: are they valid?  

Science Journals Connector (OSTI)

Failure Mode and Effects Analysis (FMEA) is a prospective risk assessment tool that ... this study was to explore the validity of FMEA outputs within a hospital setting in the...

Nada Atef Shebl; Bryony Dean Franklin; Nick Barber

2012-06-01T23:59:59.000Z

450

WTFMEA: a technique for failure prevention through global knowledge sharing  

Science Journals Connector (OSTI)

Failure Mode and Effect Analysis (FMEA) is a frequently employed technique to achieve continuous quality improvement through prevention of failures. Since the application of FMEA is largely restricted to design and production functions, an improved technique called Total Failure Mode and Effects Analysis (TFMEA) has been adopted in the research reported in this paper. Of late, organisations have been realising the importance of adopting Information Technology (IT) to enhance productivity in their operations. On realising its potential, IT has been tactically integrated with TFMEA to evolve a technique called Web-Based Total Failure Mode and Effects Analysis (WTFMEA). The functionality of WTFMEA has been explained using its screen outputs. The efforts made to practically validate WTFMEA are narrated. While concluding, the capabilities of WTFMEA in achieving continuous quality and productivity improvement through global knowledge sharing are enumerated. The limitations of WTFMEA and the ways of overcoming them in future are appraised.

C. Sudhahar; R. Suresh Premil Kumar; V. Senthil; S.R. Devadasan; R. Murugesh

2008-01-01T23:59:59.000Z

451

The effects of training the biceps brachii muscle to failure  

E-Print Network [OSTI]

An experimental study was conducted to observe the effects on the size and strength of the biceps brachii muscle of an exercise routine that trained the biceps to failure during each workout. The workout routine used ten ...

Walker, Donald L., III

2007-01-01T23:59:59.000Z

452

Selection of minimum earthquake intensity in calculating pipe failure probabilities  

SciTech Connect (OSTI)

In a piping reliability analysis, it is sometimes necessary to specify a minimum ground motion intensity, usually the peak acceleration, below which the ground motions are not considered as earthquakes and, hence, are neglected. The calculated probability of failure of a piping system is dependent on this selected minimum earthquake intensity chosen for the analysis. A study was conducted to determine the effects of the minimum earthquake intensity on the probability of pipe failure. The results indicated that the probability of failure of the piping system is not very sensitive to the variations of the selected minimum peak ground acceleration. However, it does have significant effects on various scenarios that make up the system failure.

Lo, T.Y.

1985-01-01T23:59:59.000Z

453

Corrosion Failure of an In-service Economizer Tube  

Science Journals Connector (OSTI)

This investigation was primarily aimed to examine the in-service failure of an economizer tube. Apart from preliminary visual examination, ... thickness hole in the weld region of the economizer tube. This water ...

H. Roy; P. Sharma; D. Ghosh; A. K. Shukla

2014-08-01T23:59:59.000Z

454

Performance of wireless sensor networks under random node failures  

SciTech Connect (OSTI)

Networks are essential to the function of a modern society and the consequence of damages to a network can be large. Assessing network performance of a damaged network is an important step in network recovery and network design. Connectivity, distance between nodes, and alternative routes are some of the key indicators to network performance. In this paper, random geometric graph (RGG) is used with two types of node failure, uniform failure and localized failure. Since the network performance are multi-facet and assessment can be time constrained, we introduce four measures, which can be computed in polynomial time, to estimate performance of damaged RGG. Simulation experiments are conducted to investigate the deterioration of networks through a period of time. With the empirical results, the performance measures are analyzed and compared to provide understanding of different failure scenarios in a RGG.

Bradonjic, Milan [Los Alamos National Laboratory; Hagberg, Aric [Los Alamos National Laboratory; Feng, Pan [Los Alamos National Laboratory

2011-01-28T23:59:59.000Z

455

Some Studies on Automatic Generation of Structural Failure Modes  

Science Journals Connector (OSTI)

This paper is concerned with the following two subjects: (1)The depth-first and the width-first branching rules are compared for selecting probabilistically significant failure paths in a redundant structure. ...

Yoshisada Murotsu; Shaowen Shao…

1991-01-01T23:59:59.000Z

456

Multi Material Paradigm  

Energy Savers [EERE]

Multi Material Paradigm Glenn S. Daehn Department of Materials Science and Engineering, The Ohio State University Advanced Composites (FRP) Steel Spaceframe Multi Material Concept...

