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Note: This page contains sample records for the topic "outstanding mechanical properties" 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.


1

Mechanical Properties of Nanocrystal Supercrystals  

E-Print Network [OSTI]

and Its Impact on Mechanical Properties. MacromoleculesO. L. ; Minor, A. M. , Mechanical annealing and source-Mechanical Properties of Nanocrystal Supercrystals Enrico

Tam, Enrico

2010-01-01T23:59:59.000Z

2

Polymer Nanofibers with Outstanding Thermal Conductivity and Thermal Stability: Fundamental Linkage between Molecular Characteristics and Macroscopic Thermal Properties  

E-Print Network [OSTI]

Polymer nanofibers with high thermal conductivities and outstanding thermal stabilities are highly desirable in heat transfer-critical applications such as thermal management, heat exchangers and energy storage. In this work, we unlock the fundamental relations between the thermal conductivity and thermal stability of polymer nanofibers and their molecular characteristics by studying the temperature-induced phase transitions and thermal transport of a series of polymer nanofibers. Ten different polymer nanofibers with systematically chosen molecular structures are studied using large scale molecular dynamics simulations. We found that high thermal conductivity and good thermal stability can be achieved in polymers with rigid backbones, exemplified by {\\pi}-conjugated polymers, due to suppressed segmental rotations and large phonon group velocities. The low probability of segmental rotation does not only prevent temperature-induced phase transition but also enables long phonon mean free paths due to reduced di...

Zhang, Teng; Luo, Tengfei

2014-01-01T23:59:59.000Z

3

Putnam recognized for outstanding service  

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

Distinguished Performance Award to Michael Borland Distinguished Performance Award to Michael Borland Mariana Varotto honored as "Role Model" Art and Science Join Together at the Advanced Photon Source Argonne's Joachimiak and Rosenbaum Honored with 2007 Compton Award First light for MERIX APS News Archives: 2012 | 2011 | 2010 | 2009 2008 | 2007 | 2006 | 2005 2004 | 2003 | 2002 | 2001 2000 Subscribe to APS News rss feed Putnam recognized for outstanding service JUNE 18, 2007 Bookmark and Share Rick Putnam with some de-energized spare APS storage ring magnets. Cedric "Rick" Putnam of the APS Engineering and Support Division (AES) Mechanical Operations and Maintenance Group is one of four Argonne employees to be presented with The University of Chicago Board of Governors for Argonne Outstanding Service Award for 2007.

4

Zircaloy cladding mechanical properties  

Science Journals Connector (OSTI)

This paper is concerned with life-limiting aspects of the Zircaloy cladding material, with emphasis on the fuel-clad interaction type of failure. The tensile test and creep properties and the changes of these due to neutron irradiation are reviewed. A section on high temperature properties of interest in loss-of-coolant accident (LOCA) analysis is also included. The paper is concluded with a discussion of the optimum choice of cladding material properties and the basis of the data reviewed.

K. Hannerz; G. Vesterlund

1975-01-01T23:59:59.000Z

5

MECHANICAL PROPERTIES OF POROUS PNZT POLYCRYSTALLINE CERAMICS  

E-Print Network [OSTI]

F. P. Knudsen, "Dependence of Mechanical Strength of BrittleMicrostruc- ture on the Mechanical Properties of Ceramics,"of Porosity on the Mechanical Properties of Lead Zirconate-

Biswas, D.R.

2010-01-01T23:59:59.000Z

6

Electrical and Mechanical Properties of Graphene  

E-Print Network [OSTI]

Nano Letters, 5 [67] G. Liu, Electrical Transport in CarbonOF CALIFORNIA RIVERSIDE Electrical and Mechanical PropertiesOF THE DISSERTATION Electrical and Mechanical Properties of

Bao, Wenzhong

2011-01-01T23:59:59.000Z

7

Awards recognize outstanding innovation in Technology Transfer  

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

recognize outstanding innovation Awards recognize outstanding innovation in Technology Transfer The award honors inventors whose patented invention exhibits significant...

8

Mechanical Property Data for Fiberboard  

SciTech Connect (OSTI)

The 9975 shipping package incorporates a cane fiberboard overpack for thermal insulation and impact resistance. Mechanical properties (tensile and compressive behavior) have been measured on cane fiberboard and a similar wood-based product following short-term conditioning in several temperature/humidity environments. Both products show similar trends, and vary in behavior with material orientation, temperature and humidity. A memory effect is also seen in that original strength values are only partially recovered following exposure to a degrading environment and return to ambient conditions.

WILLIAM, daugherty

2004-12-14T23:59:59.000Z

9

Sandia National Laboratories: Sandian Selected for Outstanding...  

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

ClimateECEnergySandian Selected for Outstanding Engineer Award Sandian Selected for Outstanding Engineer Award Sandia Video Featured by DOE Bioenergy Technologies Office Parallel...

10

Enhancement of mechanical properties of 123 superconductors  

DOE Patents [OSTI]

A composition and method of preparing YBa.sub.2 Cu.sub.3 O.sub.7-x superconductor. Addition of tin oxide containing compounds to YBCO superconductors results in substantial improvement of fracture toughness and other mechanical properties without affect on T.sub.c. About 5-20% additions give rise to substantially improved mechanical properties.

Balachandran, Uthamalingam (Hinsdale, IL)

1995-01-01T23:59:59.000Z

11

Enhancement of mechanical properties of 123 superconductors  

DOE Patents [OSTI]

A composition and method are disclosed of preparing YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} superconductor. Addition of tin oxide containing compounds to YBCO superconductors results in substantial improvement of fracture toughness and other mechanical properties without affect on T{sub c}. About 5-20% additions give rise to substantially improved mechanical properties.

Balachandran, U.

1995-04-25T23:59:59.000Z

12

Mechanical property measurement by indentation techniques  

E-Print Network [OSTI]

The mechanical properties of materials are usually evaluated by performing a tensile or hardness test on the sample. Tensile tests are often time consuming, destructive and need specially prepared specimens. On the other hand, there is no direct...

Janakiraman, Balasubramanian

2006-04-12T23:59:59.000Z

13

Argonne honors employees for outstanding performance | Argonne...  

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

honors employees for outstanding performance August 15, 2013 Tweet EmailPrint ARGONNE, Ill. (Aug. 13, 2013) -- On Thursday, Aug. 15, 2013, the UChicago Argonne, LLC, Board of...

14

The mechanical properties of FeAl  

SciTech Connect (OSTI)

Only in the last few years has progress been made in obtaining reproducible mechanical properties data for FeAl. Two sets of observations are the foundation of this progress. The first is that the large vacancy concentrations that exist in FeAl at high temperature are easily retained at low temperature and that these strongly affect the low-temperature mechanical properties. The second is that RT ductility is adversely affected by water vapor. Purpose of this paper is not to present a comprehensive overview of the mechanical properties of FeAl but rather to highlight our understanding of key phenomena and to show how an understanding of the factors which control the yield strength and fracture behavior has followed the discovery of the above two effects. 87 refs, 9 figs.

Baker, I. [Dartmouth Coll., Hanover, NH (United States); George, E.P. [Oak Ridge National Lab., TN (United States)

1996-12-31T23:59:59.000Z

15

Mechanical Properties of Ingot Nb Cavities  

SciTech Connect (OSTI)

This contribution presents the results of measurements of the resonant frequency and of strain along the contour of a single-cell cavity made of ingot Nb subjected to increasing uniform differential pressure, up to 6 atm. The data were used to infer mechanical properties of this material after cavity fabrication, by comparison with the results from simulation calculations done with ANSYS. The objective is to provide useful information about the mechanical properties of ingot Nb cavities which can be used in the design phase of SRF cavities intended to be built with this material.

Ciovati, Gianluigi; Dhakal, Pashupati; Kneisel, Peter; Mammosser, John; Matalevich, Joseph; Rao Myneni, Ganapati

2014-07-01T23:59:59.000Z

16

Microstructure and mechanical property of turtle shell  

Science Journals Connector (OSTI)

The turtle shell is an amazing structure optimized through the long-term evolution by nature. This paper reports the experimental study on the mechanical property at different levels and locations and the microstructure of the shell from Trachemys scripta (Red-ear turtle) living in South China.

Wei Zhang; Chengwei Wu; Chenzhao Zhang; Zhen Chen

2012-01-01T23:59:59.000Z

17

Mechanical Properties of Structural Steels in Hydrogen  

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

Mechanical Properties of Mechanical Properties of Structural Steels in Hydrogen B.P. Somerday, K.A. Nibur, C. San Marchi, and M. Yip Sandia National Laboratories Livermore, CA DOE Hydrogen Pipeline Working Group Meeting Aiken, SC September 25-26, 2007 H H H dδ/dt ≥ 0 H 2 H 2 Methods for measuring mechanical properties of structural steels in hydrogen dδ/dt > 0 dδ/dt > 0 strength of materials: σ UTS , σ YS , ε f , RA H 2 H H H H 2 H H 2 H H 2 H H H 2 H H 2 fracture mechanics: K IH , K TH H H H H H H H H H H dδ/dt ≥ 0 H H H H H H H H H H H H H H H 2 H 2 H 2 H 2 H 2 H 2 Tensile Testing Carbon Steel in H 2 E x t r u s i o n D i r e c t i o n / L - C O r i e n t a t i o n T T B a s e H A Z W e l d W e l d * Alloys: 106 Grade B * Multi-pass SMAW w/out stress relief * Specimens machined in 3 conditions: Base metal, Weld and HAZ * Orientation: L-C

18

Awards recognize outstanding LANL Tech Transfer  

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

Outstanding Tech Transfer awards Outstanding Tech Transfer awards Awards recognize outstanding LANL Tech Transfer Awards were given for distinguished accomplishments in patenting, copyright, licensing, programmatic impact, and regional impact during fiscal year 2009. August 23, 2010 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials.

19

Polyethylene Terephthalate / clay nanocomposites. Compounding, fabrication and characterisation of the thermal, rheological, barrier and mechanical properties of Polyethylene Terephthalate / clay nanocomposites.  

E-Print Network [OSTI]

??Polyethylene Terephthalate (PET) is one of the most important polymers in use today for packaging due to its outstanding properties. The usage of PET has (more)

Al-Fouzan, Abdulrahman M.

2011-01-01T23:59:59.000Z

20

Distinguished Engineering Graduate Outstanding Young Engineering Graduate  

E-Print Network [OSTI]

, or service delivery through the application of engineering principles; or · Contributed truly exceptional2013 Distinguished Engineering Graduate and Outstanding Young Engineering Graduate Award Nomination Form Print Form #12;The highest honor the Cockrell School of Engineering can bestow on one of its own

Lightsey, Glenn

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Mechanical Properties of Nuclear Fuel Surrogates using Picosecond Laser Ultrasonics  

SciTech Connect (OSTI)

Detailed understanding between microstructure evolution and mechanical properties is important for designing new high burnup nuclear fuels. In this presentation we discuss the use of picosecond ultrasonics to measure localize changes in mechanical properties of fuel surrogates. We develop measurement techniques that can be applied to investigate heterogeneous elastic properties caused by localize changes in chemistry, grain microstructure caused by recrystallization, and mechanical properties of small samples prepared using focused ion beam sample preparation. Emphasis is placed on understanding the relationship between microstructure and mechanical properties

David Hurley; Marat Khafizov; Farhad Farzbod; Eric Burgett

2013-05-01T23:59:59.000Z

22

Mechanical properties of thermal protection system materials.  

SciTech Connect (OSTI)

An experimental study was conducted to measure the mechanical properties of the Thermal Protection System (TPS) materials used for the Space Shuttle. Three types of TPS materials (LI-900, LI-2200, and FRCI-12) were tested in 'in-plane' and 'out-of-plane' orientations. Four types of quasi-static mechanical tests (uniaxial tension, uniaxial compression, uniaxial strain, and shear) were performed under low (10{sup -4} to 10{sup -3}/s) and intermediate (1 to 10/s) strain rate conditions. In addition, split Hopkinson pressure bar tests were conducted to obtain the strength of the materials under a relatively higher strain rate ({approx}10{sup 2} to 10{sup 3}/s) condition. In general, TPS materials have higher strength and higher Young's modulus when tested in 'in-plane' than in 'through-the-thickness' orientation under compressive (unconfined and confined) and tensile stress conditions. In both stress conditions, the strength of the material increases as the strain rate increases. The rate of increase in LI-900 is relatively small compared to those for the other two TPS materials tested in this study. But, the Young's modulus appears to be insensitive to the different strain rates applied. The FRCI-12 material, designed to replace the heavier LI-2200, showed higher strengths under tensile and shear stress conditions. But, under a compressive stress condition, LI-2200 showed higher strength than FRCI-12. As far as the modulus is concerned, LI-2200 has higher Young's modulus both in compression and in tension. The shear modulus of FRCI-12 and LI-2200 fell in the same range.

Hardy, Robert Douglas; Bronowski, David R.; Lee, Moo Yul; Hofer, John H.

2005-06-01T23:59:59.000Z

23

Mechanical and biochemical properties of human cervical tissue  

E-Print Network [OSTI]

The mechanical integrity of cervical tissue is crucial for maintaining a healthy gestation. Altered tissue biochemistry can cause drastic changes in the mechanical properties of the cervix and contribute to premature ...

Myers, Kristin M

2005-01-01T23:59:59.000Z

24

Mechanical Properties of Structural Steels in Hydrogen | Department...  

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

Mechanical Properties of Structural Steels in Hydrogen Presented at the DOE Hydrogen Pipeline Working Group Meeting, Aiken, SC, September 25-26, 2007 pipelinegroupsomerdayms.pd...

25

Electrical and Optical As polymer materials have developed, their excellent and sometimes outstanding  

E-Print Network [OSTI]

4 Electrical and Optical Properties As polymer materials have developed, their excellent and sometimes outstanding dielectric properties have guaranteed their widespread use as insulants in electrical and electronic engineering. In the nineteenth and early twentieth centuries electrical apparatus relied on wood

Hall, Christopher

26

Electrical and Mechanical Properties of Graphene  

E-Print Network [OSTI]

in nanosclae system and fundamental electronic properties ofelectronic transport in nanosclae system including quantum Hall effect, followed by a discussion of fundamental

Bao, Wenzhong

2011-01-01T23:59:59.000Z

27

Pantex recognized for outstanding community service | National Nuclear  

National Nuclear Security Administration (NNSA)

recognized for outstanding community service | National Nuclear recognized for outstanding community service | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > NNSA Blog > Pantex recognized for outstanding community service Pantex recognized for outstanding community service Posted By Office of Public Affairs Pantex recognized for outstanding community service

28

Pantex recognized for outstanding community service | National Nuclear  

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

recognized for outstanding community service | National Nuclear recognized for outstanding community service | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > NNSA Blog > Pantex recognized for outstanding community service Pantex recognized for outstanding community service Posted By Office of Public Affairs Pantex recognized for outstanding community service

29

Mechanical Properties of Lithium-Ion Battery Separator Materials  

E-Print Network [OSTI]

Mechanical Properties of Lithium-Ion Battery Separator Materials Patrick Sinko B.S. Materials Science and Engineering 2013, Virginia Tech John Cannarella PhD. Candidate Mechanical and Aerospace and motivation ­ Why study lithium-ion batteries? ­ Lithium-ion battery fundamentals ­ Why study the mechanical

Petta, Jason

30

THE MECHANICAL PROPERTIES AND MICROSTRUCTURAL RELATIONSHIPS IN IRON-MANGANESE-CHROMIUM ALLOYS  

E-Print Network [OSTI]

Heat Treatment . . . Mechanical Testing E. F. G. TensileEXPERIHENTAL RESULTS A. Mechanical Properties Tensilein B. Alloys Sigma Phase Mechanical Property Evaluation 14:

Thompson, L.D.

2010-01-01T23:59:59.000Z

31

Mechanical and electronic-structure properties of compressed CdSe tetrapod nanocrystals  

E-Print Network [OSTI]

Mechanical and electronic-structure properties of compressed94720 USA The coupling of mechanical and optical propertiestheoretical examination of the mechanical properties of CdSe

Schrier, Joshua; Lee, Byounghak; Wang, Lin-Wang

2008-01-01T23:59:59.000Z

32

Mechanical Properties of Glassy Polyethylene Nanofibers via Molecular Dynamics Simulations  

E-Print Network [OSTI]

The extent to which the intrinsic mechanical properties of polymer fibers depend on physical size has been a matter of dispute that is relevant to most nanofiber applications. Here, we report the elastic and plastic ...

Buell, Sezen

33

Engineering the Microstructure of Hydrogels to Achieve Enhanced Mechanical Properties  

E-Print Network [OSTI]

Hydrogels are three-dimensional, cross-linked, polymeric networks that are typically soft materials that contain more than 90% water. Many technologies require hydrogels with improved mechanical properties (modulus, failure ...

Suekama, Tiffany

2014-05-31T23:59:59.000Z

34

An evaluation of the critical mechanical properties of filled elastomers  

E-Print Network [OSTI]

AN EVALUATION OF THE CRITICAL MECHANICAL PROPERTIES OF FILLED ELASTOMERS A Thesis By PATRICK ARTHUR GIBSON Submitted to the Graduate College of the Texas ASM University in partial fulfillment of the requirements for the degree of MASTER... possible. ABSTRACT An Evaluation of the Critical Mechanical Properties of Filled Elastomers Patrick A. Gibson, B. S. , Texas ASM University Directed by: Dr. William B. Ledbetter A test procedure is developed for the uniaxial tensile testing...

Gibson, Patrick Arthur

2012-06-07T23:59:59.000Z

35

Mechanical properties of radial truck tires  

E-Print Network [OSTI]

determination of static properties of tire load vs. tire deflection and tire load vs. tire footprint area for radial and wide base radial truck tires is described and results are discussed. Determination of transmissibility for a conventional radial and a... (right) 12 13 15 Figure 7: Sidewall bulge measurement 16 Figure 8: Load vs. deflection; 385/65R22. 5 wide base tire tested at 90 psi inflation pressure 20 Figure 9: Load vs. deflection; 385/65R22. 5 wide base tire tested at 100 psi inflation...

Wasti, Mansoor-ul-Hassan

1992-01-01T23:59:59.000Z

36

Mechanical Properties of Porous-Matrix Ceramic Composites**  

E-Print Network [OSTI]

requirements of high-temperature components for future gas turbine engine technologies becomes realizable). These mechanisms per- mit the development of multiple matrix cracks, which in turn produce inelastic strain during/Mechanical Properties of Porous-Matrix Ceramic Composites REVIEWS The porous matrix concept has been developed primarily

Zok, Frank

37

NSC nears move completion with outstanding safety record | National...  

National Nuclear Security Administration (NNSA)

nears move completion with outstanding safety record | National Nuclear Security Administration Facebook Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing...

38

ORISE: Supporting DOE's mission to recognize outstanding scientists...  

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

Education Supporting DOE's Mission to Recognize Outstanding Scientists, Engineers ORISE peer review group managed two reviews and three award ceremonies for science and...

39

Mechanical and Elastic Property Evaluation of n- and p-type Skutterudi...  

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

Mechanical and Elastic Property Evaluation of n- and p-type Skutterudites Mechanical and Elastic Property Evaluation of n- and p-type Skutterudites This talk discusses the...

40

E-Print Network 3.0 - anisotropic mechanical properties Sample...  

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

mechanical properties Search Powered by Explorit Topic List Advanced Search Sample search results for: anisotropic mechanical properties Page: << < 1 2 3 4 5 > >> 1 JOURNAL DE...

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Characterization of High Temperature Mechanical Properties Using Laser Ultrasound  

SciTech Connect (OSTI)

Mechanical properties are controlled to a large degree by defect structures such as dislocations and grain boundaries. These microstructural features involve a perturbation of the perfect crystal lattice (i.e. strain fields). Viewed in this context, high frequency strain waves (i.e. ultrasound) provide a natural choice to study microstructure mediated mechanical properties. In this presentation we use laser ultrasound to probe mechanical properties of materials. This approach utilizes lasers to excite and detect ultrasonic waves, and as a consequence has unique advantages over other methodsit is noncontacting, requires no couplant or invasive sample preparation (other than that used in metallurgical analysis), and has the demonstrated capability to probe microstructure on a micron scale. Laser techniques are highly reproducible enabling sophisticated, microstructurally informed data analysis. Since light is being used for generation and detection of the ultrasonic wave, the specimen being examined is not mechanically coupled to the transducer. As a result, laser ultrasound can be carried out remotely, an especially attractive characteristic for in situ measurements in severe environments. Several examples involving laser ultrasound to measure mechanical properties in high temperature environments will be presented. Emphasis will be place on understanding the role of grain microstructure.

David Hurley; Stephen Reese; Farhad Farzbod; Rory Kennedy

2012-05-01T23:59:59.000Z

42

Mechanical properties and microstructures of dual phase steels containing silicon, aluminum and molybdenum  

E-Print Network [OSTI]

K. (1977). G. E. Dieter, Mechanical Metallurgy, McGraw-Hill,LBL-9047 MECHANICAL PROPERTIES AND MICROSTRUCTURES OF DUALB. Heat Treatment C. Mechanical Testing D. Microscopy

Neill, Thomas John O'

2011-01-01T23:59:59.000Z

43

NH4-smectite: Characterization, hydration properties and hydro mechanical behaviour  

E-Print Network [OSTI]

NH4-smectite: Characterization, hydration properties and hydro mechanical behaviour M. Gautier a and drive to environmental problems. The purpose of this study was to understand the hydro- physical changes the pressure on small amounts of samples, proved the strong increase of the permeability of NH4-smectite

Paris-Sud XI, Université de

44

The influence of microstructure on the mechanical properties of solder  

SciTech Connect (OSTI)

Solder joints in microelectronics devices consist of low-melting solder compositions that wet and join metal contacts and are, ordinarily, used at high homologous temperatures in the as-solidified condition. Differences in solidification rate and substrate interactions have the consequence that even solder joints of similar compositions exhibit a wide range of microstructures. The variation in microstructure causes a variation in properties; in particular, the high-temperature creep properties that govern much of the mechanical behavior of the solder may differ significantly from joint to joint. The present paper reviews the varieties of microstructure that are found in common solder joints, and describes some of the ways in which microstructural changes affect mechanical properties and joint reliability.

Morris, J.W. Jr.; Reynolds, H.L.

1996-06-01T23:59:59.000Z

45

Mechanical Properties of Materials with Nanometer Scale Microstructures  

SciTech Connect (OSTI)

We have been engaged in research on the mechanical properties of materials with nanometer-scale microstructural dimensions. Our attention has been focused on studying the mechanical properties of thin films and interfaces and very small volumes of material. Because the dimensions of thin film samples are small (typically 1 mm in thickness, or less), specialized mechanical testing techniques based on nanoindentation, microbeam bending and dynamic vibration of micromachined structures have been developed and used. Here we report briefly on some of the results we have obtained over the past three years. We also give a summary of all of the dissertations, talks and publications completed on this grant during the past 15 years.

William D. Nix

2004-10-31T23:59:59.000Z

46

Investigation of moisture effects on interfacial properties of an epoxy matrix composite by dynamic mechanical analysis  

E-Print Network [OSTI]

properties of glass bead-epoxy composites by measuring mechanical properties obtained through dynamic mechanical testing. The viscoelastic material properties of glass bead-composites, including glassy and rubbery moduli and the loss tangent (tanb) were...

Wang, Jo-Yu

1994-01-01T23:59:59.000Z

47

Two Department Employees Recognized for Outstanding Public Service |  

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

Two Department Employees Recognized for Outstanding Public Service Two Department Employees Recognized for Outstanding Public Service Two Department Employees Recognized for Outstanding Public Service May 8, 2013 - 5:01pm Addthis Two Department Employees Recognized for Outstanding Public Service Steven R. Thai Steven R. Thai Office of Public Affairs What are the key facts? Paul Jablonski and Josh Silverman, two Energy Department employees, are finalists for this year's eight Samuel J. Heyman Service to America Medals -- an award that pays tribute to the dedicated federal workforce, highlighting those who have made significant contributions to our country. The Department of Energy is pleased to announce that two federal employees have been recognized by the Partnership for Public Service. Paul Jablonski and Josh Silverman are two of the 31 finalists for this year's eight

48

President Obama honors outstanding early-career scientists | National  

National Nuclear Security Administration (NNSA)

honors outstanding early-career scientists | National honors outstanding early-career scientists | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > NNSA Blog > President Obama honors outstanding early-career scientists President Obama honors outstanding early-career scientists Posted By Office of Public Affairs Five individuals from NNSA's national laboratories have been named

49

Christine Anderson-Cook: An outstanding New Mexico woman  

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

Christine Anderson-Cook: An outstanding New Mexico woman Christine Anderson-Cook: An outstanding New Mexico woman Christine Anderson-Cook: an outstanding New Mexico woman Cook recognized for her technical leadership in statistics, extensive professional service at the national level, and mentorship of nearly 70 students. April 14, 2011 Christine Anderson-Cook Christine Anderson-Cook Contact Fred deSousa Communicatons Office (505) 665-3430 Email LOS ALAMOS, New Mexico, April 14, 2011-The New Mexico Commission on the Status of Women selected Los Alamos National Laboratory research statistician Christine Anderson-Cook as one of 20 women to receive the 26th Annual Governor's Award for Outstanding New Mexico Women. An awards banquet is scheduled for May 6 at the Hotel Albuquerque in Albuquerque. "We are extremely proud of Christine's accomplishments, both as an

50

Mechanical and metallurgical properties of MMC friction welds  

SciTech Connect (OSTI)

The mechanical and metallurgical properties of similar and dissimilar welds involving aluminum-based metal matrix composite (MMC) base material were investigated using factorial experimentation. The test materials comprised aluminum-based alloy 6061/Al{sub 2}O{sub 3} (W6A.10A-T6), aluminum Alloy 6061-T6 and AISI 304 stainless steel. Notch tensile strength increased when high friction pressures were employed during MMC/MMC, MMC/Alloy 6061, MMC/AISI 304 stainless steel and Alloy 6061/Alloy 6061 friction welding. In MMC/Alloy 6061 welds, notch tensile strength also increased when high forging pressures were employed. Applied oxide films on both the MMC and AISI stainless steel substrates had a markedly detrimental effect on dissimilar weld mechanical properties. The optimum notch tensile strength properties were produced when high friction pressure values were applied during dissimilar MMC/AISI 304 stainless steel welding. High friction pressure had two beneficial effects, i.e., it decreased the thickness of the FeAl{sub 3} intermetallic film and it promoted disruption and dispersal of oxide films at the joint interface. In direct contrast, the presence of thick anodized oxide films on the MMC substrate surface prior to friction welding had no observable influence on MMC/MMC weld mechanical properties.

Li, Z.; Maldonado, C.; North, T.H. [Univ. of Toronto, Ontario (Canada). Dept. of Metallurgy and Materials Science; Altshuller, B. [Alcan R and D Labs., Kingston, Ontario (Canada)

1997-09-01T23:59:59.000Z

51

Mechanical properties of irradiated single-layer graphene  

SciTech Connect (OSTI)

The mechanical properties of irradiated single-layer graphene sheets are determined as a function of inserted vacancy concentration. We find that the vacancy-induced crystalline-to-amorphous transition is accompanied by a brittle-to-ductile transition in the failure response of irradiated graphene sheets for inserted vacancy concentrations of 8%-12%. While point defects and larger voids appreciably degrade the strength of pristine graphene, we find that even heavily damaged samples ({approx}20% vacancies) exhibit tensile strengths of {approx}30 GPa, in significant excess of those typical of engineering materials. Our results suggest that defect engineering of graphene is feasible without incurring a complete loss of its desirable mechanical properties.

Carpenter, Corinne; Maroudas, Dimitrios [Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003 (United States); Ramasubramaniam, Ashwin [Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003 (United States)

2013-07-01T23:59:59.000Z

52

E-Print Network 3.0 - achieve outstanding success Sample Search...  

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

outstanding graduating senior for outstanding service and achievement... achievement and service to ASME. Awarded to an ... Source: Suzuki, Masatsugu - Department of Physics,...

53

Mechanical properties and modeling of seal-forming lithologies  

SciTech Connect (OSTI)

Both rocksalt and shale lithologies are actively deformed in response to gravitational loads associated with deposition, and both form effective seals to petroleum and natural gas. Thus, the shapes of seal-forming units, and the nature of fractures and faults that may breach them depend upon either the mechanical properties of salt or those of shale, and the loading histories to which they have been subjected. The objectives of this research include the determination of the mechanical properties under controlled conditions of well-characterized shales, and the numerical modeling of rocksalt (and eventually shale) formations using laboratory-based rheologies. Progress has been made towards these goals over this project period, both in our experimental program on shale deformation and model development for the growth of salt diapirs. The mechanical anisotropy of an illite-bearing shale from Louisiana has been determined and related to the preferred orientation and distribution of clays. Its strength in the absence of pore fluids has been determined at confining pressures of up to 250 MPa and at high pressure we have investigated the effects of deformation rate and temperature. A numerical finite difference code has been developed to solve the incompressible Navier-Stokes equations and validated using a two- layer linear viscous model for which analytic solutions are available. Although the code has only been validated for the linear viscous case, it is capable of solving for highly nonlinear constitutive laws as well as solving for arbitrary interfaces between the salt and overburden.

Kronenberg, A.K.; Russell, J.E.; Carter, N.L.; Ibanez, W.; Mazariegos, R.

1992-04-01T23:59:59.000Z

54

Energy Department Lab Researcher Wins HENAAC Award for Outstanding  

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

Lab Researcher Wins HENAAC Award for Outstanding Lab Researcher Wins HENAAC Award for Outstanding Achievement Energy Department Lab Researcher Wins HENAAC Award for Outstanding Achievement August 15, 2012 - 2:54pm Addthis AlexÂ-andra “Ale” Hakala is an award-winning geoscientist at DOE’s National Energy Technology Laboratory. | Photo from the National Energy Technology Laboratory. Alex-andra "Ale" Hakala is an award-winning geoscientist at DOE's National Energy Technology Laboratory. | Photo from the National Energy Technology Laboratory. Amanda Scott Amanda Scott Former Managing Editor, Energy.gov Fun Facts About Dr. Hakala Her experiences dancing with her family at special events and the 2 years she spent living in Chile are among her most treasured memories. While living in Chile, Dr. Hakala developed a passion for both

55

Outstanding Issues For New Geothermal Resource Assessments | Open Energy  

Open Energy Info (EERE)

Outstanding Issues For New Geothermal Resource Assessments Outstanding Issues For New Geothermal Resource Assessments Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Outstanding Issues For New Geothermal Resource Assessments Details Activities (1) Areas (1) Regions (0) Abstract: A critical question for the future energy policy of the United States is the extent to which geothermal resources can contribute to an ever-increasing demand for electricity. Electric power production from geothermal sources exceeds that from wind and solar combined, yet the installed capacity falls far short of the geothermal resource base characterized in past assessments, even though the estimated size of the resource in six assessments completed in the past 35 years varies by thousands of Megawatts-electrical (MWe). The U. S. Geological Survey (USGS)

56

Category:Articles with outstanding TODO tasks | Open Energy Information  

Open Energy Info (EERE)

Articles with outstanding TODO tasks Articles with outstanding TODO tasks Jump to: navigation, search This category contains articles which have been flagged as requiring specific work. For higher-level TODO tasks which are not tied to specific articles, see OpenEI:TODO. Pages in category "Articles with outstanding TODO tasks" The following 177 pages are in this category, out of 177 total. 1 1st Light Energy, Inc. A A2BE Carbon Capture LLC Abbotsford, Australia Agricultural Equipment Ambient Control Systems American Solar Technology Amur Energy Division Anaerobic Digestion Anant Oorja Argonne, Illinois Askja Energy Austin Clean Energy Group B Bank of Italy Biodiesel Black Warrior, Nevada Boilers Boots on the Roof Bordeaux International Energy Consulting, LLC BP Statistical Review of World Energy

57

WIPP Security Force Recognized for Outstanding Safety | Department of  

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

Security Force Recognized for Outstanding Safety Security Force Recognized for Outstanding Safety WIPP Security Force Recognized for Outstanding Safety May 9, 2013 - 12:00pm Addthis U.S. Department of Energy Carlsbad Field Office Manager Joe Franco (right) presents the Star of Excellence Award to Security Walls, LLC Manager Richard De Los Santos. U.S. Department of Energy Carlsbad Field Office Manager Joe Franco (right) presents the Star of Excellence Award to Security Walls, LLC Manager Richard De Los Santos. Media Contact Deb Gill, (575) 234-7270 U.S. DOE Carlsbad Field Office CARLSBAD, N.M., May 9, 2013 - The U.S. Department of Energy (DOE) has awarded Security Walls, LLC, the Waste Isolation Pilot Plant's (WIPP) Security Protective Force, with a Star of Excellence Award in the Voluntary Protection Program (VPP) for the fifth consecutive year.

58

DOE Science Showcase - "PECASE: Outstanding early career research  

Office of Scientific and Technical Information (OSTI)

"PECASE: Outstanding early career research "PECASE: Outstanding early career research honored" Energy Department Scientists & Engineers Honored with Presidential Early Career Awards PECASE award ceremony DOE recently recognized the following scientists and engineers at the outset of their independent research careers: Dillon Fong and Elena V. Shevchenko of Argonne National Laboratory Find Dillon Fong's research in the Energy Citations Database Find Elena Shevchenko's research with the Energy Citations Database Gavin E. Crooks and Trent R. Northen of Lawrence Berkeley National Laboratory Find Gavin Crooks research with the Science Accelerator Find Trent Northen's research with the Science Accelerator Jacob M. Hookerof Brookhaven National Laboratory Find Jacob Hooker's research in the Energy Citations Database

59

Nano measurements with micro-devices: mechanical properties of hydrated collagen fibrils  

Science Journals Connector (OSTI)

2005 The Royal Society 22 February 2006 Nano measurements with micro-devices: mechanical properties of hydrated...287, 637-640. doi:10.1126/science.287.5453.637 . Nano measurements with micro-devices: mechanical properties of hydrated...

2006-01-01T23:59:59.000Z

60

COLLEGE OF AGRICULTURE AND LIFE SCIENCES OUTSTANDING ALUMNI AWARD  

E-Print Network [OSTI]

COLLEGE OF AGRICULTURE AND LIFE SCIENCES OUTSTANDING ALUMNI AWARD Texas A&M University The College of Agriculture and Life Sciences at Texas A&M University is currently in its second century of educating leaders and providing leadership for the agricultural industry -- a tradition of leadership. Through its strong teaching

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

2013 Institute for Sustainable Energy Outstanding Energy Paper Awards  

E-Print Network [OSTI]

2013 Institute for Sustainable Energy Outstanding Energy Paper Awards Jason M. Luk, Mohammad Pourbafrani, Bradley A. Saville and Heather L. MacLean Ethanol or Bioelectricity? Life Cycle Assessment://dx.doi.org/10.1021/es4006459 In the transportation sector over 97% of energy use can be attributed to petroleum

62

Mechanical Properties of K Basin Sludge Constituents and Their Surrogates  

SciTech Connect (OSTI)

A survey of the technical literature was performed to summarize the mechanical properties of inorganic components in K Basins sludge. The components included gibbsite, ferrihydrite, lepidocrocite and goethite, hematite, quartz, anorthite, calcite, basalt, Zircaloy, aluminum, and, in particular, irradiated uranium metal and uranium dioxide. Review of the technical literature showed that information on the hardness of uranium metal at irradiation exposures similar to those experienced by the N Reactor fuel present in the K Basins (typically up to 3000 MWd/t) were not available. Measurements therefore were performed to determine the hardness of coupons taken from three irradiated N Reactor uranium metal fuel elements taken from K Basins. Hardness values averaged 30 {+-} 8 Rockwell C units, similar to values previously reported for uranium irradiated to {approx}1200 MWd/t. The physical properties of candidate uranium metal and uranium dioxide surrogates were gathered and compared. Surrogates having properties closest to those of irradiated uranium metal appear to be alloys of tungsten. The surrogate for uranium dioxide, present both as particles and agglomerates in actual K Basin sludge, likely requires two materials. Cerium oxide, CeO2, was identified as a surrogate of the smaller UO2 particles while steel grit was identified for the UO2 agglomerates.

Delegard, Calvin H.; Schmidt, Andrew J.; Chenault, Jeffrey W.

2004-12-06T23:59:59.000Z

63

Mechanical properties and modeling of seal-forming lithologies  

SciTech Connect (OSTI)

Specific goals and accomplishments of this research include: (1) The evaluation of models of salt diaper ascent that involve either power law, dislocation creep as determined experimentally by Horseman et al. (1993) or linear, fluid-assisted creep as reported by Spiers et al. (1988, 1990, 1992). We have compared models assuming these two, experimentally evaluated flow laws and examined the predictions they make regarding diaper incubation periods, ascent velocities, deviatoric stresses and strain rates. (2) The evaluation of the effects of differential loading on the initiation an of salt structures. (3) Examination of the role of basement faults on the initiation and morphologic evolution of salt structures. (4) Evaluation of the mechanical properties of shale as a function of pressure and determination of the nature of its brittle-ductile transition. (5) Evaluation of the mechanical anisotropies of shales with varying concentrations, distributions and preferred orientations of clay. (6) The determination of temperature and ratedependencies of strength for a shale constitutive model that can be used in numerical models that depend on viscous formulations. (7) Determination of the mechanisms of deformation for argillaceous rocks over awide range of conditions. (8) Evaluation of the effects of H[sub 2]O within clay interlayers, as adsorbed surface layers.

Kronenberg, A.K.; Russell, J.E.; Carter, N.L.; Mazariegos, R.; Ibanez, W.

1993-01-01T23:59:59.000Z

64

Overview of US LMFBR Structural Materials Mechanical Properties Program  

SciTech Connect (OSTI)

This paper presents the objective, scope, and status of the US Department of Energy's Materials and Structures Program to develop a data base on mechanical properties of structural materials for out-of-core structures and components for LMFBRs. Information on the development of a reference data base on materials for the reactor system, reactor enclosure system, primary heat transport system, intermediate heat transport system, and steam generator system is included. In addition, the development of the data and analyses to account for the effects of temperature and stress, as well as water/steam, sodium, and radiation environments, is described. Plans for the development of alternative materials for future out-of-core applications are presented.

Horak, J.A.; Purdy, C.M.

1983-01-01T23:59:59.000Z

65

Additive manufacturing mechanical property assessment and part candidate screening  

Science Journals Connector (OSTI)

The field of rapid prototyping has demonstrated elements of production to become rapid manufacturing (RM). Key elements of this transition involve a distinct requirement for a consistent mechanical property evaluation technique to be used as a baseline for direct part fabrication. This research portrays proven techniques developed by industry to evaluate additive manufacturing (AM) for a variety of applications. Data are generated using the techniques provided and are applied to the generation of statistical analysis assessments. These data are compiled and used by design engineers to assess the technical feasibility of RM for integrated designs. Fused deposition modelling is gaining ground for AM applications. The research provided offers a path for technical specification development using case examples.

David M. Dietrich; Michael W. Hayes; Frank Liou

2011-01-01T23:59:59.000Z

66

Pore Structure and Mechanical Properties of Poly(methylsilsesquioxane) Aerogels  

Science Journals Connector (OSTI)

Organic-inorganic hybrid aerogels have been prepared by an acid/base two-step sol-gel reaction utilizing urea and surfactant. Polycondensation of methyltrimethoxysilane (MTMS) is promoted by the hydrolysis of urea, and the hydrophobicity of condensates is weakened by adequate cationic or nonionic surfactant. Aerogels with low bulk density (~ 0.13 g cm?3) and high visible light transmittance (~ 89 % at 550 nm through 10 mm-thick sample) are obtained. The resultant hybrid aerogels show high deformability and subsequent spring-back upon uniaxial compression owing to the lower cross-linking density and residual silanol density compared to silica, and to the presence of hydrophobic methyl groups in the network. Additional aging of as-prepared wet gels in water improved mechanical properties in the case of cationic surfactant system.

K Kanamori; G Hayase; K Nakanishi; T Hanada

2011-01-01T23:59:59.000Z

67

TRITIUM EFFECTS ON DYNAMIC MECHANICAL PROPERTIES OF POLYMERIC MATERIALS  

SciTech Connect (OSTI)

Dynamic mechanical analysis has been used to characterize the effects of tritium gas (initially 1 atm. pressure, ambient temperature) exposure over times up to 2.3 years on several thermoplastics-ultrahigh molecular weight polyethylene (UHMW-PE), polytetrafluoroethylene (PTFE), and Vespel{reg_sign} polyimide, and on several formulations of elastomers based on ethylene propylene diene monomer (EPDM). Tritium exposure stiffened the elastic modulus of UHMW-PE up to about 1 year and then softened it, and reduced the viscous response monotonically with time. PTFE initially stiffened, however the samples became too weak to handle after nine months exposure. The dynamic properties of Vespel{reg_sign} were not affected. The glass transition temperature of the EPDM formulations increased approximately 4 C. following three months tritium exposure.

Clark, E

2008-11-12T23:59:59.000Z

68

President Obama Named 13 Energy Department Scientists for Outstanding Early  

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

Named 13 Energy Department Scientists for Named 13 Energy Department Scientists for Outstanding Early Career Award President Obama Named 13 Energy Department Scientists for Outstanding Early Career Award July 26, 2012 - 11:12am Addthis President Obama today named 96 researchers as recipients of the Presidential Early Career Awards for Scientists and Engineers, the highest honor bestowed by the United States Government on science and engineering professionals in the early stages of their independent research careers. These include 13 receipients from the Energy Department. "Discoveries in science and technology not only strengthen our economy, they inspire us as a people." President Obama said. "The impressive accomplishments of today's awardees so early in their careers promise even greater advances in the years ahead."