457

Improvement of SRAM-based failure analysis calibrated IDDQ testing  

E-Print Network [OSTI]

the methodology and detail procedure of simulation based failure analysis t, echnique is explained. Chapter IV discusses the implementation of Iddq current calibration. Chapter V provides some examples supporting the failure analysis methodology . Conclusion... method that is often used to localize surface defects is by examining the hot emission spots. This process functions by detecting the excessive heat generated by the defective neighborhood during device operation. Heat sensitive liquid crystal...

Balachandran, Hariharan

1996-01-01T23:59:59.000Z

458

E-Print Network 3.0 - assessment containment failure Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Henning and Paasch 17 also adopt... A FUNCTION BASED DESIGN TOOL FOR FAILURE MODE IDENTIFICATION AND FAILURE-FREE DESIGN by SRIKESH G... ABSTRACT Knowledge of potential...

459

Integration of Failure Modes and Effects Analysis (FMEA) in the Engineering Design Process.  

E-Print Network [OSTI]

??ABSTRACT Integration of Failure Modes and Effects Analysis (FMEA) in the Engineering Design Process Hua-wei Wen Failure modes and effects analysis (FMEA) is one of… (more)

Wen, Hua-wei

2013-01-01T23:59:59.000Z

460

E-Print Network 3.0 - acute-on-chronic liver failure Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

liver failure, tyrosinemia type I... liver failure. Gene transfer vector - A vehicle for transferring genetic infor- mation into somatic... diseases. Artifidal livers...

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Undercarriage Material Requirements  

Science Journals Connector (OSTI)

...grindingr softening and re-hardening burns by etching in 4 %nitric acid. 660...imperfections such as inclusions or small corrosion pits on the surfaces of typical undercarriage...failure survey described above, corrosion pits, hydrogen embrittlement, etc. which...

1976-01-01T23:59:59.000Z

462

Nuclear Reactor Materials and Fuels  

Science Journals Connector (OSTI)

Nuclear reactor materials and fuels can be classified into six categories: Nuclear fuel materials Nuclear clad materials Nuclear coolant materials Nuclear poison materials Nuclear moderator materials

Dr. James S. Tulenko

2012-01-01T23:59:59.000Z

463

Modeling and Simulating Blast Effects on Electric Substations  

SciTech Connect (OSTI)

A software simulation tool was developed at the Idaho National Laboratory to estimate the fragility of electric substation components subject to an explosive blast. Damage caused by explosively driven fragments on a generic electric substation was estimated by using a ray-tracing technique to track and tabulate fragment impacts and penetrations of substation components. This technique is based on methods used for assessing vulnerability of military aircraft and ground vehicles to explosive blasts. An open-source rendering and ray-trace engine was used for geometric modeling and interactions between fragments and substation components. Semi-empirical material interactions models were used to calculate blast parameters and simulate high-velocity material interactions between explosively driven fragments and substation components. Finally, a Monte Carlo simulation was added to model the random nature of fragment generation allowing a skilled analyst to predict failure probabilities of substation components.

Lyle G. Roybal; Robert F. Jeffers; Kent E. McGillivary; Tony D. Paul; Ryan Jacobson

2009-05-01T23:59:59.000Z

464

Safety assessment of a robotic system handling nuclear material  

SciTech Connect (OSTI)

This paper outlines the use of a Failure Modes and Effects Analysis for the safety assessment of a robotic system being developed at Sandia National Laboratories. The robotic system, The Weigh and Leak Check System, is to replace a manual process at the Department of Energy facility at Pantex by which nuclear material is inspected for weight and leakage. Failure Modes and Effects Analyses were completed for the robotics process to ensure that safety goals for the system had been meet. These analyses showed that the risks to people and the internal and external environment were acceptable.

Atcitty, C.B.; Robinson, D.G.

1996-02-01T23:59:59.000Z

465

Viscoelastic behavior of fiber-reinforced composite materials undergoing cure  

E-Print Network [OSTI]

A viscoelastic material model has been proposed to characterize the curing and thermal effects on the viscoelastic material properties of both the matrix material and the composite lamina. Micromechanics simulations are used to generate...

Wang, Kai

1999-01-01T23:59:59.000Z

466

Method for forming materials  

DOE Patents [OSTI]

A material-forming tool and a method for forming a material are described including a shank portion; a shoulder portion that releasably engages the shank portion; a pin that releasably engages the shoulder portion, wherein the pin defines a passageway; and a source of a material coupled in material flowing relation relative to the pin and wherein the material-forming tool is utilized in methodology that includes providing a first material; providing a second material, and placing the second material into contact with the first material; and locally plastically deforming the first material with the material-forming tool so as mix the first material and second material together to form a resulting material having characteristics different from the respective first and second materials.