69

Copyright (to be inserted by Humphrey) Thermal and Dynamic-mechanical Properties of Wood-PVC  

E-Print Network [OSTI]

Citation & Copyright (to be inserted by Humphrey) Thermal and Dynamic-mechanical Properties of Wood properties, maleation, thermal analysis, wood veneer, wood-PVC composites ABSTRACT The influence of maleation on thermal and dynamic-mechanical properties of wood-PVC composites was investigated in this study

70

Thermal and mechanical properties of hemp fabric-reinforced nanoclaycement nanocomposites  

Science Journals Connector (OSTI)

The influence of nanoclay on thermal and mechanical properties of hemp ... these properties are improved as a result of nanoclay addition. An optimum replacement of ordinary Portland cement with 1wt% nanoclay is...

A. Hakamy; F. U. A. Shaikh; I. M. Low

2014-02-01T23:59:59.000Z

71

Multiscale micromechanical modeling of the thermal/mechanical properties of polymer/clay nanocomposites  

E-Print Network [OSTI]

Polymer/clay nanocomposites have been observed to exhibit enhanced thermal/mechanical properties at low weight fractions (We) of clay. Continuum-based composite modeling reveals that the enhanced properties are strongly ...

Sheng, Nuo, 1977-

2006-01-01T23:59:59.000Z

72

Mechanical properties and electronic structure of zircon: Ab inito FLAPW-GGA calculations  

Science Journals Connector (OSTI)

Calculations of the mechanical properties and electronic structure of zircon ZrSiO4 using the first-principle FLAPW-GGA method are performed. It is established that a parameter limiting the mechanical stability o...

V. V. Bannikov; I. R. Shein; A. L. Ivanovskii

2012-01-01T23:59:59.000Z

73

Properties and mechanism on flexural fatigue of polypropylene fiber reinforced concrete containing slag  

Science Journals Connector (OSTI)

Properties and mechanism were investigated on flexural fatigue of concrete containing polypropylene fibers and ground granulated blast furnace slag(GGBFS). Four polypropylene fibers volume fractions and five ...

Huili Zhang ???; Kanliang Tian

2011-06-01T23:59:59.000Z

74

E-Print Network 3.0 - axial mechanical properties Sample Search...  

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

in order to derive its structural rigidity for axial tension... response Reticulated tubes: effective elastic properties ... Source: Fleck, Norman A. - Mechanics, Materials and...

75

Deformable geometry design with controlled mechanical property based on 3D printing.  

E-Print Network [OSTI]

??Deformable products exist broadly in different industries. These deformable products undergo deformation to achieve specific mechanical properties. Custom made insoles are applied to redistribute plantar (more)

Li, Yongqiang

2014-01-01T23:59:59.000Z

76

Mechanical properties of random arrays of short carbon fibers (*) J. Vareille (**), E. Guyon and S. Roux  

E-Print Network [OSTI]

1361 Mechanical properties of random arrays of short carbon fibers (*) J. Vareille (**), E. Guyon. Abstract. 2014 The mechanical properties of random short carbon fiber composites have been studied de carbone à fibres courtes ont été étudiées. expérimentalement en relation avec leurs propriétés

Paris-Sud XI, Université de

77

Nano-structured vanadium: processing and mechanical properties under quasi-static and dynamic compression  

E-Print Network [OSTI]

Nano-structured vanadium: processing and mechanical properties under quasi-static and dynamic form 16 September 2003; accepted 9 October 2003 Abstract We have processed fully dense, nano that the grain size of the consolidated V is around 100 nm. Mechanical properties of the nano-structured V were

Wei, Qiuming

78

International Journal of Crashworthiness, 2012, 17(3): p. 327-336 Mechanical Properties and Failure Mechanisms of Closed-Cell PVC Foams  

E-Print Network [OSTI]

guidelines. Keywords: Foam; cellular polymer; mechanical properties; impact; automotive material. 1 into increased fuel economy and reduced pollution in transportation applications. In addition, high compressive with uniform cell structure and improved mechanical properties can be chemically synthesized through

Gupta, Nikhil

79

PHYSICAL AND MECHANICAL PROPERTIES OF SOME ALUMINUM-LITHIUM ALLOYS...  

Office of Scientific and Technical Information (OSTI)

3: Argonne National Lab., Ill. A literature survey of room-temperature properties of Al-- Li alloys was made. The eutectic composition was determined by thermal analysis and...

80

Measuring physical and mechanical properties of individual carbon nanotubes by in situ TEM  

E-Print Network [OSTI]

, was observed only from defect-free carbon nanotubes grown by arc-discharge technique, while such an effect transmission electron microscopy to measure the electric, mechanical and field emission properties, the physical properties of nanomaterials could be quite diverse. The electric properties of carbon nanotubes

Wang, Zhong L.

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

The effect of molecular architecture on the mechanical properties of epoxy resin systems  

E-Print Network [OSTI]

THE EFFECT OF MOLECULAR ARCHITECTURE ON THE MECHANICAL PROPERTIES OF EPOXY RESIN SYSTEMS A Thesis by GALE ANTRUS HOLMES 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 May 1992 Major Subject: Mechanical Engineering THE EFFECT OF MOLECULAR ARCHITECTURE ON THE MECHANICAL PROPERTIES OF EPOXY RESIN SYSTEMS A Thesis bY GALE ANTRUS HOLMES Approved as to style an content by: Alan Let. ton...

Holmes, Gale Antrus

1992-01-01T23:59:59.000Z

82

Electronic, thermal and mechanical properties of carbon nanotubes  

Science Journals Connector (OSTI)

...This has led to the prediction that these defective nanotubes behave as the desired nanoscale...Haeckel (1862). These `ide- ally' defective tubes exhibit intriguing electronic properties...dt car- boncarbon energy overlap integral of...

2004-01-01T23:59:59.000Z

83

Optical characterization of complex mechanical and thermal transport properties  

E-Print Network [OSTI]

Time-resolved impulsive stimulated light scattering (ISS), also known as transient grating spectroscopy, was used to investigate phonon mediated thermal transport in semiconductors and mechanical degrees of freedom linked ...

Johnson, Jeremy A. (Jeremy Andrew)

2011-01-01T23:59:59.000Z

84

Microstructural and Mechanical Property Changes in Ion Irradiated Tunsgten  

E-Print Network [OSTI]

on the sustainability of tungsten as a plasma facing material (PFM). During operation, PFM must withstand harsh conditions with combined effects from high temperature, mechanical stress, irradiation, transmutation, and the production of hydrogen (H) and helium (He...

General, Michael

2013-04-08T23:59:59.000Z

85

Optical method for determining the mechanical properties of a material  

DOE Patents [OSTI]

Disclosed is a method for characterizing a sample, comprising the steps of: (a) acquiring data from the sample using at least one probe beam wavelength to measure, for times less than a few nanoseconds, a change in the reflectivity of the sample induced by a pump beam; (b) analyzing the data to determine at least one material property by comparing a background signal component of the data with data obtained for a similar delay time range from one or more samples prepared under conditions known to give rise to certain physical and chemical material properties; and (c) analyzing a component of the measured time dependent reflectivity caused by ultrasonic waves generated by the pump beam using the at least one determined material property. The first step of analyzing may include a step of interpolating between reference samples to obtain an intermediate set of material properties. The material properties may include sound velocity, density, and optical constants. In one embodiment, only a correlation is made with the background signal, and at least one of the structural phase, grain orientation, and stoichiometry is determined.

Maris, Humphrey J. (Barrington, RI); Stoner, Robert J. (Duxbury, MA)

1998-01-01T23:59:59.000Z

86

Optical method for determining the mechanical properties of a material  

DOE Patents [OSTI]

Disclosed is a method for characterizing a sample, comprising the steps of: (a) acquiring data from the sample using at least one probe beam wavelength to measure, for times less than a few nanoseconds, a change in the reflectivity of the sample induced by a pump beam; (b) analyzing the data to determine at least one material property by comparing a background signal component of the data with data obtained for a similar delay time range from one or more samples prepared under conditions known to give rise to certain physical and chemical material properties; and (c) analyzing a component of the measured time dependent reflectivity caused by ultrasonic waves generated by the pump beam using the at least one determined material property. The first step of analyzing may include a step of interpolating between reference samples to obtain an intermediate set of material properties. The material properties may include sound velocity, density, and optical constants. In one embodiment, only a correlation is made with the background signal, and at least one of the structural phase, grain orientation, and stoichiometry is determined. 14 figs.

Maris, H.J.; Stoner, R.J.

1998-12-01T23:59:59.000Z

87

Mechanical properties of Mesaverde sandstone and shale at high pressures. [Colorado and Wyoming  

SciTech Connect (OSTI)

This report covers the mechanical properties of Mesaverde rock (shale and sandstone) core samples from various depths in five wells in Colorado and Wyoming. The properties studied were tensile strength, compressive strength, hydrostatic compressibility, shear stress under one-dimensional strain compression, and static elastic moduli. With respect to these properties, the sandstones are virtually isotropic. The shales, on the other hand, are definitely anisotropic. The nature and degree of anisotropy of the shales vary with the depth of sample origin. In addition, the relative values of these mechanical properties between the shale and the sandstone also vary with depth.

Lin, W.

1983-04-01T23:59:59.000Z

88

EARLY-AGE CRACKING REVIEW: MECHANISMS, MATERIAL PROPERTIES,  

E-Print Network [OSTI]

://cementbarriers.org/ and Savannah River National Laboratory website: http://srnl.doe.gov #12;Early-Age Cracking Review: Mechanisms Commission (NRC), the National Institute of Standards and Technology (NIST), the Savannah River National of work performed in part under that contract. This report was prepared in support of the Savannah River

Bentz, Dale P.

89

The effect of porosity on the mechanical properties of cordierite diesel particulate filter substrates  

SciTech Connect (OSTI)

Diesel particulate filter (DPF) technology depends on porous ceramic structures that trap the particulate matter in the diesel engine exhaust gas stream. The design of DPFs requires balancing the functional requirement of soot filtration with the mechanical properties and both are influenced by the porosity of the substrate. In addition, increasing the porosity of the substrate can assist with the catalytic washcoating, engine back pressure and engine efficiency. The effect of porosity on the elastic and fracture mechanical properties of cordierite based ceramic particulate filters was examined and will be described. Elastic modulus of DPF substrates was determined using resonant ultrasound spectroscopy while fracture toughness was characterized using the double-torsion test method. The interrelationships among specimen thickness, wall orientation, porosity and mechanical properties of the filter substrates will be discussed. A materials selection procedure to obtain filters with high thermal shock resistance and optimal mechanical properties will be described.

Shyam, Amit [ORNL; Lara-Curzio, Edgar [ORNL; Watkins, Thomas R [ORNL

2009-01-01T23:59:59.000Z

90

Graphene for reducing bubble defects and enhancing mechanical properties of graphene/cellulose acetate composite films  

Science Journals Connector (OSTI)

In this study, we have demonstrated a strategy by which graphene was used to reduce the bubble defects and enhance the mechanical properties in graphene/cellulose acetate (Gr/CA) composite films. Mono- and multil...

Lei Liu; Zhigang Shen; Shuaishuai Liang; Min Yi

2014-01-01T23:59:59.000Z

91

Effects of mechanical properties and surface friction on elasto-plastic sliding contact  

E-Print Network [OSTI]

Effects of mechanical properties and surface friction on elasto-plastic sliding contact S and many recent computational studies have established quantitative relationships between elasto-plastic systematically quantified the effect of the plastic deformation characteristics on the frictional sliding

Suresh, Subra

92

IAWA Journal (2003) 24(3) 223-230 IMAGING THE MECHANICAL PROPERTIES OF WOOD CELL  

E-Print Network [OSTI]

to be correctly introduced. In particular the orientation of the cellulose microfibrilles in the lignin and xylan and the sample. It permits to map the elastic properties of surface, thanks to a model based on the mechanics

Paris-Sud XI, Université de

93

Hydrogen storage properties of Mg-based mixtures elaborated by reactive mechanical grinding  

Science Journals Connector (OSTI)

The hydrogen sorption properties of Mg + 10 wt% WO3 and Mg + 5 wt% Cr2O3 mixtures made by reactive (under hydrogen) mechanical grinding were studied and compared with those of elemental Mg subjected to a similar ...

J.-L. Bobet; B. Chevalier

2004-08-01T23:59:59.000Z

94

An instrument for high-throughput measurements of fiber mechanical properties  

E-Print Network [OSTI]

In this thesis, an instrument is designed and constructed for the purpose of measuring the mechanical properties of single fibers. The instrument is intended to provide high throughput measurement of single fiber geometric ...

Kristofek, Grant William, 1980-

2005-01-01T23:59:59.000Z

95

Polymer, Vol. 46, no. 2, pp. 553-562 (2005) Modeling of the Mechanical Properties of Nanoparticle/Polymer Composites  

E-Print Network [OSTI]

and particles in the polymer. Several efforts have focused on the modeling of mechanical properties of nanoclay

Odegard, Gregory M.

96

Corrosion and Mechanical Properties of Materials in Combustion and Mixed-Gas Environments  

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

Corrosion and Mechanical Properties of Corrosion and Mechanical Properties of Materials in Combustion and Mixed-Gas Environments Background A number of advanced technologies are being developed to convert coal to clean fuels for power generation and for use as a feedstock in chemical plants. Coal con- version and combustion processes create by-products that affect the performance of the materials of which the plant components are fabricated, reducing the systems'

97

Method of determining elastic and plastic mechanical properties of ceramic materials using spherical indenters  

DOE Patents [OSTI]

The invention pertains a method of determining elastic and plastic mechanical properties of ceramics, intermetallics, metals, plastics and other hard, brittle materials which fracture prior to plastically deforming when loads are applied. Elastic and plastic mechanical properties of ceramic materials are determined using spherical indenters. The method is most useful for measuring and calculating the plastic and elastic deformation of hard, brittle materials with low values of elastic modulus to hardness.

Adler, Thomas A. (Corvallis, OR)

1996-01-01T23:59:59.000Z

98

A Comparison of Mechanical Properties of Three MEMS Materials -Silicon Carbide, Ultrananocrystalline Diamond, and Hydrogen-Free Tetrahedral  

E-Print Network [OSTI]

A Comparison of Mechanical Properties of Three MEMS Materials - Silicon Carbide investigated the mechanical properties of three new materials for MEMS/NEMS devices: silicon carbide (SiC) from mechanical, electrical, and tribological properties such as silicon carbide (SiC), ultrananocrystalline

Espinosa, Horacio D.

99

Effects of Thermal Aging on the Mechanical Properties of a Porous-Matrix Ceramic Composite  

E-Print Network [OSTI]

Effects of Thermal Aging on the Mechanical Properties of a Porous-Matrix Ceramic Composite Eric A properties of an all-oxide fiber-reinforced composite following long-term exposure (1000 h) at temperatures of 1000­1200°C in air. The composite of interest derives its damage tolerance from a highly porous matrix

Zok, Frank

100

Mechanical properties of crimped mineral wools: Identification from digital image correlation  

E-Print Network [OSTI]

of the material, favorable for a low thermal conductivity, yields low mechanical strength. This observation textured product used for its thermal and acoustic properties. Some applications however require mechanical materials still display a local anisotropic structure, but due to crimping, the preferential orientation

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Tensile properties and deformation mechanisms in two-phase titanium aluminide sheet material  

SciTech Connect (OSTI)

The mechanical properties of two-phase TiAl sheets with different compositions and microstructures were investigated over the temperature range 25--1,000 C. The microprocesses of plasticity were characterized by electron microscope observations. Particular emphasis has been paid to the mechanisms governing the deformation behavior at elevated temperatures which are relevant for the fabrication and engineering applications of structural components.

Appel, F.; Wagner, R. [GKSS Research Center, Geesthacht (Germany). Inst. for Materials Research; Clemens, H.; Glatz, W. [Plansee AG, Reutte (Austria)

1997-12-31T23:59:59.000Z

102

Nano-mechanical properties of individual mineralized collagen fibrils from bone tissue  

Science Journals Connector (OSTI)

...research-article Research articles 1004 25 27 131 Nano-mechanical properties of individual mineralized...phenomenological model is used to describe the fibril nano-mechanical behaviour. biomechanics...materials. Bone is structurally a composite as nano-fibres of CFs act as a template for the...

2011-01-01T23:59:59.000Z

103

Evaluation of Mechanical Properties of Nuclear Materials Using Non-Destructive Ball Indentation Technique  

SciTech Connect (OSTI)

Integrity of structural components depends on the deformation and fracture behavior of materials. For evaluating the material condition in-service, it is generally not feasible or practical or advisable to cut samples from operating structures. Non-destructive testing (NDT) techniques are required to evaluate the mechanical properties. Although several NDT techniques such as ultrasound, magnetic strength, Barkhausen noise, microhardness etc., are employed for estimating the mechanical property degradation, these methodologies are generally empirical and indirect. Automated Ball Indentation (ABI) is a non-destructive testing technique for direct measurement of mechanical and fracture properties of metallic engineering materials. Because of the small area over which the test is carried out, it is possible to determine point to point variations in the mechanical and fracture properties, such as those that exist in weldments. Although ABI technique is non-intrusive, it is a state-of-the-art mechanical test that measures directly the current/local deformation behavior of the material. In this paper, we present results from studies on the application of ABI technique to determine tensile and fracture properties of ferritic steels, an austenitic stainless steel, a nickel base superalloy and Zircaloy in different thermo-mechanical conditions. The effects of aging and cold work on these properties were determined from the ABI tests. Gradients in mechanical properties of ferritic steel welds, particularly in the narrow heat-affected zone, were clearly established. ABI technique was found to be useful in determining the anisotropy in the tensile properties of Zircaloy cladding tubes. The technique has potential as a non-destructive method for assessing structural integrity of aged components. (authors)

Mathew, M.D. [Indira Gandhi Center for Atomic Research, Kalpakkam, Tamil Nadu, 603102 (India); Linga Murty, K. [North Carolina State University, Nuclear Engineering Department, Raleigh, NC 27695-7909 (United States)

2002-07-01T23:59:59.000Z

104

Physical and mechanical properties of bituminous mixtures containing oil shales  

SciTech Connect (OSTI)

Rutting of bituminous surfaces on the Jordanian highways is a recurring problem. Highway authorities are exploring the use of extracted shale oil and oil shale fillers, which are abundant in Jordan. The main objectives of this research are to investigate the rheological properties of shale oil binders (conventional binder with various percentages of shale oil), in comparison with a conventional binder, and to investigate the ability of mixes to resist deformation. The latter is done by considering three wearing course mixes containing three different samples of oil shale fillers--which contained three different oil percentages--together with a standard mixture containing limestone filler. The Marshall design method and the immersion wheel tracking machine were adopted. It was concluded that the shale oil binders displayed inconsistent physical properties and therefore should be treated before being used. The oil shale fillers have provided mixes with higher ability to resist deformation than the standard mix, as measured by the Marshall quotients and the wheel tracking machine. The higher the percentages of oil in the oil shale fillers, the lower the ability of the mixes to resist deformation.

Katamine, N.M.

2000-04-01T23:59:59.000Z

105

Argonne TTRDC - News Story - Lohse-Busch named Outstanding Researcher by  

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

Lohse-Busch named Outstanding Researcher by EPA Lohse-Busch named Outstanding Researcher by EPA Henning Lohse-Busch Lohse-Busch Argonne researcher Henning Lohse-Busch was given an Outstanding Researcher Award by the US Environmental Protection Agency (EPA) for his work supporting the 2011 EcoCAR Challenge collegiate competition. Lohse-Busch provides technical guidance on hybrid electric vehicle (HEV) dynamometer testing to the EcoCAR organizing committee. Sharing this technical expertise was especially relevant to the EPA, which is testing the student competition vehicles during EcoCAR's Spring Workshop in Ann Arbor, Mich. in March. The award recognizes Lohse-Busch's assistance and reads: "Outstanding Researcher Award: The US Environmental Protection Agency recognizes Henning Lohse-Busch for outstanding contributions in PHEV

106

Influence Of The Laser Cladding Strategies On The Mechanical Properties Of Inconel 718  

SciTech Connect (OSTI)

This work presents different experimental results of the mechanical properties of Inconel registered 718 test parts built-up by laser cladding. Recently, turbine manufacturers for aeronautical sector have presented high interest on laser cladding processes. This process allows building fully functional structures on superalloys, such as Inconel registered 718, with high flexibility on complex shapes. However, there is limited data on mechanical properties of the laser cladding structures. Moreover, the available data do not include the influence of process parameters and laser cladding strategies. Therefore, a complete study of the influence of the laser cladding parameters and mainly, the variation of the tensile strength with the laser cladding strategy is presented. The results show that there is a high directionality of mechanical properties, depending on the strategies of laser cladding process. In other words, the test parts show a fiber -like structure that should be considered on the laser cladding strategy selection.

Lamikiz, A.; Tabernero, I.; Ukar, E.; Lopez de Lacalle, L. N. [Dept. of Mechanical Engineering, University of the Basque Countr ETSII, c/Alameda Urquijo s/n, 48013 Bilbao (Spain); Delgado, J. [Grup d'enginyeria produte, proces i produccio, Universitat de Girona Av. Lluis Santalo s/n-17071 Girona (Spain)

2011-01-17T23:59:59.000Z

107

Effect of halloysite nanoclay on mechanical properties, thermal behavior and microstructure of cement mortars  

Science Journals Connector (OSTI)

Abstract Many studies have targeted the application of clay in cement composites and declared some enhancement on the properties of concrete. However there is little knowledge on nanoclays and their effect on the mechanical properties and durability of cement composites. Halloysite nanoclay is one of the subcategories of nanoclay that has been undeservedly ignored in the production of cement composites. Chemically, the outer surface of the halloysite nanotubes has properties similar to SiO2 while the inner cylinder core is related to Al2O3 which together may improve the cement matrix. In this study the mechanical properties, flowability, thermal behavior and durability of mortars containing 1, 2, 3% halloysite nanoclay were studied. Compressive strength and gas permeability of samples with 3% and 2% nanoclay were improved up to 24% and 56%, respectively. SEM, XRD, DSC tests were carried out to investigate the microstructure and chemical composition change in samples with halloysite nanoclay.

Nima Farzadnia; Abang Abdullah Abang Ali; Ramazan Demirboga; Mohammed Parvez Anwar

2013-01-01T23:59:59.000Z

108

Determination of mechanical properties of Ni-Cr-P amorphous alloys  

E-Print Network [OSTI]

DETERMINATION OF MECHANICAL PROPERTIES OF Ni-Cr-P AMORPHOUS ALLOYS A Thesis by SWAROOP KUMAR R. KONDLAPUDI Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree.... Kondlapudi, B. E. , Qsmania University Co-Chairs of Advisory Committee : Dr. A. wolfenden Dr. R. Griffin A study of the mechanical properties of Ni80 xCrxPgp amorphous alloys (x = 0 to 40 at% in steps of 5. 0) has been undertaken at Texas A&M University...

Kondlapudi, Swaroop Kumar R

2012-06-07T23:59:59.000Z

109

Mechanical properties of cold-rolled AISI 304LN steel at low temperatures  

SciTech Connect (OSTI)

Mechanical properties of 0--70% cold-rolled AISI 304LN steel (0, 16 wt.% N) were investigated by means of tensile and Charpy V-notch impact tests between room temperature and {minus}196 C. Fracture surfaces of the tested specimens were investigated using SEM (scanning electron microscope). Austenite stability against {alpha}{prime}-martensite formation during cooling and during deformation in cold-rolling and mechanical testing was determined using magnetic measurements.

Ilola, R.J.; Haenninen, H.E. [Helsinki Univ. of Technology, Espoo (Finland). Lab. of Engineering Materials; Heinaekari, M.J. [Kvaerner Masa-Yards Oy, Turku (Finland)

1996-12-01T23:59:59.000Z

110

Investigation of the effect of continuous finishing on the mechanical properties and the handle of wool fabrics  

Science Journals Connector (OSTI)

The effect of scouring, bleaching and dyeing on the low stress mechanical and surface properties of wool woven fabrics was studied. Fabric properties were ... of the treated fabrics are greatly affected by scouring

D. Sun; G. K. Stylios

2006-09-01T23:59:59.000Z

111

Thermal and mechanical properties of EPDM/PP + thermal shock-resistant ceramic composites  

E-Print Network [OSTI]

Thermal and mechanical properties of EPDM/PP + thermal shock-resistant ceramic composites Witold- nizate (TPV), a higher thermal expansion is seen after addition of the ceramic filler, a result-scale ceramic powder. To overcome the difficulty of particles dispersion and adhe- sion, the filler was modified

North Texas, University of

112

Weathering Effects on Mechanical Properties of Recycled HDPE Based Plastic Lumber  

E-Print Network [OSTI]

Weathering Effects on Mechanical Properties of Recycled HDPE Based Plastic Lumber Jennifer K. Lynch recycled plastic lumber (RPL) decking was exposed to the environment for eleven years. The weathering in the construction of the deck were a commingled recycled plastic material referred to as curbside tailings, NJCT

113

Mechanical properties of self-compacting concrete reinforced with polypropylene fibres  

E-Print Network [OSTI]

Mechanical properties of self-compacting concrete reinforced with polypropylene fibres O. Gencel*1 of workability. Self-compacting concrete (SCC) is an innovative concrete that is able to flow under its own engineers to incorporate many materials into it. A variety of types of concrete exist.7 Self-compacting

North Texas, University of

114

Studying some mechanical properties of MgO with used neon bulb glass  

SciTech Connect (OSTI)

Ceramic compact of MgO +WT% of UNBG were sintered at different sintering temperature (700, 900, 1100, 1300)c, under static air for 3 hours. X-ray diffraction and some mechanical properties were conducted. The maximum sintered density, compression; fracture strength and hardness were indicated for the compilation of MgO ?20 WT % UNBG, sintered at 1300 c.

Issa, Tarik Talib [University of Baghdad, College of science physic department , Material Science group (Iraq); Khaleel, Saba Mahdi [Ministry of Industry and Minerals,Commission for Research And Industrial Development ,Chemical and Petrochemical Research Center, Baghdad (Iraq); Abdul Kareem, Noura Ammar [Ministry of Industry and Minerals, Commission for Research And Industrial Development ,Chemical and Petrochemical Research Center, Baghdad (Iraq)

2013-12-16T23:59:59.000Z

115

Tailoring the microstructure and mechanical properties of arrays of aligned multiwall carbon nanotubes by utilizing  

E-Print Network [OSTI]

of different hydrogen concentrations on the micro- structure and mechanical properties of the resulting material. We show that a lower hydro- gen concentration during synthesis results in the growth of stiffer with predeposited catalyst (neither as a bulk material nor in the form of micro pillars) [8,10,11], with a re- cent

Daraio, Chiara

116

Mechanical properties of WC10Co cemented carbides sintered from nanocrystalline spray conversion processed powders  

E-Print Network [OSTI]

Mechanical properties of WC±10Co cemented carbides sintered from nanocrystalline spray conversion as the spray conversion process [2]. The WC particle sizes in powders fabricated by the spray conversion: microstructural parameters such as WC grain size, Co mean free path and WC/WC contiguity; chemical factors

Hong, Soon Hyung

117

Anschutz Library receives plaque recognizing outstanding efforts in energy conservation and sustainability  

E-Print Network [OSTI]

to recognize outstanding efforts in energy conservation and sustainability. Building operations manager Robert Szabo and Libraries sustainability ambassador Amalia Monroe will accept on behalf of KU Libraries. The presentation will take place at 10 am in Watson...12/5/13 Anschutz Library recognized for outstanding efforts in conservation and sustainability www.lib.ku.edu/news/anschutz.conservation.plaque.shtml 1/1 Contact Us KU Libraries Lawrence, Kansas 66045 (785) 864-8983 AT THE CROSSROADS OF PEOPLE...

2009-01-01T23:59:59.000Z

118

Outstanding Chemical and Nuclear Engineer Awards At each June Commencement, the senior class announces their selections for three department awards: outstanding senior, teaching  

E-Print Network [OSTI]

Outstanding Chemical and Nuclear Engineer Awards At each June Commencement, the senior class member. They are shown below. The two degree programs, chemical engineering and nuclear engineering, had Mann Bradley Chmelka 1995 Chemical Michael Johnson John Bomberger Orville Sandall 1994 Nuclear Mark

Bigelow, Stephen

119

Effective Mechanical Properties of Lattice Material Fabricated by Material Extrusion Additive Manufacturing  

SciTech Connect (OSTI)

In this paper, a two-step homogenization method is proposed and implemented for evaluating effective mechanical properties of lattice structured material fabricated by the material extrusion additive manufacturing process. In order to consider the characteristics of the additive manufacturing process in estimation procedures, the levels of scale for homogenization are divided into three stages the levels of layer deposition, structural element, and lattice structure. The method consists of two transformations among stages. In the first step, the transformation between layer deposition and structural element levels is proposed to find the geometrical and material effective properties of structural elements in the lattice structure. In the second step, the method to estimate effective mechanical properties of lattice material is presented, which uses a unit cell and is based on the discretized homogenization method for periodic structure. The method is implemented for cubic lattice structure and compared to experimental results for validation purposes.

Park, Sang-In [Georgia Institute of Technology, Atlanta; Choi, Seung-kyum [Georgia Institute of Technology, Atlanta; Rosen, David W [Georgia Institute of Technology, Atlanta; Duty, Chad E [ORNL

2014-01-01T23:59:59.000Z

120

Influence of oriented topological defects on the mechanical properties of carbon nanotube heterojunctions  

SciTech Connect (OSTI)

The mechanical properties of finite-length (5,0)/(8,0) single-walled carbon nanotube (SWCNT) heterojunctions with manipulated topological defects are investigated using molecular dynamics simulation calculations. The results show that the mechanical properties and deformation behavior of SWCNT heterojunctions are mainly affected not only by the diameter of the thinner segment of the SWCNT heterojunction but also by the orientation of the heptagon-heptagon (7-7) pair in the junction region. Moreover, the orientation of the 7-7 pair strongly affects those properties in the compression loading than those in tensile loading. Finally, it is found that the location of buckling deformation in the heterojunctions is dependent on the orientation of the 7-7 pair in the compression.

Lee, We-Jay [National Center for High-Performance Computing; Chang, Jee-Gong [National Center for High-Performance Computing; Yang, An-Cheng [National Center for High-Performance Computing; Wang, Yeng-Tseng [National Center for High-Performance Computing; Su, Wan-Sheng [National Center for High-Performance Computing; Wang, Cai-Zhuang [Ames Laboratory; Ho, Kai-Ming [Ames Laboratory

2013-10-10T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Effects of temperature and strain rate on the mechanical properties of silicene  

SciTech Connect (OSTI)

Silicene, a graphene-like two-dimensional silicon, has attracted great attention due to its fascinating electronic properties similar to graphene and its compatibility with existing semiconducting technology. So far, the effects of temperature and strain rate on its mechanical properties remain unexplored. We investigate the mechanical properties of silicene under uniaxial tensile deformation by using molecular dynamics simulations. We find that the fracture strength and fracture strain of silicene are much higher than those of bulk silicon, though the Young's modulus of silicene is lower than that of bulk silicon. An increase in temperature decreases the fracture strength and fracture strain of silicene significantly, while an increase in strain rate enhances them slightly. The fracture process of silicene is also studied and brittle fracture behavior is observed in the simulations.

Pei, Qing-Xiang, E-mail: peiqx@ihpc.a-star.edu.sg; Zhang, Yong-Wei, E-mail: zhangyw@ihpc.a-star.edu.sg [Institute of High Performance Computing, A-STAR, 1 Fusionopolis Way, Singapore 138632 (Singapore); Sha, Zhen-Dong [International Center for Applied Mechanics, Xi'an Jiaotong University, Xi'an 710049 (China); Zhang, Ying-Yan [School of Computing, Engineering and Mathematics, University of Western Sydney, Penrith, New South Wales 2751 (Australia)

2014-01-14T23:59:59.000Z

122

Structural and mechanical properties of single-wall carbon nanotube fibers  

SciTech Connect (OSTI)

We report quantitative experimental study correlating the structure and mechanical properties of fibers made from single-walled carbon nanotubes (SWNTs) and polyvinyl alcohol (PVA). A post-synthesis solvent drawing treatment is used to vary nanotube alignment, whose detailed understanding is a prerequisite for fiber development. Quantitative analysis of nanotube alignment within the fibers with different draw ratios is performed using x-ray scattering. The method is described in detail, and we also show that the improvement of nanotube alignment with draw ratio can be understood within a model of induced orientation at constant volume. Young's modulus and tensile strength increase with nanotube alignment. This is modeled using continuum mechanics in qualitative agreement with experiment, however quantitative differences show that nanotube alignment is not the only parameter controlling the fiber mechanical properties. We suggest that interaction between the SWNTs and PVA chains should also play a significant role.

Pichot, V.; Albouy, P. A.; Launois, P. [Laboratoire de Physique des Solides (UMR CNRS 8502), bat 510, Universite Paris Sud, 91405 Orsay (France); Badaire, S.; Zakri, C.; Poulin, P. [Centre de Recherche Paul Pascal, CNRS, Universite Bordeaux I, avenue Schweitzer, 33600 Pessac (France)

2006-12-15T23:59:59.000Z

123

Database of Mechanical and Hydrological Properties of WIPP Anhydrite Derived from Laboratory-Scale Experiments  

SciTech Connect (OSTI)

The Department of Energy (DOE) has developed the Waste Isolation Pilot Plant (WIPP) for the purpose of demonstrating safe management, storage, and disposal of radioactive transuranic (TRU) waste generated by U.S. defense programs. The WIPP is located in southeastern New Mexico, and the underground facilities of the WIPP (i.e., experimental rooms, disposal rooms, etc.) are sited in the bedded salt of the Salado Formation at a depth of about 660 meters. The DOE has authorized the continuance of scientific research and engineering analysis related to the performance of the WIPP repository. One area of additional research relates to characterization of the mechanical and hydrological properties of anhydrite interbeds within the Salado Formation. These anhydrite interbeds have been penetrated by the shafts that provide access to the underground facilities and also lie in close proximity to the proposed radioactive waste disposal rooms at the repository horizon. Properties of particular interest are mechanical strength, deforrnational behavior, and fluid transport properties such as permeability. These properties will be used in calculationskmalyses of the mechanical and hydrological behavior of the anhydrite, in particular, and the shaft sealing system and disposal rooms, in general.

Hansen, F.D.; Pfeifle, T.W.

1998-10-01T23:59:59.000Z

124

Local mechanical properties of LFT injection molded parts: Numerical simulations versus experiments  

Science Journals Connector (OSTI)

In predictive engineering for polymer processes the proper prediction of material microstructure from known processing conditions and constituent material properties is a critical step forward properly predicting bulk properties in the finished composite. Operating within the context of long-fiber thermoplastics (LFT length Autodesk Simulation Moldflow Insight 2014 software has been used. In this software a fiber breakage algorithm for the polymer flow inside the mold is available. Using well known micro mechanic formulas allow to combine the local fiber length with the local orientation into local mechanical properties. Different experiments were performed using a commercially available glass fiber filled compound to compare the measured data with the numerical simulation results. In this investigation tensile tests and 3 point bending tests are considered. To characterize the fiber length distribution of the polymer melt entering the mold (necessary for the numerical simulations) air shots were performed. For those air shots similar homogenization conditions were used as during the injection molding tests. The fiber length distribution is characterized using automated optical method on samples for which the matrix material is burned away. Using the appropriate settings for the different experiments good predictions of the local mechanical properties are obtained.

2014-01-01T23:59:59.000Z

125

A Load-based Micro-indentation Technique for Mechanical Property and NDE Evaluation  

SciTech Connect (OSTI)

A load-based micro-indentation technique has been developed for evaluating mechanical properties of materials. Instead of using measured indentation depth or contact area as a necessary parameter, the new technique is based on the indentation load, coupled with a multiple-partial unloading procedure for mechanical property evaluation. The proposed load-based micro-indentation method is capable of determining Youngs modulus of metals, superalloys, and single crystal matrices, and stiffness of coated material systems with flat, tubular, or curved architectures. This micro-indentation technique can be viewed as a viable non-destructive evaluation (NDE) technique for determining as-manufactured and process-exposed metal, superalloy, single crystal, and TBC-coated material properties. Based on this technique, several bond coated substrates were tested at various stages of thermal cycles. The time-series evaluation of test material surface stiffness reveals the status of coating strength without any alternation of the coating surface, making it a true time-series NDE investigation. The microindentation test results show good correlation with post mortem microstructural analyses. This technique also shows promise for the development of a portable instrument for on-line, in-situ NDE and mechanical properties measurement of structural components.

Bruce S. Kang; Chuanyu Feng; Jared M. Tannenbaum; M.A. Alvin

2009-06-04T23:59:59.000Z

126

Overviews on the Basic Thermal and Mechanical Properties of HANA{sup TM} Claddings  

SciTech Connect (OSTI)

The HANA{sup TM} claddings for a higher burn-up fuel have been developed for the last decade and their performance test results under out-of-pile and in-pile conditions are excellent when compared with those of reference claddings. The basic thermal and mechanical properties of the HANA{sup TM} claddings are needed to demonstrate their reliabilities during the licensing process before in-reactor tests. In this study, the basic properties, including the density, thermal expansion, heat capacity, heat conductivity, surface emissivity, Young's modulus, Poisson ratio, and hydride dependency of the HANA{sup TM} claddings were compared with reference claddings (Zircaloy-4) and further more to the MATPRO Code data based on Zircaloy-2 and Zircaloy-4. From these test results, the basic thermal and mechanical properties of the HANA{sup TM} claddings were very well close to those of the reference claddings and were comparable with the MATPRO data. It is suggested that the basic thermal and mechanical properties obtained in this study support the reliabilities of the HANA{sup TM} claddings for a commercial utilization in LWR plants. (authors)

Baek, Jong-Hyuk; Choi, Byoung-Kwon; Jeong, Yong-Hwan [Korea Atomic Energy Research Institute, P.O. Box 150, Yuseong, Deajeon, 305-600 (Korea, Republic of); Oh, Yong-Jun [Hanbat National University, San 16-1, Duckmyoung-Dong, Yuseong, Daejeon, 305-719 (Korea, Republic of)

2007-07-01T23:59:59.000Z

127

Processing and mechanical properties of silicon nitride formed by robocasting aqueous slurries  

SciTech Connect (OSTI)

Robocasting is a new freeform fabrication technique for dense ceramics. It uses robotics to control deposition of ceramic slurries through an orifice. The optimization of concentrated aqueous Si{sub 3}N{sub 4} slurry properties to achieve high green density robocast bodies and subsequent high sintered densities was investigated. The effects of pH, electrolyte, additives and solids loading on the dispersion and rheological properties of Si{sub 3}N{sub 4} slurries were determined. The mechanical behavior of sintered robocast bars was determined and compared to conventionally produced silicon nitride ceramics.

HE,GUOPING; HIRSCHFELD,DEIDRE A.; CESARANO III,JOSEPH

2000-01-26T23:59:59.000Z

128

Two-phase chromium-niobium alloys exhibiting improved mechanical properties at high temperatures  

DOE Patents [OSTI]

The specification discloses chromium-niobium alloys which exhibit improved mechanical properties at high temperatures in the range of 1250.degree. C. and improved room temperature ductility. The alloys contain a Cr.sub.2 Nb-rich intermetallic phase and a Cr-rich phase with an overall niobium concentration in the range of from about 5 to about 18 at. %. The high temperature strength is substantially greater than that of state of the art nickel-based superalloys for enhanced high temperature service. Further improvements in the properties of the compositions are obtained by alloying with rhenium and aluminum; and additional rare-earth and other elements.

Liu, Chain T. (Oak Ridge, TN); Takeyama, Masao (Tokyo, JP)

1994-01-01T23:59:59.000Z

129

Two-phase chromium-niobium alloys exhibiting improved mechanical properties at high temperatures  

DOE Patents [OSTI]

The specification discloses chromium-niobium alloys which exhibit improved mechanical properties at high temperatures in the range of 1250 C and improved room temperature ductility. The alloys contain a Cr[sub 2]Nb-rich intermetallic phase and a Cr-rich phase with an overall niobium concentration in the range of from about 5 to about 18 at. %. The high temperature strength is substantially greater than that of state of the art nickel-based superalloys for enhanced high temperature service. Further improvements in the properties of the compositions are obtained by alloying with rhenium and aluminum; and additional rare-earth and other elements. 14 figures.

Liu, C.T.; Takeyama, Masao.

1994-02-01T23:59:59.000Z

130

Effects of oxide and hydrogen on the circumferential mechanical properties of Zircaloy-4 cladding  

Science Journals Connector (OSTI)

Mechanical properties of Zircaloy-4 cladding were evaluated by the ring tension test to simulate the cladding behavior under the reactivity-initiated accident (RIA) in a high burnup environment. Zircaloy-4 cladding was controlled to have a hydrogen content up to 1000ppm and a oxide thickness up to 100?m, followed by a circumferential ring tension test with a strain rate in the range of 0.01 and 1/s. The results showed that both the ductility and toughness decreased as the hydrogen content and the oxide thickness increased. Hydride inside the cladding played an important role in the brittle failure mechanism by a decohesion between the hydride and the metal matrix as well as a preferential fracture of the brittle hydride. Surface oxide also affected the mechanical property such as a reduction of the load bearing area, stress relieving effect, and so on. Correlation between the in-reactor RIA parameters such as the fuel enthalpy and out-reactor mechanical toughness was postulated and it was concluded that the change of the mechanical toughness caused by the oxide was more significant than that by the hydrogen.