Tolle, Charles R. (Idaho Falls, ID); Clark, Denis E. (Idaho Falls, ID); Smartt, Herschel B. (Idaho Falls, ID); Miller, Karen S. (Idaho Falls, ID)

2009-10-06T23:59:59.000Z

467

Plant Networks for Processing Recyclable Materials  

Science Journals Connector (OSTI)

We use a modified optimal market area model to examine how links between material recycling and other aspects of operations strategy can shape plant networks for the processing of recyclable materials. We characterize the complementarity of the recyclate ... Keywords: localization, material versatility, minimills, operations strategy, optimal market area, plant networks, recycling

Lieven Demeester; Mei Qi; Luk N. Van Wassenhove

2013-10-01T23:59:59.000Z

468

Correlation analysis for wind speed and failure rate of wind turbines using time series approach  

Science Journals Connector (OSTI)

The correlation between wind speed and failure rate (FR) of wind turbines is analyzed with time series approach. The time series of power index (PI) and FR of wind turbines are established based on historical data which are pretreated by singularity processing stationarity processing and wavelet de-noising. The trend variations of the time series are analyzed from both time domain and frequency domain by extracting the indicator functions including auto-correlation function cross-correlation function and spectral density function. A case study is given out to verify the validity of the model and the method which is based on the wind speed and failure data from January 1995 to December of 2002 in Nordjylland Denmark. Auto-correlation function and spectral density function show that time series of PI and FR have strong seasonal characteristics and quite similar periodicity while the cross-correlation function shows they keep high consistency and strong correlation. The results indicate that by calculating and monitoring PI the failure rule of wind turbines can be forecast which provides theoretical basis for preventive maintenance of wind turbines.

Chun Su; Quan Jin; Yequn Fu

2012-01-01T23:59:59.000Z

469

A case study on thrust bearing failures at the SÃO SIMÃO hydroelectric power plant  

Science Journals Connector (OSTI)

Abstract After twenty years without any apparent problems on their combined guide and thrust bearings, the six 280 MW hydrogenerators of the São Simão Hydroelectric Power Plant were failing. The source of the failure was the melting of the thrust pad babbitt lining. The machines began showing performance failures, leading to a sudden interruption in their operation. This caused considerable losses with high direct and indirect costs. The solution proposed by the bearing manufacturer was an improvement in the bearing design and the installation of new water–oil heat exchangers. The direct cost of their solution was estimated to be US $2,400,000.00. In a search for a less expensive alternative, CEMIG started a parallel study focused on the heat exchangers. A methodology based on heat transfer was applied, indicating that an increase in the heat exchange surface area could solve the problem. A third heat exchanger was added in one machine that already possessed two. The results fulfilled the preliminary predictions, eliminating the risk of additional babbitt lining failures. As a consequence of this success modeling, heat exchangers were replaced by stainless steel plate ones in all machines. This alternative solution had a total direct cost of US $600,000.00.

Matheus P. Porto; Licínio C. Porto; Ricardo N.N. Koury; Ernani W. Soares; Fernanda G. Coelho; Luiz Machado

2013-01-01T23:59:59.000Z

470

EVALUATION OF THE FAILURE OF A RADIOACTIVE WASTE TRANSFER LINE JACKET  

SciTech Connect (OSTI)

Radioactive wastes are confined in 49 underground storage tanks at the Savannah River Site. The waste is transported between tanks primarily via an underground transfer piping system. Due to the hazardous nature of the waste, the inner core stainless steel pipe is typically surrounded by a carbon steel pipe jacket, which provides secondary containment. Recently several through-wall penetrations were discovered on a segment of one of the jackets. An evaluation was performed to verify the failure mechanism and to estimate the degree of damage that occurred to the pipe segment. Failure analysis of a section of the jacket confirmed that pitting corrosion on the exterior of the pipe led to the through-wall penetration. Ultrasonic measurements on sections of the pipe were utilized to determine the remaining wall thickness in adjacent areas of the pipe. Based on these measurements, the degree of pitting and general corrosion was determined. Pit growth rate models were then developed to estimate the life expectancy of sections of the pipe that had not been excavated. The calculations estimated that the occurrence of through-wall failures in this jacket will begin to increase substantially in 12 years. Given that this pipe segment will be utilized beyond this time, short-term and long-term solutions to this failure were proposed. The short-term solutions focused on the repair or replace decisions that must be made to return the jacket to service as soon as practical. The long-term solutions focused on a broader strategy to address jacket integrity issues in the entire tank farm facility. These solutions included the evaluation of innovative remote inspection and repair techniques.