Jun Hwan Kim; Myoung Ho Lee; Byoung Kwon Choi; Yong Hwan Jeong

2006-01-01T23:59:59.000Z

131

Mechanical Properties of Aluminum Fluoride Glass Fibers James Colaizzi, M. John Matthewson, Tariq Iqbal, and Mahmoud R. Shahriari  

E-Print Network [OSTI]

#12;Mechanical Properties of Aluminum Fluoride Glass Fibers James Colaizzi, M. John Matthewson solutions of various pH values on the mechanical properties of polymer coated optical fibers of an aluminum to failure of the fiber. In static fatigue, the time to failure of the aluminum fluoride-based fibers

Matthewson, M. John

132

Composition, morphology and mechanical properties of sputtered TiAlN coating  

SciTech Connect (OSTI)

TiAlN coating was deposited on the tungsten carbide cutting tool by using DC magnetron sputtering system to study the influence of substrate bias and nitrogen flow rate on the composition, morphology and mechanical properties. The negatively substrate bias and nitrogen flow rate was varied from about ?79 to ?221 V and 30 sccm to 72 sccm, respectively. The coating composition and roughness were characterized by using SEM/EDX and Atomic Force Microscopy (AFM), respectively. The dynamic ultra micro hardness tester was used to measure the mechanical properties. The coating hardness increases to about 10-12 GPa with an increase of the negatively substrate bias up to ? 200 V and it tend to decrease with an increase in nitrogen flow rate up to 70 sccm. The increase of hardness follows the increase of Ti and N content and rms coating roughness.

Budi, Esmar, E-mail: esmarbudi@unj.ac.id [Department of Physics, Faculty of Science and Mathematics, Universitas Negeri Jakarta, Jl. Pemuda No. 10, Jakarta 13220 (Indonesia); Razali, M. Mohd. [Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka, Karung Berkunci No. 1752 Pejabat Pos Durian Tunggal 76109 Melaka (Malaysia); Nizam, A. R. Md. [Faculty of Manufacturing Engineering, UniversitiTeknikal Malaysia Melaka, Karung Berkunci No. 1752 Pejabat Pos Durian Tunggal 76109 Melaka (Malaysia)

2014-03-24T23:59:59.000Z

133

Effects of thermomechanical processing on the resulting mechanical properties of 6101 aluminum foam  

SciTech Connect (OSTI)

Porous materials represent a tremendous weight savings for light-weight structural applications. The fabrication path can play a critical role in the resulting properties. High porosity aluminum was fabricated in a number of ways. The starting material was a cast 6101 aluminum that had a relative density of 9.8%. The cast aluminum block was compressed by uniaxial, biaxial, and triaxial densification. Uniaxial compression was done at room temperature and 200 C. Biaxial compression was achieved by unidirectional rolling at room temperature and 200 C. Triaxial compression was done by cold isostatic pressing at 3.4, 6.7, and 34 MPa (0.5, 1.0, and 5.0 ksi). Metallography and mechanical test specimens were machines from the processed bars. The mechanical properties showed that the relative yield strength depended both on relative density and processing temperature.

Margevicius, R.W.; Stanek, P.W.; Jacobson, L.A.

1998-12-01T23:59:59.000Z

134

Temperature-dependent mechanical properties of single-layer molybdenum disulphide: Molecular dynamics nanoindentation simulations  

SciTech Connect (OSTI)

The temperature-dependent mechanical properties of single-layer molybdenum disulphide (MoS{sub 2}) are obtained using molecular dynamics (MD) nanoindentation simulations. The Young's moduli, maximum load stress, and maximum loading strain decrease with increasing temperature from 4.2?K to 500?K. The obtained Young's moduli are in good agreement with those using our MD uniaxial tension simulations and the available experimental results. The tendency of maximum loading strain with different temperature is opposite with that of metal materials due to the short range Stillinger-Weber potentials in MoS{sub 2}. Furthermore, the indenter tip radius and fitting strain effect on the mechanical properties are also discussed.

Zhao, Junhua, E-mail: junhua.zhao@uni-weimar.de [Jiangsu Province Key Laboratory of Advanced Manufacturing Equipment and Technology of Food, Jiangnan University, 214122 Wuxi (China) [Jiangsu Province Key Laboratory of Advanced Manufacturing Equipment and Technology of Food, Jiangnan University, 214122 Wuxi (China); Institute of Structural Mechanics, Bauhaus-University Weimar, 99423 Weimar (Germany); Jiang, Jin-Wu, E-mail: jwjiang5918@hotmail.com [Institute of Structural Mechanics, Bauhaus-University Weimar, 99423 Weimar (Germany)] [Institute of Structural Mechanics, Bauhaus-University Weimar, 99423 Weimar (Germany); Rabczuk, Timon, E-mail: timon.rabczuk@uni-weimar.de [Institute of Structural Mechanics, Bauhaus-University Weimar, 99423 Weimar (Germany) [Institute of Structural Mechanics, Bauhaus-University Weimar, 99423 Weimar (Germany); School of Civil, Environmental and Architectural Engineering, Korea University, 136-701 Seoul (Korea, Republic of)

2013-12-02T23:59:59.000Z

135

Method and apparatus for determination of mechanical properties of functionally-graded materials  

DOE Patents [OSTI]

Techniques for the determination of mechanical properties of homogenous or functionally-graded materials from indentation testing are presented. The technique is applicable to indentation on the nano-scale through the macro-scale including the geological scale. The technique involves creating a predictive load/depth relationship for a sample, providing an experimental load/depth relationship, comparing the experimental data to the predictive data, and determining a physical characteristic from the comparison.

Giannakopoulos, Antonios E. (Somerville, MA); Suresh, Subra (Wellesley, MA)

1999-01-01T23:59:59.000Z

136

Characterization of microstructures and mechanical properties of Inconel 617/310 stainless steel dissimilar welds  

SciTech Connect (OSTI)

The microstructure and mechanical properties of Inconel 617/310 austenitic stainless steel dissimilar welds were investigated in this work. Three types of filler materials, Inconel 617, Inconel 82 and 310 austenitic stainless steels were used to obtain dissimilar joint using the gas tungsten arc welding process. Microstructural observations showed that there was no evidence of any possible cracking in the weldments achieved by the nickel-base filler materials. The welds produced by 617 and 310 filler materials displayed the highest and the lowest ultimate tensile strength and total elongation, respectively. The impact test results indicated that all specimens exhibited ductile fracture. Among the fillers, Inconel 617 exhibited superlative fracture toughness (205 J). The mechanical properties of the Inconel 617 filler material were much better than those of other fillers. - Research Highlights: {yields} A fine dendritic structure was seen for the Inconel 617 weld metal. {yields} A number of cracks were initiated when the 310 SS filler metal was used. {yields} All welded samples showed ductile fracture. {yields} The Inconel 617 filler material presents the optimum mechanical properties.

Shah Hosseini, H., E-mail: h.shahhosseini@ma.iut.ac.ir; Shamanian, M.; Kermanpur, A.

2011-04-15T23:59:59.000Z

137

Mechanism-based Representative Volume Elements (RVEs) for Predicting Property Degradations in Multiphase Materials  

SciTech Connect (OSTI)

Quantitative understanding of the evolving thermal-mechanical properties of a multi-phase material hinges upon the availability of quantitative statistically representative microstructure descriptions. Questions then arise as to whether a two-dimensional (2D) or a three-dimensional (3D) representative volume element (RVE) should be considered as the statistically representative microstructure. Although 3D models are more representative than 2D models in general, they are usually computationally expensive and difficult to be reconstructed. In this paper, we evaluate the accuracy of a 2D RVE in predicting the property degradations induced by different degradation mechanisms with the multiphase solid oxide fuel cell (SOFC) anode material as an example. Both 2D and 3D microstructure RVEs of the anodes are adopted to quantify the effects of two different degradation mechanisms: humidity-induced electrochemical degradation and phosphorus poisoning induced structural degradation. The predictions of the 2D model are then compared with the available experimental measurements and the results from the 3D model. It is found that the 2D model, limited by its inability of reproducing the realistic electrical percolation, is unable to accurately predict the degradation of thermo-electrical properties. On the other hand, for the phosphorus poisoning induced structural degradation, both 2D and 3D microstructures yield similar results, indicating that the 2D model is capable of providing computationally efficient yet accurate results for studying the structural degradation within the anodes.

Xu, Wei; Sun, Xin; Li, Dongsheng; Ryu, Seun; Khaleel, Mohammad A.

2013-02-01T23:59:59.000Z

138

Mechanical property testing of irradiated zircaloy cladding under reactor transient conditions.  

SciTech Connect (OSTI)

Specimen geometries have been developed to determine the mechanical properties of irradiated Zircaloy cladding subjected to the mechanical conditions and temperatures associated with reactivity-initiated accidents (RIA) and loss-of-coolant accidents (LOCA). Miniature ring-stretch specimens were designed to induce both uniaxial and plane-strain states of stress in the transverse (hoop) direction of the cladding. Also, longitudinal tube specimens were also designed to determine the constitutive properties in the axial direction. Finite-element analysis (FEA) and experimental parameters and results were closely coupled to optimize an accurate determination of the stress-strain response and to induce fracture behavior representative of accident conditions. To determine the constitutive properties, a procedure was utilized to transform measured values of load and displacement to a stress-strain response under complex loading states. Additionally, methods have been developed to measure true plastic strains in the gauge section and the initiation of failure using real-time data analysis software. Strain rates and heating conditions have been selected based on their relevance to the mechanical response and temperatures of the cladding during the accidents.

Daum, R. S.; Majumdar, S.; Tsai, H.; Bray, T. S.; Billone, M. C.; Koss, D. A.; Motta, A. T.

2001-10-02T23:59:59.000Z

139

CuO nanostructures: Synthesis, characterization, growth mechanisms, fundamental properties, and applications  

Science Journals Connector (OSTI)

Abstract Nanoscale metal oxide materials have been attracting much attention because of their unique size- and dimensionality-dependent physical and chemical properties as well as promising applications as key components in micro/nanoscale devices. Cupric oxide (CuO) nanostructures are of particular interest because of their interesting properties and promising applications in batteries, supercapacitors, solar cells, gas sensors, bio sensors, nanofluid, catalysis, photodetectors, energetic materials, field emissions, superhydrophobic surfaces, and removal of arsenic and organic pollutants from waste water. This article presents a comprehensive review of recent synthetic methods along with associated synthesis mechanisms, characterization, fundamental properties, and promising applications of CuO nanostructures. The review begins with a description of the most common synthetic strategies, characterization, and associated synthesis mechanisms of CuO nanostructures. Then, it introduces the fundamental properties of CuO nanostructures, and the potential of these nanostructures as building blocks for future micro/nanoscale devices is discussed. Recent developments in the applications of various CuO nanostructures are also reviewed. Finally, several perspectives in terms of future research on CuO nanostructures are highlighted.

Qiaobao Zhang; Kaili Zhang; Daguo Xu; Guangcheng Yang; Hui Huang; Fude Nie; Chenmin Liu; Shihe Yang

2014-01-01T23:59:59.000Z

140

MICROSTRUCTURE AND MECHANICAL PROPERTY PERFORMANCE OF COMMERCIAL GRADE API PIPELINE STEELS IN HIGH PRESSURE GASEOUS HYDROGEN  

SciTech Connect (OSTI)

The continued growth of the world s developing countries has placed an ever increasing demand on traditional fossil fuel energy sources. This development has lead to increasing research and development of alternative energy sources. Hydrogen gas is one of the potential alternative energy sources under development. Currently the most economical method of transporting large quantities of hydrogen gas is through steel pipelines. It is well known that hydrogen embrittlement has the potential to degrade steel s mechanical properties when hydrogen migrates into the steel matrix. Consequently, the current pipeline infrastructure used in hydrogen transport is typically operated in a conservative fashion. This operational practice is not conducive to economical movement of significant volumes of hydrogen gas as an alternative to fossil fuels. The degradation of the mechanical properties of steels in hydrogen service is known to depend on the microstructure of the steel. Understanding the levels of mechanical property degradation of a given microstructure when exposed to hydrogen gas under pressure can be used to evaluate the suitability of the existing pipeline infrastructure for hydrogen service and guide alloy and microstructure design for new hydrogen pipeline infrastructure. To this end, the 2 Copyright 2010 by ASME microstructures of relevant steels and their mechanical properties in relevant gaseous hydrogen environments must be fully characterized to establish suitability for transporting hydrogen. A project to evaluate four commercially available pipeline steels alloy/microstructure performance in the presences of gaseous hydrogen has been funded by the US Department of Energy along with the private sector. The microstructures of four pipeline steels were characterized and then tensile testing was conducted in gaseous hydrogen and helium at pressures of 800, 1600 and 3000 psi. Based on measurements of reduction of area, two of the four steels that performed the best across the pressure range were selected for evaluation of fracture and fatigue performance in gaseous hydrogen at 800 and 3000 psi. This paper will describe the work performed on four commercially available pipeline steels in the presence of gaseous hydrogen at pressures relevant for transport in pipelines. Microstructures and mechanical property performances will be compared. In addition, recommendations for future work related to gaining a better understanding of steel pipeline performance in hydrogen service will be discussed.

Stalheim, Mr. Douglas [DGS Metallurgical Solutions Inc; Boggess, Todd [Secat; San Marchi, Chris [Sandia National Laboratories (SNL); Jansto, Steven [Reference Metals Company; Somerday, Dr. B [Sandia National Laboratories (SNL); Muralidharan, Govindarajan [ORNL; Sofronis, Prof. Petros [University of Illinois

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Mercury biogeochemistry: paradigm shifts, outstanding issues and research needs1 Jeroen E. Sonke1  

E-Print Network [OSTI]

Mercury biogeochemistry: paradigm shifts, outstanding issues and research needs1 Jeroen E. Sonke1.dommergue@ujf-grenoble.fr7 In press with Elsevier's Compte Rendus Geoscience8 Abstract9 Half a century of mercury research has provided scientists and policy makers with detailed10 understanding of mercury toxicology

Dintrans, Boris

142

Neil Armstrong UC Forward Innovation Award The award is given to a team of outstanding students  

E-Print Network [OSTI]

Neil Armstrong UC Forward Innovation Award The award is given to a team of outstanding students worked with them. Nominations for the Neil Armstrong UC Forward Innovation Award for Students must in solving problems. Neil Armstrong inspired generations of students to study STEM subjects to become

Papautsky, Ian

143

Effect of radial hydrides on the axial and hoop mechanical properties of Zircaloy-4 cladding  

Science Journals Connector (OSTI)

The effect of radial hydrides on the mechanical properties of stress-relief annealed Zircaloy-4 cladding was studied. Specimens were firstly hydrided to different target hydrogen levels between 100 and 600wtppm and then thermally cycled in an autoclave under a constant hoop stress to form radial hydrides by a hydride reorientation process. The effect of radial hydrides on the axial properties of the cladding was insignificant. On the other hand, the cladding ductility measurements decreased as its radial hydride content increased when the specimen was tested in plane strain tension. A reference hydrogen concentration for radial hydrides in the cladding was defined for assessing the fuel cladding integrity based on a criterion of the tensile strength 600MPa. The reference hydrogen concentration increased with the specimen (bulk) hydrogen concentration to a maximum of ?90wtppm at the bulk concentration ?300wtppm H and then decreased towards higher concentrations.

H.C. Chu; S.K. Wu; K.F. Chien; R.C. Kuo

2007-01-01T23:59:59.000Z

144

Ab-initio study of structural, mechanical and electronic properties of functionalized carbon nanotubes  

SciTech Connect (OSTI)

We present exemplary results of extensive studies of structural, mechanical and electronic properties of covalent functionalization of carbon nanotubes (CNTs). We report new results for metallic (9,0), and semiconducting (10,0) single-wall carbon nanotubes (CNT) functionalized with -COOH, -OH, and both groups with concentration up to 12.5%. Our studies are performed in the framework of the density functional theory (DFT). We discuss here the stability, local and global changes in structure, elastic moduli (Young's, Shear, and Bulk), electronic structure and resulting band gaps, as a function of the density of the adsorbed molecules.

Milowska, Karolina Z.; Birowska, Magdalena; Majewski, Jacek A. [Faculty of Physics, University of Warsaw, ul. Hoza 69, 00-681 Warszawa (Poland)

2013-12-04T23:59:59.000Z

145

Microstructural Characterization of the Chemo-mechanical Behavior of Asphalt in Terms of Aging and Fatigue Performance Properties  

E-Print Network [OSTI]

implements the framework of chemo-mechanics by investigating two types of chemical modification processes, natural (oxidative aging) and synthetic (chemical doping) as they relate not only to macro-scale properties of asphalt binder but also to the asphalt...

Allen, Robert Grover

2013-03-27T23:59:59.000Z

146

Correlation between Microstructure and Mechanical Properties of TiC Films Produced by Vacuum arc Deposition and Reactive Magnetron Sputtering  

E-Print Network [OSTI]

and mechanical properties of TiC films produced by vacuumstudied the synthesis of TiC films by vacuum arc depositionproduced a broad range of TiC x film compositions. In both

Monteiro, O.R.; Delplancke-Ogletree, M.P.; Winand, R.; Brown, I.G.

1999-01-01T23:59:59.000Z

147

Effect of Specific Energy Input on Microstructure and Mechanical Properties of Nickel-Base Intermetallic Alloy Deposited by Laser Cladding  

Science Journals Connector (OSTI)

This article describes the microstructural features and mechanical properties of nickel-base intermetallic alloy laser-clad layers on stainless steel-316L ... , with specific attention on the effect of laser-spe...

Reena Awasthi; Santosh Kumar; Kamlesh Chandra

2012-12-01T23:59:59.000Z

148

CHAPTER 2: BACKGROUND The extremely small size and outstanding physical properties of carbon  

E-Print Network [OSTI]

, nanoclays, and nanowires, while not directly addressed here, have also been proposed as candidate filler

Fisher, Frank

149

Effect of multiple repairs in girth welds of pipelines on the mechanical properties  

SciTech Connect (OSTI)

This work presents the results of multiple weld repairs in the same area in seamless API X-52 microalloyed steel pipe. Four conditions of shielded metal arc welding repairs and one as-welded specimen of the girth weld were characterized to determine changes in the microstructure, grain size in the heat affected zone, and to evaluate their effect on the mechanical properties of the weld joints. The mechanical properties by means of tension tests, Charpy-V impact resistance and Vickers hardness of the welds were analyzed. The results indicate that significant changes are not generated in the microstructural constituents of the heat affected zone. Grain growth in the heat affected zone at the specimen mid-thickness with the number of repairs was observed. Tensile strength of the weld joints meets the requirement of the API 1104 standard even after the fourth weld repair. Significant reduction in Charpy-V impact resistance with the number of weld repairs was found when the notch location was in the intersection of the fusion line with the specimen mid-thickness. A significant increase in the Vickers hardness of the heat affected zone occurred after the first repair and a gradual decrease in the Vickers hardness occurred as the number of repairs increases.

Vega, O.E.; Hallen, J.M. [Departamento de Ingenieria Metalurgica, ESIQIE-IPN, Laboratorios Pesados de Metalurgia, UPALM, Zacatenco, C.P. 07738, Mexico D.F. (Mexico); Villagomez, A. [Construcciones Maritimas Mexicanas, CMM-PROTEXA, Av. Periferica s/n, Fracc. Lomas de Holche, C.P. 24120, Cd. del Carmen, Campeche (Mexico); Contreras, A. [Instituto Mexicano del Petroleo, Investigacion en Ductos, Corrosion y Materiales, Eje Central Lazaro Cardenas Norte 152 Col. San Bartolo Atepehuacan, C.P. 07730, Mexico D.F. (Mexico)], E-mail: acontrer@imp.mx

2008-10-15T23:59:59.000Z

150

Characterisation of mechanical and thermal properties of epoxy grouts for composite repair of steel pipelines  

Science Journals Connector (OSTI)

Abstract The mechanical and thermal properties of the grouts are critical to their potential application as infill materials in structural repair. In this paper, the mechanical and thermal behaviour of five epoxy based grouts were investigated to identify their prospects as a component of the composite repair for steel pipelines. The compressive strength and stiffness of the grouts are found to be 52120MPa and 1.711GPa, respectively. The tensile, flexural and shear strengths of the grouts are found to be within the ranges of 1132, 2753, and 1330MPa, respectively. The tensile and flexural moduli range within 317, and 413GPa, respectively. Thermal analysis of the grouts suggests that the glass transition temperature (Tg) within 60 and 90C which also provide the thermal applicability limits for the grouts in the composite repair of steel pipes. The development of compressive properties of three selected grouts over 28days period was also investigated as well as the effect of the addition of coarse fillers.

Md Shamsuddoha; Md Mainul Islam; Thiru Aravinthan; Allan Manalo; Kin-tak Lau

2013-01-01T23:59:59.000Z

151

Using the anchoring device of a comet lander to determine surface mechanical properties  

Science Journals Connector (OSTI)

Owing to the low surface gravity of the Rosetta target comet 46P/Wirtanen, a means of anchoring the Rosetta Lander to the cometary surface will be necessary. This task can be accomplished by firing an anchor into the cometary soil immediately after touchdown to prevent a rebound of the spacecraft from the surface or subsequent ejection by other forces, and to allow for mechanical activities (drilling, etc.) at the landing site. The rationale for anchoring is examined, based on estimates of the main forces likely to act on the spacecraft after landing. We report on the development of an anchoring device using a pyrotechnic gas generator as a power source and an instrumented anchor. In addition to the anchoring function, which is the primary purpose of this system, the integration of acceleration and temperature sensors into the tip offers the possibility to determine some important material properties of the cometary surface layer. The accelerometer is designed to measure the deceleration history of the projectile and is thus expected to give information on how the material properties (in particular strength) change within the penetrated layer(s), while the temperature sensor will measure temperature variations at the depth at which the anchor finally comes to rest. As the mechanical properties of the material are not known, it is difficult to predict the final depth of the anchor with any great certainty, but it may well be greater than that reached by any other of the lander's instruments. The instrumented anchor will be part of the MUPUS experiment, selected to form part of the Rosetta Lander payload. We report on results of laboratory simulations of anchor penetration performed at the Institut fr Weltraumforschung, Graz, and compare these with models of projectile penetration. The value of the results expected from the penetrometry experiment in the context of an improved understanding of cometary processes is discussed.

Norbert I. Kmle; Andrew J. Ball; Gnter Kargl; Jakob Stcker; Markus Thiel; Harjinder S. Jolly; Masarapauya Dziruni; John C. Zarnecki

1997-01-01T23:59:59.000Z

152

EFFECTS OF GEOMETRICAL AND MECHANICAL PROPERTIES OF VARIOUS COMPONENTS ON STRESSES OF THE SEALS IN SOFCS  

SciTech Connect (OSTI)

In this paper, numerical modeling was used to understand of the effect of the geometry and mechanical properties of various components in SOFCs on the level and distribution of stresses in the stack during operating and cooling. The results of these modeling analyses will help stack designers reduce high stresses in the seals of the stack so that structural failures are prevented and high stack mechanical reliability is achieved to meet technical targets. In general, it was found that the load carrying capacity of the cathode contact layer was advantageous for reducing the transmitted loads on the cell perimeter seal under operating environments of SOFCs, but the amount of reduction depends upon the relative stiffness values of the cell, interconnect, porous media, and support structures. Comparison of a fully bonded interface to a frictionless sliding interface resulted in 30-50% less transmitted load through the perimeter seal, with the greater reductions due to stiffer contact/media/interconnect structures. These results demonstrate that the mechanical contribution of the contact layer can be substantial and warrant design consideration

Liu, Wenning N.; Koeppel, Brian J.; Sun, Xin; Khaleel, Mohammad A.

2010-01-01T23:59:59.000Z

153

DOE Nominees Among Outstanding Early-Career Scientists Honored by President  

Office of Science (SC) Website

» DOE Nominees » DOE Nominees Among Outstanding Early-Career Scientists Honored by President Obama News Featured Articles Science Headlines 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 Presentations & Testimony News Archives Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 12.23.13 DOE Nominees Among Outstanding Early-Career Scientists Honored by President Obama The list of researchers named today by President Obama as recipients of the Presidential Early Career Awards for Scientists and Engineers (PECASE) includes 13 nominated by the Department of Energy. Print Text Size: A A A Subscribe FeedbackShare Page The list of researchers named today by President Obama as recipients of the Presidential Early Career Awards for Scientists and Engineers (PECASE)

154

Surface characterization and mechanical property evaluation of thermally oxidized Ti-6Al-4V  

SciTech Connect (OSTI)

The present study concerns development of a thin and adherent oxide film on the surface of Ti-6Al-4V by thermal oxidation. Thermal oxidation was carried out over a range of temperature between 400 to 600 deg. C and a time from 25 h to 60 h. A detailed characterization of the surface and cross section of the oxidized surface was carried out by optical/scanning electron microscopy and X-ray diffraction techniques. Finally, the mechanical properties of the oxidized surface in terms of microindentation hardness and wear resistance were evaluated as a function of oxidation parameters. Surface oxidation of Ti-6Al-4V at 600 deg. C for 36 h offered a defect free oxide scale with improved hardness and wear resistance.

Biswas, Amit [Department of Metal. and Maters. Engg., I. I. T. Kharagpur, W. B. - 721302 (India); Dutta Majumdar, Jyotsna, E-mail: jyotsna@metal.iitkgp.ernet.in [Department of Metal. and Maters. Engg., I. I. T. Kharagpur, W. B. - 721302 (India)

2009-06-15T23:59:59.000Z

155

The effect of annealing on the microstructure and mechanical properties of Cu-X microcomposites  

SciTech Connect (OSTI)

The effect of annealing on the microstructure, texture, and room-temperature mechanical properties of in situ processed copper-based microcomposites has been investigated. These copper microcomposites, containing 15 vol pct Nb, Cr, or Ta, were produced by rolling of cast material. Annealing was carried out in vacuum for 10 hours at 250 C, 400 C, and 650 C. Evidence of microstructural coarsening was found even at the lowest annealing temperature. The through-thickness microstructure of the composites was examined by transmission electron microscopy both before and after the annealing treatments. Texture of the as-processed microcomposites was assessed using X-ray diffraction methods. The strength of the composites following annealing, was found to scale with the melting point of the second component.

Hardwick, D.A.; Rhodes, C.G. (Rockwell International Science Center, Thousand Oaks, CA (United States)); Fritzemeier, L.G. (Rocketdyne Division of Rockwell International, Canoga Park, CA (United States))

1993-01-01T23:59:59.000Z

156

Numerical simulation of temperature field, microstructure evolution and mechanical properties of HSS during hot stamping  

SciTech Connect (OSTI)

The hot stamping of boron steels is widely used to produce ultra high strength automobile components without any spring back. The ultra high strength of final products is attributed to the fully martensitic microstructure that is obtained through the simultaneous forming and quenching of the hot blanks after austenization. In the present study, a mathematical model incorporating both heat transfer and the transformation of austenite is presented. A FORTRAN program based on finite element technique has been developed which permits the temperature distribution and microstructure evolution of high strength steel during hot stamping process. Two empirical diffusion-dependent transformation models under isothermal conditions were employed respectively, and the prediction capability on mechanical properties of the models were compared with the hot stamping experiment of an automobile B-pillar part.

Shi, Dongyong; Liu, Wenquan [Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian, 116024, P.R. (China); Ying, Liang, E-mail: pinghu@dlut.edu.cn; Hu, Ping, E-mail: pinghu@dlut.edu.cn; Shen, Guozhe [Key Laboratory of Structural Analysis for Industrial Equipment, School of Automotive Engineering, Dalian University of Technology, Dalian, 116024, P.R. (China)

2013-12-16T23:59:59.000Z

157

Thermal-mechanical Properties of Epoxy-impregnated Bi-2212/Ag Composite  

SciTech Connect (OSTI)

Knowledge of the thermal-mechanical properties of epoxy/superconductor/insulation composite is important for designing, fabricating, and operating epoxy impregnated high field superconducting magnets near their ultimate potentials. We report measurements of the modulus of elasticity, Poissons ratio, and the coefficient of thermal contraction of epoxy-impregnated composite made from the state-of-the-art powder-in-tube multifilamentary Ag/Bi2Sr2CaCu2Ox round wire at room temperature and cryogenic temperatures. Stress-strain curves of samples made from single-strand and Rutherford cables were tested under both monotonic and cyclic compressive loads, with single strands insulated using a thin TiO2 insulation coating and the Rutherford cable insulated with a braided ceramic sleeve.

Li, Pei; Wang, Yang; Godeke, Arno; Ye, Liyang; Flanagan, Gene; Shen, Tengming

2014-11-26T23:59:59.000Z

158

Determination of mechanical and fracture properties of laser beam welded steel joints  

SciTech Connect (OSTI)

In the present work, two similar joints, namely, ferritic-ferritic and austenitic-austenitic and one dissimilar ferritic-austenitic joint were produced with a CO{sub 2} laser using 6-mm-thick steel plates. In addition to the testing of flat microtensile specimens, the mechanical properties were examined by microhardness survey and conventional transverse and round tensile specimens. The results of the microtensile specimens were compared with standard round tensile specimens, and this clearly showed the suitability of the microtensile specimen technique for such joints. The crack tip opening displacement (CTOD) tests were also performed to determine the fracture toughness of the LB welds using three-point bend specimens. The effect of strength heterogeneity (mismatching) across the weld joint and at the vicinity of the crack tip on the CTOD fracture toughness values was also discussed.

Cam, G.; Kocak, M. [GKSS Research Center, Geesthacht (Germany). Inst. of Materials Research; Erim, S.; Yeni, C. [Dokuz Eyluel Univ., Izmir (Turkey). Mechanical Engineering Dept.

1999-06-01T23:59:59.000Z

159

Mechanical properties of solid oxide fuel cell glass-ceramic seal at high temperatures  

SciTech Connect (OSTI)

Mechanical properties of solid oxide fuel cell glass-ceramic seal material, G18, are studied at high temperatures. Samples of G18 are aged for either 4h or 100h, resulting in samples with different crystallinity. Reduced modulus, hardness, and time-dependent behavior are measured by nanoindentation. The nanoindentation is performed at room temperature, 550, 650, and 750C, using loading rates of 5 mN/s and 25 mN/s. Results show a decrease in reduced modulus with increasing temperature, with significant decrease above the glass transition temperature (Tg). Hardness generally decreases with increasing temperature, with a slight increase before Tg for the 4h aged sample. Dwell tests show that creep increases with increasing temperature, but decrease with further aging.

Milhans, Jacqueline; Li, Dongsheng; Khaleel, Mohammad A.; Sun, Xin; Al-Haik, Marwan; Harris, Adrian; Garmestani, Hamid

2011-04-20T23:59:59.000Z

160

MECHANICAL PROPERTIES OF THIN GDP SHELLS USED AS CRYOGENIC DIRECT DRIVE TARGETS AT OMEGA  

SciTech Connect (OSTI)

OAK-B135 Thin glow discharge polymer (GDP) shells are currently used as the targets for cryogenic direct drive laser fusion experiments. These shells need to be filled with nearly 1000 atm of D{sub 2} and cooled to cryogenic temperatures without failing due to buckling and bursting pressures they experience in this process. Therefore, the mechanical and permeation properties of these shells are of utmost importance in successful and rapid filling with D{sub 2}. In this paper, they present an overview of buckle and burst pressures of several different types of GDP shells. These include those made using traditional GDP deposition parameters (standard GDP) using a high deposition pressure and using modified parameters (strong GDP) of low deposition pressure that leads to more robust shells.

NIKROO,A; CZECHOWICZ,D; CHEN,K.C; DICKEN,M; MORRIS,C; ANDREWS,R; GREENWOOD,A.L; CASTILLO,E

2003-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Structural, electronic, mechanical, and dynamical properties of graphene oxides: A first principles study  

SciTech Connect (OSTI)

We report the results of a theoretical study on the structural, electronic, mechanical, and vibrational properties of some graphene oxide models (GDO, a-GMO, z-GMO, ep-GMO and mix-GMO) at ambient pressure. The calculations are based on the ab-initio plane-wave pseudo potential density functional theory, within the generalized gradient approximations for the exchange and correlation functional. The calculated values of lattice parameters, bulk modulus, and its first order pressure derivative are in good agreement with other reports. A linear response approach to the density functional theory is used to derive the phonon frequencies. We discuss the contribution of the phonons in the dynamical stability of graphene oxides and detailed analysis of zone centre phonon modes in all the above mentioned models. Our study demonstrates a wide range of energy gap available in the considered models of graphene oxide and hence the possibility of their use in nanodevices.

Dabhi, Shweta D. [Department of Physics, Maharaja Krishnakumarsinhji Bhavnagar University, Bhavnagar 364001 (India); Gupta, Sanjay D. [V. B. Institute of Science, Department of Physics, C. U. Shah University, Wadhwan City - 363030, Surendranagar (India); Jha, Prafulla K., E-mail: prafullaj@yahoo.com [Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara-390002 (India)

2014-05-28T23:59:59.000Z

162

Effect of (? + ?) heat treatment on the mechanical properties of Zircaloy-4  

Science Journals Connector (OSTI)

The mechanical properties of Zircaloy-4 were investigated after quenched from the (? + ?) phase temperature. The microstructural observation was made and the ? ? ? transformation kinetics was analyzed. The activation energy for ? ? ? transformation was found to be 33 kcal/mol. Microhardness of constituent phases revealed that the strength of transformed ? phase was almost constant, while that of primary ? increased due to smaller grain size and oxygen enrichment. The yield strength was dependent on the strength and amount of primary ? phase and on the interactions between the phases. Two stages of work hardening existed. Up to 0.015 strain, work hardening increased when matrix was the hard primary ?, but decreased as the soft transformed ? phase became continuous. Above the 0.015 strain, the work hardening was similar to that of ?-annealed Zircaloy-4. Uniform elongation decreased remarkably for small amount of transformed ? phase, and then decreased gradually with increasing transformed ?.

Jong Sung Yoo; In Sup Kim

1991-01-01T23:59:59.000Z

163

Faculty Position in Mechanical Engineering Additive Manufacturing  

E-Print Network [OSTI]

Faculty Position in Mechanical Engineering Additive Manufacturing University of Kansas of additive manufacturing. Exceptional candidates with outstanding qualifications could be considered using additive manufacturing in applications such as, but not limited to the net shape manufacture of

164

Evaluation of mechanical properties of a low-cobalt wrought superalloy  

SciTech Connect (OSTI)

In the late 1970's and early 1980's, cobalt was subjected to significantly supply and market pressures. Those pressures caused renewed attention to the use of cobalt in aircraft engines. A NASA-sponsored program called Conservation of Strategic Aerospace Materials (COSAM) was created in response to the supply problems with cobalt and other aerospace metals. Among the work performed in the COSAM program and simultaneously by others were several studies on laboratory-size heats of wrought nickel-base super-alloys. These studies suggested that the cobalt levels of the alloys might be reduced by about half, with minimal negative impact on mechanical properties. The Lewis Research Center procured a 1,365-kg (3,000-lb) heat of a modified Waspaloy having a reduced cobalt level. This article reports the results of a program performed at four gas turbine manufacturers which evaluated the mechanical properties of forgings fabricated from that heat. The alloy chemistry selected reduced the nominal cobalt level from 13.5 to 7.75 wt %. To compensate for the anticipated strength reduction caused by a slight reduction in the amount of [gamma][prime], the nominal aluminum was increased from 1.3 to 1.5% and the titanium was increased from 3.0 to 3.2%. The increase in aluminum and titanium were intended to increase the amount of [gamma][prime] in the alloy. Tensile, creep-rupture, low-cycle fatigue, and cyclic crack growth tests were performed. In addition the effect of hydrogen on the alloy was determined. It was concluded that, in the event of a cobalt shortage, a low-cobalt modification of Waspaloy alloy could be substituted for Waspaloy with little development in those applications that are not creep-rupture limited. With some additional development to better control the grain size, it is probable that most of the current Waspaloy requirements might be met with a lower cobalt alloy.

Dreshfield, R.L. (National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center)

1993-08-01T23:59:59.000Z

165

Faculty Position in Mechanical Engineering Water Conservation in Industrial Processes  

E-Print Network [OSTI]

Faculty Position in Mechanical Engineering Water Conservation in Industrial Processes University of Kansas The Department of Mechanical Engineering at the University of Kansas is seeking applications in industrial processes. Exceptional candidates with outstanding qualifications could be considered

166

Methodology for Mechanical Property Testing of Fuel Cladding Using a Expanded Plug Wedge Test  

SciTech Connect (OSTI)

An expanded plug method was developed earlier for determining the tensile properties of irradiated fuel cladding. This method tests fuel rod cladding ductility by utilizing an expandable plug to radially stretch a small ring of irradiated cladding material. The circumferential or hoop strain is determined from the measured diametrical expansion of the ring. A developed procedure is used to convert the load circumferential strain data from the ring tests into material pseudo-stress-strain curves, from which material properties of the cladding can be extracted. However, several deficiencies existed in this expanded-plug test that can impact the accuracy of test results, such as that the large axial compressive stress resulted from the expansion plug test can potentially induce the shear failure mode of the tested specimen. Moreover, highly nonuniform stress and strain distribution in the deformed clad gage section and significant compressive stresses, induced by bending deformation due to clad bulging effect, will further result in highly nonconservative estimates of the mechanical properties for both strength and ductility of the tested clad. To overcome the aforementioned deficiencies associated with the current expansion plug test, systematic studies have been conducted. By optimizing the specific geometry designs, selecting the appropriate material for the expansion plug, and adding new components into the testing system, a modified expansion plug testing protocol has been developed. A general procedure was also developed to determine the hoop stress in the tested ring specimen. A scaling factor, -factor, was used to convert the ring load Fring into hoop stress , and is written as _ = F_ring/tl , where t is the clad thickness and l is the clad length. The generated stress-strain curve agrees well with the associated tensile test data in both elastic and plastic deformation regions.

Jiang, Hao [ORNL; Wang, Jy-An John [ORNL

2014-01-01T23:59:59.000Z

167

Solidification, growth mechanisms, and associated properties of Al-Si and magnesium lightweight casting alloys  

SciTech Connect (OSTI)

Continually rising energy prices have inspired increased interest in weight reduction in the automotive and aerospace industries, opening the door for the widespread use and development of lightweight structural materials. Chief among these materials are cast Al-Si and magnesium-based alloys. Utilization of Al-Si alloys depends on obtaining a modified fibrous microstructure in lieu of the intrinsic flake structure, a process which is incompletely understood. The local solidification conditions, mechanisms, and tensile properties associated with the flake to fiber growth mode transition in Al-Si eutectic alloys are investigated here using bridgman type gradient-zone directional solidification. Resulting microstructures are examined through quantitative image analysis of two-dimensional sections and observation of deep-etched sections showing three-dimensional microstructural features. The transition was found to occur in two stages: an initial stage dominated by in-plane plate breakup and rod formation within the plane of the plate, and a second stage where the onset of out-of-plane silicon rod growth leads to the formation of an irregular fibrous structure. Several microstructural parameters were investigated in an attempt to quantify this transition, and it was found that the particle aspect ratio is effective in objectively identifying the onset and completion velocity of the flake to fiber transition. The appearance of intricate out-of-plane silicon instability formations was investigated by adapting a perturbed-interface stability analysis to the Al-Si system. Measurements of silicon equilibrium shape particles provided an estimate of the anisotropy of the solid Si/liquid Al-Si system and incorporation of this silicon anisotropy into the model was found to improve prediction of the instability length scale. Magnesium alloys share many of the benefits of Al-Si alloys, with the added benefit of a 1/3 lower density and increased machinability. Magnesium castings often contain additions of heavier elements, such as zinc, zirconium, and rare earth elements, which significantly improve high temperature performance. However, additions of these elements can lead to macrosegregational effects in castings, which are detectable by radiographic scans. The effect of these flow-line indications on alloy mechanical properties is not well quantified. An examination of these flow-line indications and their effects on mechanical properties in three magnesium-based casting alloys was performed here in order to determine the best practice for dealing with affected castings. Preliminary results suggest the flow-lines do not measurably impact bulk material properties. Three additional methods of characterizing three-dimensional material structures are also presented: a minimum spanning tree analysis is utilized to quantify local structure in Cu-Zr liquid phase simulations obtained from molecular dynamics; the radial distribution function is applied to directionally solidified Al-Si structures in an attempt to extract local spacing data; and the critical diameter measurement is also defined and applied to irregular eutectic Al-Si structures.

Hosch, Timothy

2010-05-16T23:59:59.000Z

168

Tuning Structural and Mechanical Properties of Two-Dimensional Molecular Crystals: The Roles of Carbon Side Chains  

SciTech Connect (OSTI)

A key requirement for the future applicability of molecular electronics devices is a resilience of their properties to mechanical deformation. At present, however, there is no fundamental understanding of the origins of mechanical properties of molecular films. Here we use quinacridone, which possesses flexible carbon side chains, as a model molecular system to address this issue. Eight molecular configurations with different molecular coverage are identified by scanning tunneling microscopy. Theoretical calculations reveal quantitatively the roles of different molecule-molecule and molecule-substrate interactions and predict the observed sequence of configurations. Remarkably, we find that a single Young's modulus applies for all configurations, the magnitude of which is controlled by side chain length, suggesting a versatile avenue for tuning not only the physical and chemical properties of molecular films but also their elastic properties.

Cun, Huanyao (HY) [Institute of Physics, Chinese Academy of Science; Wang, Yeliang (YL) [Institute of Physics, Chinese Academy of Science; Du, S X [Chinese Academy of Sciences; Zhang, Lei [Institute of Physics, Chinese Academy of Science; Zhang, Lizhi [Institute of Physics, Chinese Academy of Science; Yang, Bing [Institute of Physics, Chinese Academy of Science; He, Xiaobo [Institute of Physics, Chinese Academy of Science; Wang, Yue [Jilin University, Changchun; Zhu, Xueyan [Chinese Academy of Sciences; Yuan, Quanzi [Chinese Academy of Sciences; Zhao, Ya-Pu [Chinese Academy of Sciences; Ouyang, Min [University of Maryland; Hofer, Werner A. [University of Liverpool; Pennycook, Stephen J [ORNL; Gao, Hong-jun [Institute of Physics, Chinese Academy of Science

2012-01-01T23:59:59.000Z

169

Report on Toyota/Prius Motor Torque-Capability, Torque-Property, No-Load Back EMF, and Mechanical Losses  

SciTech Connect (OSTI)

In today's hybrid vehicle market, the Toyota Prius drive system is currently considered the leader in electrical, mechanical, and manufacturing innovations. It is significant that in today's marketplace, Toyota is able to manufacture and sell the vehicle for a profit. This project's objective is to test the torque capability of the 2004 Prius motor and to analyze the torque properties relating to the rotor structure. The tested values of no-load back electromotive force (emf) and mechanical losses are also presented.

Hsu, J.S.

2004-09-30T23:59:59.000Z

170

Mo{sub 5}Si{sub 3} single crystals: Physical properties and mechanical behavior  

SciTech Connect (OSTI)

The materials processing, physical properties and mechanical behavior of an ultra-high temperature structural silicide, Mo{sub 5}Si{sub 3}, have been studied. High purity single crystals of Mo{sub 5}Si{sub 3} have been synthesized by both optical floating zone and Czochralski methods. The thermal and elastic properties of the MO{sub 5}Si{sub 3} single crystals were experimentally measured. Results show that Mo{sub 5}Si{sub 3} has significant thermal expansion anisotropy along the a and c directions with {alpha}{sub c}/{alpha}{sub a} = 2.2. Single crystal elastic moduli of Mo{sub 5}Si{sub 3} indicate that it has less elastic anisotropy and lower shear moduli than transition metal disilicides. Tensile stresses of up to 1.8 GPa can develop at grain boundaries after cooling from the melting point due to the thermal expansion mismatch in Mo{sub 5}Si{sub 3}, causing grain boundary cracking during processing of polycrystals. Room temperature Vickers indentation tests on (100) and (001) planes have been performed with different indenter diagonal orientations. The orientation dependence of hardness and fracture toughness of Mo{sub 5}Si{sub 3} single crystals have been obtained. The corresponding deformation and fracture modes have been revealed by microscopy studies. A comparison of Mo{sub 5}Si{sub 3} with other high temperature structural silicides, e.g., C11{sub b} and C40 transition metal disilicides, is discussed.

Chu, F.; Thoma, D.J.; McClellan, K.J.; Peralta, P.

1998-12-01T23:59:59.000Z

171

Statistical Comparison of the Baseline Mechanical Properties of NBG-18 and PCEA Graphite  

SciTech Connect (OSTI)

High-purity graphite is the core structural material of choice in the Very High Temperature Reactor (VHTR), a graphite-moderated, helium-cooled design that is capable of producing process heat for power generation and for industrial process that require temperatures higher than the outlet temperatures of present nuclear reactors. The Baseline Graphite Characterization Program is endeavoring to minimize the conservative estimates of as-manufactured mechanical and physical properties by providing comprehensive data that captures the level of variation in measured values. In addition to providing a comprehensive comparison between these values in different nuclear grades, the program is also carefully tracking individual specimen source, position, and orientation information in order to provide comparisons and variations between different lots, different billets, and different positions from within a single billet. This report is a preliminary comparison between the two grades of graphite that were initially favored in the two main VHTR designs. NBG-18, a medium-grain pitch coke graphite from SGL formed via vibration molding, was the favored structural material in the pebble-bed configuration, while PCEA, a smaller grain, petroleum coke, extruded graphite from GrafTech was favored for the prismatic configuration. An analysis of the comparison between these two grades will include not only the differences in fundamental and statistically-significant individual strength levels, but also the differences in variability in properties within each of the grades that will ultimately provide the basis for the prediction of in-service performance. The comparative performance of the different types of nuclear grade graphites will continue to evolve as thousands more specimens are fully characterized from the numerous grades of graphite being evaluated.

Mark C. Carroll; David T. Rohrbaugh

2013-08-01T23:59:59.000Z

172

Electronic and mechanical properties of 5d transition metal mononitrides via first principles  

SciTech Connect (OSTI)

The electronic and mechanical properties of 5d transition metal mononitrides from LaN to AuN are systematically investigated by use of the density-functional theory. For each nitride, six structures are considered, i.e., rocksalt, zinc blende, CsCl, wurtzite, NiAs and WC structures. Among the considered structures, rocksalt structure is the most stable for LaN, HfN and AuN, WC structure for TaN, NiAs structure for WN, wurtzite structure for ReN, OsN, IrN and PtN. The most stable structure for each nitride is mechanically stable. The formation enthalpy increases from LaN to AuN. For LaN, HfN and TaN, the formation enthalpy is negative for all the considered structures, while from WN to AuN, except wurtzite structure in ReN, the formation enthalpy is positive. The calculated density of states shows that they are all metallic. ReN in NiAs structure has the largest bulk modulus, 418 GPa. The largest shear modulus 261 GPa is from TaN in WC structure. Trends are discussed. - Graphical abstract: Formation enthalpy per formula unit {delta}H (eV) for all the considered structures of 5d transition metal mononitrides MN (M=La-Au). It was shown that the formation enthalpy increases from LaN to AuN. The nitrides with negative values indicate that they can be synthesized experimentally at ambient conditions.

Zhao Erjun [State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China); Graduate School, Chinese Academy of Sciences, Beijing 100049 (China); Wu Zhijian [State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China)], E-mail: zjwu@ciac.jl.cn

2008-10-15T23:59:59.000Z

173

MECHANICAL PROPERTIES AND MICROSTRUCTURAL CHARACTERIZATION OF A MULTILAYERED MULTIPASS FRICTION STIR WELD IN STEEL  

SciTech Connect (OSTI)

Multilayered multipass friction stir welding (MM-FSW) makes it possible to use FSW to fabricate thick-section structures. In this work, MM-FSW was demonstrated on a high strength low alloy steel; ASTM A572 Grade 50. Three steel plates with thicknesses of 0.18", 0.18", 0.24" respectively were stacked and friction stir welded together to form a 0.6" thick welded structure. The welded plate was sectioned into rectangular bars transverse to the weld direction for tensile testing to evaluate mechanical properties. Digital image correlation (DIC) was employed to map the local strain fields during tensile testing. The initial failure was found to occur simultaneously at the bottom and middle layers away from the weld zone. The top layer failed last in the base metal. The failure locations were consistent among different samples tested. Also, Charpy V-notch impact tests were conducted for weld metal, heat affected zone, and the base metal at each layer as a function of temperature. The weld microstructures were characterized using optical and electron microscopy and micro-hardness mapping.

Lim, Yong Chae [ORNL; Sanderson, Samuel [MegaStir Technologies LLC; Mahoney, Murray [Consultant; Qiao, Dongxiao [ORNL; Wang, Yanli [ORNL; Zhang, Wei [ORNL; Feng, Zhili [ORNL

2013-01-01T23:59:59.000Z

174

Microstructure and mechanical properties of Ni sub 3 Al-based alloys reinforced with particulates  

SciTech Connect (OSTI)

Hot-extrusion was used to produce Ni{sub 3}Al-based alloys to which 10 vol % TiN, NbC, HfO{sub 2}, or HfN was added for reinforcement. The TiN, NbC, and HfO{sub 2} particulates produced Ni{sub 3}Al-matrix composites in which no reaction was noted at the particle-matrix interface. However, the addition of HfN resulted in extensive reaction in which the hafnium appeared to diffuse into the matrix. Microstructures of this alloy showed a complex array of phases and voids where the HfN particles are presumed to have been originally. Hot hardness, compression, and compression creep tests were preformed on specimens cut from the extruded bar of each alloy. No significant strengthening was observed for the alloys containing TiN, NbC, or HfO{sub 2}. However the HfN-containing alloy did show significant strengthening in simple compression and compression creep. This presentation will include microstructures and the results of the mechanical properties tests. 26 refs., 5 figs.

McKamey, C.G.; Carmichael, C.A.

1990-01-01T23:59:59.000Z

175

Development of high void fraction polylactide composite foams using injection molding: Mechanical and thermal insulation properties  

Science Journals Connector (OSTI)

Abstract Polylactide (PLA) and PLA composites with void fractions as high as 65% were fabricated using low-pressure foam injection molding (FIM) and high-pressure FIM (HPFIM) equipped with mold opening and gas counter pressure. The cellular morphology and crystallinity were characterized using scanning electron microscopy and differential scanning calorimetry, respectively. The mechanical (flexural and impact resistance) and thermal insulation properties were also measured. Unlike, talc, the addition of nanoclay markedly enhanced the ductility of solid PLA samples as well as significantly improved the cell morphology of foamed samples, which resulted in the increased specific modulus, strength and impact resistance. In all the PLA samples made using HPFIM, with an increased void fraction up to 55%, the flexural rigidity increased up to four times, the specific impact resistance increased up to 15%, and the thermal insulation increased up to three times. The results of this investigation revealed that low-density PLA composite foams with improved rigidity, impact strength, and thermal insulation can be developed using HPFIM for various applications such as transportation and construction industries.

A. Ameli; D. Jahani; M. Nofar; P.U. Jung; C.B. Park

2014-01-01T23:59:59.000Z

176

Corrosion and its effect on mechanical properties of materials for advanced combustion systems  

SciTech Connect (OSTI)

Conceptual designs of advanced combustion systems that utilize coal as a feedstock require high-temperature furnaces and heat transfer surfaces that can operate at temperatures much higher than those prevalent in current coal-fired power plants. The combination of elevated temperatures and hostile combustion environments necessitates development and application of advanced ceramic materials in these designs. The objectives of the present program are to evaluate (a) the chemistry of gaseous and condensed products that arise during combustion of coal; (b) the corrosion behavior of candidate materials in air, slag and salt environments for application in the combustion environments; and (c) the residual mechanical properties of the materials after corrosion. The program emphasizes temperatures in the range of 1000-1400{degrees}C for ceramic materials and 600-1000{degrees}C for metallic alloys. Coal/ash chemistries developed on the basis of thermodynamic/kinetic calculations, together with slags from actual combustors, are used in the program. The materials being evaluated include monolithic silicon carbide from several sources: silicon, nitride, silicon carbide in alumina composites, silicon carbide fibers in a silicon carbide- matrix composite, and some advanced nickel-base alloys. The paper presents results from an ongoing program on corrosion performance of candidate ceramic materials exposed to air, salt and slag environments and their affect on flexural strength and energy absorbed during fracture of these materials.

Natesan, K. [Argonne National Lab., IL (United States); Freeman, M.; Mathur, M. [Pittsburgh Energy Technology Center, Pittsburgh, PA (United States)

1996-05-01T23:59:59.000Z

177

The mechanical properties of Zircaloy-2 after exposure to iodine-methanol solutions  

Science Journals Connector (OSTI)

An investigation is described into the changes in mechanical properties of Zircaloy-2 after corrosion in boiling iodinemethanol solutions. As-received specimens, 0.7 mm thick, corroded rapidly in the boiling solution (0.25 g of iodine/litre of methanol); for preoxidised specimens the presence of an intact oxide film inhibited corrosive attack in direct proportion to the oxide thickness. Preoxidised specimens showed reduced corrosion resistance after prestraining 2.0 0.25% before corrosion. Tensile tests at room temperature indicated that when the corrosion weight loss exceeded 7 mg/dm2, the strength and uniform ductility became adversely effected. Such changes were associated with extensive intergranular attack in as-received specimens or with localized intergranular attack below cracks in the oxide in preoxidised specimens. The final failure was always by a transgranular ductile tearing process. Thus above 7 mg/dm2 weight loss, corresponding to a maximum of 70 ?m intergranular penetration, the fall in strength was due to the loss of load-bearing section in this specimen geometry and section thickness.

R.D. Nicholson

1980-01-01T23:59:59.000Z

178

Degradation of the mechanical properties of Zircaloy-4 due to hydrogen embrittlement  

Science Journals Connector (OSTI)

During nuclear reactor operation, the embrittlement of components made of zirconium-based alloys is observed. The degradation of their mechanical properties is due to the combined effect of hydrogen absorption and the damage caused by neutron irradiation. In this work we studied the influence of hydrogen content on the fracture toughness of a Zircaloy-4 alloy. Compact tension (CT) specimens were obtained from a hot-rolled, annealed and finally cold-rolled material. The observed microstructure consisted of ?-Zr rounded grains with diameters of about 15 ?m. Selection of the tested material was guided by the need to perform experiments on samples with a texture equivalent to the cladding components of Candu-type nuclear reactors. The specimens were fatigue precracked and hydrogen charged before testing. Two different reactions were performed. Specimens with a final hydrogen content ranging from 10 to 400 ppm were obtained by electrochemical charging and those with a final concentration of up to 2000 ppm were charged by absorption under a gaseous atmosphere. In both cases, an homogeneous distribution of dissolved hydrogen and hydride phases was obtained. The dependence of the toughness on temperature and hydrogen content was measured on CT specimens. The analysis was performed in terms of J-integral and resistance curves.

G Bertolino; G Meyer; J Perez Ipia

2002-01-01T23:59:59.000Z

179

Anharmonicity, mechanical instability, and thermodynamic properties of the Cr-Re -Mauro Palumbo, Suzana G. Fries, Alain Pasturel, and Dario Alf  

E-Print Network [OSTI]

Anharmonicity, mechanical instability, and thermodynamic properties of the Cr-Re - phase Mauro instability, and thermodynamic properties of the Cr-Re -phase Mauro Palumbo,1,a) Suzana G. Fries,1 Alain

Alfè, Dario

180

46.1 Shear Viscosity An important mechanical property of fluids is viscosity. Physical systems and applications as diverse as  

E-Print Network [OSTI]

46-1 46.1 Shear Viscosity An important mechanical property of fluids is viscosity. Physical systems involve fluid flow and are controlled to some degree by fluid viscosity. Viscosity is the tendency, viscosity is related to molecular dif- fusion and depends on the interactions between molecules or

Kostic, Milivoje M.

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Journal of ELECTRONIC MATERIALS, Vol. 34, No. 5, 2005 Special Issue Paper Microstructure and Mechanical Properties of Ceramic/  

E-Print Network [OSTI]

with ceramic films because of shrinkage and thermal ex- pansion mismatch. In addition, ceramic processing and Mechanical Properties of Ceramic/ Self-Assembled Monolayer Bilayer Coatings K. CHITRE,1 Q. YANG,1 T.O. SALAMI York at Binghamton. 3.--jcho@binghamton.edu Thin ceramic coatings/films find their applications

Cho, Junghyun

182

Comment on Solid Recovered Fuel: Materials Flow Analysis and Fuel Property Development during the Mechanical Processing of Biodried Waste  

Science Journals Connector (OSTI)

Comment on Solid Recovered Fuel: Materials Flow Analysis and Fuel Property Development during the Mechanical Processing of Biodried Waste ... Validated material flow models of waste treatment systems form a sound basis to evaluate system performance in view of environmental pollution as well as with respect to resource recovery. ... characteristics of refuse-derived fuels (RDF) that are processed from residual household waste by mech. ...

David Laner; Oliver Cencic

2013-12-05T23:59:59.000Z

183

Materials Science and Engineering A261 (1999) 4452 Mo5Si3 single crystals: physical properties and mechanical behavior  

E-Print Network [OSTI]

. Among these phases, refractory metal silicides appear to be more attractive because of their ultra-high melting temperatures [1]. Among the refractory metal silicides, the silicides in the Mo­Si system show processing, physical properties and mechanical behavior of an ultrahigh temperature structural silicide, Mo5

184

2758 IEEE TRANSACTIONS ON MAGNETICS, VOL. 37, NO. 4, JULY 2001 Evaluation of Mechanical Properties of Magnetic  

E-Print Network [OSTI]

. Swartzendruber, G. E. Hicho, and Harsh Deep Chopra Abstract--A magnetic-based nondestructive evaluation (NDE to correlate the magnetic and mechanical properties in ultra low carbon (ULC) steel. The NDE test equipment-based nondestructive evaluation (NDE) method [1]­[6]. In the present study, a magnetic based NDE method is described

Chopra, Harsh Deep

185

Mechanical and Electrical Properties of CdTe Tetrapods Studied by Atomic Force Microscopy  

E-Print Network [OSTI]

Electrical Properties of CdTe Tetrapods Studied by Atomicelectrical properties of CdTe tetrapod-shaped nanocrystalsIntroduction CdSe and CdTe nanocrystals possess interesting

2008-01-01T23:59:59.000Z

186

ACOUSTICAL IMAGING AND MECHANICAL PROPERTIES OF SOFT ROCK AND MARINE SEDIMENTS  

SciTech Connect (OSTI)

The research during this project has concentrated on developing a correlation between rock deformation mechanisms and their acoustic velocity signature. This has included investigating: (1) the acoustic signature of drained and undrained unconsolidated sands, (2) the acoustic emission signature of deforming high porosity rocks (in comparison to their low porosity high strength counterparts), (3) the effects of deformation on anisotropic elastic and poroelastic moduli, and (4) the acoustic tomographic imaging of damage development in rocks. Each of these four areas involve triaxial experimental testing of weak porous rocks or unconsolidated sand and involves measuring acoustic properties. The research is directed at determining the seismic velocity signature of damaged rocks so that 3-D or 4-D seismic imaging can be utilized to image rock damage. These four areas of study are described in the report: (1) Triaxial compression experiments have been conducted on unconsolidated Oil Creek sand at high confining pressures. (2) Initial experiments on measuring the acoustic emission activity from deforming high porosity Danian chalk were accomplished and these indicate that the AE activity was of a very low amplitude. (3) A series of triaxial compression experiments were conducted to investigate the effects of induced stress on the anisotropy developed in dynamic elastic and poroelastic parameters in rocks. (4) Tomographic acoustic imaging was utilized to image the internal damage in a deforming porous limestone sample. Results indicate that the deformation damage in rocks induced during laboratory experimentation can be imaged tomographically in the laboratory. By extension the results also indicate that 4-D seismic imaging of a reservoir may become a powerful tool for imaging reservoir deformation (including imaging compaction and subsidence) and for imaging zones where drilling operation may encounter hazardous shallow water flows.

Thurman E. Scott, Jr.; Younane Abousleiman

2004-04-01T23:59:59.000Z

187

Explosion bonding of dissimilar materials for fabricating APS front end components: Analysis of metallurgical and mechanical properties and UHV applications  

SciTech Connect (OSTI)

The front end beamline section contains photon shutters and fixed masks. These components are made of OFHC copper and GlidCOP AL-15. Stainless steels (304 or 316) are also used for connecting photon shutters and fixed masks to other components that operate in the ultrahigh vacuum system. All these dissimilar materials need to be joined together. However, bonding these dissimilar materials is very difficult because of their different mechanical and thermal properties and incompatible metallurgical properties. Explosion bonding is a bonding method in which the controlled energy of a detonating explosive is used to create a metallurgical bond between two or more similar or dissimilar materials. No intermediate filler metal, for example, a brazing compound or soldering alloy, is needed to promote bonding, and no external heat need be applied. A study of the metallurgical and mechanical properties and YGV applications of GlidCop AL-15, OFHC copper, and 304 stainless steel explosion-bonded joints has been done. This report contains five parts: an ultrasonic examination of explosion-bonded joints and a standard setup; mechanical-property and thermal-cycle tests of GlidCop AL-15/304 stainless steel explosion-bonded joints; leak tests of a GlidCop AL-15/304 stainless steel explosion-bonded interfaces for UHV application; metallurgical examination of explosion-bonded interfaces and failure analysis, and discussion and conclusion.

Li, Yuheng; Shu, Deming; Kuzay, T.M.

1994-06-15T23:59:59.000Z

188

Effect of crude palm oil as plasticiser on the mechanical and morphology properties of low density polyethylene blown film  

Science Journals Connector (OSTI)

This paper presents a study on the mechanical and morphology properties of low density polyethylene (LDPE) blown film modified with crude palm oil (CPO). The effect of the crude palm oil as plasticiser on LDPE matrix has been studied. The LDPE were compounded with 1%, 3% and 5% of crude palm oil in a co-rotating twin screw extruder and pelletised. The blends were processed using blow thin film machine. The results on tensile properties were showed the gradual enhanced the elongation at break about 79% to 90% in machine direction (MD) and transverse direction (TD) and gradually decreased the tensile strength about 9%. The rupture properties of LDPE modified with CPO showed the decrement pattern due to the plastisticisation effect. The fracture mechanism of modified LDPE was also investigated from scanning electron microscope micrographs which clearly indicated the orientation strengthening consistently with the result in mechanical properties. From Fourier transmission infra-red (FTIR) spectras, the presence of CPO showed the addition peak in 1,745 to 1,747 cm?1 region indicated the physical interaction between molecular of polyolefins and CPO. These observations have important implication as an alternative environmental friendly plasticiser based from renewable resources for polymeric materials.

Emiliana Rose Jusoh; Mohd Halim Shah Ismail; Luqman Chuah Abdullah; Robiah Yunus; Wan Aizan Wan Abdul Rahman

2013-01-01T23:59:59.000Z

189

ACOUSTICAL IMAGING AND MECHANICAL PROPERTIES OF SOFT ROCK AND MARINE SEDIMENTS  

SciTech Connect (OSTI)

Three major goals were accomplished during this phase. First, a study was completed of the effects of stress-induced changes in anisotropic elastic moduli in sandstone. Second, a new method for measuring the anisotropic poroelastic moduli from acoustic data was developed. Third, a series of triaxial experiments were conducted on unconsolidated sands to identify pressure/stress conditions where liquefaction occurs under high confining pressures. Stress-induced changes in anisotropic Young's moduli and shear moduli were observed during deformational pathway experiments. A new method was made for the acquisition of compressional and shear wave velocities along a series of 3-dimensional raypaths through a core sample as it is subjected to deformation. Three different deformational pathway experiments were conducted. During the hydrostatic deformation experiment, little or no anisotropy was observed in either the Young's moduli or shear moduli. Significant deformational anisotropies were observed in both moduli during the uniaxial strain test and the triaxial compression experiment but each had a different nature. During the triaxial experiment the axial and lateral Young's moduli and shear moduli continued to diverge as load was applied. During the uniaxial strain experiment the anisotropy was ''locked in'' early in the loading phase but then remained steady as both the confining pressure and axial stress were applied. A new method for measuring anisotropic Biot's effective stress parameters has also been developed. The method involves measuring the compressional and shear wave velocities in the aforementioned acoustic velocity experiments while varying stress paths. For a stress-induced transversely isotropic medium the acoustic velocity data are utilized to calculate the five independent elastic stiffness components. Once the elastic stiffness components are determined these can be used to calculate the anisotropic Biot's effective stress parameters, {alpha}{sub v} and {alpha}{sub h}, using the equations of Abousleiman et al. (1996). A series of experiments have been conducted, on an initially inherently isotropic Berea sandstone rock sample, to dynamically determine these anisotropic Biot's parameters during deformational pathway experiments. Data acquired during hydrostatic, triaxial, and uniaxial strain pathway experiments indicates that Biot's effective stress parameter changes significantly if the applied stresses are not hydrostatic. Variations, as large as 20% between the axial (vertical) and lateral (horizontal) Biot's effective stress parameters, were observed in some experiments. A series of triaxial compression experiments have been conducted on unconsolidated sand (Oil Creek sand) to determine the pressure/stress conditions which would be favorable for liquefaction. Liquefaction of geopressured sands is thought to be one of the major causative mechanisms of damaging shallow water flows. The experiments were developed to determine if: (1) liquefaction could be made to occur in this particular sand at high confining pressures, and (2) the state of liquefication had the same nature at high pressure conditions typical of shallow water flows as it does in low confining pressure soil mechanics tests. A series of undrained triaxial experiments were successfully used to document that the Oil Creek sand could undergo liquefaction. The nature (i.e., the shape of the deformational pathway in mean pressure/shear stress space) was very similar to those observed in soil mechanics experiments. The undrained triaxial experiments also indicated that this sand would strain soften at relatively high confining pressures--a necessary precursor to liquefaction. These experiments serve as a starting point for a series of acoustic experiments to determine the signature of compressional and shear wave properties as the sand packs approach the state of liquefaction (and shallow water flows).

Thurman E. Scott, Jr., Ph.D.; Younane Abousleiman, Ph.D.; Musharraf Zaman, Ph.D., P.E.

2002-04-30T23:59:59.000Z

190

NUMERICAL MODELLING OF AUTOGENOUS HEALING AND RECOVERY OF MECHANICAL PROPERTIES IN ULTRA-HIGH  

E-Print Network [OSTI]

, hydro-chemo- mechanical coupling ABSTRACT Cracks, caused by shrinkage or external loading, reduce. In this study, a hydro-chemo-mechanical model was developed to simulate autogenous healing by further hydration into water was modelled based on micro-mechanical observations. The diffusion process has been simulated

Boyer, Edmond

191

Replication of engine block cylinder bridge microstructure and mechanical properties with lab scale 319 Al alloy billet castings  

SciTech Connect (OSTI)

In recent years, aluminum alloy gasoline engine blocks have in large part successfully replaced nodular cast iron engine blocks, resulting in improved vehicle fuel efficiency. However, because of the inadequate wear resistance properties of hypoeutectic AlSi alloys, gray iron cylinder liners are required. These liners cause the development of large tensile residual stress along the cylinder bores and necessitate the maximization of mechanical properties in this region to prevent premature engine failure. The aim of this study was to replicate the engine cylinder bridge microstructure and mechanical properties following TSR treatment (which removes the sand binder to enable easy casting retrieval) using lab scale billet castings of the same alloy composition with varying cooling rates. Comparisons in microstructure between the engine block and the billet castings were carried out using optical and scanning electron microscopy, while mechanical properties were assessed using tensile testing. The results suggest that the microstructure at the top and middle of the engine block cylinder bridge was successfully replicated by the billet castings. However, the microstructure at the bottom of the cylinder was not completely replicated due to variations in secondary phase morphology and distribution. The successful replication of engine block microstructure will enable the future optimization of heat treatment parameters. - Highlights: A method to replicate engine block microstructure was developed. Billet castings will allow cost effective optimization of heat treatment process. The replication of microstructure in the cylinder region was mostly successful. Porosity was more clustered in the billet castings compared to the engine block. Mechanical properties were lower in billet castings due to porosity and inclusions.

Lombardi, A., E-mail: a2lombar@ryerson.ca [Centre for Near-net-shape Processing of Materials, Ryerson University, 101 Gerrard Street East, Toronto, Ontario M5B2K3 (Canada); D'Elia, F.; Ravindran, C. [Centre for Near-net-shape Processing of Materials, Ryerson University, 101 Gerrard Street East, Toronto, Ontario M5B2K3 (Canada); MacKay, R. [Nemak of Canada Corporation, 4600 G.N. Booth Drive, Windsor, Ontario N9C4G8 (Canada)

2014-01-15T23:59:59.000Z

192

Proceedings of 7th Pacific Rim Bio-based Composite Symposium. Nanjing, China. October Mechanical Properties and Decay Resistance of Wood-Polymer  

E-Print Network [OSTI]

. Mechanical Properties and Decay Resistance of Wood-Polymer Composites Modified with Chitosan Copper Complexes complexes (CCC); fungal decay resistance; mechanical properties; wood-polymer composite ABSTRACT Wood-polymer composites (WPC) have been extensively used for building products, automotive, packaging materials, and other

193

INTERRELATIONS OF COMPOSITIONS, TRANSFORMATION KINETICS, MORPHOLOGY, AND MECHANICAL PROPERTIES OF ALLOY STEELS  

E-Print Network [OSTI]

sensitive to hydrogen embrittlement, whereas high strengthembrittlement, A generally accepted embrittling mechanism for stress corrosion cracking of high strength steels involves hydrogen

Parker, E.R.

2010-01-01T23:59:59.000Z

194

The Effect of Excess Carbon on the Crystallographic, Microstructural, and Mechanical Properties of CVD Silicon Carbide Fibers  

SciTech Connect (OSTI)

Silicon carbide (SiC) fibers made by chemical vapor deposition (CVD) are of interest for organic, ceramic, and metal matrix composite materials due their high strength, high elastic modulus, and retention of mechanical properties at elevated processing and operating temperatures. The properties of SCS-6{trademark} silicon carbide fibers, which are made by a commercial process and consist largely of stoichiometric SiC, were compared with an experimental carbon-rich CVD SiC fiber, to which excess carbon was added during the CVD process. The concentration, homogeneity, and distribution of carbon were measured using energy dispersive x-ray spectroscopy (SEM/EDS). The effect of excess carbon on the tensile strength, elastic modulus, and the crystallographic and microstructural properties of CVD silicon carbide fibers was investigated using tensile testing, x-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM).

Marzik, J V; Croft, W J; Staples, R J; MoberlyChan, W J

2006-12-05T23:59:59.000Z

195

Mechanical properties of polypropylene-fiber reinforced concrete after gamma irradiation  

E-Print Network [OSTI]

and Engineering and Center for Advanced Research and Technology (CART), University of North Texas, 1150 Union properties of hydraulic concretes elaborated with Port- land cement, water, silica sand, marble

North Texas, University of

196

Mechanical, thermal and transport properties of nitrile rubber (NBR)nanoclay composites  

Science Journals Connector (OSTI)

The article describes the properties of nitrile rubber (NBR)nanoclay composites prepared by a two-step method. ... 1 [by weight] masterbatch of NBR and nanoclay followed by compounding on a two roll ... diffusio...

Meera Balachandran; S. S. Bhagawan

2012-02-01T23:59:59.000Z

197

Compaction Effects on Uniformity, Moisture Diffusion, and Mechanical Properties of Asphalt Pavements  

E-Print Network [OSTI]

Field compaction of asphalt mixtures is an important process that influences performance of asphalt pavements; however there is very little effort devoted to evaluate the influence of compaction on the uniformity and properties of asphalt mixtures...

Kassem, Emad Abdel-Rahman Ahmed

2011-08-08T23:59:59.000Z

198

Harvard Catalyst Pathway for Independence in Clinical and Translational Research In order to facilitate the development of outstanding clinical and translational investigators,  

E-Print Network [OSTI]

Harvard Catalyst Pathway for Independence in Clinical and Translational Research In order to facilitate the development of outstanding clinical and translational investigators, Harvard Catalyst

Church, George M.

199

Mechanical properties and modeling of seal-forming lithologies. Technical progress report No. 2, March 15, 1991--March 14, 1992  

SciTech Connect (OSTI)

Both rocksalt and shale lithologies are actively deformed in response to gravitational loads associated with deposition, and both form effective seals to petroleum and natural gas. Thus, the shapes of seal-forming units, and the nature of fractures and faults that may breach them depend upon either the mechanical properties of salt or those of shale, and the loading histories to which they have been subjected. The objectives of this research include the determination of the mechanical properties under controlled conditions of well-characterized shales, and the numerical modeling of rocksalt (and eventually shale) formations using laboratory-based rheologies. Progress has been made towards these goals over this project period, both in our experimental program on shale deformation and model development for the growth of salt diapirs. The mechanical anisotropy of an illite-bearing shale from Louisiana has been determined and related to the preferred orientation and distribution of clays. Its strength in the absence of pore fluids has been determined at confining pressures of up to 250 MPa and at high pressure we have investigated the effects of deformation rate and temperature. A numerical finite difference code has been developed to solve the incompressible Navier-Stokes equations and validated using a two- layer linear viscous model for which analytic solutions are available. Although the code has only been validated for the linear viscous case, it is capable of solving for highly nonlinear constitutive laws as well as solving for arbitrary interfaces between the salt and overburden.

Kronenberg, A.K.; Russell, J.E.; Carter, N.L.; Ibanez, W.; Mazariegos, R.

1992-04-01T23:59:59.000Z

200

Strength Degradation of Mechanical Properties of Unidirectional E- Glass Fiber Epoxy Resin Nanoclay Composites under Hygrothermal Loading Conditions  

Science Journals Connector (OSTI)

Abstract Glass fiber reinforced polymer (GFRP) plays a vital role in many industries because of its high strength to weight ratio. Its strength properties are somewhat lower than carbon fibre and it is less stiff and brittle. Using glass fibre in industries because of its raw material is much less expensive with compare to other materials. In the present work, the epoxy resin was modified using natural montmorillonite Closite 30B (1 wt%, 3 wt%, 5 wt%) nanoclay is used with E-glass unidirectional fiber to manufacture fiber reinforced nanocomposite using hand layup method. Three different types of fiber reinforced nanocomposites are fabricated using 1wt% nanoclay, 3wt% nanoclay and 5wt% nanoclay with 30% wt fiber, epoxy resin and hardener. The epoxy resin and hardener are mixed in 10:4 weight ratios. Three different test, tensile test, hardness test and flexural test were measured through using mechanical test instruments. The mechanical test shows that the tensile and flexural strength for 3wt% nanoclay composite is more compared to 1wt% and 5wt% nanoclay composite. To improve the flexural and tensile properties are 57% and 8% respectively by adding 3wt% of nanoclay. Micro hardness test for 3wt% of nanoclay composite is higher compare to 1wt% and 5wt% nanoclay composite and further increase beyond 3wt% nanoclay hardness start decreasing .Further check durability the specimen were immersed in water and NaOH baths under accelerated hygrothermal loading for 30 days. Due to accelerated hygrothermal loading it is observed that the mechanical properties degradation in NaOH environment was more severe as compared to simple water.

S.K. Singh; S. Singh; S. Sharma; V. Sharma

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Carbon nanotubes based ultrasonic transducer: realization process, morphological and mechanical properties  

E-Print Network [OSTI]

Carbon nanotubes based ultrasonic transducer: realization process, morphological and mechanical in cementitous materials, carbon nanotubes based capacitive ultrasonic transducers (cMUT) are promising sensors (1 µm²). In the proposed device, the cMUT membrane is made of aligned single-walled carbon nanotubes

Paris-Sud XI, Université de

202

Mechanical Properties of Bovine Rhodopsin and Bacteriorhodopsin: Possible Roles in Folding and Function  

E-Print Network [OSTI]

in rhodopsin but not in bacteriorhodopsin. This core may reflect differences in mechanisms of protein folding their adaptation to differing functions. Introduction Protein folding is one of the most challenging problems protein folding. For more than a decade, the atomic force microscope (AFM) has permitted the use of single

Palczewski, Krzysztof

203

The Importance of Geochemical Parameters and Shale Composition on Rock Mechanical Properties of Gas Shale Reservoirs: a Case Study From the Kockatea Shale and Carynginia Formation From the Perth Basin, Western Australia  

Science Journals Connector (OSTI)

Evaluation of the gas shale mechanical properties is very important screening criteria ... for hydraulic fracturing and as a result in gas shale sweet spot mapping. Youngs modulus and ... mechanical properties t...

Mohammad Mahdi Labani; Reza Rezaee

2014-06-01T23:59:59.000Z

204

Fish Gelatin-Nanoclay Composite Film. Mechanical and Physical Properties, Effect of Enzyme Cross-Linking, and as a Functional Film Layer.  

E-Print Network [OSTI]

??The effect of clay content, homogenization RPM, and pH on the mechanical and barrier properties of fish gelatin/nanoclay composite films was investigated. The addition of (more)

Bae, Hojae

2007-01-01T23:59:59.000Z

205

Microstructure and Mechanical Properties of n-irradiated Fe-Cr Model Alloys  

SciTech Connect (OSTI)

High chromium ( 9-12 wt %) ferritic/martensitic steels are candidate structural materials for future fusion reactors and other advanced systems such as accelerator driven systems (ADS). Their use for these applications requires a careful assessment of their mechanical stability under high energy neutron irradiation and in aggressive environments. In particular, the Cr concentration has been shown to be a key parameter to be optimized in order to guarantee the best corrosion and swelling resistance, together with the least embrittlement. In this work, the characterization of the neutron irradiated Fe-Cr model alloys with different Cr % with respect to microstructure and mechanical tests will be presented. The behavior of Fe-Cr alloys have been studied using tensile tests at different temperature range ( from -160 deg. C to 300 deg. C). Irradiation-induced microstructure changes have been studied by TEM for two different irradiation doses at 300 deg. C. The density and the size distribution of the defects induced have been determined. The tensile test results indicate that Cr content affects the hardening behavior of Fe-Cr binary alloys. Hardening mechanisms are discussed in terms of Orowan type of approach by correlating TEM data to the measured irradiation hardening. (authors)

Matijasevic, Milena; Al Mazouzi, Abderrahim [Reactor materials research, SCK-CEN, Mol (Belgium)

2008-07-01T23:59:59.000Z

206

\\{WS8e4\\} - EFFECT OF HYDRIDES ON THE MECHANICAL PROPERTIES OF ZIRCALOY-4  

Science Journals Connector (OSTI)

ABSTRACT In order to better understand the embrittlement of Zircaloy-4 by hydrides and the ductile-brittle transition on this alloy, Zircaloy-4 sheet tensile specimens in the stress-relieved, recrystallized and ? treated states were hydrided (10 to 1500 ppm wt H) and then tested at two temperatures (20C, 350C). Metallographic and fractographic analyses were carried out to determine the fracture micro-mechanisms. The results showed that, at 20C, Zircaloy-4 undergoes a significant ductile to brittle transition for high hydrogen contents. Heat treatment shifts this transition (to zero elongation) considerably, from 1050 ppm wt H for the stress-relieved state to less than 250 ppm wt H for the ? treated state. However, at 350C, Zircaloy-4 remains ductile up to hydrogen content higher than 1100 ppm wt. At 20C, the fracture surfaces are characterized by voids and secondary cracks for low and medium hydrogen contents, and by intergranular crack and decohesion through the continuous hydride network for high hydrogen content. A model based on image analysis and hydride embrittlement micro-mechanism observations is used to calculate the upper-limit hydrogen content which makes Zircaloy-4 totally brittle. The difference between the mechanical behaviors of stress-relieved and recrystallized states is also explained. KEYWORDS Zircaloy-4, hydride embrittlement, ductile-brittle transition, cracked-hydride voids.

J.B. BAI; C. PRIOUL; D. FRANOIS

1992-01-01T23:59:59.000Z

207

Mechanical Properties, sliding wear and solid particle erosion behaviors of plasma enhanced magnetron sputtering CrSiCN coating Systems  

Science Journals Connector (OSTI)

Abstract CrSiCN coating systems with different concentrations of Cr, Si, C, and N were investigated for their microstructure, mechanical properties (hardness H, elastic modulus E and indentation fracture toughness KIC) and tribological behaviors using SEM, nano-indentation, indentation, pin-on-disk wear test, and sand particle erosion test. The wear behaviors, such as specific wear rate and Archard wear coefficient, showed inverse relationships with H3/E2 ratio, confirming that the resistance to plastic deformation is the essential factor governing sliding wear behavior. High H3/E2 ratios also contributed to increased resistances to erosion at low impingement angles. However, at higher impingement angles (>60), coatings with lower index of brittleness (B=2.656m?1/2), higher critical load (P?=6.670N) for crack initiation and fracture surface energy (?f=0.123 Jm?2) offered a higher erosion resistance. The indentation fracture toughness (KIC), hardness (H) and elastic modulus (E) are limited to interpret erosion behaviors in a comprehensive approach, suggesting that erosion is a complex process where multiple mechanical properties contribute to erosion performance.

Feng Cai; Xiao Huang; Qi Yang

2014-01-01T23:59:59.000Z

208

Effects of thermomechanical processing on in-reactor corrosion and post-irradiation mechanical properties of Zircaloy-2  

SciTech Connect (OSTI)

Interest continues to be high in the effects of irradiation on the microstructure and microchemistry of Zircaloy and on the resultant effects on performance of Zircaloy components in-reactor. In this study, the authors have investigated the behavior of material prepared to have excellent resistance to nodular corrosion in a BWR. Coupon specimens of Zircaloy-2 were prepared having a range of critical microstructural parameters by varying the thermomechanical processing history. Irradiation was conducted in a BWR at 561 K to fluences between 1.3 and 8.5 {times} 10{sup 25} n/m{sup 2}. As expected, nodular corrosion was absent in these materials, and, at low fluence, corrosion and hydriding of all materials was very low. At the highest fluences, patch-type uniform corrosion developed, with oxide thickness increasing with decreasing initial precipitate size. Detailed STEM investigation revealed that precipitates dissolved and decreased in size continuously until at the highest fluence no precipitates remained for material having the smallest initial precipitate size. Post-irradiation mechanical property tests showed strength somewhat higher than expected. The results indicate that corrosion resistance and mechanical properties change as the microstructure evolves during irradiation. However, at the highest fluence tested, strength, ductility, and corrosion resistance ensure excellent performance of BWR components.

Huang, P.Y.; Mahmood, S.T.; Adamson, R.B. [GE Nuclear Energy, Pleasanton, CA (United States). Vallecitos Nuclear Center

1996-12-31T23:59:59.000Z

209

Helium effects on the mechanical properties of neutron-irradiated Cr-Mo ferritic steels  

SciTech Connect (OSTI)

In the first wall of a fusion rector, large amounts of transmutation helium will be produced simultaneously with the displacement damage caused by high-energy neutrons from the fusion reaction. One method used to simulate irradiation effects for ferritic steels is to add nickel to the steels and irradiate them in a mixed-spectrum reactor. Fast neutrons in the spectrum produce displacement damage, while transmutation helium is produced by a two-step reaction of {sup 58}Ni with thermal neutrons. This technique has been used to investigate the effect of helium on tensile properties and toughness. Results from these studies are summarized.

Klueh, R.L.

1990-01-01T23:59:59.000Z

210

Effect of thermomechanical processing on mechanical properties of Fe-16 at. % Al alloy  

SciTech Connect (OSTI)

An iron-aluminum alloy containing 16 at. % Al, which is essentially free from environmental effect on its ductility, has been developed. This alloy has over 20% elongation at room temperature. This paper presents in detail the effect of vacuum versus air melting on the properties of Fe-16 at. % Al alloy. The comparative results have shown air-induction melting to produce lower room-temperature ductility for the identical processing steps. Additional processing steps required to improve the ductility of air-melted material are also identified.