Wiersma, B; Alan03 Plummer, A; Karthik Subramanian, K; Charles Jenkins, C; William Hinz, W; A Fellinger, A

2007-04-06T23:59:59.000Z

471

Materials Science and Engineering  

Broader source: Energy.gov (indexed) [DOE]

Materials Science and Engineering Materials Science and Engineering 1 Fe---Cr A lloys f or A dvanced N uclear E nergy A pplica9ons Ron S camodel NFA's at elevated temperature, w ith t he o utcome t hat r adia4on d amage t olerance c an b e improved by increase in the interfacial area/volume ra4o, while also contribu4ng t o g rain s ize s trengthening m echanisms. Materials Science and Engineering 2 Thermodynamic S tabiliza9on o f G rain S ize The concept is that non---equilibrium solutes introduced by mechanical alloying can segregate to grain b oundaries, p roducing

472

NEWTON's Material Science References  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Material Science References Material Science References Do you have a great material science reference link? Please click our Ideas page. Featured Reference Links: Materials Research Society Materials Research Society The Materials Research Society has assembled many resources in its Materials Science Enthusiasts site. This site has information for the K-12 audience, general public, and materials science professionals. Material Science nanoHUB nanHUB.org is the place for nanotechnology research, education, and collaboration. There are Simulation Programs, Online Presentations, Courses, Learning Modules, Podcasts, Animations, Teaching Materials, and more. (Intened for high school and up) Materials Science Resources on the Web Materials Science Resources on the Web This site gives a good general introduction into material science. Sponsered by Iowa State, it talks about what material science is, ceramics and composites, and other topics.

473

Cautionary tales from real world failures for managing security in the cyber world  

Science Journals Connector (OSTI)

Any field of endeavor benefits from a body of knowledge of failures that provide guidance on what to avoid. As a relatively young discipline whose failures can often be handled privately, information security professionals do not have access to the volume ... Keywords: bridges, catastrophic failure, civil engineering, failure, lessons learned

Bill Naber

2010-10-01T23:59:59.000Z

474

Modeling Materials: Comparison of Two Projector-Augmented Wave (PAW) Datasets A paper presented to the faculty of the Department of Physics of Wake Forest University in  

E-Print Network [OSTI]

.2 Software 2.2.1 ATOMPAW 2.2.2 ABINIT 2.2.3 WIEN2K 2.2.4 Brief Summary of Code Usage 2.2.5 Binding Energy of new technologies. A potential focus of this technology is in energy storage. The simulation of new a particularly effective atomic input that would work with several materials simulation software packages. 1

Holzwarth, Natalie

475

hal-00831721,version1-7Jun2013 ent material phases is an appropriate and convenient tool for modelling the phase  

E-Print Network [OSTI]

the general nonlinear theory of shells with an account of occurence of phase transformation in the shell for modelling the phase interface in thin-walled shell structures. It is surprising, however, that we are not aware of any complete theoretical model of phase transitions in shells proposed in the literature

Boyer, Edmond

476

Risk assessment of turbine rotor failure using probabilistic ultrasonic non-destructive evaluations  

SciTech Connect (OSTI)

The study presents a method and application of risk assessment methodology for turbine rotor fatigue failure using probabilistic ultrasonic nondestructive evaluations. A rigorous probabilistic modeling for ultrasonic flaw sizing is developed by incorporating the model-assisted probability of detection, and the probability density function (PDF) of the actual flaw size is derived. Two general scenarios, namely the ultrasonic inspection with an identified flaw indication and the ultrasonic inspection without flaw indication, are considered in the derivation. To perform estimations for fatigue reliability and remaining useful life, uncertainties from ultrasonic flaw sizing and fatigue model parameters are systematically included and quantified. The model parameter PDF is estimated using Bayesian parameter estimation and actual fatigue testing data. The overall method is demonstrated using a realistic application of steam turbine rotor, and the risk analysis under given safety criteria is provided to support maintenance planning.

Guan, Xuefei; Zhang, Jingdan; Zhou, S. Kevin [Siemens Corporation, Corporate Technology, 755 College Rd. E., Princeton NJ 08540 (United States); Rasselkorde, El Mahjoub; Abbasi, Waheed A. [Siemens Energy Inc., 841 Old Frankstown Road, Pittsburgh PA 15239 (United States)

2014-02-18T23:59:59.000Z

477

Estimation of the minimum shielding failure flashover current for first and subsequent lightning strokes to overhead transmission lines  

Science Journals Connector (OSTI)

Abstract ATP-EMTP simulations are performed to estimate the minimum shielding failure current causing flashover in overhead transmission lines with operating voltage in the range of 66 kV up to 735 kV. This critical current, affecting shielding failure flashover rate, is of great importance for assessing the insulation coordination of overhead transmission lines and the connected substations. The minimum shielding failure current causing flashover of line insulation is highly dependent upon insulator string flashover modelling and, also, markedly higher than that calculated according to the relevant IEEE Std 1243-1997 simplified expression. A modification of the latter is suggested by using multiplication factors of 1.5 and 1.65 for first and subsequent lightning strokes, respectively, so as to account for the increased dielectric strength of line insulator strings under non-standard lightning overvoltage surges. Alternatively, the critical currents can be respectively estimated by using average negative breakdown gradients per unit length of insulator string of 680 kV/m and 750 kV/m. The shielding failure flashover rate of the overhead transmission lines, being greatly influenced by insulator string flashover modelling, is lower than that obtained based on the critical current according to IEEE Std 1243-1997.