Sikka, V.K. [Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

1994-12-31T23:59:59.000Z

211

Mechanical properties of welds in commercial alloys for high-temperature gas-cooled reactor components  

SciTech Connect (OSTI)

Weld properties of Hastelloy-X, Incoloy alloy 800H (with and without Inconel-82 cladding), and 2 1/4 Cr-1 Mo are being studied to provide design data to support the development of steam generator, core auxiliary heat exchanger, and metallic thermal barrier components of the high-temperature gas-cooled reactor (HTGR) steam cycle/cogeneration plant. Tests performed include elevated-temperature creep rupture tests and tensile tests. So far, data from the literature and from relatively short-term tests at GA Technologies Inc. indicate that the weldments are satisfactory for HTGR application.

Lindgren, J.R.; Li, C.C.; Ryder, R.H.; Thurgood, B.E.

1984-07-01T23:59:59.000Z

212

Mechanical Properties of Bulk Nanocrystalline Austenitic Stainless Steels Produced by Equal Channel Angular Pressing  

E-Print Network [OSTI]

304L 2B300 and 316L 2B300 billets via electron discharge machining (EDM) and were further sectioned with a Buehler Isomet 1000 diamond wafer saw. The result was a small, rectangular plate that was then mounted in an acrylic mold with the surface... significant reduction in initial cross section dimensions as a result of the mechanisms invoked in each of these processes and, consequently, lead to a strong stress- strain non-uniformity of the material. To facilitate these processes, powerful machines...

Gonzalez, Jeremy

2012-10-19T23:59:59.000Z

213

Mechanical properties of crystalline solids. Progress report, December 1, 1979-November 30, 1980  

SciTech Connect (OSTI)

The work performed during the past fiscal year included in the materials area: the development of microstructural basis for a second generation state variable deformation model; the continuation of the work on a unified model for grain boundary anelasticity and grain boundary sliding; the continued investigation of the grain boundary cavitation process in the Zircaloys; and the application of a state variable approach in materials characterization. In the mechanics area: a finite element analysis of thermal stress transients in structures; and the application of the boundary element method to plate bending and fracture. Type 316 stainless steel, Nickel 270, and Zircaloy-2 and -4 were the materials used. 35 figures.

Li, C Y; Mukherjee, S; Hart, E W

1980-09-01T23:59:59.000Z

214

Experimental investigation on mechanical properties of a fiber-reinforced silica aerogel composite  

Science Journals Connector (OSTI)

Aerogel has been used for thermal insulation because of its extremely low thermal conductivity, but the application has been restricted to non-loading-bearing structures by its low strength properties. Fiber-reinforced aerogel was prepared with higher strength but without sacrificing much of its thermal conductivity. While fiber-reinforced aerogel performs as load-bearing insulation, two behaviors must be investigated: compression and stress relaxation at evaluated temperature. At first, compression test was performed on a fiber-reinforced aerogel composite at both room and evaluated temperature, then the effects of temperature on compression properties of the fiber-reinforced aerogel were analyzed. Stress Relaxation Test was carried out at a constant strain of 0.1 for 1200s at both room and evaluated temperature. The experimental results show that the stress relaxations increase with the temperature rise from 200C to 800C. Previous research and Scanning Electron Microscope (SEM) analysis of specimens showed that two time-dependent behaviors: (1) cracks induced by collapse of the pores, and (2) fiber failures subject to interfaces that debond and slide, might be possible reasons for the stress relaxation and the small inelastic strain of specimen tested at 25C. While three time dependent phenomena: (1) fusing of aerogel nanoparticles to form nanoparticle clusters, (2) fiber stress relaxation and (3) fiber failures subject to interfaces that debond and slide, would be possible reasons for the remarkable stress relaxation behavior at 800C.

Xiaoguang Yang; Yantao Sun; Duoqi Shi; Jinlong Liu

2011-01-01T23:59:59.000Z

215

Evaluation of microstructure and mechanical properties in friction stir processed SKD61 tool steel  

SciTech Connect (OSTI)

A SKD61 tool steel was friction stir processed using a polycrystalline cubic boron nitride tool. Microstructure, tensile properties and wear characteristic were evaluated. Fine grains with a martensite structure were produced in the friction stir processed zone, which led to the increase of the microindentation hardness. The grains became finer when the heat input was lowered. The transverse tensile strength of the friction stir processed zone was equal to that of base metal and all the tensile specimens fractured at base metal zone. The wear width and depth of the friction stir processed zone at the load of 1.96 N were 339 {mu}m and 6 {mu}m, as compared to 888 {mu}m and 42 {mu}m of the base metal, decreased by 62% and 86%. Findings of the present study suggest that low heat input is an effective method to produce a friction stir processed zone composed of relatively fine grain martensitic structure with good tensile properties and wear characteristic.

Chen, Y.C., E-mail: armstrong@hit.edu.cn [Joining and Welding Research Institute, Osaka University, Osaka 567-0047 (Japan); Nakata, K. [Joining and Welding Research Institute, Osaka University, Osaka 567-0047 (Japan)

2009-12-15T23:59:59.000Z

216

Mechanical properties and modeling of seal-forming lithologies. Technical progress report No. 3, March 15, 1992--June 14, 1993  

SciTech Connect (OSTI)

Specific goals and accomplishments of this research include: (1) The evaluation of models of salt diaper ascent that involve either power law, dislocation creep as determined experimentally by Horseman et al. (1993) or linear, fluid-assisted creep as reported by Spiers et al. (1988, 1990, 1992). We have compared models assuming these two, experimentally evaluated flow laws and examined the predictions they make regarding diaper incubation periods, ascent velocities, deviatoric stresses and strain rates. (2) The evaluation of the effects of differential loading on the initiation an of salt structures. (3) Examination of the role of basement faults on the initiation and morphologic evolution of salt structures. (4) Evaluation of the mechanical properties of shale as a function of pressure and determination of the nature of its brittle-ductile transition. (5) Evaluation of the mechanical anisotropies of shales with varying concentrations, distributions and preferred orientations of clay. (6) The determination of temperature and ratedependencies of strength for a shale constitutive model that can be used in numerical models that depend on viscous formulations. (7) Determination of the mechanisms of deformation for argillaceous rocks over awide range of conditions. (8) Evaluation of the effects of H{sub 2}O within clay interlayers, as adsorbed surface layers.

Kronenberg, A.K.; Russell, J.E.; Carter, N.L.; Mazariegos, R.; Ibanez, W.

1993-06-01T23:59:59.000Z

217

Ab initio study on the electronic and mechanical properties of ReB and ReC  

SciTech Connect (OSTI)

The structural, electronic, and mechanical properties of ReB and ReC have been studied by use of the density functional theory. For each compound, six structures are considered, i.e., hexagonal WC, NiAs, wurtzite, cubic NaCl, CsCl, and zinc-blende type structures. The results indicate that for ReB and ReC, WC type structure is energetically the most stable among the considered structures, followed by NiAs type structure. ReB-WC (i.e., ReB in WC type structure) and ReB-NiAs are both thermodynamically and mechanically stable. ReC-WC and ReC-NiAs are mechanically stable and becomes thermodynamically stable above 35 and 55 GPa, respectively. The estimated hardness from shear modulus is 34 GPa for ReB-WC, 28 GPa for ReB-NiAs, 35 GPa for ReC-WC and 37 GPa for ReC-NiAs, indicating that they are potential candidates to be ultra-incompressible and hard materials. - Graphical Abstract: The enthalpy-pressure diagram for ReC from the selected structures. ReC-WC and ReC-NiAs become thermodynamically stable above 35 and 55 GPa, respectively. ReC-WC is the most stable phase.

Zhao Erjun [State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China); Graduate School, Chinese Academy of Sciences, Beijing 100049 (China); Wang Jinping [Department of Applied Chemistry, Qingdao Agricultural University, Qingdao 266109 (China); Meng Jian [State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China); Wu Zhijian, E-mail: zjwu@ciac.jl.c [State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China)

2009-04-15T23:59:59.000Z

218

Mechanical properties and dimensional stability of organo-nanoclay modified biofiber polymer composites  

Science Journals Connector (OSTI)

In this study, hydrophobic Kraft fibers were obtained by organo-nanoclay modification. The treated fibers were used as reinforcements for improving mechanical performance and dimensional stability of high density polyethylene (HDPE) composites. After the organo-nanoclay treatment, Kraft fibers had a more uniform dispersion in the HDPE matrix and the resulting composites had a higher Youngs modulus and thermal stability than the composites containing untreated fibers. The addition of 5wt% of maleic anhydride polyethylene (MAPE) compatibilizer improved fiber and matrix adhesion and resulted in increased tensile strength and Youngs modulus as well as thermal stability of both treated and untreated fiber composites. However, this improvement was more significant for the composites with the treated fibers. In addition, water absorption of the organo-nanoclay treated Kraft fiberHDPE composites decreased after adding the compatibilizer.

Jieming Chen; Ning Yan

2013-01-01T23:59:59.000Z

219

Laboratory Characterization of Mechanical and Permeability Properties of Dynamically Compacted Crushed Salt  

SciTech Connect (OSTI)

The U. S. Department of Energy plans to dispose of transuranic wastes at the Waste Isolation Pilot Plant (WIPP), a geologic repository located at a depth of about 655 meters. The WIPP underground facility is located in the bedded salt of the Salado Formation. Access to the facility is provided through vertical shafts, which will be sealed after decommissioning to limit the release of hazardous waste from the repository and to limit flow into the facility. Because limited data are available to characterize the properties of dynamically compacted crushed salt, Sandia National Laboratories authorized RE/SPEC to perform additional tests on specimens of dynamically compacted crushed salt. These included shear consolidation creep, permeability, and constant strain-rate triaxial compression tests. A limited number of samples obtained from the large compacted mass were available for use in the testing program. Thus, additional tests were performed on samples that were prepared on a smaller scale device in the RE/SPEC laboratory using a dynamic-compaction procedure based on the full-scale construction technique. The laboratory results were expected to (1) illuminate the phenomenology of crushed-salt deformation behavior and (2) add test results to a small preexisting database for purposes of estimating parameters in a crushed-salt constitutive model. The candidate constitutive model for dynamically compacted crushed salt was refined in parallel with this laboratory testing.

Hansen, F.D.; Mellegard, K.D.; Pfeifle, T.W.

1999-02-01T23:59:59.000Z

220

Effect of hydrogen contents on the mechanical properties of Zircaloy-4  

Science Journals Connector (OSTI)

Zircaloy-4 plate specimens were gaseously hydrided up to 340 ppm H and then tested at 25, 100, 200 and 300C. Notched tensile specimens were chosen to better understand the ductile-brittle transition associated with hydrogen content. The results showed that, at 25C, a ductile-brittle transition occurred on the notched specimens of zircaloy-4 with hydrogen contents between 30 ppm and 140 ppm. The ductile-brittle transition became less distinct as temperature increased to 100C and above. This was attributed to the improved ductility of the zirconium matrix by examining the temperature dependence of fracture surface and hydride morphology. Load serrations were observed on the hydrided, notched specimens tested at 200C and above, which was related to dynamic strain aging. The stress-strain curves exhibited yield points on the specimens without hydriding. The yield points were suppressed on the hydrided specimens, which was explained by the mechanism that twinning-assisted slip may be hindered by hydrides.

J.-H. Huang; S.-P. Huang

1994-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Hydride precipitation and its influence on mechanical properties of notched and unnotched Zircaloy-4 plates  

Science Journals Connector (OSTI)

The hydride formation and its influence on the mechanical performance of hydrided Zircaloy-4 plates containing different hydrogen contents were studied at room temperature. For the unnotched plate samples with the hydrogen contents ranging from 25 to 850wt.ppm, the hydrides exerted an insignificant effect on the tensile strength, while the ductility was severely degraded with increasing hydrogen content. The fracture mode and degree of embrittlement were strongly related to the hydrogen content. When the hydrogen content reached a level of 850wt.ppm, the plate exhibited negligible ductility, resulting in almost completely brittle behavior. For the hydrided notched plate, the tensile stress concentration associated with the notch tip facilitated the hydride accumulation at the region near the notch tip and the premature crack propagation through the hydride fracture during hydriding. The final brittle through-thickness failure for this notched sample was mainly attributed to the formation of a continuous hydride network on the thickness section and the obtained very high hydrogen concentration (estimated to be 1965wt.ppm).

Zhiyang Wang; Ulf Garbe; Huijun Li; Robert P. Harrison; Karl Toppler; Andrew J. Studer; Tim Palmer; Guillaume Planchenault

2013-01-01T23:59:59.000Z

222

Characterization of mechanical properties of a hollow cylinder with zero group velocity Lamb modes  

Science Journals Connector (OSTI)

Hollow cylinders used in the industry must be regularly inspected. Elasticguided waves similar to Lamb modes in a plate can propagate in the axial direction or around the circumference. They are sensitive to geometrical and mechanical parameters of the cylindrical shell. The objective of this paper is to show that zero group velocity (ZGV) Lamb modes can be used to bring out anisotropy and to measureelastic constants of the material. This study provides experimental and numerical investigations on a Zirconium alloy tube extensively used by the nuclear industry in reactor core components. A non-contact method based on laser ultrasound techniques and ZGV Lamb modes demonstrates that the difference observed between axial and circumferential guided waves cannot be explained by an isotropic model. Then a transverse isotropic model is used for the Zircaloy tube. Four of the five elastic constants are directly extracted from ZGV resonance frequencies. The last one is deduced from the measureddispersion spectra. With this complete set of constants a good agreement is obtained between theoretical and experimental dispersion curves for both axially and circumferentially propagating guided waves.

M. Cs; D. Royer; C. Prada

2012-01-01T23:59:59.000Z

223

Influence of strontium addition on the mechanical properties of gravity cast Mg-3Al-3Sn alloy  

SciTech Connect (OSTI)

In this study, the effect of strontium (0.01, 0.1, 0.5, 1 wt%) addition on the microstructure and mechanical properties of the gravity cast Mg-3Al-3Sn alloy were investigated. X-ray diffractometry revealed that the main phases are ??Mg, ??Mg{sub 17}Al{sub 12} and Mg{sub 2}Sn in the Mg-3Al-3Sn alloy. With addition The tensile testing results showed that the yield and ultimate tensile strength and elongation of Mg-3Al-3Sn alloy increased by adding Sr up to 0.1 wt.% and then is gradually decreased with the addition of more alloying element.

Germen, Gl?ah, E-mail: gulsahgermen@hotmail.com; ?evik, Hseyin, E-mail: gulsahgermen@hotmail.com [Mersin University, Faculty of Engineering, Department of Metallurgical and Materials Engineering, Mersin, 33343 (Turkey); Kurnaz, S. Can [Sakarya University, Faculty of Engineering, Department of Metallurgical and Materials Engineering, Adapazar, 54187 (Turkey)

2013-12-16T23:59:59.000Z

224

Experimental and numerical determination of mechanical properties of polygonal wood particles and their flow analysis in silos  

E-Print Network [OSTI]

Responding to a lack in the literature, mechanical properties of polygonal wood particles are determined for use in a discrete element model (DEM) for flow analysis in silos, and some methods are proposed for determining such parameters. The parameters arrived at here have also formed part of the input to the SPOLY software, developed in-house to compute the DEM model with spheropolyhedron elements. The model is validated using a 2D physical model, where prismatic particles with polygonal cross sections are placed inside a silo with variable aperture and hopper angle. Validation includes comparison of flow-rates computed by SPOLY, displacement profiles, and clogging thresholds with experimental results. The good agreement that emerges will encourage future use of miniature triaxial tests, grain-surface profilometry, inclined slope tests, and numerical analysis of the intragranular stresses - toward a direct construction of the contact-deformation relations required in realistic DEM modelling of particle flow with angular-shaped particles.

Fernando Alonso-Marroqun; lvaro Ramrez-Gmez; Carlos Gonzlez-Montellano; Nigel Balaam; Dorian A. H. Hanaor; E. A. Flores-Johnson; Yixiang Gan; Shumiao Chen; Luming Shen

2014-05-13T23:59:59.000Z

225

A stable, quasi-2D modification of silver: optical, electronic, vibrational and mechanical properties, and first principlescalculations  

Science Journals Connector (OSTI)

We report the optical, electronic, vibrational and mechanical properties of a stable, anisotropic, hexagonal (4H) form of silver. First principles calculations based on density functional theory were used to simulate the phonon dispersion curves and electronic band structure of 4H-Ag. The phonon dispersion data at 0K do not contain unstable phonon modes, thereby confirming that it is a locally stable structure. The Fermi surface of the 4H phase differs in a subtle way from that of the cubic phase. Experimental measurements indicate that, when compared to the commonly known face-centered cubic (3C) form of silver, the 4H-Ag form shows a 130-fold higher, strongly anisotropic, in-plane resistivity and a much lower optical reflectance with a pronounced surface plasmon contribution that imparts a distinctive golden hue to the material. Unlike common silver, the lower symmetry of the 4H-Ag structure allows it to be Raman active. Mechanically, 4H-Ag is harder, more brittle and less malleable. Overall, this novel, poorly metallic, anisotropic, darker and harder crystallographic modification of silver bears little resemblance to its conventional counterpart.

Indrani Chakraborty; Sharmila N Shirodkar; Smita Gohil; Umesh V Waghmare; Pushan Ayyub

2014-01-01T23:59:59.000Z

226

Mechanism-based constitutive modeling of L1? single-crystal plasticity  

E-Print Network [OSTI]

Ni3Al, an L12 structure intermetallic crystal, is the basic composition of the [gamma]' precipitates in nickel-based superalloys and is a major strengthening mechanism contributing to the superalloys' outstanding ...

Yin, Yuan, 1977-

2006-01-01T23:59:59.000Z

227

Property  

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

7 7 AUDIT REPORT PERSONAL PROPERTY AT THE OAK RIDGE OPERATIONS OFFICE AND THE OFFICE OF SCIENTIFIC AND TECHNICAL INFORMATION U.S. DEPARTMENT OF ENERGY OFFICE OF INSPECTOR GENERAL OFFICE OF AUDIT SERVICES APRIL 1998 Page 10 DEPARTMENT OF ENERGY Washington, DC 20585 April 6, 1998 MEMORANDUM FOR THE MANAGER, OAK RIDGE OPERATIONS OFFICE AND THE DIRECTOR, OFFICE OF SCIENTIFIC AND TECHNICAL INFORMATION FROM: Terry L. Brendlinger Eastern Regional Audit Office Office of Inspector General SUBJECT: INFORMATION: Audit Report on "Personal Property at the Oak Ridge Operations Office and the Office of Scientific and Technical Information" BACKGROUND The Oak Ridge Operations Office (Operations Office) and the Office of Scientific and Technical Information

228

Microstructures and mechanical properties of Ti-6Al-4V welds with filler additions of tantalum and FS85  

SciTech Connect (OSTI)

Many applications in the nuclear industry require that titanium alloys be welded to refractory metal alloys. Because of the widely dissimilar properties of these materials, the homogeneity of the fusion zone os of particular concern. To address this issue, a study was conducted to characterize the fusion zones of Ti-6Al-4V welds made with filler additions of tantalum and FS85 (Nb-28Wt%Ta-10wt%W-1wt%Zr). A goal of this study was to evaluate the feasibility of making microstructural predictions based on calculated fusion zone electron/atom (e/a) ratios. The welds were made by placing tantalum or FS85 shims between two pieces of 2.5 mm (0.1 in.) thick Ti-6Al-4V and making an electron beam weld along the length of the shim. With complete mixing, these shims were expected to produce fusion zone e/a ratios of 3.63{emdash}4.14 for the Ta series and 3.63{emdash}4.06 for the FS85 series, and microstructures consisting of {alpha}`, {alpha}`, and perhaps {omega}. The weld macro- and microstructures were characterized using optical and electron microscopy, energy-dispersive spectroscopy, and x-ray diffraction. The mechanical properties of the welds were assessed using transverse and all-weld-metal tensile tests. The results showed a general increase in strength and decrease in ductility with increasing {beta} stabilizer level. As a result of this study, parameters were developed to increase the fusion zone size and increase mixing of the components. This work was performed at Sandia National Laboratories, supported by the U.S. Department of Energy under contract number DE-AC04-76DR00789, and at Los Alamos National Laboratory under contract number W-7405-ENG-36.

Damkroger, B.K.; Dixon, R.D.; Cotton, J.D.

1994-12-31T23:59:59.000Z

229

Effect of Si interlayers on the magnetic and mechanical properties of Fe/Ge neutron polarizing multilayer mirrors  

SciTech Connect (OSTI)

The neutron polarizing supermirror is one of the most important optical devices for polarizing neutron beams. To meet a variety of research demands, neutron polarizing supermirrors need to display high polarization efficiencies at low external magnetic fields. Fe/Si and Fe/Ge multilayers are typically used in neutron polarizing supermirrors because the contrast in scattering length densities almost vanishes for spin-down neutrons. The Fe/Si/Ge/Si multilayer, obtained by adding thin interlayers of Si to an Fe/Ge multilayer, is effective in reducing the external field strength necessary to achieve efficient neutron polarization. To gain insight into the mechanism that controls the required external field strength for a neutron polarizing supermirror, we investigated the magnetic and mechanical properties of Fe/Si, Fe/Ge, and Fe/Si/Ge/Si multilayers. The external field strength required to achieve efficient neutron polarization was found to be proportional to the compressive film stress. The compressive stress of the Fe/Si/Ge/Si multilayer was smaller by a factor of 4.4 and 2.7 than that of Fe/Si and Fe/Ge multilayers, respectively. These measurements and analyses showed that a reduction in the compressive film stress in the Fe/Si/Ge/Si multilayer permits the use of lower external field strength to achieve efficient neutron polarization. X-ray photoelectron spectroscopic studies showed that the formation of a Ge-Si solid solution in the Ge layer may explain the marked reduction in compressive stress in the case of the Fe/Si/Ge/Si multilayer. This study confirmed that a reduction in compressive film stress is very important for a high-performance neutron polarizing supermirror.

Maruyama, R.; Yamazaki, D.; Hayashida, H.; Soyama, K. [J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan); Okayasu, S. [Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan); Takeda, M. [J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan); Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan); Zettsu, N.; Nagano, M.; Yamamura, K. [Research Center for Ultra-precision Science and Technology, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871 (Japan)

2012-03-15T23:59:59.000Z

230

Mechanical deformation of neutrophil into pulmonary capillaries induces cytoskeletal remodeling, pseudopod projection and changes in biomechanical properties  

E-Print Network [OSTI]

Neutrophils traversing the pulmonary microcirculation are subjected to mechanical stimulation during their deformation into narrow capillaries. To better understand the time- dependant changes caused by this mechanical ...

Yap, Belinda

2005-01-01T23:59:59.000Z

231

Experimental and numerical investigations on tailored tempering process of a U-channel component with tailored mechanical properties  

SciTech Connect (OSTI)

Hot stamping of quenchenable ultra high strength steels currently represents a promising forming technology for the manufacturing of safety and crash relevant parts. For some applications, such as B-pillars and other structural components that may undergo impact loading, it may be desirable to create regions of the part with tailored mechanical properties. In the paper, a laboratory-scale hot stamped U-channel was manufactured by using a segmented die, which was heated by cartridge heaters and cooled by water channels independently. Local hardness values as low as 289 HV can be achieved using a heated die temperature of 400C while maintaining a hardness level of 490 HV in the fully cooled region. If the die temperature was increased to 450C, the Vickers hardness of elements in the heated region was 227 HV, with a reduction in hardness of more than 50%. Optical microscopy was used to verify the microstructure of the as-quenched phases with respect to the heated die temperatures. The FE model of the lab-scale process was developed to capture the overall hardness trends that were observed in the experiments.

Tang, B. T., E-mail: tbtsh@hotmail.com [Shandong Jianzhu University, Fengming Rd., Jinan, 250101 (China); Bruschi, S.; Ghiotti, A.; Bariani, P. F. [University of Padova, Via Venezia 1, Padova, 35131 (Italy)

2013-12-16T23:59:59.000Z

232

Microstructure and mechanical properties of diffusion bonded W/steel joint using V/Ni composite interlayer  

SciTech Connect (OSTI)

Diffusion bonding between W and steel using V/Ni composite interlayer was carried out in vacuum at 1050 C and 10 MPa for 1 h. The microstructural examination and mechanical property evaluation of the joints show that the bonding of W to steel was successful. No intermetallic compound was observed at the steel/Ni and V/W interfaces for the joints bonded. The electron probe microanalysis and X-ray diffraction analysis revealed that Ni{sub 3}V, Ni{sub 2}V, Ni{sub 2}V{sub 3} and NiV{sub 3} were formed at the Ni/V interface. The tensile strength of about 362 MPa was obtained for as-bonded W/steel joint and the failure occurred at W near the V/W interface. The nano-indentation test across the joining interfaces demonstrated the effect of solid solution strengthening and intermetallic compound formation in the diffusion zone. - Highlights: Diffusion bonding of W to steel was realized using V/Ni composite interlayer. The interfacial microstructure of the joint was clarified. Several VNi intermetallic compounds were formed in the interface region. The application of V/Ni composite interlayer improved the joining quality.

Liu, W.S.; Cai, Q.S., E-mail: cai2009pm@163.com; Ma, Y.Z.; Wang, Y.Y.; Liu, H.Y.; Li, D.X.

2013-12-15T23:59:59.000Z

233

The influence of laser welding parameters on the microstructure and mechanical property of the as-jointed NiTi alloy wires  

E-Print Network [OSTI]

The influence of laser welding parameters on the microstructure and mechanical property of the as September 2007; accepted 27 November 2007 Available online 4 December 2007 Abstract The Nd:YAG laser welding width and welding current. The aim was to assess the influence of the laser-welding process

Zheng, Yufeng

234

Response to Comment on Solid Recovered Fuel: Materials Flow Analysis and Fuel Property Development during the Mechanical Processing of Biodried Waste  

Science Journals Connector (OSTI)

Response to Comment on Solid Recovered Fuel: Materials Flow Analysis and Fuel Property Development during the Mechanical Processing of Biodried Waste ... treatment-derived SRF quality, informing the development of realistic SRF quality specifications, through modeling exercises, needed for effective thermal recovery. ... Velis, C. A.; Cooper, J.Are solid recovered fuels resource-efficient? ...

Costas A. Velis; Stuart Wagland; Phil Longhurst; Bryce Robson; Keith Sinfield; Stephen Wise; Simon Pollard

2013-12-05T23:59:59.000Z

235

A novel procedure employing laser ultrasound technique and simplex algorism for the characterization of mechanical and geometrical properties in Zircaloy tubes with different levels of hydrogen charging  

Science Journals Connector (OSTI)

In this research, a procedure employing a laser ultrasound technique (LUT) and an inversion algorism is reported for nondestructive characterization of mechanical and geometrical properties in Zircaloy tubes with different levels of hydrogen charging. With the LUT, guided acoustic waves are generated to propagate in the Zircaloy tubes and are detected remotely by optical means. By measuring the dispersive wavespeeds followed by the inversion algorism, mechanical properties such as elastic moduli and geometrical property such as wall-thickness of Zircaloy tubes are characterized for different levels of hydrogen charging. Having the advantages of remote, non-contact and point-wise generation/detection, the reported procedure serves as a competitive candidate for the characterization of Zircaloy tubes generally operated in irradiative and temperature-elevated environments.

I-Hung Liu; Che-Hua Yang

2011-01-01T23:59:59.000Z

236

Mechanical and Aerospace Engineering  

E-Print Network [OSTI]

Mechanical and Aerospace Engineering seminar Three Dimensional Traction Force Microscopy with Applications in Cell Mechanics abstract The interactions between biochemical and mechanical signals during-dimensional measurement techniques are needed to investigate the effect of mechanical properties of the substrate

237

Mechanical and charge transport properties of alkanethiol self-assembled monolayers on Au (111) surface: The Role of Molecular Tilt  

E-Print Network [OSTI]

electronic properties of molecules and the influence of external forces is fundamentalelectronic devices is potentially promising for technological applications and an important focus of fundamental

Qi, Yabing

2007-01-01T23:59:59.000Z

238

The Role of Friction Stir Welding on the Microstructure and Mechanical Properties of AZ31B-H24 Mg alloy  

SciTech Connect (OSTI)

In this study, an attempt was made to join AZ31B magnesium alloy by friction stir welding (FSW) process. A single tool with cylindrical screw threaded pin was used to investigate the effect of welding parameters on microstructure and mechanical properties of stir zone (SZ). Several welds were made at different rotational ({omega}) and traverse ({upsilon}) speeds, while the {omega}/{upsilon} ratios were kept constant. The optical and scanning electron microscopy were used to study the variation of microstructure across the welds. Moreover, micro-hardness and tensile tests were carried out to evaluate the mechanical properties of joints. It was found that {omega} plays more significant role on the resulted grain structure than {upsilon}, and at a constant {omega}/{upsilon} ratio, decreasing rotational speed decreased the size of grains, and hence, improved the hardness value and the tensile strength of the SZ.

Darzi, Kh.; Saeid, T. [Advanced Materials Research Center - Faculty of Materials Engineering, Sahand University of Technology - Tabriz (Iran, Islamic Republic of)

2011-12-26T23:59:59.000Z

239

PHILOSOPHY HONORS NOMINATION FORM The Philosophy Department offers an honors program for outstanding students in the major. Majors who have a 3.7 GPA in  

E-Print Network [OSTI]

PHILOSOPHY HONORS NOMINATION FORM The Philosophy Department offers an honors program for outstanding students in the major. Majors who have a 3.7 GPA in philosophy (3.25 overall) at the end if philosophy honors are to be awarded. Honors students are expected to maintain an average of 3.7 or better

240

Effect of composite microstructure on electrical and mechanical properties of poly(vinyl acetate) composites with carbon black and clay.  

E-Print Network [OSTI]

The electrical and mechanical behavior of carbon black filled poly(vinyl acetate) latex-based and solution-based polymer composites was examined. A set of experiments were performed to distinguish composites with a segregated network (emulsion...

Miriyala, Sethu M.

2009-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Effect of treatment time on characterization and properties of nanocrystalline surface layer in copper induced by surface mechanical attrition treatment  

Science Journals Connector (OSTI)

Nanocrystalline surface layers were synthesized on pure copper by means of surface mechanical attrition treatment (SMAT) at various treatment times. The microstructural features of the surface layers produced by ...

Farzad Kargar; M. Laleh; T. Shahrabi; A. Sabour Rouhaghdam

2014-08-01T23:59:59.000Z

242

Methods of Experimental Physics. vol. 6, Solid State Physics. Part A: Preparation, structure, mechanical and thermal properties. xvi + 466 pp. $11.80. Part B: Electrical, magnetic, and optical properties. xiv + 416 pp. $11. K. Lark-Horovitz and Vivian A. Johnston, Eds. Academic Press, New York, 1959. Illus  

Science Journals Connector (OSTI)

...structure, mechanical and thermal properties. xvi + 466 pp...struCture, mechanical and thermal properties. xvi + 466 pp...the kingdoms of the western Sudan is quite extensive, and A...adequate account of the eastern Sudan, but Davidson adds an interesting...

Richard J. Weiss

1960-02-19T23:59:59.000Z

243

Size Effect of SiC Particle on Microstructures and Mechanical Properties of SiCp/Al Composites  

E-Print Network [OSTI]

matrix composites reinforced with ceramic particles have some attractive properties such as high strengthCp/Al composites were fabricated using aluminum alloy ZL101 as the matrix material, and SiC particles a composite is stretched, most of external load transfers from soft Al matrix to hard SiCp reinforcement

Qin, Qinghua

244

Thermal and mechanical properties of polyurethane foams and a survey of insulating concretes at cryogenic temperatures. Final report, January 1979-February 1984  

SciTech Connect (OSTI)

Thermal and mechanical properties of expanded plastics, foams, are reported. The system studied was rigid, closed cell, CCl/sub 3/F blown, polyether based polyurethane. The primary temperature range of study was 100 to 300 K; however, several properties were determined to 4 K. The nominal densities of the foams tested were 32, 64, and 96 kg/cu m. Properties reported are thermal conductivity, thermal expansion, strength and moduli in tension and in compression, proportional limit, yield strength, ultimate strength, and shear strength. Physical properties were determined both parallel and perpendicular to the orthogonal axes of the bulk supplies. The gas content of the specimens was determined using a gas chromatograph-mass spectrometer and with a gas displacement pycnometer. Empirical procedures for estimating the temperature dependent thermophysical properties were developed. These procedures are based on the experimental data and utilize the characterization parameters for molar gas concentration, gas pressure, and cell morphology. Regulations affecting vapor dispersion in the area around liquefied natural gas facilities make it attractive to construct dikes and impounding areas out of materials having low thermal conductivities. Several insulating concretes have the general properties required for such applications. Screening tests were done to determine the thermal conductivity, modulus of rupture, and the compressive strength of several polyester based materials with glass bead or perlite aggregate and of portland cement based materials with vermiculite or polystyrene aggregate. A bibliography resulting from an extensive literature survey of lightweight concretes is presented. Seven of the references which were particularly applicable are presented in annotated form.

Sparks, L.L.; Arvidson, J.M.

1984-04-01T23:59:59.000Z

245

Effects of Post-Weld Heat Treatment on the Mechanical Properties of Similar- and Dissimilar-Alloy Friction Stir Welded Blanks  

SciTech Connect (OSTI)

Friction stir welding is a solid state joining process with relatively low welding temperatures. Nevertheless, the mechanical properties of friction stir welded blanks are degraded after welding. Indeed, both strength and ductility of the welds are decreased after welding. Often, the resulting friction stir welded blanks need to be formed to their final structural shape. Therefore, the formability of friction stir welded blanks is of primary importance in the manufacturing of structural parts. This paper studies how the mechanical properties and particularly formability of friction stir welded blanks can be improved by applying a post weld heat treatment. Two aluminum alloys from 2000 and 7000 series, namely 2024-T3 and 7075-T6, are selected for the study. The sheet thickness of both materials is 2,0 mm. The selected alloys are welded in three configurations: 2024-T3 and 2024-T3, 7075-T6 and 7075-T6, and 2024-T3 and 7075-T6. The resulting welds are naturally aged for a few months. Three sets of standard dog bone shape tensile test specimens are then machined from the welds. The first set of the specimens is tested without any heat treatment. The second set of the specimens is solution heat treated and quenched before testing. The third set of the specimens is solution heat treated, quenched, and naturally aged for a week before testing. The mechanical properties of the three different sets of specimens are compared with each other. It is shown that careful selection of post weld heat-treatment can greatly improve the formability of friction stir welded blanks.

Zadpoor, Amir Abbas [Materials Innovation Institute (M2i), Mekelweg 2, Delft 2628CD (Netherlands); Faculty of Aerospace Engineering, Delft University of Technology (TU Delft), Mekelweg 2, Delft 2629HS (Netherlands); Sinke, Jos [Faculty of Aerospace Engineering, Delft University of Technology (TU Delft), Mekelweg 2, Delft 2629HS (Netherlands)

2011-01-17T23:59:59.000Z

246

First Principles Study on the Electrochemical, Thermal and Mechanical Properties of LiCoO2 for Thin Film Rechargeable Battery  

Science Journals Connector (OSTI)

Abstract Thin film rechargeable battery has become a research hotspot because of its small size and high energy density. Lithium cobalt oxide as a typical cathode material in classical lithium ion batteries is also widely used in thin film rechargeable batteries. In this work, the electrochemical, mechanical and thermal properties of LiCoO2 were systematically investigated using the first principles method. Elastic constants under hydrostatic pressures between 0 to 40GPa were computed. Specific heat and Debye temperature at low temperature were discussed. Thermal conductivity was obtained using the imposed-flux method. The results show good agreements with experimental data and computational results in literature.

Linmin Wu; Weng Hoh Lee; Jing Zhang

2014-01-01T23:59:59.000Z

247

Improvement in the Mechanical Properties of B-Staged Carbon Nanotube/Epoxy Based Thin Film Systems  

E-Print Network [OSTI]

]. The basic method of characterization of the CNTs is by the number of these concentric shells. Single-walled carbon nanotubes (SWCNTs) are made up of one shell of graphene rolled along a chiral vector. Multi-walled (MWCNT) carbon nanotubes are made... filler material to a matrix material is alignment. Tremendous research efforts have sought to utilize the magnetic and electrical properties of carbon nanotubes in order to orient them to create conductive pathways. The most common methods have...

White, Kevin

2011-01-11T23:59:59.000Z

248

Effect of CeO{sub 2} addition on the properties of FeAl based alloy produced by mechanical alloying technique  

SciTech Connect (OSTI)

Iron aluminides based on FeAl is notable for their low materials cost, ease of fabrication and good corrosion, suffixation and oxidation resistance. However, the application based on these unique properties still require the development of Fe-Al based alloy since it shows some drawbacks such as a lack of high temperature strength and low ductility. To improve the mechanical properties of FeAl based alloy, ceria (CeO{sub 2}) will be added to this compound. FeAl based alloy produced by the mechanical alloying (MA) technique. The developed specimens then assessed with respect to oxidation behaviour in high temperature, scale microstructure and hardness. The surface morphologies of the alloy evaluated and observed using scanning electron microscopy (SEM) with an energy dispersive X-ray spectroscopy (EDX). The phase structures of oxide scale formed on them were identified by X-ray diffraction (XRD). The results found that the FeAl intermetallic compound containing CeO{sub 2} 0.5 wt.% is less pores and CeO{sub 2} 1.0 wt.% is more homogen in powder and solid form, higher hardness and increase in their resistance to oxidation behaviour in high temperature compared with another percentage of CeO{sub 2}.

Khaerudini, Deni S.; Muljadi,; Sardjono, P.; Tetuko, Anggito P.; Sebayang, P.; Ginting, M. [Research Center for Physics, Indonesian Institute of Sciences (LIPI) Gd. 440, Kawasan Puspiptek Serpong Tangerang 15314 Banten (Indonesia)] [Research Center for Physics, Indonesian Institute of Sciences (LIPI) Gd. 440, Kawasan Puspiptek Serpong Tangerang 15314 Banten (Indonesia)

2013-09-03T23:59:59.000Z

249

Investigating the morphological, mechanical and degradation properties of scaffolds comprising collagen, gelatin and elastin for use in soft tissue engineering  

E-Print Network [OSTI]

, collagen with or without () elastin were swollen in 0.05 M acetic acid at 4 2C overnight to produce a 1% (w/v) protein suspension. The resulting suspension was homogenised on ice for 10 min at 9,500 rpm using an Ultra-Turrax VD125 (VWR International... the optimal physical properties and microenvironment for cells. Various different materials have been used to produce scaffolds for cardiac tissue engineering; collagen type I (van Luyn et al. 2002; Zimmermann et al. 2002), collagen and glycosaminoglycans...

Grover, CN; Best, Serena Michelle; Cameron, Ruth Elizabeth

2012-07-09T23:59:59.000Z

250

European Photovoltaic Solar Energy Conference, Valencia, Spain, 6-10 September 2010, 4AV.3.115 NON-LINEAR MECHANICAL PROPERTIES OF ETHYLENE-VINYL ACETATE (EVA) AND ITS  

E-Print Network [OSTI]

.115 1 NON-LINEAR MECHANICAL PROPERTIES OF ETHYLENE-VINYL ACETATE (EVA) AND ITS RELEVANCE ABSTRACT: Polymers such as ethylene-vinyl acetate (EVA) encapsulants are known for their non for PV modules is ethylene-vinyl acetate (EVA). It is thus essential for mechanical module and lamination

251

Properties of few-body systems in relativistic quantum mechanics and constraints from transformations under Poincar space-time translations  

E-Print Network [OSTI]

Different approaches have been applied to the calculation of form factors of various hadronic systems within relativistic quantum mechanics. In a one-body current approximation, they can lead to results evidencing large discrepancies. Looking for an explanation of this spreading, it is shown that, for the largest part, these discrepancies can be related to a violation of Poincar\\'e space-time translation invariance. Beyond energy-momentum conservation, which is generally assumed, fulfilling this symmetry implies specific relations that are generally ignored. Their relevance within the present context is discussed in detail both to explain the differences between predictions and to remove them.

B. Desplanques

2006-11-17T23:59:59.000Z

252

Determination of mechanical properties of the high temperature ceramic superconductors YBa?Cu?O????x (where x[0.5)  

E-Print Network [OSTI]

). 2. M. K Wu, J. Ashburn, C. J. Torng, P. H. Hor, R. L. Meng, L. Gao, Z. J. Huang, Y. Q. Wang, and C. W. Chu, Phys. Rev. Lett. Vol. 58, p. 908 (1987). 3. S. Jin, T. H. Tiefel, R. C. Sherwood, G. W. Kammlott and S. M. Zahurak, Appl. Phys. Lett... mass of gauge crystal mj mass of component j mq mass of quartz spacer rod ms mass of specimen md+ mg mdgq mdgqs mt nld + nlg + nlq md+ mg+ mq+ms total mass N q -1 ideal transf'ormerratio of quartz mechanical damping of component j q -1...

Rahman, Saifur

2012-06-07T23:59:59.000Z

253

Microstructure and mechanical properties of Zircaloy-4 cladding hydrogenated at temperatures typical for loss-of-coolant accident (LOCA) conditions  

Science Journals Connector (OSTI)

Abstract The series of single rod tests was performed at KIT in framework of the new QUENCH-LOCA programme to investigate the properties of Zircaloy-4 claddings hydrogenated at temperatures of 900, 1000, 1100, and 1200K to hydrogen contents between 600 and 10,000wppm H. The impact of simultaneous annealing, phase transformation and hydriding processes on the material properties was investigated. Changes in microhardness revealed the distinct transition from annealing softening to hydrogen hardening. The intermediate stages of structure transformation during hydrogenation phase were registered. The X-ray diffractometry (XRD) analysis was applied to observe the existing phases in the tested samples including possibly precipitated hydrides as well as change in the lattice parameters a and c. The presence of ?- and ?-hydrides was clearly indicated by this method; however the dimensions of hydrides correspond rather to the nano-scale and could not be observed by optical microscopy. The evolution of XRD peak intensities and peak shift was analysed to estimate the texture change and concentration of dissolved hydrogen correspondingly. Tensile test examination of tube samples at room temperatures showed significant reduction of their residual ductility already at 700wppm H.

Anton Pshenichnikov; Juri Stuckert; Mario Walter

2014-01-01T23:59:59.000Z

254

High-field critical current and mechanical properties of in situ processed V/sub 3/Ga superconductors  

SciTech Connect (OSTI)

It is found, in this study, that the superconducting properties of in situ processed Cu-V/sub 3/Ga composite wire are crucially affected by most aspects of their processing. The critical current density increases with the rise of vanadium concentration up to 45 at .% V and then, owing to the decrease of the gallium penetration velocity, falls off rapidly. A high gallium concentration and large cross-sectional area reduction also increase the critical current density. The maximum value obtained for the sample wire has about five times as large as that of commercial multifilamentary V/sub 3/Ga wire. The values for the highest critical temperature and upper critical field were slightly above the best values for bronze-processed V/sub 3/Ga. Copper-vanadium ingots of a few kilograms were prepared by the continuous arc-casting method. Sufficient uniform distribution of fine vanadium dendrites was achieved throughout the ingot. It is found that the superconducting properties of wire prepared from the ingot are almost identical to those of laboratory-scale prepared in situ V/sub 3/Ga.

Kumakura, H.; Tachikawa, K.; Togano, K.

1982-01-01T23:59:59.000Z

255

Experimental tests of irradiation-anneal-reirradiation effects on mechanical properties of RPV plate and weld materials  

SciTech Connect (OSTI)

The Charpy-V (C{sub V}) notch ductility and tension test properties of three reactor pressure vessel (RPV) steel materials were determined for the 288{degree}C (550{degree}F) irradiated (I), 288{degree}C (550{degree}F) irradiated + 454{degree}C (850{degree}F)-168 h postirradiation annealed (IA), and 288{degree}C (550{degree}F) reirradiated (IAR) conditions. Total fluences of the I condition and the IAR condition were, respectively, 3.33 {times} 10{sup 19} n/cm{sup 2} and 4.18 {times} 10{sup 19} n/cm{sup 2}, E > 1 MeV. The irradiation portion of the IAR condition represents an incremental fluence increase of 1. 05 {times} 10{sup 19} n/cm{sup 2}, E > 1 MeV, over the I-condition fluence. The materials (specimens) were supplied by the Yankee Atomic Electric Company and represented high and low nickel content plates and a high nickel, high copper content weld deposit prototypical of the Yankee-Rowe reactor vessel. The promise of the IAR method for extending the fluence tolerance of radiation-sensitive steels and welds is clearly shown by the results. The annealing treatment produced full C{sub V} upper shelf recovery and full or nearly full recovery in the C{sub V} 41 J (30 ft-lb) transition temperature. The C{sub V} transition temperature increases produced by the reirradiation exposure were 22% to 43% of the increase produced by the first cycle irradiation exposure. A somewhat greater radiation embrittlement sensitivity and a somewhat greater reirradiation embrittlement sensitivity was exhibited by the low nickel content plate than the high nickel content plate. Its high phosphorus content is believed to be responsible. The IAR-condition properties of the surface vs. interior regions of the low nickel content plate are also compared.

Hawthorne, J.R. [Materials Engineering Associates, Inc., Lanham, MD (United States)

1996-01-01T23:59:59.000Z

256

Effects of rare earth oxides and UO2 + x on the structure and the mechanical properties of Zircaloy  

Science Journals Connector (OSTI)

Tension test specimens of Zircaloy have been annealed with simulated fission products, as CeO2, La2O3, Nd2O3, Y2O3 or mixtures of these rare earth oxides and UO2 + x at 350C up to 10 000 hours and at 500 or 700C up to 2000 hours. The long term effects have been studied by tension tests, scanning electron microscopy, X-ray diffraction and metallography. Annealing of Zircaloy at 700C with rare earth oxides generally leads to total embrittlement. There exists a gradation of efficacy which becomes obvious when the results of the annealing series at 500C are compared. Rare earth oxides in mixtures with UO2 + x cause improportional intense reductions of ductility. The structural characteristics of specimens lead to thermodynamic considerations of the probable reaction mechanism.

Fritz Holub

1985-01-01T23:59:59.000Z

257

Mechanical properties of Hastelloy X and Inconel 617 after aging 53,000 hours in HTGR-He  

SciTech Connect (OSTI)

Twenty-four creep and tensile samples of Hastelloy X, Inconel 617, and each material containing a transverse weldment were aged 53,000 h at 593, 704, and 871{sup 0}C in impure helium that simulated the coolant gas in a high-temperature gas-cooled reactor. Half of the samples were subjected to short-term tensile tests at 25{sup 0}C. Large changes in properties were noted at an aging temperature of 593{sup 0}C, and some overaging occurred at 704 and 871{sup 0}C. The other half of the samples is being creep tested, with each sample tested at its aging temperature. This portion of the test program is in progress, and the trend thus far seems to be that the aged material is weaker than unaged material. Metallographic studies showed that large amounts of precipitate had formed and that these (1) formed continuous intergranular layers that caused brittle fracture and (2) depleted the matrix in solid-solution strengthening elements and thereby reduced the creep strength. 5 refs., 46 figs., 10 tabs.

McCoy, H.E.

1985-09-01T23:59:59.000Z

258

Influence of dislocation-solute interactions on the mechanical properties of zirconium-doped NiAl  

SciTech Connect (OSTI)

Atom probe field ion microscopy (APFIM) has been used to characterize NiAl microalloyed with molybdenum and zirconium. Field ion images and atom probe analyses revealed segregation of zirconium to dislocation strain fields and ribbon-like morphological features that are probably related to dislocations. These results provide direct experimental evidence in support of the suggestion that the tremendous increase in the ductile-to-brittle transition temperature (DBTI) in zirconium-doped NiAl is due to pinning of dislocations by zirconium atoms. Atom probe analyses also revealed segregation of zirconium to grain boundaries. This result is consistent with the change from an intergranular fracture mode in undoped NiAl to a mixture of intergranular and transgranular fracture mode in zirconium-doped NiAl. The NiAl matrix was severely depleted of the solutes molybdenum and zirconium. Small Mo-rich precipitates, detected in the matrix and grain boundaries, are likely to contribute to the significant increase in the room-temperature yield stress of microalloyed NiAl through a precipitation hardening mechanism.

Jayaram, R. [Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Miller, M.K. [Oak Ridge National Lab., TN (United States)

1995-03-01T23:59:59.000Z

259

Specification of CuCrZr Alloy Properties after Various Thermo-Mechanical Treatments and Design Allowables including Neutron Irradiation Effects  

SciTech Connect (OSTI)

Precipitation hardened CuCrZr alloy is a promising heat sink and functional material for various applica- tions in ITER, for example the first wall, blanket electrical attachment, divertor, and heating systems. Three types of thermo-mechanical treatment were identified as most promising for the various applica- tions in ITER: solution annealing, cold working and ageing; solution annealing and ageing; solution annealing and ageing at non-optimal condition due to specific manufacturing processes for engineer- ing-scale components. The available data for these three types of treatments were assessed and mini- mum tensile properties were determined based on recommendation of Structural Design Criteria for the ITER In-vessel Components. The available data for these heat treatments were analyzed for assess- ment of neutron irradiation effect. Using the definitions of the ITER Structural Design Criteria the design allowable stress intensity values are proposed for CuCrZr alloy after various heat treatments.

Barabash, Vladimir [ITER Organization, Saint Paul Lez Durance, France] [ITER Organization, Saint Paul Lez Durance, France; Kalinin, G. M. [RDIPE, P.O. Box 788, 101000 Moscow, Russia] [RDIPE, P.O. Box 788, 101000 Moscow, Russia; Fabritsiev, Sergei A. [D.V. Efremov Scientific Research Institute, St. Petersburg, Russia] [D.V. Efremov Scientific Research Institute, St. Petersburg, Russia; Zinkle, Steven J [ORNL] [ORNL

2012-01-01T23:59:59.000Z

260

Local mechanical properties of Alloy 82/182 dissimilar weld joint between SA508 Gr.1a and F316 SS at RT and 320C  

SciTech Connect (OSTI)

This paper presents the variations of local mechanical and microstructural properties in dissimilar metal weld joints consisting of the SA508 Gr.1a ferritic steel, Alloy 82/182 filler metal, and F316 austenitic stainless steel. Flat or round tensile specimens and transmission electron microscopy disks were taken from the base metals, welds, and heat-affected zones (HAZ) of the joints and tested at room temperature (RT) and/or at 320 C. The tensile test results indicated that the mechanical property was relatively uniform within each material zone, but varied considerably between different zones. Further, significant variations were observed both in the austenitic HAZ of F316 SS and in the ferritic HAZ of SA508 Gr.1a. The yield stress (YS) of the weld metal was under-matched with respect to the HAZs of SA508 Gr.1a and F316 SS by 0.78 to 0.92, although the YS was over-matched with respect to both base metals. The minimum ductility occurred in the HAZ of SA508 Gr.1 at both test temperatures. The plastic instability stress also varied considerably in the weld joints, with minimum values occurring in the SA508 Gr.1a base metal at RT and in the HAZ of F316 SS at 320 C, suggesting that the probability of ductile failure caused by a unstable deformation at the Alloy 82/182 buttering layer is low. Within the HAZ of SA508 Gr.1a, the gradient of the YS and ultimate tensile strength (UTS) was significant, primarily because of the different microstructures produced by the phase transformation during the welding process. The increment of YS was unexpectedly high in the HAZ of F316 SS, which was explained by the strain hardening induced by a strain mismatch between the weldment and the base metal. This was confirmed by the transmission electron micrographs showing high dislocation density in the HAZ.

Byun, Thak Sang [ORNL; Kim, Jin Weon [ORNL

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Effects of testing and storage environments on mechanical properties of Ni-plated and bare U-3/4 wt% Ti  

SciTech Connect (OSTI)

It was found that storage environments with an adequate supply of oxygen can effectively minimize moisture corrosion of bare U-3/4 Ti. In particular, 0.75 cm/sup 3/ of dry air is calculated to protect 1 cm/sup 2/ of U-3/4 Ti for 20 years storage at room temperature. Consideration of the geometric details of U-3/4 Ti alloy specimens and the free volumes of air (and hence O/sub 2/) available can satisfactorily explain discrepancies in corrosion behavior between recent tests and previously reported data. The storage environment at 70/sup 0/C produces a minor strength increase in bare samples with increasing time. Decreases in ductility are observed for testing conditions of low temperature, low strain rate, and/or high humidity. Surface cracks occur under the same conditions conducive to corrosion, i.e., moderate temperatures, low strain rates, and high humidity. Significant increases in strength result under low-temperature and high-strain-rate conditions of tensile testing. Residual chloride contamination may be responsible for the occasional and otherwise unexplained large scatter in ductility for nominally similar specimens and test conditions. Nickel plating is observed to cause a statistically significant decrease in tensile strength, but no effect on the yield strength or ductility was observed and the presence of high explosive during the aging of tensile bars was observed to have no effect on mechanical properties.

Zehr, S.W.; Johnson, H.R.; Smugeresky, J.E.; Pashman, K.A.; Nagelberg, A.S.

1980-01-01T23:59:59.000Z

262

Influence of nano-ZrO2 on the mechanical and thermal properties of high temperature cementitious thermal energy storage materials  

Science Journals Connector (OSTI)

Abstract The mechanical and thermal properties of high temperature aluminate cementitious thermal energy storage materials modified with nano-ZrO2 are investigated. The influence of nano-ZrO2 amounts on the performance, such as compressive strength, thermal conductivity, volume heat capacity, and thermal expansion coefficient, of hardened composite cement pastes were studied for future solar thermal energy materials with better performance. It is observed that before heating the pore structure and compressive strength are both optimized at the optimum nano-ZrO2 amount of 1wt%. At the same time, thermal conductivity and volume heat capacity of the composite paste enriched with nano-ZrO2 improved after heating at 350 and 900C compared with that of pure paste, which is very favorable for high thermal storage materials application. XRD, TGDSC, FTIR, and MIP were used to characterize the mineral phases, the hydration/dehydration evolution, the chemical bonding, and the pore structures of the hydration products, respectively.

Huiwen Yuan; Yu Shi; Zhongzi Xu; Chunhua Lu; Yaru Ni; Xianghui Lan

2013-01-01T23:59:59.000Z

263

Physical process Mechanical mechanisms  

E-Print Network [OSTI]

1 Physical process Generation · Mechanical mechanisms F = m·a · Electric/Magnetic mechanisms F ­ Quadrupoles......shear stress fluctuations ­ High order poles...... phys. interpretation difficult Governing

Berlin,Technische Universität

264

Effect of MnO on the microstructures, phase stability and mechanical properties of ceria-partially-stabilized zirconia (Ce-TZP) and Ce-TZP-Al sub 2 O sub 3 composites  

SciTech Connect (OSTI)

Effect of increasing amounts of MnO additions on the microstructures, phase stability and mechanical properties of ZrO{sub 2}-12 m% CeO{sub 2} and ZrO{sub 2}-12 m% CeO{sub 2}-10 w% Al{sub 2}O{sub 3} were studied. MnO suppressed grain growth in ZrO{sub 2}-12 m% CeO{sub 2}, while enhancing the mechanical properties significantly (strength=557 MPa, fracture toughness=9.3 MPa.(m){sup 1/2} at 0.2 w% MnO). The enhanced mechanical properties were achieved despite an increased stability of the tetragonal phase as evidenced by a lower burst transformation temperature (M{sub b}) and a reduced volume fraction of the monoclinic phase on the fracture surface. In ZrO{sub 2}-12 m% CeO{sub 2}-10 w% Al{sub 2}O{sub 3}, the addition of MnO suppressed the grain size of ZrO{sub 2}, while promoting grain growth and changing the morphology of Al{sub 2}O{sub 3}. More significantly, the stability of the tetragonal ZrO{sub 2} phase decreased (high M{sub b} temperature) with a concurrent increase in fracture toughness (13.2 MPa.(m){sup 1/2} at 2 w% MnO) and transformation plasticity (1.2% in four-point bending). The widths of the transformation zones observed adjacent to the fracture surfaces showed a consistent inverse relation to the transformation yield stress as would be expected from the mechanics of stress-induced phase transformation at crack tips. The improvements in mechanical properties obtained in the base Ce-TZP and the Ce-TZP-Al{sub 2}O{sub 3} composite ceramics with the addition of MnO are critically examined in the context of transformation toughening and other possible mechanisms.

Wang, J.S.; Tsai, J.F.; Shetty, D.K.; Virkar, A.V. (Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT (USA))

1990-09-01T23:59:59.000Z

265

Mechanical Behavior of Indium Nanostructures  

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

Mechanical Behavior of Indium Nanostructures Print Indium is a key material in lead-free solder applications for microelectronics due to its excellent wetting properties, extended...

266

Dispersion and rheology of stabilized graphene colloids and gels.  

E-Print Network [OSTI]

??Single layer graphite, known as graphene, has evolved as an outstanding nanomaterial in recent years due to its excellent mechanical, thermal, and electrical properties, including (more)

Das, Sriya

2014-01-01T23:59:59.000Z

267

Recent Progress in the Development of N-type Skutterudites |...  

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

Progress in the Development of N-type Skutterudites Coupled with their outstanding mechanical properties, filled skutterudites show great promise for waste heat recovery...

268

Bioactive Glass Scaffolds for Bone Regeneration  

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

Bioactive Glass Scaffolds for Bone Regeneration Print Natural materials are renowned for their unique combination of outstanding mechanical properties and exquisite microstructure....

269

The effect of strain and path change on the mechanical properties and microstructural evolution of ultrafine grained interstitial free steel during equal channel angular extrusion (ECAE)  

E-Print Network [OSTI]

The objectives of this study were to examine the effect of strain and path change on the microstructural evolution of ultrafine grained interstitial free (IF) steel during equal channel angular extrusion (ECAE); to determine the mechanical...

Sutter, Steven George

2007-04-25T23:59:59.000Z

270

Outstanding Problems in Particle Astrophysics  

E-Print Network [OSTI]

The general features of the cosmic-ray spectrum have been known for a long time. Although the basic approaches to understanding cosmic-ray propagation and acceleration have also been well understood for many years, there are several questions of great interest that motivate the current intense experimental activity in the field. The purpose of this lecture is to introduce the main topics of the School and to relate the theoretical questions to the experiments that can answer them.

Thomas K. Gaisser

2005-01-11T23:59:59.000Z

271

International Round-Robin on Transport Properties of Bismuth...  

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

Reliability of Transport Properties for Bulk Thermoelectrics Thermoelectric Mechanical Reliability Standardization of Transport Properties Measurements: Internal Energy...

272

Method and apparatus for the evaluation of a depth profile of thermo-mechanical properties of layered and graded materials and coatings  

DOE Patents [OSTI]

A technique for determining properties such as Young`s modulus, coefficient of thermal expansion, and residual stress of individual layers within a multi-layered sample is presented. The technique involves preparation of a series of samples, each including one additional layer relative to the preceding sample. By comparison of each sample to a preceding sample, properties of the topmost layer can be determined, and residual stress at any depth in each sample, resulting from deposition of the top layer, can be determined. 11 figs.

Finot, M.; Kesler, O.; Suresh, S.

1998-12-08T23:59:59.000Z

273

J Phys. III IYance 7 (1997) 2393-2403 DECEMBER1997, PAGE 2393 Microstructures and Mechanical Properties of NiAl-(Cr)  

E-Print Network [OSTI]

of Materials and its Effects on Microstructures and Properties Abstract. The oxidation resistant light weight of these intermetallics are the low density, good creep strength and high temperature oxidation resistance. Among several discs, valves, etc.) and the relatively high thermal conductivity provides improved cooling efficiency

Paris-Sud XI, Université de

274

The Hessian biased force field for silicon nitride ceramics: Predictions of thermodynamic and mechanical properties for CX-and @S&N4  

E-Print Network [OSTI]

that these calculations provide the first reliable data on such fundamental properties of silicon nitride. This MSXX force in diesel en- gines, industrial heat exchangers, and gas turbines, to name but a few potential applications for engines insulated with silicon nitride, leads to an increased efficiency of these en- gines. However

Goddard III, William A.

275

The effect of equal channel angular extrusion on the microstructure and mechanical properties of AISI 1552, AISI 4340, and A2 tool steels  

E-Print Network [OSTI]

, and microstructure was determined. Significant improvements in these properties were realized with some sacrifice of ductility. The ausformed (at 950' C) and tempered (at 700' C) A2 tool steel produced 275%, 233%, and 61% higher hardness, YS, and UTS values than...

Shadat, Mohammed Anower

1998-01-01T23:59:59.000Z

276

Mechanics of Jointed and Faulted Rock, Rossmanith (ed) 0 1995 Balkema, Rotterdam. ISBN 90 54 10 54 7 0 Seismic properties of a general fracture  

E-Print Network [OSTI]

7 0 Seismic properties of a general fracture E. Liu British Geological Survey Edinburgh, UK J Inc., Ponca Cig Okla., USA ABSTRACT: In modelling the wave behaviour through fractured and jointed rocks, different models have been proposed to describe the fractures. A fracture can be modelled (1

Edinburgh, University of

277

Studies on Mechanical Properties, Thermal Degradation, and Combustion Behaviors of Poly(1,4-butylene terephthalate)/Glass Fiber/Cerium Hypophosphite Composites  

Science Journals Connector (OSTI)

For the GRPBT composite with 15 wt % of CHP, the storage modulus value at 30 C was 3 times that of GRPBT. ... Yang, W.; Hu, Y.; Tai, Q. L.; Lu, H. D.; Song, L.; Yuen, R. K. K.Fire and mechanical performance of nanoclay reinforced glass-fiber/PBT composites containing aluminum hypophosphite particles Composites, Part A 2011, 42, 794 800 ...

Wei Yang; Ningning Hong; Lei Song; Yuan Hu; Richard K. K. Yuen; Xinglong Gong

2012-06-04T23:59:59.000Z

278

Property-Assessed Clean Energy Programs  

Broader source: Energy.gov [DOE]

The property-assessed clean energy (PACE) model is an innovative mechanism for financing energy efficiency and renewable energy improvements on private property. PACE programs allow local...

279

AMEAerospace & Mechanical  

E-Print Network [OSTI]

AMEAerospace & Mechanical Engineering #12;Aerospace and Mechanical Engineers design complex mechanical, thermal, fluidic, acousti- cal, optical, and electronic systems, with char- acteristic sizes space. Aerospace and Mechanical Engineering (AME) students conduct basic and applied research within

Wang, Hai

280

MECHANICAL ENGINEERING SENIOR WINS FIRST PLACE IN INTERNATIONAL COMPETITION  

E-Print Network [OSTI]

MECHANICAL ENGINEERING SENIOR WINS FIRST PLACE IN INTERNATIONAL COMPETITION 2009-2010 Mechanical. The competition took place at the 2010 ASME International Mechanical Engineering Congress and Exposition measurement of curvature and mechanical properties of cellular specimens. This successful project

Holsinger, Kent

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Neutron irradiation effects on the structural, magnetic and mechanical properties of amorphous and nanocrystalline Fe{sub 73.5}Cu{sub 1}Nb{sub 3}Si{sub 13.5}B{sub 9}  

SciTech Connect (OSTI)

The response of the structural, magnetic and mechanical properties of amorphous and nanocrystalline Fe{sub 73.5}Cu{sub 1}Nb{sub 3}Si{sub 13.5}B{sub 9} to radiation damage is investigated by means of Moessbauer spectroscopy, hysteresis loop measurements and by bending tests. The irradiation of the nanocrystalline as well as differently thermally treated amorphous samples is performed in the in-core reactor position. Moessbauer experiments reveal that neutron irradiation leads to partial re-amorphization in the investigated nanocrystalline alloys. For all samples it is found that the deterioration of the soft magnetic properties occurs predominantly in the higher fluence range (10{sup 18}--10{sup 19} n{sub th}{center_dot}cm{sup {minus}2}). However, this deterioration is less significant in the noncrystalline samples. The results of the bending tests show that all samples thermally embrittled below the crystallization temperature (still amorphous) can regain the complete ductility after neutron irradiation. On the other hand, the level of embrittlement of the nanocrystalline samples remained the same even after irradiation to the fluence of 1 {times} 10{sup 19}n{sub th}{center_dot}cm{sup {minus}2}.

Skorvanek, I. [Inst. of Experimental Physics, Kosice (Slovakia)] [Inst. of Experimental Physics, Kosice (Slovakia); Gerling, R. [GKSS-Forschungszentrum, Geesthacht (Germany)] [GKSS-Forschungszentrum, Geesthacht (Germany); Graf, T.; Fricke, M.; Hesse, J. [Technische Univ., Braunschweig (Germany). Inst. fuer Metallphysik und Nucleare Festkoerperphysik] [Technische Univ., Braunschweig (Germany). Inst. fuer Metallphysik und Nucleare Festkoerperphysik

1994-03-01T23:59:59.000Z

282

Transport and mechanical property evaluation of (AgSbTe){sub 1-x}(GeTe){sub x} (x=0.80, 0.82, 0.85, 0.87, 0.90)  

SciTech Connect (OSTI)

(AgSbTe{sub 2}){sub 1-x}(GeTe){sub x} (known collectively by the acronym of their constituent elements as TAGS-x, where x designates the mole fraction of GeTe) materials, despite being described over 40 years ago, have only recently been studied in greater detail from a fundamental standpoint. We have prepared a series of samples with composition (AgSbTe{sub 2}){sub 1-x}(GeTe){sub x} (x=0.80, 0.82, 0.85, 0.87 and 0.90). Cast ingots of the above compositions were ground and consolidated by spark plasma sintering (SPS). Sintering conditions, specifically high applied pressures of 65 MPa and slow heating rates, were identified as important variables that lead to samples with low porosity and good mechanical strength. The resulting ingots were cut for high temperature electrical, thermal transport and mechanical property evaluation. TAGS-85 was found to have the highest ZT of all samples investigated (ZT=1.36 at 700 K) as a result of its very low value of thermal conductivity. Hall effect measurements performed from 5 to 300 K found these materials to have complex multi-band transport characteristics. - Graphical Abstract: Powder X-ray diffraction of TAGS-x (x=0.80, 0.82, 0.85, 0.87 and 0.90) showing characteristic bifurcation indicative of rhombohedral structure.

Salvador, James R., E-mail: james.salvador@gm.c [Materials and Processes Laboratory, GM R and D Center, Warren, MI 48090 (United States); Yang, J. [Materials and Processes Laboratory, GM R and D Center, Warren, MI 48090 (United States); Shi, X. [Optimal, Inc. Plymouth Township, MI 48170 (United States); Wang, H.; Wereszczak, A.A. [High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)

2009-08-15T23:59:59.000Z

283

E-Print Network 3.0 - achilles tendon mechanical Sample Search...  

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

mechanical Search Powered by Explorit Topic List Advanced Search Sample search results for: achilles tendon mechanical Page: << < 1 2 3 4 5 > >> 1 Mechanical properties of the...

284

Mechanics of Polymer?Clay Nanocomposites  

Science Journals Connector (OSTI)

The mechanics of nanocomposites is critical in the design of nanomaterials with desirable properties. In this paper, the mechanics of polymer?clay nanocomposites is studied using a designed polymer and solution nanocomposite synthesis. A copolymer latex, ...

YuanQiao Rao; John M. Pochan

2006-12-16T23:59:59.000Z

285

Deformation of shale: mechanical properties and indicators of mechanisms  

E-Print Network [OSTI]

Basins, shales of Devonian age are commonly considered reservoir rocks I' or natural gas [Woodward, 1958; Lockett, 1968; Long, 1979; Gonzales and Johnson, 1985], Economic gas production from the Devonian shales of these basins is associated..., 1967; Chang et al. , 1979; Smith and Cheatham, 1980; Jordan and Nuesch, 1989; Nuesch, 1991]. Shales deform by fracture and friction-controlled slip at low mean stresses (& 200 MPa), while semi-brittle cataclasis and kinking are observed at high...

Ibanez, William Dayan

2012-06-07T23:59:59.000Z

286

Investigation of mechanical properties of recycled polypropylene.  

E-Print Network [OSTI]

??Every year there is an Increase in the amount of plastics formed by all types of processes, such as extrusion, blow moulding, injection moulding, etc (more)

Elgammudi, Lutfi Furji

2007-01-01T23:59:59.000Z

287

Electrical and Mechanical Properties of Graphene.  

E-Print Network [OSTI]

??Graphene is an exciting new atomically-thin two-dimensional (2D) system of carbon atoms organized in a hexagonal lattice structure. This "wonder material" has been extensively studied (more)

Bao, Wenzhong

2011-01-01T23:59:59.000Z

288

High Temperature Mechanical Properties as Design Parameters  

Science Journals Connector (OSTI)

...corrosion resistance or high proof strength...development of more efficient power plant, process...Figure 2 shows a high temperature bolt...S.O.) of a Boiler Code (I968...power plant for high temperature pipework, boiler headers, valve...

1976-01-01T23:59:59.000Z

289

Electrical and Mechanical Properties of Graphene  

E-Print Network [OSTI]

in carbon nanotube Josephson Junctions, Phys. Rev. Lett. ,45 Fig. 3-1 (a) Schematic diagram of Josephson junction. (b)An SEM image of a xviii graphene Josephson junction

Bao, Wenzhong

2011-01-01T23:59:59.000Z

290

Electrical and Mechanical Properties of Graphene  

E-Print Network [OSTI]

Transport in a Suspended Graphene Sheet, Phys. Rev. Lett. ,Novoselov, The rise of graphene, Nat. Mater. , 6 (2007) [24]mobility in suspended graphene, Sol. State Commun. , 146 (

Bao, Wenzhong

2011-01-01T23:59:59.000Z

291

Mechanical Properties of Structural Steels in Hydrogen  

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

C. San Marchi, and M. Yip Sandia National Laboratories Livermore, CA DOE Hydrogen Pipeline Working Group Meeting Aiken, SC September 25-26, 2007 H H H ddt 0 H 2 H 2...

292

Mechanical Evaluation of Electronic Properties of Materials  

E-Print Network [OSTI]

-displacement curve measured via indentation from 5.55 x 10^-10 J to 4.78 x 10^-10 J when the gold-palladium thin-film sputtered on PVDF is changed from the flat arrangement to the convex arrangement. Furthermore, the strain also changed the electrical resistance...

Nudo, Nicholas

2011-05-02T23:59:59.000Z

293

Elastic proteins: biological roles and mechanical properties  

Science Journals Connector (OSTI)

...spring capacity energy storage capacity, Jkg 1 Wout...fibres were tested in seawater and tendon collagen...well as strain-energy storage devices at low frequencies...unmatched capacity for the storage of elastic-strain...normally function in seawater, but when dry, or...

2002-01-01T23:59:59.000Z

294

Structural and magnetic properties of mechanically milled Y{sub 1-x}Pr {sub x}Co{sub 5} compounds [x = 0, 0.1, 0.3, 0.5  

SciTech Connect (OSTI)

Samples of composition Y{sub 1-x}Pr {sub x}Co{sub 5} (x = 0, 0.1, 0.3, 0.5) were arc melted in an argon atmosphere, mechanically milled for various times and heat treated at about 1073 K for short periods of time, in order to obtain nanocrystalline compounds. The X-ray diffraction patterns after the heat treatment indicated a single hexagonal 1:5 phase for each composition. The unit cell parameters varied with Pr content in the Y{sub 1-x}Pr {sub x}Co{sub 5} series. The crystallite size determined from transmission electron micrographs was about 13 nm. The intrinsic coercivity increased with Pr content; a maximum coercivity of 1.17 MA/m and an enhanced relative remanence magnetization to maximum magnetization ratio {sigma} {sub r}/{sigma} {sub max} = 0.71 were achieved after heat treatment for the composition Y{sub 0.5}Pr{sub 0.5}Co{sub 5}. The enhanced magnetic properties suggest strong intergranular exchange coupling in this composition, consistent with the very fine crystallite size.

Elizalde Galindo, J.T. [Department of Physics, University of Texas at El Paso, 500 W. University Avenue, El Paso, TX 79968, (United States)]. E-mail: jose.elizalde.galindo@gmail.com; Davies, H.A. [Department of Engineering Materials, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD (United Kingdom)]. E-mail: h.a.davies@sheffield.ac.uk; Matutes-Aquino, J.A. [Centro de Investigacion en Materiales Avanzados, S.C (CIMAV), Miguel de Cervantes 120, Chihuahua, Chih., 31109 (Mexico)]. E-mail: jose.matutes@cimav.edu.mx

2007-08-15T23:59:59.000Z

295

SRNL's Gupta Elected Fellow of American Society of Mechanical  

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

Gupta Elected Fellow of Gupta Elected Fellow of American Society of Mechanical Engineers (ASME) AIKEN, S.C. (May 29, 2012) - Narendra K. Gupta, a principal engineer with the U.S. Department of Energy's Savannah River National Laboratory, was elected as a Fellow of ASME. Founded in 1880 as the American Society of Mechanical Engineers, ASME is a not-for-profit professional organization that enables collaboration, knowledge sharing and skill development across all engineering disci- plines. The grade of Fellow recognizes outstanding engineering achievement; the distinction has only been granted to approximately 3 percent of ASME's 102,000 members. Gupta is a Registered Professional Engineer with 37 years of design and analysis experience, including 22 years in the design and analysis of systems and

296

Mechanical memory  

DOE Patents [OSTI]

A first-in-first-out (FIFO) microelectromechanical memory apparatus (also termed a mechanical memory) is disclosed. The mechanical memory utilizes a plurality of memory cells, with each memory cell having a beam which can be bowed in either of two directions of curvature to indicate two different logic states for that memory cell. The memory cells can be arranged around a wheel which operates as a clocking actuator to serially shift data from one memory cell to the next. The mechanical memory can be formed using conventional surface micromachining, and can be formed as either a nonvolatile memory or as a volatile memory.

Gilkey, Jeffrey C. (Albuquerque, NM); Duesterhaus, Michelle A. (Albuquerque, NM); Peter, Frank J. (Albuquerque, NM); Renn, Rosemarie A. (Albuquerque, NM); Baker, Michael S. (Albuquerque, NM)

2006-05-16T23:59:59.000Z

297

Mechanical memory  

DOE Patents [OSTI]

A first-in-first-out (FIFO) microelectromechanical memory apparatus (also termed a mechanical memory) is disclosed. The mechanical memory utilizes a plurality of memory cells, with each memory cell having a beam which can be bowed in either of two directions of curvature to indicate two different logic states for that memory cell. The memory cells can be arranged around a wheel which operates as a clocking actuator to serially shift data from one memory cell to the next. The mechanical memory can be formed using conventional surface micromachining, and can be formed as either a nonvolatile memory or as a volatile memory.

Gilkey, Jeffrey C. (Albuquerque, NM); Duesterhaus, Michelle A. (Albuquerque, NM); Peter, Frank J. (Albuquerque, NM); Renn, Rosemarie A. (Alburquerque, NM); Baker, Michael S. (Albuquerque, NM)

2006-08-15T23:59:59.000Z

298

Mechanical Engineering Department "The Lindbergh Lectures"  

E-Print Network [OSTI]

Mechanical Engineering Department "The Lindbergh Lectures" Thursday, October 31st, 2013 12:00 ­ 12:50 PM Room 1106 Mechanical Engineering Building Challenges in Nanocomposites: Mixing and Predictable mechanical, thermal and electrical properties, rendering them as ideal fillers for advanced polymer

Wisconsin at Madison, University of

299

Computational mechanics  

SciTech Connect (OSTI)

The Computational Mechanics thrust area sponsors research into the underlying solid, structural and fluid mechanics and heat transfer necessary for the development of state-of-the-art general purpose computational software. The scale of computational capability spans office workstations, departmental computer servers, and Cray-class supercomputers. The DYNA, NIKE, and TOPAZ codes have achieved world fame through our broad collaborators program, in addition to their strong support of on-going Lawrence Livermore National Laboratory (LLNL) programs. Several technology transfer initiatives have been based on these established codes, teaming LLNL analysts and researchers with counterparts in industry, extending code capability to specific industrial interests of casting, metalforming, and automobile crash dynamics. The next-generation solid/structural mechanics code, ParaDyn, is targeted toward massively parallel computers, which will extend performance from gigaflop to teraflop power. Our work for FY-92 is described in the following eight articles: (1) Solution Strategies: New Approaches for Strongly Nonlinear Quasistatic Problems Using DYNA3D; (2) Enhanced Enforcement of Mechanical Contact: The Method of Augmented Lagrangians; (3) ParaDyn: New Generation Solid/Structural Mechanics Codes for Massively Parallel Processors; (4) Composite Damage Modeling; (5) HYDRA: A Parallel/Vector Flow Solver for Three-Dimensional, Transient, Incompressible Viscous How; (6) Development and Testing of the TRIM3D Radiation Heat Transfer Code; (7) A Methodology for Calculating the Seismic Response of Critical Structures; and (8) Reinforced Concrete Damage Modeling.

Goudreau, G.L.

1993-03-01T23:59:59.000Z

300

Effect of substrate temperature on the electrospark deposition, structure, and mechanical properties of coatings. III. effect of substrate preliminary treatment on the electrospark deposition and phase composition of coatings  

Science Journals Connector (OSTI)

The effect of preliminary treatment of a steel substrate on the dynamic properties of cathode jets during electrospark deposition is studied. The energy of cathode jets...

V. D. Belik; R. V. Litvin; M. S. Kovalchenko

2012-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Mechanical Behavior of Indium Nanostructures  

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

Mechanical Behavior of Indium Nanostructures Print Mechanical Behavior of Indium Nanostructures Print Indium is a key material in lead-free solder applications for microelectronics due to its excellent wetting properties, extended ductility, and high electrical conductivity. With the size of electronic devices continuing to shrink and the promise of indium-based nanotechnologies, it is important to develop a fundamental understanding of this material's small-scale mechanical properties and reliability. Researchers from the University of Waterloo, California Institute of Technology, and Los Alamos National Laboratory have collaborated with a team at ALS Beamline 12.3.2 to investigate the small-scale mechanics of indium nanostructures. Scanning x-ray microdiffraction (μSXRD) studies revealed that the indium microstructure is typical of a well-annealed metal, containing very few initial dislocations and showing close-to-theoretical strength.

302

Mechanical Behavior of Indium Nanostructures  

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

Mechanical Behavior of Indium Nanostructures Print Mechanical Behavior of Indium Nanostructures Print Indium is a key material in lead-free solder applications for microelectronics due to its excellent wetting properties, extended ductility, and high electrical conductivity. With the size of electronic devices continuing to shrink and the promise of indium-based nanotechnologies, it is important to develop a fundamental understanding of this material's small-scale mechanical properties and reliability. Researchers from the University of Waterloo, California Institute of Technology, and Los Alamos National Laboratory have collaborated with a team at ALS Beamline 12.3.2 to investigate the small-scale mechanics of indium nanostructures. Scanning x-ray microdiffraction (μSXRD) studies revealed that the indium microstructure is typical of a well-annealed metal, containing very few initial dislocations and showing close-to-theoretical strength.

303

Mechanical Behavior of Indium Nanostructures  

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

Mechanical Behavior of Indium Nanostructures Print Mechanical Behavior of Indium Nanostructures Print Indium is a key material in lead-free solder applications for microelectronics due to its excellent wetting properties, extended ductility, and high electrical conductivity. With the size of electronic devices continuing to shrink and the promise of indium-based nanotechnologies, it is important to develop a fundamental understanding of this material's small-scale mechanical properties and reliability. Researchers from the University of Waterloo, California Institute of Technology, and Los Alamos National Laboratory have collaborated with a team at ALS Beamline 12.3.2 to investigate the small-scale mechanics of indium nanostructures. Scanning x-ray microdiffraction (μSXRD) studies revealed that the indium microstructure is typical of a well-annealed metal, containing very few initial dislocations and showing close-to-theoretical strength.

304

Mechanical Dissipation in Silicon Flexures  

E-Print Network [OSTI]

The thermo-mechanical properties of silicon make it of significant interest as a possible material for mirror substrates and suspension elements for future long-baseline gravitational wave detectors. The mechanical dissipation in 92um thick single-crystal silicon cantilevers has been observed over the temperature range 85 K to 300 K, with dissipation approaching levels down to phi = 4.4E-7.

S. Reid; G. Cagnoli; D. R. M. Crooks; J. Hough; P. Murray; S. Rowan; M. M. Fejer; R. Route; S. Zappe

2005-10-28T23:59:59.000Z

305

Bridging properties of multiblock copolymers.  

SciTech Connect (OSTI)

Using self-consistent field theory, we attempt to elucidate the links between microscopically determined properties, such as the bridging fraction of chains, and mechanical properties of multiblock copolymer materials. We determine morphological aspects such as period and interfacial width and calculate the bridging fractions, and compare with experimental data .

Rasmussen, K. O. (Kim O.); Kober, E. M. (Edward M.); Lookman, T. (Turab); Saxena, A. B. (Avadh B.)

2003-01-01T23:59:59.000Z

306

Mechanical Vibration  

Science Journals Connector (OSTI)

... THE suppression and control of mechanical vibration have assumed great importance in engineering. One consequence of this is that the number ... degree of emphasis is placed on transient oscillation (in addition to steady-State and free vibration). The treatment of this topic is based mainly on phase-plane constructions and it ...

R. E. D. BISHOP

1958-12-06T23:59:59.000Z

307

Nafion Mechanical andNafion Mechanical and Surface PropertiesSurface Properties  

E-Print Network [OSTI]

cells (PEMFCs) are one such option. They provide electricity as follows: Introduction Stress_apollo17_big.gif Introduction However, there are challenges to overcome to be a viable alternative (temp-Relaxation Surface Wetting Conclusions Stress-Relaxation Data #12;9 Nafion 12% Strain Eqn. Fit Introduction Stress

Petta, Jason

308

Sandia National Laboratories: Sandian Selected for Outstanding...  

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

Engineer Award On June 4, 2014, in Energy, News, News & Events, Photovoltaic, Renewable Energy, Solar The Albuquerque Section of the Institute of Electrical and Electronics...

309

Facility Representative Program Outstanding at ID  

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

related to Nuclear Fundamentals, Environmental Management, Safety Management, Conduct of Operations, and Authorization Basis Requirements. Having basic knowledge and...

310

NOMINATION FOR RECOGNITION OF OUTSTANDING ACCOMPLISHMENT  

E-Print Network [OSTI]

Garrison, Fort A.P. Hill (VA) - Environmental & Natural Resources Division Justification: The CEMML staff & Natural Resources Division (ENRD): Forestry, Endangered Species Management, Cultural Resources Management, Recycling/Compliance, and Fish & Wildlife. On its face, the exceptionally high quality of the Fort A.P. Hill

311

Outstanding questions: physics beyond the Standard Model  

Science Journals Connector (OSTI)

...the astrophysical dark matter? How does one unify the fundamental interactions? How does one quantize gravity? In this article...dark matter? How does one unify the fundamental interactions? How does one quantize gravity? In this article...