Zacharias G. Datsios; Pantelis N. Mikropoulos; Thomas E. Tsovilis

2014-01-01T23:59:59.000Z

478

Educational Material Science Games  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Material Science Games Material Science Games Do you have a great material science game? Please click our Ideas page. Featured Games: >KS2 Bitsize BBC - Materials KS2 Bitsize BBC - Materials Sponsored by the BBC, K2S Bitsize offers tons of free online science games including a section on materials. Learn about the changes in materials, changing states, heat, rocks, soils, solids, liquids, gases, and much more. Science Kids - Properties of Materials Science Kids - Properties of Materials Learn about the properties of materials as you experiment with a variety of objects in this great science activity for kids. Discover the interesting characteristics of materials; are they flexible, waterproof, strong or transparent? Characteristics of Materials - BBC Schools Characteristics of Materials - BBC Schools

479

Importance of the gas phase role to the prediction of energetic material behavior: An experimental study  

SciTech Connect (OSTI)

Various thermal (radiative, conductive, and convective) initiation experiments are performed to demonstrate the importance of the gas phase role in combustion modeling of energetic materials (EM). A previously published condensed phase model that includes a predicted critical irradiance above which ignition is not possible is compared to experimental laser ignition results for octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) and 2,4,6-trinitrotoluene (TNT). Experimental results conflict with the predicted critical irradiance concept. The failure of the model is believed to result from a misconception about the role of the gas phase in the ignition process of energetic materials. The model assumes that ignition occurs at the surface and that evolution of gases inhibits ignition. High speed video of laser ignition, oven cook-off and hot wire ignition experiments captures the ignition of HMX and TNT in the gas phase. A laser ignition gap test is performed to further evaluate the effect of gas phase laser absorption and gas phase disruption on the ignition process. Results indicate that gas phase absorption of the laser energy is probably not the primary factor governing the gas phase ignition observations. It is discovered that a critical gap between an HMX pellet and a salt window of 6 mm{+-}0.4 mm exists below which ignition by CO{sub 2} laser is not possible at the tested irradiances of 29 W/cm{sup 2} and 38 W/cm{sup 2} for HMX ignition. These observations demonstrate that a significant disruption of the gas phase, in certain scenarios, will inhibit ignition, independent of any condensed phase processes. These results underscore the importance of gas phase processes and illustrate that conditions can exist where simple condensed phase models are inadequate to accurately predict the behavior of energetic materials.

Ali, A.N.; Son, S.F.; Asay, B.W.; Sander, R.K. [Los Alamos National Laboratory, MS C920, Los Alamos, New Mexico 87544 (United States)

2005-03-15T23:59:59.000Z

480

Catheter Ablation for Atrial Fibrillation in Congestive Heart Failure  

Science Journals Connector (OSTI)

...of antiarrhythmic drugs is challenging, owing to the limited efficacy and potentially deleterious effects of the drugs.– This finding has led to renewed interest in rate control, stimulated by reports on several important studies,– particularly the Atrial Fibrillation Follow-up Investigation of Rhythm... In patients with heart failure, atrial fibrillation may exacerbate ventricular dysfunction and symptoms. In this study, catheter ablation was performed to restore sinus rhythm in patients with heart failure and refractory atrial fibrillation. The results show improvement in the left ventricular ejection fraction, symptoms, exercise capacity, and quality of life.

Hsu L.-F.; Jaïs P.; Sanders P.

2004-12-02T23:59:59.000Z

Note: This page contains sample records for the topic "material failure model" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Investigation of valve failure problems in LWR power plants  

SciTech Connect (OSTI)

An analysis of component failures from information in the computerized Nuclear Safety Information Center (NSIC) data bank shows that for both PWR and BWR plants the component category most responsible for approximately 19.3% of light water reactor (LWR) power plant shutdowns. This investigation by Burns and Roe, Inc. shows that the greatest cause of shutdowns in LWRs due to valve failures is leakage from valve stem packing. Both BWR plants and PWR plants have stem leakage problems (BWRs, 21% and PWRs, 34%).

None

1980-04-01T23:59:59.000Z

482

Falling behind, failure and drop outs in Mexican public universities: Autonomous University of Chihuahua (Mexico) case  

Science Journals Connector (OSTI)

The subject deals with the concepts of falling behind, failure and drop outs as the main indicators to the academic measuring methods in Mexican public universities, complemented by the national proposal to establish institutional tutorial models as the probable solution for the reduction of such indicators. In addition, it includes the outcomes of diagnostic studies performed at the Autonomous University of Chihuahua, Mexico, taking into consideration the outstanding findings about the causes that provoke such problems, and distinguish its behaviour among students coursing educative programs with social approach and its comparison to those related to sciences.

Javier Tarango

2006-01-01T23:59:59.000Z

483

Phenomenological model of the accumulation of a space charge by high-energy injection of electrons in high-resistivity materials  

Science Journals Connector (OSTI)

The assumption of a constant ratio of the density of free carriers to the total carrier density in the process of electron injection is used to develop a phenomenological model of the accumulation of a space c...

O. B. Evdokimov; Yu. A. Solov'ev

1980-05-01T23:59:59.000Z

484

Progress in the Research Programs to Elucidate Axial Cracking Fuel Failure at High Burnup  

SciTech Connect (OSTI)

A fuel failure with an axial crack starting outside the cladding and penetrating inwards was experienced by high burnup BWR fuel rods in power ramp test. On the other hand, no fuel failure caused by power ramp test has been currently reported on PWR fuel rods at burnups higher than 50 GWd/t. Extensive research programs regarding hydrogen behaviors and mechanical performances on irradiated BWR and PWR fuel claddings have been carried out to clarify the mechanism of the axial cracking and to quantify the conditions to cause fuel failure. Hydrogen solid solubility measurement on irradiated Zircaloy-2 materials showed almost comparable results to those on unirradiated ones. Hydride re-distribution and re-orientation behaviors were tested by heating irradiated BWR claddings with Zr-liner under the conditions of applied radial heat flux (temperature gradient) and circumferential stress. Mechanical performances of BWR claddings were evaluated mainly by the internal pressurizing tests. Internal pressurization tests applying various pressurizing sequences, e.g. stepwise increase in pressure with holding intervals, were also conducted to simulate crack propagation behaviors. Some specimens demonstrated characteristic fracture surfaces similar to those observed on the failed fuel rods after the power ramp. Mechanical performances of irradiated PWR claddings were tested at temperatures of 573 to 723 K. Metallographic examination after tensile tests revealed a large number of incipient cracks within the region of cladding outer rim where a concentrated hydride layer (hydride rim) has been formed during irradiation. Crack propagation test using an expanding mandrel device demonstrated the crack propagation at 573 K but no propagation at 658 K. (authors)

Ogata, Keizo; Aomi, Masaki; Baba, Toshikazu; Kamimura, Katsuichiro [Japan Nuclear Energy Safety Organization, 3-17-1 Toranomon, Minato-ku, Tokyo 105-0001 (Japan); Etoh, Yoshinori [Nippon Nuclear Fuel Development Co., Ltd., 2163 Narita-cho, Oarai-machi, Ibaraki 311-1313 (Japan); Ito, Kunio [Grobal Nuclear Fuel - Japan Co., Ltd., 3-1 Uchikawa 2-chone, Yokosuka 239-0836 (Japan); Kido, Toshiya [Nuclear Development Corporation, 622-12 Funaishikawa, Tokai-mura, Ibaraki 319-1111 (Japan); Teshima, Hideyuki [Mitsubishi Heavy Industries, Ltd. 1-1, Wadasaki-cho 1-chome, Hyogo-ku, Kobe 652-8585 (Japan)

2007-07-01T23:59:59.000Z

485

Rebuilding Greensburg, Kansas, as a Model Green Community: A Case Study; NREL's Technical Assistance to Greensburg, June 2007-May 2009; Appendix H: Educational and Outreach Materials  

Broader source: Energy.gov (indexed) [DOE]

7 7 Appendix H: Educational and Outreach Materials Page H.1 Rebuilding After Disaster-Going Green from the Ground Up ............... 608 H.2 Greensburg, Kansas-A Better, Greener Place to Live ......................... 633 H.3 From Tragedy to Triumph-Rebuilding Green Homes after Disaster ..... 642 H.4 From Tragedy to Triumph-Rebuilding Green Buildings after Disaster . 647 H.5 From Tragedy to Triumph-Rebuilding with Renewable Energy after Disaster .................................................................................................. 652 H.6 From Tragedy to Triumph-Resources for Rebuilding Green after Disaster .................................................................................................. 657 H.7 Rebuilding It Better-BTI-Greensburg John Deere Dealership .............. 662