2012-01-01T23:59:59.000Z

312

The nano-mechanical morphology of shale  

Science Journals Connector (OSTI)

Shale, the sealing formations in most hydrocarbon reservoirs, is made of highly compacted clay particles of sub-micrometer size, nanometric porosity and different mineralogy. In this paper, we propose and validate a technique to identify the nano-mechanical morphology of such a nanocomposite material. In particular, by means of a massive nanoindentation campaign at two different scales on a large range of shale materials, we show that the highly compacted plate- or sheet-like clay particles have a distinct nano-mechanical morphology with no privileged orientation of the particle-to-particle contact surface, as evidenced by a mechanical percolation threshold of ?0?0.5. Furthermore, the nanoindentation results provide strong evidence that the nano-mechanical elementary building block of shales is transversely isotropic in stiffness, and isotropic and frictionless in strength. These observations lead to a sphere-like mechanical morphology for visibly plate- or sheet-like clay particles. The contact forces between the sphere-like particles activate the intrinsicly anisotropic elastic properties within the clay particles and the cohesive bonds between the clay particles. The mechanical stiffness and strength properties of porous clay scale with the clay packing density toward a unique set of shale-invariant material properties. The determination of mechanical microstructure and invariant material properties are of great importance for the development of predictive microporomechanical models of the stiffness and strength properties of shale. The approach presented here also applies to other chemically and mechanically complex materials exhibiting nanogranular behavior.

Christopher Bobko; Franz-Josef Ulm

2008-01-01T23:59:59.000Z

313

Evolution of Frictional Behavior of Punchbowl Fault Gouges Sheared at Seismic Slip Rates and Mechanical and Hydraulic Properties of Nankai Trough Accretionary Prism Sediments Deformed at Different Loading Paths  

E-Print Network [OSTI]

Frictional measurements were made on natural fault gouge at seismic slip rates using a high-speed rotary-shear apparatus to study effects of slip velocity, acceleration, displacement, normal stress, and water content. Thermal-, mechanical...

Kitajima, Hiroko

2012-02-14T23:59:59.000Z

314

Department of Mechanical Engineering RESEARCH PROJECT  

E-Print Network [OSTI]

#12;Department of Mechanical Engineering OVERVIEW · Combustion of alternative biofuels for automotive · Combustion properties of biofuels, including biodiesel and biojet fuels · Shock tube ignition experiments for a New Generation of Aircrafts · Jets Manipulation and

Barthelat, Francois

315

Mechanics Methodology for Textile Preform Composite Materials  

Science Journals Connector (OSTI)

NASA and its contractors have completed a program to develop a basic mechanics underpinning for textile composites. Three major deliverables were produced by the program: (1.) a set of test methods for measuring material properties and design allowables, ...

Jr Clarence C. Poe

1996-11-01T23:59:59.000Z

316

Key Physical Mechanisms in Nanostructured Solar Cells  

SciTech Connect (OSTI)

The objective of the project was to study both theoretically and experimentally the excitation, recombination and transport properties required for nanostructured solar cells to deliver energy conversion efficiencies well in excess of conventional limits. These objectives were met by concentrating on three key areas, namely, investigation of physical mechanisms present in nanostructured solar cells, characterization of loss mechanisms in nanostructured solar cells and determining the properties required of nanostructured solar cells in order to achieve high efficiency and the design implications.

Dr Stephan Bremner

2010-07-21T23:59:59.000Z

317

Center for Materials at Irradiation and Mechanical Extremes:...  

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

Research Assistant, Los Alamos National Laboratory, 1989-1993 Reseearch Interests Mechanical Properties of materials at high strain rates and high temperatures Radiation Effects...

318

Cryogenic properties of optomechanical silica microcavities  

E-Print Network [OSTI]

We present the optical and mechanical properties of high-Q fused silica microtoroidal resonators at cryogenic temperatures (down to 1.6 K). A thermally induced optical multistability is observed and theoretically described; it serves to characterize quantitatively the static heating induced by light absorption. Moreover the influence of structural defect states in glass on the toroid mechanical properties is observed and the resulting implications of cavity optomechanical systems on the study of mechanical dissipation discussed.

Olivier Arcizet; Rmi Rivire; Albert Schliesser; Tobias J. Kippenberg

2009-01-09T23:59:59.000Z

319

Hydrogen Properties  

Broader source: Energy.gov [DOE]

The atomic structure, physical and chemical properties, flammability and safety, fundamental gas laws, how pressure, temperature and mass flow are measured

320

Mechanical & Aerospace Engineering  

E-Print Network [OSTI]

Mechanical & Aerospace Engineering An experimental methodology is presented for mechanism verification of physics-based prognosis of mechanical damage, such as fatigue. The proposed experimental methodology includes multi-resolution in-situ mechanical testing, advanced imaging analysis, and mechanism

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Increasing carbon nanotube forest density  

E-Print Network [OSTI]

The outstanding mechanical, electrical, thermal, and morphological properties of individual carbon nanotubes (CNTs) open up exciting potential applications in a wide range of fields. One such application is replacing the ...

McCarthy, Alexander P

2014-01-01T23:59:59.000Z

322

The design and synthesis of polymeric assemblies for materials applications : chemosensing, liquid crystal alignment and block copolymers  

E-Print Network [OSTI]

Conjugated polymers are an indispensable class of materials that have advanced the development of optoelectronic device architectures; in part, due to their outstanding electronic and mechanical properties. This thesis ...

Cox, Jason R. (Jason Robert)

2012-01-01T23:59:59.000Z

323

Electrical resistivity mechanism in magnetorheological elastomer  

E-Print Network [OSTI]

Electrical resistivity mechanism in magnetorheological elastomer N Kchit, G Bossis L.P.M.C. UMR properties such as a large change of electrical resistivity with applied pressure. In order to understand the conduction mechanism in such composite, the influence of pressure on the electrical resistivity of metal

Paris-Sud XI, Université de

324

E-Print Network 3.0 - arterial wall properties Sample Search...  

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

properties Page: << < 1 2 3 4 5 > >> 1 Effects of elastin haploinsufficiency on the mechanical behavior of mouse arteries Summary: properties to artery wall composition....

325

Personal Property  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

This Guide provides non-regulatory guidance and information to assist DOE organizations and contractors in implementing the DOE-wide and site-specific personal property management programs. It supplements the policy, requirements, and responsibilities information contained in the DOE Order cited above and clarifies the regulatory requirements contained in the Federal Property Management Regulation (FMR) and specific contracts.

2014-10-16T23:59:59.000Z

326

Photo-, Bio-, and Magneto-active Colored Polyester Fabric with Hydrophobic/Hydrophilic and Enhanced Mechanical Properties through Synthesis of TiO2/Fe3O4/Ag Nanocomposite  

Science Journals Connector (OSTI)

(9-12) Reducing the photo yellowing of wool, obtaining self-cleaning wool fabrics, nano-photo-scouring, and nano-photobleaching of cotton and wool fabrics, enhancing nano-TiO2 adsorption on the blend of wool/polyester by biofinishing and producing polyester fabrics with simultaneous self-cleaning, antimicrobial, and UV protection properties, free carrier dyeing of nano-TiO2 treated polyester fabric, mothproofing of wool fabric by treatment with nano-TiO2 and sono-synthesis of TiO2 nanoparticles on cotton fabric producing self-cleaning and UV protection properties are some of the major applications of nano-TiO2 particles in textiles. ... (20, 21) The photoinduced silver on nano-titanium dioxide was reported as an enhanced antimicrobial agent for wool fabric. ... Montazer, M.; Morshedi, S.Nano Photo Scouring and Nano Photo Bleaching of Raw Cellulosic Fabric Using Nano TiO2 Int. ...

Tina Harifi; Majid Montazer

2013-12-30T23:59:59.000Z

327

Property:Wavemaking Description | Open Energy Information  

Open Energy Info (EERE)

Description Description Jump to: navigation, search Property Name Wavemaking Description Property Type Text Pages using the property "Wavemaking Description" Showing 25 pages using this property. (previous 25) (next 25) A Alden Large Flume + Wave generators not yet designed Alden Small Flume + Period adjustable electronically, height adjustable mechanically Alden Wave Basin + Period adjustable electronically, height adjustable mechanically C Carderock Maneuvering & Seakeeping Basin + Irregular waves with a spectrum resembling typical ocean wave patterns with appropriate scale reductions. Carderock Tow Tank 2 + Irregular waves with a spectrum resembling typical ocean wave patterns with appropriate scale reductions Carderock Tow Tank 3 + Irregular waves with a spectrum resembling typical ocean wave patterns with appropriate scale reductions.

328

Mechanical Engineer Company Description  

E-Print Network [OSTI]

Mechanical Engineer Company Description Control Solutions Inc. is a small, dynamic, and rapidly. Position Description The Mechanical Engineer is responsible for all aspects associated with the mechanical enclosures, brackets, cabling assemblies among others. Systems include mechanisms, sensors, hydraulics, among

Kostic, Milivoje M.

329

MECHANICAL ENGINEERING Ross Schlueter  

E-Print Network [OSTI]

MECHANICAL ENGINEERING Ross Schlueter Engineering Deputy For Mechanical Engineering Russ Wells Mechanical Engineering Department Deputy ELECTRONICS, SOFTWARE & INSTRUMENTATION ENGINEERING Henrik von Der Sen Mechanical Admin. Assist. Joan Wolter Electronics Admin. Assist. Marilyn Wong Division Admin

330

ENGINEERING MECHANICS SEMINARSENGINEERING MECHANICS SEMINARS THINK COMPOSITE  

E-Print Network [OSTI]

ENGINEERING MECHANICS SEMINARSENGINEERING MECHANICS SEMINARS THINK COMPOSITE "THINK outside the box" for more competitive structural COMPOSITES Dr. Melih Papila Visiting Professor, Aero/Astro Department, Stanford University. Adv. Composites and Polymer Processing Lab., Sabanci University, Istanbul. mpapila

Ponce, V. Miguel

331

Thermal properties of fluorinated graphene  

Science Journals Connector (OSTI)

Large-scale atomistic simulations using the reactive force field approach are implemented to investigate the thermomechanical properties of fluorinated graphene (FG). A set of parameters for the reactive force field potential optimized to reproduce key quantum mechanical properties of relevant carbon-fluorine cluster systems are presented. Molecular dynamics simulations are used to investigate the thermal rippling behavior of FG and its mechanical properties and compare them with graphene, graphane and a sheet of boron nitride. The mean square value of the height fluctuations ?h2? and the height-height correlation function H(q) for different system sizes and temperatures show that FG is an unrippled system in contrast to the thermal rippling behavior of graphene. The effective Young's modulus of a flake of fluorinated graphene is obtained to be 273 N/m and 250 N/m for a flake of FG under uniaxial strain along armchair and zigzag directions, respectively.

Sandeep Kumar Singh; S. Goverapet Srinivasan; M. Neek-Amal; S. Costamagna; Adri C. T. van Duin; F. M. Peeters

2013-03-29T23:59:59.000Z

332

Micromechanical properties of silica aerogels  

Science Journals Connector (OSTI)

Aerogels are nanostructured highly porous solids that present properties which are very different from other materials i.e. extremely low densities. In this letter the mechanical properties of aerogels have been studied with a nondestructive microindentation technique. This technique enables the continuous measurement of load-displacement curves during loading and unloading cycles by using very small indentation loads (?1 mN) small enough to prevent cracking of the aerogels. The samples studied show two different types of mechanical behaviors; the low-density aerogels are elastic while the denser aerogels behave as elastoplastic materials. Youngs modulus hardness and the elastic parameter have been evaluated for these aerogel samples. Power function relationships have been found between these mechanical parameters and the aerogel densities.

M. Moner-Girona; A. Roig; E. Molins; E. Mart??nez; J. Esteve

1999-01-01T23:59:59.000Z

333

Mechanical & Biomedical Engineering  

E-Print Network [OSTI]

Mechanical & Biomedical Engineering Department BACHELOR OF SCIENCE IN MECHANICAL ENGINEERING COURSE 105 Mechanical Engineering Graphics 3 CHEM 111L College Chemistry Lab (DLN) 1 ENGL 102 English PHYS 211 Mechanics, Waves & Heat (DLN) 4 UF 100 Intellectual Foundations 3 PHYS 211L Mechanics, Waves

Barrash, Warren

334

Mechanical Engineering Graduate Student  

E-Print Network [OSTI]

......................................................................................9 Engineering Career Services ................................................................9 McMechanical Engineering Graduate Student Handbook January 2014 Department of Mechanical Engineering University of Wisconsin-Madison #12;Mechanical Engineering Web Page: http://www.engr.wisc.edu/me Graduate

Wisconsin at Madison, University of

335

Mechanical & Industrial Engineering  

E-Print Network [OSTI]

Mechanical & Industrial Engineering 1 Welcome MIE Industrial Advisory Board October 15, 2010 #12;Mechanical & Industrial Engineering 2 MIE Dorothy Adams Undergraduate/Graduate Secretary David Schmidt Associate Professor & Graduate Program Director #12;Mechanical & Industrial Engineering 3 MIE James Rinderle

Mountziaris, T. J.

336

MECHANICAL ENGINEERING UNDERGRADUATE MAJOR  

E-Print Network [OSTI]

HANDBOOK FOR MECHANICAL ENGINEERING UNDERGRADUATE MAJOR Old Dominion University Department of Mechanical Engineering Batten College of Engineering and Technology Norfolk, Virginia 23529-0247 #12;TABLE OF CONTENTS MECHANICAL ENGINEERING HANDBOOK

337

Mechanical engineering Department Seminar  

E-Print Network [OSTI]

Mechanical engineering Department Seminar Katia Bertoldi Harvard University Soft materials in response to diverse stimuli. While the mechanical attributes - such as energy absorption, stiffness and switchable functionalities. Katia Bertoldi is an Assistant Professor of Applied Mechanics at Harvard

338

Window Properties  

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

Window Properties: measurements, simulations and ratings Window Properties: measurements, simulations and ratings Determining the thermal and optical performance of window systems is essential to researchers striving to develop improved products and to window manufacturers who need to demonstrate the energy performance of their products to architects, engineers, builders, and the general public. LBNL is involved in basic research in this field, in developing software and test procedures to analyze and quantify window heat transfer and optics, and in developing standards and rating procedures. Infrared Laboratory experiments provide surface temperature maps of window products. A companion Traversing System measures air velocity and air temperatures near the surface of test specimens. The MoWiTT facility provides accurate measurements of the heat flow through complete window systems subjected to real weather conditions. MoWiTT results have been used to validate the performance of emerging technologies and research prototypes as well as to validate thermal performance models.

339

Monroe Thomas, Mechanical Technician  

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

Monroe Thomas, Mechanical Technician Print The weekend before the ALS was scheduled to start up again after the most recent shutdown, mechanical technician Monroe Thomas kept...

340

Cryogenic properties of optomechanical silica microcavities  

Science Journals Connector (OSTI)

We report the study of the optical and mechanical properties of high-Q fused silica microtoroidal resonators at cryogenic temperatures (down to 1.6 K). A thermally induced optical multistability is observed and theoretically described, originating from the reverse thermally induced optical frequency shift. Moreover the influence of structural defect states (two level fluctuators) on their mechanical properties is observed and probed at an unprecedentedly achieved low phonon number. The resulting implications for cavity optomechanics and studies of mechanical decoherence are also discussed.

O. Arcizet; R. Rivire; A. Schliesser; G. Anetsberger; T. J. Kippenberg

2009-08-12T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Mechanical & Industrial Engineering  

E-Print Network [OSTI]

Mechanical & Industrial Engineering 1 Welcome MIE Industrial Advisory Board May 5th, 2011 #12;Mechanical & Industrial Engineering 2 IAB 2010-2011 · David K. Anderson ­ Alden Research Laboratory, Inc went on for three weeks Mechanical & Industrial Engineering 6 #12;Reza Shahbazian Yassar Mechanical

Mountziaris, T. J.

342

Career Map: Mechanical Engineer  

Broader source: Energy.gov [DOE]

The Wind Program's Career Map provides job description information for Mechanical Engineer positions.

343

Mechanical Engineering Undergraduate  

E-Print Network [OSTI]

Mechanical Engineering Department Undergraduate Advising Manual for Bachelor of Science Degrees in Mechanical Engineering and Engineering Mechanics 2011-2012 - Updated April 15, 2012 #12;Johns Hopkins University ­ Department of Mechanical Engineering 2011-2012 Undergraduate Student Advising Manual Page 2

Ghosh, Somnath

344

Mechanical engineering Department Seminar  

E-Print Network [OSTI]

Mechanical engineering Department Seminar James Bird Department of Mechanical Engineering Boston ­ are discussed. James Bird is an Assistant Professor in the Mechanical Engineering Department at Boston completed post-doctoral research at MIT. His research interests include experimental fluid mechanics

345

Mechanical Engineering Undergraduate  

E-Print Network [OSTI]

Mechanical Engineering Department Undergraduate Advising Manual for Bachelor of Science Degrees in Mechanical Engineering and Engineering Mechanics 2012-2013 - Updated July 14, 2013 #12;Johns Hopkins University ­ Department of Mechanical Engineering 2012-2013 Undergraduate Student Advising Manual Page 2

Ghosh, Somnath

346

Mechanical Engineering & Thermal Group  

E-Print Network [OSTI]

Mechanical Engineering & Thermal Group The Mechanical Engineering (ME) & Thermal Group at LASP has, and ground- based mechanical systems. Instrument Design Building on decades of design experience that has evolved with the complexity of instrument design demands, LASP mechanical engineers develop advanced

Mojzsis, Stephen J.

347

Combined Quantum Mechanical and Molecular Mechanics Studies of...  

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

Mechanical and Molecular Mechanics Studies of the Electron-Transfer Reactions Involving Carbon Tetrachloride in Combined Quantum Mechanical and Molecular Mechanics Studies of the...

348

Information Theory and Statistical Mechanics  

Science Journals Connector (OSTI)

Information theory provides a constructive criterion for setting up probability distributions on the basis of partial knowledge, and leads to a type of statistical inference which is called the maximum-entropy estimate. It is the least biased estimate possible on the given information; i.e., it is maximally noncommittal with regard to missing information. If one considers statistical mechanics as a form of statistical inference rather than as a physical theory, it is found that the usual computational rules, starting with the determination of the partition function, are an immediate consequence of the maximum-entropy principle. In the resulting "subjective statistical mechanics," the usual rules are thus justified independently of any physical argument, and in particular independently of experimental verification; whether or not the results agree with experiment, they still represent the best estimates that could have been made on the basis of the information available.It is concluded that statistical mechanics need not be regarded as a physical theory dependent for its validity on the truth of additional assumptions not contained in the laws of mechanics (such as ergodicity, metric transitivity, equal a priori probabilities, etc.). Furthermore, it is possible to maintain a sharp distinction between its physical and statistical aspects. The former consists only of the correct enumeration of the states of a system and their properties; the latter is a straightforward example of statistical inference.

E. T. Jaynes

1957-05-15T23:59:59.000Z

349

Sandia National Laboratories: Mechanical Testing  

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

EnergyNuclear Energy Systems Laboratory (NESL) Brayton LabMechanical Testing Mechanical Testing Mechanical Testing Overview Mechanical 1-2 (2008). Standard Test Methods for...

350

NSLS Mechanical Tech  

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

Mechanical Tech Mechanical Tech The Mechanical Technician group is supervised by Robert Scheuerer and consists of Mechanical Technicians with fabrication/machining, assembly, installation, and alignment/surveying skills. This group also serves as an interface to Central Fabrication Services when more complex or larger fabrication efforts are needed. The Mechanical Tech group is responsible for fabricating, installing, aligning, and troubleshooting the mechanical hardware used on NSLS and SDL accelerators, front ends, and User beamlines, often starting solely from Mechanical Design group drawings or CAD files. The Mechanical Tech Group is responsible for the fabrication, assembly and installation of components at the NSLS. These components include all mechanical assemblies and RF cavities. Another part of their job is to

351

24.111 Philosophy of Quantum Mechanics, Spring 2002  

E-Print Network [OSTI]

Quantum mechanics is said to describe a world in which physical objects often lack "definite" properties, indeterminism creeps in at the point of "observation," ordinary logic does not apply, and distant events are perfectly ...

Hall, Edward J. (Edward Jonathon), 1966-

352

Production, Characterization, and Mechanical Behavior of Cementitious Materials Incorporating Carbon Nanofibers  

E-Print Network [OSTI]

Carbon nanotubes (CNTs) and carbon nanofirbers (CNFs) have excellent properties (mechanical, electrical, magnetic, etc.), which can make them effective nanoreinforcements for improving the properties of materials. The incorporation of CNT/Fs in a...

Yazdanbakhsh, Ardavan

2012-10-19T23:59:59.000Z

353

Compliant mechanism learning toolkit  

E-Print Network [OSTI]

This thesis concerns a toolkit designed to assist in learning the behavior of complaint mechanisms. In the design of complaint mechanisms, increasingly complicated designs behave in ways that are harder to intuitively ...

Allard, Nicholas (Nicholas A.)

2006-01-01T23:59:59.000Z

354

Programmable Mechanical Metamaterials  

E-Print Network [OSTI]

We create mechanical metamaterials whose response to uniaxial compression can be programmed by lateral confinement, allowing monotonic, non-monotonic and hysteretic behavior. These functionalities arise from a broken rotational symmetry which causes highly nonlinear coupling of deformations along the two primary axes of these metamaterials. We introduce a soft mechanism model which captures the programmable mechanics, and outline a general design strategy for confined mechanical metamaterials. Finally, we show how inhomogeneous confinement can be explored to create multi stability and giant hysteresis.

Bastiaan Florijn; Corentin Coulais; Martin van Hecke

2014-07-17T23:59:59.000Z

355

Mechanical & Industrial Engineering  

E-Print Network [OSTI]

Mechanical & Industrial Engineering Mario A. Rotea Professor and Department Head #12;2Mechanical & Industrial Engineering Outline · Undergraduate Degree Programs · Graduate Degree Programs · The Faculty · The Research · Summary #12;3Mechanical & Industrial Engineering Undergraduate Programs ­ BSME & BSIE 0 20 40 60

Mountziaris, T. J.

356

Mechanical engineering Department Seminar  

E-Print Network [OSTI]

Mechanical engineering Department Seminar Shuodao Wang Postdoctoral Fellow University of Illinois, Urbana-Champaign Mechanical Design and Fabrication Techniques for Bio-Electronic Systems 11:00 AM Friday that bridge this gap in mechanics and form will create new opportunities in bio-inspired and bio

Lin, Xi

357

Mechanical and Aerospace Engineering  

E-Print Network [OSTI]

Mechanical and Aerospace Engineering Abstract Solid materials used in energy conversion and storage that couples the mechanical and chemical (or electrochemical) fields in solids via the use of stress-chemo- mechanical theory, two examples of practical interest will be discussed, namely, solid oxide fuel cells

358

Mechanical engineering Department Seminar  

E-Print Network [OSTI]

Mechanical engineering Department Seminar Maureen Lynch Postdoctoral Fellow Cornell University Mechanical Loading Decreases Osteolysis and Tumor Formation via Effects on Bone Remodeling 11:00 AM Friday to mechanical stimuli in the skeleton, yet the role of biomechanical loading remains poorly characterized

Lin, Xi

359

Victor Yakhot Mechanical Engineering  

E-Print Network [OSTI]

to flows of strongly non-linear fluids relevant for mechanical engineering, polymers and bio-fluid dynamicsVictor Yakhot Mechanical Engineering UniversalReynoldsNumberofTransition,Renormalizationand Mechanical Engineering 11 AM Friday, October 31st Room 245, 110 Cummington Mall Refreshments served at 10

Lin, Xi

360

WOOD PROPERTIES AND THEIR VARIATIONS WITHIN THE TREE STEM OF LESSER-USED SPECIES OF TROPICAL  

E-Print Network [OSTI]

WOOD PROPERTIES AND THEIR VARIATIONS WITHIN THE TREE STEM OF LESSER-USED SPECIES OF TROPICAL to utilization about the species. This paper examines physical and mechanical properties of wood. There was an overall increase of wood's physical and mechanical properties from the breast height to the top

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Development of ultrananocrystalline diamond (UNCD) coatings for multipurpose mechanical pump seals.  

SciTech Connect (OSTI)

The reliability and performance of silicon carbide (SiC) shaft seals on multipurpose mechanical pumps are improved by applying a protective coating of ultrananocrystalline diamond (UNCD). UNCD exhibits extreme hardness (97 GPa), low friction (0.1 in air) and outstanding chemical resistance. Consequently, the application of UNCD coatings to multipurpose mechanical pump seals can reduce frictional energy losses and eliminate the downtime and hazardous emissions from seal failure and leakage. In this study, UNCD films were prepared by microwave plasma chemical vapor deposition utilizing an argon/methane gas mixture. Prior to coating, the SiC seals were subjected to mechanical polishing using different grades of micron-sized diamond powder to produce different starting surfaces with well-controlled surface roughnesses. Following this roughening process, the seals were seeded by mechanical abrasion with diamond nanopowder, and subsequently coated with UNCD. The coated seals were subjected to dynamic wear testing performed at 3600 RPM and 100 psi for up to 10 days during which the seals were periodically removed and inspected. The UNCD-coated seals were examined using Raman microanalysis, scanning electron microscopy, optical profilometry, and adhesion testing before and after the wear testing. These analyses revealed that delamination of the UNCD films was prevented when the initial SiC seal surface had an initial roughness >0.1 {micro}m. In addition, the UNCD surfaces showed no measurable wear as compared to approximately 0.2 {micro}m of wear for the untreated SiC surfaces.

Kovalchenko, A. M.; Elam, J. W.; Erdemir, A.; Carlisle, J. A.; Auciello, O.; Libera, J. A.; Pellin, M. J.; Gruen, D. M.; Hryn, J. N. (Materials Science Division); (Georgia Inst. of Tech.)

2011-01-01T23:59:59.000Z

362

Determining the mechanical properties of equine laminar corium tissue  

E-Print Network [OSTI]

of the modulus of the two samples in section 1 (1040-U-1) lie within the range of values observed for the seclion with four hoof samples of section 2 (H1040-U-2&. 20 7 DO 600 H4028t E=l, 950. 6 psl. Sld. =20. 7 psi, R"2M. 992 500 M 0 40tl 8- H4024t Esl..., 484. 1 psi, Sld. =26. 1 Psi, R"2s0. 985 200 100 H4D22: E=746. 0 psi, Sjdsd. 2 psi, R"2=0. 997 0 Ii O. l tl. s H4021t E=682. 8 psj, Sld. =5. 7 psi, R"2s0. 997 tj 4 UTIIAIN (IN/IN) 0 lj Figure 5-b. Hoof section H10402. The effects of sample...

Hallab, Nadim James

1991-01-01T23:59:59.000Z

363

The normal basilar artery: structural properties and mechanical behavior  

E-Print Network [OSTI]

male White New Zealand specific pathogen free rabbits underwent cyclic pressurization tests at in vivo conditions and controlled levels of myogenic tone. Sections of basilar arteries were imaged for collagen fiber orientation at 0, 40 and 80 mmHg...

Wicker, Bethany Kay

2009-05-15T23:59:59.000Z

364

Hydration Control of the Mechanical and Dynamical Properties of Cellulose  

Science Journals Connector (OSTI)

Loukas Petridis *, Hugh M. ONeill , Mariah Johnsen ?, Bingxin Fan ?, Roland Schulz #, Eugene Mamontov ?, Janna Maranas ?, Paul Langan ?, and Jeremy C. Smith # ... sucrofermentans (ATCC 700178) in minimal media and purification of cellulose has been described previously. ... In vivo generated deuterated bacterial cellulose, cultivated from 100% deuterated glycerol in D2O medium, was analyzed for deuterium incorporation by ionic liq. ...

Loukas Petridis; Hugh M. ONeill; Mariah Johnsen; Bingxin Fan; Roland Schulz; Eugene Mamontov; Janna Maranas; Paul Langan; Jeremy C. Smith

2014-10-17T23:59:59.000Z

365

The Mechanical and Tribological Properties or Ion Implanted Ceramics  

E-Print Network [OSTI]

by Wei et al (1987a. b) has shown that ion beam mixing of some ceramic discs with Ti, Ni or Co can result in reduced coefficients of friction at 800C in a simulated diesel exhaust environment. 1.1.3 Oxidation and Corrosion Surface films have long... the nuclear cross section will begin to dominate, the probability of scattering increases, and the ion will lose more of its energy in elastic atomic collisions. The collisions may result in "knock-on" of the target atoms, a process which requires...

Bull, Stephen John

1988-06-17T23:59:59.000Z

366

Structural and Mechanical Properties of Klebsiella pneumoniae Type 3 Fimbriae  

Science Journals Connector (OSTI)

...images were processed using two commercial software packages, Photoshop (Adobe Systems, Inc., San Jose, CA) and AutoCAD (Autodesk, Inc., San Rafael, CA). Photoshop was used to cut 506 subpictures (1,715 by 436 pixels in area) from 50 raw pictures...

Feng-Jung Chen; Chia-Han Chan; Ying-Jung Huang; Kuo-Liang Liu; Hwei-Ling Peng; Hwan-You Chang; Gunn-Guang Liou; Tri-Rung Yew; Cheng-Hsien Liu; Ken Y. Hsu; Long Hsu

2011-01-14T23:59:59.000Z

367

Bioinspired Cellular Structures: Additive Manufacturing and Mechanical Properties  

Science Journals Connector (OSTI)

Biological materials (e.g., wood, trabecular bone, marine skeletons) rely heavily on the use of cellular architecture, which provides several advantages. (1) The resulting structures can bear the variety of real...

J. Stampfl; H. E. Pettermann

2011-01-01T23:59:59.000Z

368

Influence of defects on thermal and mechanical properties of metals  

E-Print Network [OSTI]

of theories of melting with respect to defects. We studied the melting and freezing process for a model system of copper with and without defects. We studied point defects (1, 2, 4, 8 vacancies and 1, 2, 4, 8 interstitials), line defects (edge dislocation...

Kamani, Sandeep Kumar

2009-05-15T23:59:59.000Z

369

Microfluidic devices for analysis of red blood cell mechanical properties  

E-Print Network [OSTI]

Decreased deformability of human red blood cells (RBCs) is both a cause of disease and biomarker for disease (1). To traverse blood capillaries, the biconcave disk-shaped RBC must deform dramatically, since the diameter ...

Bow, Hansen Chang

2010-01-01T23:59:59.000Z

370

Mechanical and Electrical Properties of Modified Graphene Devices  

E-Print Network [OSTI]

Finally, wafers are rinsed by IPA (isopropyl alcohol) andIsopropyl Alcohol ( MIBK/IPA) (1:3) solution for 65 seconds,by 60 seconds rinsing in IPA. (3) Metal deposition and lift

ZHANG, HANG

2012-01-01T23:59:59.000Z

371

Analysis of radiation mechanism and polarizing properties of metamaterials  

E-Print Network [OSTI]

(cont.) isotropic permeability. The characteristics used as a basis for comparison are: 1. Leakage of light (transmittance) through a pair of crossed-polarizers, and 2. Fresnel coefficients of a single polarizer. The ...

Nikku, Madhusudhan, 1980-

2004-01-01T23:59:59.000Z

372

Mechanical properties and fabric of the Punchbowl fault zone, California  

E-Print Network [OSTI]

, and 50 to 125'C, in the presence of pore fluids. The fault zone and surrounding rock consists of (1) the main gouge zone, separated from (2) the undeformed host-rack, by (3) an irregular zone of damaged host-rock. The subsidiary fault fabric... orientations of discrete shear surfaces within the gouge 52 14 Photographs of subsidiary faults within the damaged zone of the Punchbowl Formation. . . . . . 57 15 Photomicrographs showing the progressive increase in deformation of the Punchbowl Formation...

Chester, Frederick Michael

2012-06-07T23:59:59.000Z

373

Mechanical properties of normotensive and hypertensive female rat carotid arteries  

E-Print Network [OSTI]

filament involved in muscle contraction, forms the thick filament. No slip condition ? boundary condition enforcing the theory that the fluid layer in direct contact with a surface is moving with the same velocity as the surface. Opening Angle Tests... methodology. Chapter II presents biomechanics theory that is fundamental to device design, experimental protocols, and quantitative analysis of results. Chapter III describes two systems fabricated to answer questions posed in response to the above stated...

Smith, Katherine Elizabeth

2012-06-07T23:59:59.000Z

374

Measurements of electrical and mechanical properties of aluminum composite cryoconductors  

E-Print Network [OSTI]

developed by Alcoa for high temperature applicationsi. To test the formability of the new matrix material with the pure aluminum filaments, Oberly and Ho' developed the following study based on requirements for a pulsed energy storage device. Pulsed..., relevant literature covering development studies on the Alcoa composite cryoconductor is reviewed below. The following summaries cover the period from 1990 to the current year (1993). In the 1990 publication of Advances in Cryogenic Engineering...

Sundby, Paul C.

1994-01-01T23:59:59.000Z

375

MECHANICAL PROPERTY-MICROSTRUCTURAL RELATIONSHIPS IN ABALONE SHELL*  

E-Print Network [OSTI]

of component phases (e.g., metal and ceramic matrix composites); and (iii) tape casting and infiltration (e such as cermet (ceramic-metal) and cerpoly (ceramic-polymer) composites. INTRODUCTION In the quest to develop MPa-m"1 2 ; these values are comparablewith or better than most "high technology" ceramic materials

Aksay, Ilhan A.

376

Microscopic modulation of mechanical properties in transparent insect wings  

SciTech Connect (OSTI)

We report on the measurement of local friction and adhesion of transparent insect wings using an atomic force microscope cantilever down to nanometre length scales. We observe that the wing-surface is decorated with 10??m long and 2??m wide islands that have higher topographic height. The friction on the islands is two orders of magnitude higher than the back-ground while the adhesion on the islands is smaller. Furthermore, the high islands are decorated with ordered nano-wire-like structures while the background is full of randomly distributed granular nano-particles. Coherent optical diffraction through the wings produce a stable diffraction pattern revealing a quasi-periodic organization of the high islands over the entire wing. This suggests a long-range order in the modulation of friction and adhesion which is directly correlated with the topography. The measurements unravel novel functional design of complex wing surface and could find application in miniature biomimetic devices.

Arora, Ashima; Kumar, Pramod; Bhagavathi, Jithin; Singh, Kamal P., E-mail: kpsingh@iisermohali.ac.in; Sheet, Goutam, E-mail: goutam@iisermohali.ac.in [Department of Physical Sciences, Indian Institute of Science Education and Research, Mohali, Punjab 140306 (India)

2014-02-10T23:59:59.000Z

377

Mechanical properties of collagen-based scaffolds for tissue regeneration  

E-Print Network [OSTI]

Collagen-glycosaminoglycan (CG) scaffolds for the regeneration of skin and nerve have previously been fabricated by freeze-drying a slurry containing a co-precipitate of collagen and glycosaminoglycan. Recently, mineralized ...

Kanungo, Biraja Prasad, 1980-

2009-01-01T23:59:59.000Z

378

Experimental study of elastoplastic mechanical properties of coke drum materials.  

E-Print Network [OSTI]

??Coke drums are vertical pressure vessels used in the delayed coking process in petroleum refineries. Significant temperature variation during the delayed coking process causes the (more)

Chen, Jie

2010-01-01T23:59:59.000Z

379

Mechanical Properties and Oxidation Behaviour of Electroconductive Ceramic Composites  

E-Print Network [OSTI]

obtained by Hot Pressing (HP). In view of the results, the high performance composite grade SiC-HfB2 has for industrial furnaces, aerospace parts... The studies are mainly concerned with the SiC-TiC and SiC- TiB2 pressed at 200 MPa and the crude cylinder was hot isostatically pressed within a silica container at 1850

Paris-Sud XI, Université de

380

Tailoring Mechanical Properties of Aerogels for Aerospace Applications  

Science Journals Connector (OSTI)

This paper first presents a brief review of the literature on methods of silica aerogel reinforcement and then discusses our recent activities in improving not only the strength but also the elastic response of polymer-reinforced silica aerogels. ... silica aerogel; polymer cross-linking; nanoporous materials; flexible aerogels; sol?gel; conformal coatings; skeletal density ... Wet chemistry methods such as solgel provide a facile means of preparing coatings with controlled surface chemistry and architecture. ...

Jason P. Randall; Mary Ann B. Meador; Sadhan C. Jana

2011-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Structure, Dynamics, and Mechanical Properties in Soft Things!  

E-Print Network [OSTI]

and includes false identifications · reduce standard deviation of pixel measurement to better than 1/10 pixel ·Networks ·Driven Dynamics and Effective Temperature ·Interface with Biology ­ are there guiding principles objective detector pinhole in focus out of focus Confocal Microscopy True 3-dimensional imaging Rejects out

Ronis, David M.

382

Mechanical Properties of a Metal Powder-Loaded Polyurethane Foam  

SciTech Connect (OSTI)

Quasi-static compression tests have been performed on polyurethane foam specimens. The modulus of the foam exhibited a power-law dependence with respect to density of the form: E* {proportional_to} {rho}*{sup n}, where n = 1.7. The modulus data is well described by a simple geometric model (attributed to the work of Gibson and Ashby) for closed-cell foam in which the stiffness of the foam is governed by the flexure of the cell struts and cell walls. The compressive strength of the foam is also found to follow a power-law behavior with respect to foam density. In this instance, Euler buckling is used to rationalize the density dependence. The modulus of the polyurethane foam was modified by addition of a gas atomized, spherical aluminum powder. Additions of 30 and 50 weight percent of the powder significantly increased the foam modulus. However, there were only slight increases in modulus with 5 and 10 weight percent additions of the metal powder. Strength was also slightly increased at high loading fractions of powder. This increase in modulus and strength could be predicted by combining the above geometric model with a well-known model describing the effect on modulus of a rigid dispersoid in a compliant matrix.

C. L. Neuschwanger; L. L. Whinnery; S. H. Goods

1999-04-01T23:59:59.000Z

383

ORIGINAL PAPER Mechanical and structural properties of in vitro  

E-Print Network [OSTI]

. Rammensee ? P. A. Janmey ? A. R. Bausch Received: 13 November 2006 / Revised: 24 January 2007 / Accepted: 29 a function S. Rammensee Á A. R. Bausch (&) Biophysik (E22), Technische Universitaet Muenchen, James vimentin it has been shown that subunits can glide axially against each other (Guzman et al. 2006), thus

Bausch, Andreas

384

Reconstruction of Sedimentary Rock Based on Mechanical Properties  

E-Print Network [OSTI]

Diagenesis transforms an unconsolidated loose sed- imentOur emphasis is on unconsolidated sand and sandstone. Thesedi- mentary rock: unconsolidated sand and sandstone. The

Jin, Guodong; Patzek, Tad W.; Silin, Dmitry B.

2008-01-01T23:59:59.000Z

385

On-Machine Sensors to Measure Paper Mechanical Properties  

E-Print Network [OSTI]

. REFERENCES I. Baum, G.A., Brerman, D.C., and Habeger, C.C., Tappi Journal, "Orthotropic Elastic Constants of Paper," 64 (8):97(1981). 2. Hersh, H.N., "Energy and Material Flows in the Production of Pulp and Paper," Argorme National Laboratory, ANL.... REFERENCES I. Baum, G.A., Brerman, D.C., and Habeger, C.C., Tappi Journal, "Orthotropic Elastic Constants of Paper," 64 (8):97(1981). 2. Hersh, H.N., "Energy and Material Flows in the Production of Pulp and Paper," Argorme National Laboratory, ANL...

Hall, M. S.

386

Mechanical Properties and Radiation Tolerance of Metallic Multilayers  

E-Print Network [OSTI]

across the interface between lattice A and lattice B beginning at point S. Vector p f is an arbitrary interface vector from the origin O terminating at S. (b) The Burgers circuit in (a) constructed in a coherent reference lattice. If lattice A... is obtained from the reference lattice through a homogeneous deformation FA and lattice B is similarly constructed using FB, then the Burgers circuit has the closure failure 1 1( A B )B F F? ?= ?f pf , dashed arrow [15, 18]. ...................... 12 xii...

Li, Nan

2011-08-08T23:59:59.000Z

387

Mechanisms and modeling of single-event upset  

SciTech Connect (OSTI)

The basic mechanisms of single-event upset are reviewed, including charge collection in silicon junctions and transistors, and properties of single-event upset in CMOS static random access memory (SRAM) cells. The mechanisms are illustrated through the use of three-dimensional device and circuit simulations. Technology trends and implications for commercial devices are discussed.

Dodd, Paul E.

1998-10-12T23:59:59.000Z

388

Mechanical seal assembly  

DOE Patents [OSTI]

An improved mechanical seal assembly is provided for sealing rotating shafts with respect to their shaft housings, wherein the rotating shafts are subject to substantial axial vibrations. The mechanical seal assembly generally includes a rotating sealing ring fixed to the shaft, a non-rotating sealing ring adjacent to and in close contact with the rotating sealing ring for forming an annular seal about the shaft, and a mechanical diode element that applies a biasing force to the non-rotating sealing ring by means of hemispherical joint. The alignment of the mechanical diode with respect to the sealing rings is maintained by a series of linear bearings positioned axially along a desired length of the mechanical diode. Alternative embodiments include mechanical or hydraulic amplification components for amplifying axial displacement of the non-rotating sealing ring and transferring it to the mechanical diode.

Kotlyar, Oleg M. (Salt Lake City, UT)

2001-01-01T23:59:59.000Z

389

Mechanical seal assembly  

DOE Patents [OSTI]

An improved mechanical seal assembly is provided for sealing rotating shafts with respect to their shaft housings, wherein the rotating shafts are subject to substantial axial vibrations. The mechanical seal assembly generally includes a rotating sealing ring fixed to the shaft, a non-rotating sealing ring adjacent to and in close contact with the rotating sealing ring for forming an annular seal about the shaft, and a mechanical diode element that applies a biasing force to the non-rotating sealing ring by means of hemispherical joint. The alignment of the mechanical diode with respect to the sealing rings is maintained by a series of linear bearings positioned axially along a desired length of the mechanical diode. Alternative embodiments include mechanical or hydraulic amplification components for amplifying axial displacement of the non-rotating sealing ring and transfering it to the mechanical diode.