486

Hardness-based plasticity and fracture model for quench-hardenable boron steel (22MnB5)  

SciTech Connect (OSTI)

A comprehensive strain hardening and fracture characterization of different grades of boron steel blanks has been performed, providing the foundation for the implementation into the modular material model (MMM) framework developed by Volkswagen Group Research for an explicit crash code. Due to the introduction of hardness-based interpolation rules for the characterized main grades, the hardening and fracture behavior is solely described by the underlying Vickers hardness. In other words, knowledge of the hardness distribution within a hot-formed component is enough to set up the newly developed computational model. The hardness distribution can be easily introduced via an experimentally measured hardness curve or via hardness mapping from a corresponding hot-forming simulation. For industrial application using rather coarse and computationally inexpensive shell element meshes, the user material model has been extended by a necking/post-necking model with reduced mesh-dependency as an additional failure mode. The present paper mainly addresses the necking/post-necking model.

Greve, L., E-mail: lars.greve@volkswagen.de; Medricky, M., E-mail: miloslav.medricky@volkswagen.de; Andres, M., E-mail: miloslav.medricky@volkswagen.de [Volkswagen AG, Letter Box 1777, Wolfsburg, 38436 (Germany); Eller, T. K., E-mail: tom.karl.eller@volkswagen.de [Volkswagen AG, Letter Box 1777, Wolfsburg, 38436, Germany, and University of Twente, P.O. Box 217, 7500 AE Enschede (Netherlands)

2013-12-16T23:59:59.000Z

487

ON-LINE THERMAL BARRIER COATING MONITORING FOR REAL-TIME FAILURE PROTECTION AND LIFE MAXIMIZATION  

SciTech Connect (OSTI)

Under the sponsorship of the U. S. Department of Energy's National Energy Laboratory, Siemens Westinghouse Power Corporation proposes a four year program titled, ''On-Line Thermal Barrier Coating (TBC) Monitor for Real-Time Failure Protection and Life Maximization,'' to develop, build and install the first generation of an on-line TBC monitoring system for use on land-based advanced gas turbines (AGT). Federal deregulation in electric power generation has accelerated power plant owner's demand for improved reliability availability maintainability (RAM) of the land-based advanced gas turbines. As a result, firing temperatures have been increased substantially in the advanced turbine engines, and the TBCs have been developed for maximum protection and life of all critical engine components operating at these higher temperatures. Losing TBC protection can therefore accelerate the degradation of substrate components materials and eventually lead to a premature failure of critical component and costly unscheduled power outages. This program seeks to substantially improve the operating life of high cost gas turbine components using TBC; thereby, lowering the cost of maintenance leading to lower cost of electricity. Siemens Westinghouse Power Corporation has teamed with Indigo Systems, a supplier of state-of-the-art infrared camera systems, and Wayne State University, a leading research organization in the field of infrared non-destructive examination (NDE), to complete the program.

Dennis H. LeMieux

2002-04-01T23:59:59.000Z

488

On-Line Thermal Barrier Coating Monitoring for Real-Time Failure Protection and Life Maximization  

SciTech Connect (OSTI)

Under the sponsorship of the U. S. Department of Energy's National Energy Laboratory, Siemens Power Generation, Inc proposed a four year program titled, ''On-Line Thermal Barrier Coating (TBC) Monitor for Real-Time Failure Protection and Life Maximization'', to develop, build and install the first generation of an on-line TBC monitoring system for use on land-based advanced gas turbines (AGT). Federal deregulation in electric power generation has accelerated power plant owner's demand for improved reliability availability maintainability (RAM) of the land-based advanced gas turbines. As a result, firing temperatures have been increased substantially in the advanced turbine engines, and the TBCs have been developed for maximum protection and life of all critical engine components operating at these higher temperatures. Losing TBC protection can therefore accelerate the degradation of substrate components materials and eventually lead to a premature failure of critical component and costly unscheduled power outages. This program seeks to substantially improve the operating life of high cost gas turbine components using TBC; thereby, lowering the cost of maintenance leading to lower cost of electricity. Siemens Power Generation, Inc. has teamed with Indigo Systems, a supplier of state-of-the-art infrared camera systems, and Wayne State University, a leading research organization in the field of infrared non-destructive examination (NDE), to complete the program.

Dennis H. LeMieux

2005-10-01T23:59:59.000Z

489

ON-LINE THERMAL BARRIER COATING MONITORING FOR REAL-TIME FAILURE PROTECTION AND LIFE MAXIMIZATION  

SciTech Connect (OSTI)

Under the sponsorship of the U. S. Department of Energy's National Energy Laboratory, Siemens Westinghouse Power Corporation proposes a four year program titled, ''On-Line Thermal Barrier Coating (TBC) Monitor for Real-Time Failure Protection and Life Maximization,'' to develop, build and install the first generation of an on-line TBC monitoring system for use on land-based advanced gas turbines (AGT). Federal deregulation in electric power generation has accelerated power plant owner's demand for improved reliability, availability, and maintainability (RAM) of the land-based advanced gas turbines. As a result, firing temperatures have been increased substantially in the advanced turbine engines, and the TBCs have been developed for maximum protection and life of all critical engine components operating at these higher temperatures. Losing TBC protection can, therefore, accelerate the degradation of substrate component materials and eventually lead to a premature failure of critical components and costly unscheduled power outages. This program seeks to substantially improve the operating life of high cost gas turbine components using TBC; thereby, lowering the cost of maintenance leading to lower cost of electricity. Siemens Westinghouse Power Corporation has teamed with Indigo Systems, a supplier of state-of-the-art infrared camera systems, and Wayne State University, a leading research organization in the field of infrared non-destructive examination (NDE), to complete the program.

Dennis H. LeMieux

2003-07-01T23:59:59.000Z

490

On-Line Thermal Barrier Coating Monitoring for Real-Time Failure Protection and Life Maximization  

SciTech Connect (OSTI)

Under the sponsorship of the U. S. Department of Energy's National Energy Laboratory, Siemens Westinghouse Power Corporation proposes a four year program titled, ''On-Line Thermal Barrier Coating (TBC) Monitor for Real-Time Failure Protection and Life Maximization'', to develop, build and install the first generation of an on-line TBC monitoring system for use on land-based advanced gas turbines (AGT). Federal deregulation in electric power generation has accelerated power plant owner's demand for improved reliability availability maintainability (RAM) of the land-based advanced gas turbines. As a result, firing temperatures have been increased substantially in the advanced turbine engines, and the TBCs have been developed for maximum protection and life of all critical engine components operating at these higher temperatures. Losing TBC protection can therefore accelerate the degradation of substrate components materials and eventually lead to a premature failure of critical component and costly unscheduled power outages. This program seeks to substantially improve the operating life of high cost gas turbine components using TBC; thereby, lowering the cost of maintenance leading to lower cost of electricity. Siemens Westinghouse Power Corporation has teamed with Indigo Systems, a supplier of state-of-the-art infrared camera systems, and Wayne State University, a leading research organization in the field of infrared non-destructive examination (NDE), to complete the program.

Dennis H. LeMieux

2005-04-01T23:59:59.000Z

491

On-Line Thermal Barrier Coating Monitoring for Real-Time Failure Protection and Life Maximization  

SciTech Connect (OSTI)

Under the sponsorship of the U. S. Department of Energy's National Energy Laboratory, Siemens Westinghouse Power Corporation proposes a four year program titled, ''On-Line Thermal Barrier Coating (TBC) Monitor for Real-Time Failure Protection and Life Maximization'', to develop, build and install the first generation of an on-line TBC monitoring system for use on land -based advanced gas turbines (AGT). Federal deregulation in electric power generation has accelerated power plant owner's demand for improved reliability availability maintainability (RAM) of the land-based advanced gas turbines. As a result, firing temperatures have been increased substantially in the advanced turbine engines, and the TBCs have been developed for maximum protection and life of all critical engine components operating at these higher temperatures. Losing TBC protection can therefore accelerate the degradation of substrate components materials and eventually lead to a premature failure of critical component and costly unscheduled power outages. This program seeks to substantially improve the operating life of high cost gas turbine components using TBC; thereby, lowering the cost of maintenance leading to lower cost of electricity. Siemens Westinghouse Power Corporation has teamed with Indigo Systems; a supplier of state-of-the-art infrared camera systems, and Wayne State University, a leading research organization.

Dennis H. LeMieux

2004-10-01T23:59:59.000Z

492

ON-LINE THERMAL BARRIER COATING MONITORING FOR REAL-TIME FAILURE PROTECTION AND LIFE MAXIMIZATION  

SciTech Connect (OSTI)

Under the sponsorship of the U. S. Department of Energy's National Energy Laboratory, Siemens Westinghouse Power Corporation proposes a four year program titled, ''On-Line Thermal Barrier Coating (TBC) Monitor for Real-Time Failure Protection and Life Maximization,'' to develop, build and install the first generation of an on-line TBC monitoring system for use on land-based advanced gas turbines (AGT). Federal deregulation in electric power generation has accelerated power plant owner's demand for improved reliability, avail