Kotlyar, Oleg M. (Salt Lake City, UT)

2002-01-01T23:59:59.000Z

390

Ice mechanics and risks to offshore structures  

SciTech Connect (OSTI)

This volume brings together the results of all salient research development in ice engineering, from smaller scale to full size tests on ice strength and ice mechanics which is essential criteria for the design of safe, cost effective structures. Much of the data has been released from confidential industry files and thus allows, for the first time, a full appraisal of the subject. Contents include - Types and Distribution of Ice, Mechanical Properties, Measurements of Ice-Structure Interaction, and Analysis of Ice Failure and Design Ice Loads. This work is completed with a full literary review and subject index.

Sanderson, T.J.O.

1988-01-01T23:59:59.000Z

391

Chapter 3 Property Law  

Science Journals Connector (OSTI)

This chapter examines the economics of property rights and property law. It shows how the economics of property rights can be used to understand fundamental features of property law and related extra-legal institutions. The chapter examines both the rationale for legal doctrine, and the effects of legal doctrine regarding the exercise, enforcement, and transfer of rights. It also examines various property rights regimes including open access, private ownership, common property, and state property. The guiding questions are: How are property rights established? What explains the variation in the types of property rights? What governs the use and transfer of rights? And, how are property rights enforced? In answering these questions we argue that property rights and property law can be best understood as a system of societal rules designed to maximize social wealth. They do this by creating incentives for people to maintain and invest in assets, which leads to specialization and trade.

Dean Lueck; Thomas J. Miceli

2007-01-01T23:59:59.000Z

392

Mechanics of Funding matrix  

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

FUNDING MECHANISMS FUNDING MECHANISMS Funding Mechanism Advantages Disadvantages Comments 1. From Doe to regional organizations * * Facilitates a broad, regional approach to planning and implementation that enhances consistency and uniformity * * Especially beneficial for new programs where early planning is needed * * Simplifies communication for DOE to have only one point of contact for information and discussion * * Cooperative agreement mechanism has proven relatively simple to administer * * Approach would require modification for Tribes * * Would also require that funding be provided to individual States to enable them to participate in the process, since planning authority and responsibility rests with the individual State * * Differs from OCRWM approach to 180(c) funding * * Introduces another layer of

393

Technology Partnering Mechanisms  

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

expand a business with INL technologies, or require business support our Technology Transfer team is available to discuss the following contractual mechanisms: Cooperative...

394

PEVK Domain of Titin: An Entropic Spring with Actin-Binding Properties  

E-Print Network [OSTI]

as an entropic spring with the properties of a random coil exhibiting mechanical conforma- tions of differentPEVK Domain of Titin: An Entropic Spring with Actin-Binding Properties Wolfgang A. Linke,*,1

Fernandez, Julio M.

395

NETL: Available Property  

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

Available Property Business Forms Contacts Buying Property from NETL NETL offers surplus equipment for sale to the public and provides opportunities for colleges and universities...

396

Fundamental mechanisms in flue gas conditioning  

SciTech Connect (OSTI)

The overall goal of this research project is to formulate a mathematical model of flue gas conditioning. This model will be based on an understanding of why ask properties, such as cohesivity and resistivity, are changed by conditioning. Such a model could serve as a component of the performance models of particulate control devices where flue gas conditioning is used. There are two specific objectives of this research project, which divide the planned research into two main parts. One part of the project is designed to determine how ash particles are modified by interactions with sorbent injection processes and to describe the mechanisms by which these interactions affect fine particle collection. The objective of the other part of the project is to identify the mechanisms by which conditioning agents, including chemically active compounds, modify the key properties of fine fly ash particles.

Bush, P.V.; Snyder, T.R.

1992-01-09T23:59:59.000Z

397

Boston University Department of Mechanical Engineering ME 303 Fluid Mechanics  

E-Print Network [OSTI]

Boston University Department of Mechanical Engineering ME 303 ­ Fluid Mechanics Fall 2011 Class: EK301 Engineering Mechanics Course Textbook: Fundamentals of Fluid Mechanics, 6th ed., Munson B. Reference Texts: Fluid Mechanics, Landau and Lifshitz, Vol. 6 Fluid Mechanics, Y. Cengel and J. Cimbala

398

Mechanical Properties, Thermal Stability and Radiation Damage of Ferritic Steels Processed by Thermal Mechanical Treatments  

E-Print Network [OSTI]

into a material by extrusion through a channel of constant cross section that contains an abrupt angle. The work presented in this dissertation is an attempt to apply ECAE to reactor steels of interest-namely T91 and 12Cr ODS. T91 (modified 9Cr-1Mo steel...

Song, Miao

2014-08-04T23:59:59.000Z

399

Synthesis and Properties of Biodegradable Poly(vinyl alcohol)/Organo-nanoclay Bionanocomposites  

Science Journals Connector (OSTI)

Biodegradable nanocomposites comprising of biodegradable polymers and bioactive organically modified layered silicates commonly reveal extremely enhanced mechanical and various other properties when compared to t...

Shadpour Mallakpour; Mohammad Dinari

2012-09-01T23:59:59.000Z

400

Structure and Properties of Nanoclay Reinforced Polymer Films, Fibers and Nonwovens.  

E-Print Network [OSTI]

??In this research, influence of different levels of Closite Na+ additives on the microstructure, morphology and mechanical properties of polymer products was studied. Importance was (more)

Hegde, Raghavendra Ratnakar

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Fracture properties of natural rubber filled with hybrid carbon black/nanoclay  

Science Journals Connector (OSTI)

Hybrid carbon black (CB) and nanoclay (NC) in a rubber matrix have provided superior mechanical performances over conventional composites. Yet the fracture and fatigue properties have...

Yuanbo Liu; Li Li; Qi Wang; Xin Zhang

2011-09-01T23:59:59.000Z

402

Mechanical & Aerospace Engineering  

E-Print Network [OSTI]

, and nuclear energy. She is a member of the American Society of Mechanical Engineers (ASME), Fluids EngineeringMechanical & Aerospace Engineering Interfacial flows are multi-material flows comprised of two of the interface between the fluids and the interface physics (like surface tension) needs to be predicted as part

403

MECHANICAL ENGINEERING Program of Study  

E-Print Network [OSTI]

MECHANICAL ENGINEERING Program of Study Correspondence The Department of Mechanical Engineering offers graduate programs in the fields of thermal science and engineering mechanics. Current areas of research activity include Biomedical Engineering, Biomimetics, Composite Materials, Computational Mechanics

Thomas, Andrew

404

Integrated Mechanical & Electrical Engineering (IMEE)  

E-Print Network [OSTI]

Integrated Mechanical & Electrical Engineering (IMEE) Department of Electronic & Electrical Engineering and Department of Mechanical Engineering #12;Graduates able to work in both mechanical of Mechanical Engineers (IMechE) n Develop essential engineering skills through extensive project work n Enhance

Burton, Geoffrey R.

405

1/N expansion in noncommutative quantum mechanics  

SciTech Connect (OSTI)

We study the 1/N expansion in noncommutative quantum mechanics for the anharmonic and Coulombian potentials. The expansion for the anharmonic oscillator presented good convergence properties, but for the Coulombian potential, we found a divergent large N expansion when using the usual noncommutative generalization of the potential. We proposed a modified version of the noncommutative Coulombian potential which provides a well-behaved 1/N expansion.

Ferrari, A. F. [Universidade Federal do ABC, Centro de Ciencias Naturais e Humanas, Rua Santa Adelia, 166, 09210-170, Santo Andre, SP (Brazil); Gomes, M.; Stechhahn, C. A. [Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal 66318, 05315-970, Sao Paulo - SP (Brazil)

2010-08-15T23:59:59.000Z

406

Mechanical code comparator  

DOE Patents [OSTI]

A new class of mechanical code comparators is described which have broad potential for application in safety, surety, and security applications. These devices can be implemented as micro-scale electromechanical systems that isolate a secure or otherwise controlled device until an access code is entered. This access code is converted into a series of mechanical inputs to the mechanical code comparator, which compares the access code to a pre-input combination, entered previously into the mechanical code comparator by an operator at the system security control point. These devices provide extremely high levels of robust security. Being totally mechanical in operation, an access control system properly based on such devices cannot be circumvented by software attack alone.

Peter, Frank J. (Albuquerque, NM); Dalton, Larry J. (Bernalillo, NM); Plummer, David W. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

407

Structure and properties of polypropylene-nanoclay composites  

Science Journals Connector (OSTI)

The structure, morphology and mechanical properties of polypropylene-nanoclay composites containing 1 to15wt.% nanoclay was investigated. Combination of wide-angle x ... for samples with up to 2wt.% nanoclay ad...

Raghavendra R. Hegde; Gajanan S. Bhat; Joseph E. Spruiell

2013-11-01T23:59:59.000Z

408

Structural Characterization, Manipulation, and Properties of Graphene Membranes  

E-Print Network [OSTI]

hindering fundamental understanding of the electronic andvarious fundamental properties of graphene. 1.1 Electronicfundamental two- dimensional interatomic interactions, but it has ramifications for a host of mechanical applications (as well as electronic

Kim, Kwanpyo

2012-01-01T23:59:59.000Z

409

Accelerated Characterization of Polymer Properties  

SciTech Connect (OSTI)

This report describes the efforts to develop a suite of microanalysis techniques that can rapidly measure a variety of polymer properties of industrial importance, including thermal, photo-oxidative, and color stability; as well as ductility, viscosity, and mechanical and antistatic properties. Additional goals of the project were to direct the development of these techniques toward simultaneous measurements of multiple polymer samples of small size in real time using non-destructive and/or parallel or rapid sequential measurements, to develop microcompounding techniques for preparing polymers with additives, and to demonstrate that samples prepared in the microcompounder could be analyzed directly or used in rapid off-line measurements. These enabling technologies are the crucial precursors to the development of high-throughput screening (HTS) methodologies for the polymer additives industry whereby the rate of development of new additives and polymer formulations can be greatly accelerated.

R. Wroczynski; l. Brewer; D. Buckley; M. Burrell; R. Potyrailo

2003-07-30T23:59:59.000Z

410

Role of Chemical-Mechanical Energies in Understanding Structure and  

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

Chemical-Mechanical Energies in Understanding Structure and Chemical-Mechanical Energies in Understanding Structure and Properties of Aged and Degraded Membranes Title Role of Chemical-Mechanical Energies in Understanding Structure and Properties of Aged and Degraded Membranes Publication Type Journal Article Year of Publication 2013 Authors Kusoglu, Ahmet, and Adam Z. Weber Journal ECS Transactions Volume 50 Issue 2 Pagination 961 - 965 Date Published 03/2013 ISSN 1938-6737 Abstract Polymer fuel-cell membranes are the core component of fuel-cells having multiple functionalities including water absorption, ionic conductivity, and mechanical support. All these functionalities are correlated via the membrane nanostructure and chemical properties. This study aims at investigating the changes in the structure-uptake relationship due to membrane degradation and ageing. We show that, after in-situ chemical degradation (i.e., OCV holds), the membrane's water uptake and water-domain spacing both decrease compared to a fresh membrane. In addition, the MEA manufacturing process is also found to alter the membrane's nanostructure and uptake behavior, which suggests that changes in the properties of bare membranes during processing and cell operation must be accounted for when analyzing and modeling cell performance. The experimental data is evaluated using an energy-balance approach to examine the correlations among domain spacing, water content, and mechanical properties for degraded membranes.

411

Mechanics of graded wrinkling  

E-Print Network [OSTI]

The properties of a surface depend on the inherent material and the surface topography. Nature uses surface texture as a means to impact different surface behavior such as cleanliness, adhesion control, drag reduction, ...

Raayai Ardakani, Shabnam

2013-01-01T23:59:59.000Z

412

Rotary mechanical latch  

DOE Patents [OSTI]

A rotary mechanical latch for positive latching and unlatching of a rotary device with a latchable rotating assembly having a latching gear that can be driven to latched and unlatched states by a drive mechanism such as an electric motor. A cam arm affixed to the latching gear interfaces with leading and trailing latch cams affixed to a flange within the drive mechanism. The interaction of the cam arm with leading and trailing latch cams prevents rotation of the rotating assembly by external forces such as those due to vibration or tampering.

Spletzer, Barry L.; Martinez, Michael A.; Marron, Lisa C.

2012-11-13T23:59:59.000Z

413

Counter Current Multiplier Mechanism  

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

Counter Current Multiplier Mechanism Counter Current Multiplier Mechanism Name: Stephen Location: N/A Country: N/A Date: N/A Question: Can you please explain to me the counter-current multiplier mechanism. I understand that cholride and sodium ions are filtered out of the ascending loop of Henle into the interstial fluid, however, I'm not sure exactly what happens from there and how this effects osmotic pressure gradients in the nephron. Any help would be greatly appriciated. Replies: This mechanism is very complex when it comes to writing a response. You have to have a strong background in osmotic pressure understanding and the anatomy of the kidney. It involves the cortex, outer and inner medula in relationship to the vasa recta, interstitial fluids at two points, the loop of Henle and the collecting duct. The size of the tubes and the position in relations to the cortex and medulla is an essential part. I can suggest some references.

414

Contaminant-Generation Mechanisms  

Science Journals Connector (OSTI)

In the last chapter, the areas where contaminants are generated were discussed. Knowing the location of contaminant generation is helpful in controlling that contamination, but understanding the mechanisms is ...

Alvin Lieberman

1992-01-01T23:59:59.000Z

415

Mechanical & Aerospace Engineering  

E-Print Network [OSTI]

Mechanical & Aerospace Engineering This presentation will address the development and transition of advanced structural health management (SHM) technologies from the perspective of understanding and the importance of understanding this role to increase the likelihood for transition of new technologies

416

Mechanical engineering Department Seminar  

E-Print Network [OSTI]

people trained from both perspectives can result in innovative solutions. At Fraunhofer CMI ­ coMechanical engineering Department Seminar Alexis Sauer-Budge Senior Research Scientist, Fraunhofer CMI Adjunct Research Assistant Professor, BME, Boston University Innovations at the intersection

417

Syngas Oxidation Mechanism  

Science Journals Connector (OSTI)

A comprehensive analysis of synthesis gas (syngas) oxidation kinetics in wide ranges of temperature ... on the basis of the reaction mechanism of syngas ignition and combustion in air. A vast set of experimental ...

A. M. Starik; N. S. Titova; A. S. Sharipov

2010-09-01T23:59:59.000Z

418

Mechanical Compression Heat Pumps  

E-Print Network [OSTI]

MECHANICAL COMPRESSION HEAT PUMPS Thomas-L. Apaloo and K. Kawamura Mycom Corporation, Los Angeles, California J. Matsuda, Mayekawa Mfg. Co., Tokyo, Japan ABSTRACT Mechanical compression heat pumping is not new in industrial applications.... In fact, industry history suggests that the theoretical concept was developed before 1825. Heat pump manufacturers gained the support of consultants and end-users when the energy crisis hit this country in 1973. That interest, today, has been...

Apaloo, T. L.; Kawamura, K.; Matsuda, J.

419

THERMAL PROPERTIES OF SINGLE-WALLED CARBON NANOTUBES Shigeo MARUYAMA  

E-Print Network [OSTI]

, optical and mechanical properties, thermal properties of SWNTs are quite unique with the high thermal and thermal conductance between a nanotube and various materials are reviewed. The experimental approach, and thermal boundary resistance in a junction of nanotubes are reviewed. Then, the heat transfer from an SWNT

Maruyama, Shigeo

420

Properties study of cotton stalk fiber/gypsum composite  

SciTech Connect (OSTI)

This manuscript addresses treating cotton stalk fiber surface with styrene acrylic emulsion, which improves the interfacial combined state of cotton stalk fiber/gypsum composite effectively and improves its mechanical properties notably. Mixes less slag, ordinary Portland cement, etc., to modify gypsum base. The electron microscope was utilized to analyze and research on the effect on composite properties of the abovementioned mixtures.

Li Guozhong; Yu Yanzhen; Zhao Zhongjian; Li Jianquan; Li Changchun

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Feedback Control of Microstate to Control Macrostate Properties  

E-Print Network [OSTI]

Feedback Control of Microstate to Control Macrostate Properties of Controllable Fluids by John R. Lloyd and Clark J. Radcliffe Department of Mechanical Engineering Michigan State University East Lansing, MI 48824-1226 ABSTRACT Controllable fluids are those fluids whose properties can be controlled

Radcliffe, Clark J.

422

Mechanical Engineering Is Mechanical Engineering right for me?  

E-Print Network [OSTI]

Mechanical Engineering Is Mechanical Engineering right for me? If you are interested in the wide range of principles related to mechanical systems then Mechanical Engineering is well suited to you. A Mechanical Engineering degree programme will focus on aspects such as analysis, design, manufacture

Harman, Neal.A.

423

Reflection of Nonlinear Acoustic Waves from the Mechanically Free Surface of an Unconsolidated Granular Medium  

E-Print Network [OSTI]

1 Reflection of Nonlinear Acoustic Waves from the Mechanically Free Surface of an Unconsolidated a mechanically free surface of an unconsolidated granular layer under gravity is solved analytically using of the acoustic experiments directed to the investigation of fundamental mechanical properties of unconsolidated

Paris-Sud XI, Université de

424

Nanoscale strain-induced pair suppression as a vortex-pinning mechanism in high- temperature superconductors  

SciTech Connect (OSTI)

Boosting large-scale superconductor applications require nanostructured conductors with artificial pinning centres immobilizing quantized vortices at high temperature and magnetic fields. Here we demonstrate a highly effective mechanism of artificial pinning centers in solution-derived high-temperature superconductor nanocomposites through generation of nanostrained regions where Cooper pair formation is suppressed. The nanostrained regions identified from transmission electron microscopy devise a very high concentration of partial dislocations associated with intergrowths generated between the randomly oriented nanodots and the epitaxial YBa{sub 2}Cu{sub 3}O{sub 7} matrix. Consequently, an outstanding vortex-pinning enhancement correlated to the nanostrain is demonstrated for four types of randomly oriented nanodot, and a unique evolution towards an isotropic vortex-pinning behaviour, even in the effective anisotropy, is achieved as the nanostrain turns isotropic. We suggest a new vortex-pinning mechanism based on the bond-contraction pairing model, where pair formation is quenched under tensile strain, forming new and effective core-pinning regions.

Llordes, Anna [ICMAB, Barcelona, Spain; Palau, A. [ICMAB, Barcelona, Spain; Gazquez, J. [Oak Ridge National Laboratory (ORNL); Coll, M. [ICMAB, Barcelona, Spain; Vlad, R. [ICMAB, Barcelona, Spain; Pomar, A. [ICMAB, Barcelona, Spain; Arbiol, Jordi [ICMAB, Barcelona, Spain; Guzman, Roger [ICMAB, Barcelona, Spain; Ye, S. [ICMAB, Barcelona, Spain; Rouco, V [ICMAB, Barcelona, Spain; Sandiumenge, Felip [ICMAB, Barcelona, Spain; Ricart, Susagna [ICMAB, Barcelona, Spain; Puig, Teresa [ICMAB, Barcelona, Spain; Varela del Arco, Maria [ORNL; Chataigner, D. [CRISMAT, Caen, France; Vanacken, J. [INPAC-Institute for Nanoscale Physics and Chemistry, Leuven, Belgium; Gutierrez, J. [INPAC-Institute for Nanoscale Physics and Chemistry, Leuven, Belgium; Moschalkov, V. [INPAC-Institute for Nanoscale Physics and Chemistry, Leuven, Belgium; Deutscher, G. [Tel Aviv University; Magen Dominguez, Cesar [ORNL; Obradors, Xavier [ICMAB, Barcelona, Spain

2012-01-01T23:59:59.000Z

425

Devitfrification Properties Of Bismuth Borate Glasses Doped With Trivalent Ions  

SciTech Connect (OSTI)

Bismuth borate glasses and crystalline phases have outstanding luminescent and nonlinear optical properties; therefore there is lot of interest in their preparation and characterization. In this study we report the crystallization properties of bismuth borate glasses doped with trivalent ions. Glasses of the composition: xBi{sub 2}O{sub 3}-(100-x)B{sub 2}O{sub 3} (x = 20, 25, 30, 37.5, 40, 50, 60 and 66 mol %) and 40Bi{sub 2}O{sub 3}-1Tv{sub 2}O{sub 3}-59B{sub 2}O{sub 3}(where Tv = Al, Nd and Eu) were prepared by melt quench technique and devitrified by heat treatment above their glass transition temperatures for several hours. The crystalline phases produced were characterized by FTIR absorption spectroscopy, DTA and X-ray diffraction. Bi{sub 3}B{sub 5}O{sub 12} was found to be the predominant phase in all crystallized samples containing Bi{sub 2}O{sub 3} concentration of {<=}40 mol %, at higher Bi{sub 2}O{sub 3} concentration, we observed the formation of Bi{sub 4}B{sub 2}O{sub 9} phase. Glasses with Bi{sub 2}O{sub 3} concentration of {<=}37.5 mol % produced Bi{sub 2}B{sub 8}O{sub 15} phase on crystallization. The metastable BiBO{sub 3}-I phase was formed by short duration heat treatment (less than 5 hours) of the initial glass sample. Doping with rare earth ions like Eu{sup 3+} and Nd{sup 3+} promotes the formation of BiBO{sub 3}-II phase while Al{sup 3+} doping suppresses it.

Khanna, Atul [Department of Physics, Guru Nanak Dev University, Amritsar-143005, Punjab (India); Bajaj, Anu [Department of Applied Sciences, Adesh Institute of Engineering and Technology, Faridkot-151203, Punjab (India)

2010-12-01T23:59:59.000Z

426

Requirements for Hypermedia Development Methods: A Survey of Outstanding Methods  

Science Journals Connector (OSTI)

The aim of this paper is to present a framework of requirements to survey design methods for hypermedia systems. Such requirements are taken from software engineering as well as from hypermedia engineering fields. Finally, these requirements are applied ...

Susana Montero; Paloma Daz; Ignacio Aedo

2002-05-01T23:59:59.000Z

427

High-Energy Physics Outstanding Junior Investigating Program  

SciTech Connect (OSTI)

Throughout the past ?ve years I have worked to uncover what physics lies beyond that of the standard model. My main focus in the ?rst two and a half years has been to understand physics at the electroweak scale, and to a lesser extent understand the relationship between particle physics and cosmology. My ?nal two and a half years was spent on studying the feasibility of discovering non-standard models of electroweak physics at hadron colliders, working in close contact with experimentalists at the Tevatron and the LHC. My biggest successes during this period has been both in electroweak physics expanding our understanding of the Higgs sector in supersymmetric theories and ultraviolet completions of little Higgs theories and in collider physics discovering a method for identifying high momentum top quarks and realizing the potential for LHCb to discover some versions of supersymmetry. I have also made some progress towards a particle physics/e?ective ?eld theory solution of the cosmological constant problem.

Kaplan, David, E.

2009-10-12T23:59:59.000Z

428

Nevada Field Office recognized for its outstanding aviation program...  

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

Nevada Field Office (NFO) and its contract partner, the National Security Technologies (NSTec) Remote Sensing Laboratory (RSL) Aviation Department, have received the 2012 U.S....

429

Outstanding problems in nuclear astrophysics: recent progress at TRIUMF  

SciTech Connect (OSTI)

Recent experimental and theoretical efforts at TRIUMF on nuclear reactions relevant to big bang nucleosynthesis, quiescent stellar fusion, classical novae, and Type I X-ray bursts are described.

Davids, B., E-mail: davids@triumf.ca [TRIUMF, 4004 Wesbrook Mall, Vancouver, BC (Canada)

2014-04-15T23:59:59.000Z

430

Energy Secretary Honors EM Employee for Outstanding Safety Oversight  

Broader source: Energy.gov [DOE]

Energy Secretary Ernest Moniz, center, recently honored EM employee Robert (Dennis) Yates from the Savannah River Operations Office, right, as DOEs Facility Representative of the Year for 2013.

431

An Outstanding Scientist in Applied AI for Nuclear Research  

Science Journals Connector (OSTI)

After his PhD at Ghent University, Da was attired by the Nuclear Research Center of Belgium in 1991 to optimize a research program for oil reserves using nuclear techniques. His successful accomplishment led to a...

Pierre Dhondt; Eric van Walle

2013-01-01T23:59:59.000Z

432

President Obama Named 13 Energy Department Scientists for Outstanding...  

Office of Environmental Management (EM)

science and technology and their commitment to community service as demonstrated through scientific leadership, public education, or community outreach. For the full list of...

433

Vision: Knowledge for a better world -Internationally Outstanding  

E-Print Network [OSTI]

and Marine Operations and Surveillance - Robotics - Smart Grids - Energy-Efficient Computing Systems Offshore renewable energy Autonomous surveillance Oil & gas in deeper water... .... and in Arctic areas% of The Norwegian Export Income And new Marine Areas: · New Renewable Energy · Ocean Mining · Arctic Technology

Nørvåg, Kjetil

434

Electromagnetic properties of neutrinos  

E-Print Network [OSTI]

A short review on electromagnetic properties of neutrinos is presented. In spite of many efforts in the theoretical and experimental studies of neutrino electromagnetic properties, they still remain one of the main puzzles related to neutrinos.

Carlo Giunti; Alexander Studenikin

2010-06-08T23:59:59.000Z

435

Thermo-Mechanical Processing Parameters for the INCONEL ALLOY 740  

SciTech Connect (OSTI)

In 2000, a Cooperative Research and Development Agreement (CRADA) was undertaken between the Oak Ridge National Laboratory (ORNL) and the Special Metals Corporation (SMC) to determine the mechanical property response of the IN740 alloy to help establish thermo-mechanical processing parameters for the use of this alloy in supercritical and ultra-critical boiler tubes with the potential for other end uses. SMC had developed an alloy, commercially known as INCONEL alloy 740, which exhibited various beneficial physical, mechanical, and chemical properties. As part of SMC's on-going efforts to optimize this alloy for targeted boiler applications there was a need to develop an understanding of the thermo-mechanical response of the material, characterize the resulting microstructure from this processing, and possibly, utilize models to develop the appropriate processing scheme for this product.

Ludtka, G.M.; Smith, G.

2007-11-19T23:59:59.000Z

436

MECHANICAL ENGINEERING UNDERGRADUATE HONORS THESIS  

E-Print Network [OSTI]

, when two bound copies are to be submitted to the Mechanical Engineering Services Office #12;PLEASE Mechanical Engineering Student Services: ¨ Application Approved ¨ Application Denied Signature of UGMECHANICAL ENGINEERING UNDERGRADUATE HONORS THESIS The Department of Mechanical Engineering

Prinz, Friedrich B.

437

STANFORD UNIVERSITY MECHANICAL ENGINEERING DEPARTMENT  

E-Print Network [OSTI]

20062007 Mechanical Engineering Student Services Building 530, Room 125 (650) 7257695 FAX (650) 7234882STANFORD UNIVERSITY MECHANICAL ENGINEERING DEPARTMENT GRADUATE STUDENT HANDBOOK Academic Year Revised 9/06 #12;MECHANICAL ENGINEERING GRADUATE STUDENT HANDBOOK 20062007 TABLE OF CONTENTS (Clickable

Prinz, Friedrich B.

438

Energy landscapes, folding mechanisms and kinetics of RNA tetraloop hairpins  

Science Journals Connector (OSTI)

Energy landscapes, folding mechanisms and kinetics of RNA tetraloop hairpins ... In this work, we use the discrete path sampling (DPS) approach to explore the energy landscapes of two RNA tetraloop hairpins, and provide insights into their folding mechanisms and kinetics in atomistic detail. ... Our results show that the potential energy landscapes have a distinct funnel-like bias towards the folded hairpin state, consistent with efficient structure-seeking properties. ...

Debayan Chakraborty; Rosana Collepardo-Guevara; David J. Wales

2014-12-02T23:59:59.000Z

439

Mechanical Behavior of Indium Nanostructures  

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

Mechanical Behavior of Indium Nanostructures Mechanical Behavior of Indium Nanostructures Print Wednesday, 26 May 2010 00:00 Indium is a key material in lead-free solder...

440

AWARD FOR OUTSTANDING SERVICE TO THE CAMPUS COMMUNITY This Award acknowledges outstanding contributions to the life of the campus  

E-Print Network [OSTI]

Challenge. #12;· In 2003, in recognition of the integration of environmental management into its practices and cooperation of staff and students of the University. Warren Overton, Manager of the Energy and Sustainability in areas such as water conservation, waste and recycling, energy and greenhouse gas emissions, biodiversity

Botea, Adi

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

AWARD FOR OUTSTANDING SERVICE TO THE CAMPUS COMMUNITY This Award acknowledges outstanding contributions to the life of the campus  

E-Print Network [OSTI]

Keith Conley has served the campus community in his roles as Dean of Fenner Hall, Head of Toad and Ursula Halls and more recently as Head of Burton and Garran Hall. Mr Conley's widespread support for and a tireless contributor to campus sports and has competed in interhall hockey, volleyball, swimming, table

Botea, Adi

442

Procurement and Property Management  

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

Doing Business with... Doing Business with... Brookhaven National Laboratory (BNL) Procurement and Property Management provides customers with timely, cost-effective procurement and property management services integrated with and supporting the Laboratory's science, technology and cleanup missions in accordance with the prime contract and customer expectations. Services Include: Procurement of high quality supplies and services that meet customer requirements, Identification and control of government property, Maintaining an efficient stores operation, Expeditious shipping, receiving and delivery services. PPM Has Moved! We are located at: 44 Ramsey Road Shirley, NY 11967 Directions Procurement Property Management Purchasing System Approval (pdf) Personal Property Approval (pdf)

443

Acoustic hemostasis: Underlying mechanisms  

Science Journals Connector (OSTI)

Cessation of hemorrhage using extrinsic interventional methods is possible with delivery of energy to bleeding tissues i.e. cauterization. High intensity focused ultrasound (HIFU) is one such method with significant advantages of delivering high levels of energy to well?defined regions of deep?seated tissues even during profuse bleeding. The physical mechanisms involved in this process include thermal and mechanical effects of HIFU leading to various biological effects. Our results using HIFU devices of 15 MHz and focal derated intensities of 1 00010 000 W/cm2 in solid organs such as liver spleen and kidneys and major and minor blood vessels show that temperature of targeted tissues reaches 70100C within seconds with formation of microbubbles approximately 5??200 ? in size and concentration of 100 bubbles/mm3. It appears that boiling of interstitial fluids and blood and acoustic cavitation are both involved. The biological effects include coagulative necrosis mechanical disruption of tissue structure potentially leading to release of tissue factors enhancing the coagulation coagulum and thrombus formation at a wound site tissue fusion via collagen and elastin remodeling and fibrin plug formation with minimal damage of the surrounding tissues. These mechanisms appear to provide an effective and safe method of hemorrhage control. [Work supported by NIH DoD NSBRI.

Shahram Vaezy; Lawrence Crum; Steve Carter; Grant OKeefe; Vesna Zderic; Roy Martin; Riyad Karmy?Jones

2007-01-01T23:59:59.000Z

444

Thermodynamics and statistical mechanics  

Science Journals Connector (OSTI)

... IN this book, Professor Landsberg brings together thermodynamics and statistical mechanics to provide a coherent account of these interrelated branches of physical theory ... side usually result in the essential structures of both becoming obscured. The value of classical thermodynamics lies in what it can do without invoking microscopic models and it is best learnt ...

C.J. Adkins

1979-12-20T23:59:59.000Z

445

Residential Mechanical Precooling  

SciTech Connect (OSTI)

This research conducted by the Alliance for Residential Building Innovation team evaluated mechanical air conditioner pre-cooling strategies in homes throughout the United States. EnergyPlus modeling evaluated two homes with different performance characteristics in seven climates. Results are applicable to new construction homes and most existing homes built in the last 10 years, as well as fairly efficient retrofitted homes.

German, A.; Hoeschele, M.

2014-12-01T23:59:59.000Z

446

Department of Mechanical Engineering "From Compliant Mechanisms to  

E-Print Network [OSTI]

such as 3D printing with materials specialized in electro- mechanical sensing and actuation in addition

Militzer, Burkhard

447

Program Transformation Mechanics A Classification of Mechanisms for Program Transformation  

E-Print Network [OSTI]

Program Transformation Mechanics A Classification of Mechanisms for Program Transformation with a Survey of Existing Transformation Systems Jonne van Wijngaarden Eelco Visser UU-CS-2003-048 Institute Transformation Mechanics A Classification of Mechanisms for Program Transformation with a Survey of Existing

Utrecht, Universiteit

448

MECHANICAL ENGINEERING 121 Department of Mechanical Engineering (MEE)  

E-Print Network [OSTI]

MECHANICAL ENGINEERING 121 Department of Mechanical Engineering (MEE) *Available for general education credit. The Department of Mechanical Engineering offers an upper- division curriculum which leads to a B.S. in mechanical engineering. The curriculum is based on a strong foundation of fundamental

Kostic, Milivoje M.

449

Mechanical engineering Mechanical engineering is about solving problems, designing processes,  

E-Print Network [OSTI]

Mechanical engineering Mechanical engineering is about solving problems, designing processes, and making products to improve the quality of human life and shape the economy. Mechanical engineers apply the principles of physics, mathematics, computing and practical skills to design mechanical systems and artefacts

Waikato, University of

450

114 MECHANICAL ENGINEERING Department of Mechanical Engineering (MEE)  

E-Print Network [OSTI]

114 MECHANICAL ENGINEERING Department of Mechanical Engineering (MEE) *Available for general education credit. The Department of Mechanical Engineering offers an upper- division curriculum which leads to a B.S. in mechanical engineering. The curriculum is based on a strong foundation of fundamental

Kostic, Milivoje M.

451

NETL: Available NETL Property  

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

Available NETL Property Available NETL Property Solicitations & Business Opportunities Available NETL Property Buying Property from NETL NETL offers surplus equipment for sale to the public and provides opportunities for colleges and universities to acquire laboratory equipment. It also provides gifts of math and science equipment to eligible recipients in the field of education. Personal Property Sales Program The following surplus personal property is available for sale to the public: Property Sales Laboratory Equipment Donation Grant Program (LEDP) (formerly known as EnergyRelated Laboratory Equipment (ERLE) Grant Program) NETL's ERLE Coordinator is Frances M. Wright This program permits universities, colleges, and other non-profit educational institutions to acquire used energy-related laboratory equipment. All non-profit educational institutions of higher learning that are interested in establishing or upgrading energy-oriented educational programs in life, physical, and environmental sciences or in engineering are eligible. The website can be accessed at: http://www.osti.gov/ledp/

452

Increasing pipeline mechanical integrity through the management of mechanical and toughness data  

SciTech Connect (OSTI)

On October 22, 1991, prompted by two brittle fractures that initiated after pipe movement events, the Office of Pipeline Safety (OPS) issued an Alert Notice requiring pipeline owners and operators of gas or hazardous liquid pipeline facilities to conduct analyses before moving pipelines, whether or not the pipelines are pressurized at the time of movement. Since most operators have not typically maintained detailed information on the material characteristics of all steel pipelines in operation (i.e. fracture toughness properties), the OPS recommended that samples of new pipe, stock pipe, and pipe removed from service should be tested and the results accumulated into a database. To this end, Marathon Pipe Line (MPL) Company developed an in-house database system to manage mechanical, toughness, and weldability properties of pipeline materials. Marathon`s approach to the management of pipeline toughness and mechanical data is presented herein. During the design phase of a planned pipe movement, such as a line lowering, engineers consult the database for mechanical and toughness information related to the grade, size, and line section of interest. Based on the mechanical and toughness historical data, a safe line lowering condition is recommended. Over the last two years, more than 1,200 sets of data on more than 200 line sections have been entered into the database.

Biagiotti, S.F. Jr. [Marathon Oil Co., Littleton, CO (United States); Battisti, J.A. [Marathon Pipe Line Co., Findlay, OH (United States)

1996-07-01T23:59:59.000Z

453

Multi-scale electrical and thermal properties of aligned multi-walled carbon nanotubes and their composites  

E-Print Network [OSTI]

Carbon nanotubes (CNTs) are a potential new component to be incorporated into existing aerospace structural composites for multi-functional (mechanical, electrical, thermal, etc.) property enhancement and tailoring. ...

Yamamoto, Namiko

2011-01-01T23:59:59.000Z

454

Mechanical Engineering Department Seminar Series  

E-Print Network [OSTI]

Mechanical Engineering Department Seminar Series Rational Mechanics of Viral Shells: Is Continuum Theory a Stretch? William S. Klug Associate Professor, Mechanical & Aerospace Engineering, University-assembly. The capacity of these shells to respond structurally and mechanically to physical and chemical stimuli also

Eustice, Ryan

455

07SCHOOL OF MECHANICAL ENGINEERING  

E-Print Network [OSTI]

, mechanical with nuclear engineering, and medical engineering. Engineers qualified in all these areas play MECHANICAL ENGINEERING MECHANICAL WITH NUCLEAR ENGINEERING MEDICAL ENGINEERING OTHER COURSES TO CONSIDER Entryrequirementsandhowtoapply Modules MedicalEngineering(MEng,BEng) MechanicalwithNuclearEngineering(MEng,BEng) MechanicalEngineering

Dimitrova, Vania

456

Micro-and Macrorheological Properties of Isotropically Cross-Linked Actin Networks  

E-Print Network [OSTI]

Micro- and Macrorheological Properties of Isotropically Cross-Linked Actin Networks Yuxia Luan. Thus, the micro- and macromechanical properties of isotropically cross-linked in vitro actin networks-linking molecules. The microstructure of the resulting networks mainly determines their mechanical properties

Bausch, Andreas

457

Mechanical Characterization of Rigid Polyurethane Foams.  

SciTech Connect (OSTI)

Foam materials are used to protect sensitive components from impact loading. In order to predict and simulate the foam performance under various loading conditions, a validated foam model is needed and the mechanical properties of foams need to be characterized. Uniaxial compression and tension tests were conducted for different densities of foams under various temperatures and loading rates. Crush stress, tensile strength, and elastic modulus were obtained. A newly developed confined compression experiment provided data for investigating the foam flow direction. A biaxial tension experiment was also developed to explore the damage surface of a rigid polyurethane foam.

Lu, Wei-Yang

2014-12-01T23:59:59.000Z

458

Mechanical Operations and Maintenance  

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

Holiday Work Status Holiday Work Status Mechanical Operations & Maintenance Group APS Storage Ring Magnets The Advanced Photon Source (APS) at the Argonne National Laboratory is a national synchrotron-radiation research facility funded by the U.S. Department of Energy. Using high-brilliance x-ray beams from the APS, an international community of scientists conducts forefront basic and applied research in the fields of material science, biological science, physics, chemistry, environmental, geophysical and planetary science. The 1.1-km circumference APS facility consists of several major subsystems including magnets, vacuum chambers, radio-frequency cavities, diagnostics instrumentation, x-ray absorbers and apertures, and cooling water subsystems. Each of these subsystems contains hundreds of mechanical

459

Mechanics of collective unfolding  

E-Print Network [OSTI]

Mechanically induced unfolding of passive crosslinkers is a fundamental biological phenomenon encountered across the scales from individual macro-molecules to cytoskeletal actin networks. In this paper we study a conceptual model of athermal load-induced unfolding and use a minimalistic setting allowing one to emphasize the role of long-range interactions while maintaining full analytical transparency. Our model can be viewed as a description of a parallel bundle of N bistable units confined between two shared rigid backbones that are loaded through a series spring. We show that the ground states in this model correspond to synchronized, single phase configurations where all individual units are either folded or unfolded. We then study the fine structure of the wiggly energy landscape along the reaction coordinate linking the two coherent states and describing the optimal mechanism of cooperative unfolding. Quite remarkably, our study shows the fundamental difference in the size and structure of the folding-u...

Caruel, M; Truskinovsky, L

2015-01-01T23:59:59.000Z

460

High cycle fatigue properties of aluminium foams  

SciTech Connect (OSTI)

Fatigue lifetime measurements have been performed on foamed Al-Mg-Si wrought alloys and Al-Si cast alloys in the high cycle range using an ultrasonic resonance testing method. The porous structure of the material is described by quantitative image analysis of optical micrographs and non destructively by X-ray computer tomography. The static mechanical properties as determined by tensile, compression and bending tests in earlier studies are used for material characterization in this paper. The evaluation of the stress main curves is specified for porous structures to obtain the stiffness and the plateau strength. The influence of the surface skin on the mechanical properties as well as an oscillation behavior during lifetime measurements was studied.

Zettl, B.E.; Stanzl-Tschegg, S.E. [Univ. of Agricultural Sciences (Austria). Inst. of Meteorology and Physics; Gradinger, R. [LKR-Centre of Competence on Light Metals, Ranshofen (Austria); Degischer, H.P. [Vienna Univ. of Technology (Austria). Inst. of Material Science

1998-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

Time in quantum mechanics  

E-Print Network [OSTI]

OF CONTENTS I. INTRODUCTION II. HISTORICAL DEVELOPMENT A. Classical Mechanics B. Quantum Theory . C. The Problem 3 4 6 III. TIME ATOMS AND DISCRETE TIME A. The Earliest Applications of Atomistic and Discrete Time . . . . . B. The Radiating Electron... . C. Quantum Field Theory 8 10 l2 IV. TIME OPERATOR FORMULATIONS 16 A. Advocates Against a Time Operator . B. The Possibility of a Time Operator C, Advocates in Favor of a Time Operator D. A Restricted Time Delay Operator: Scattering Theory...

Chapin, Kimberly R.

2012-06-07T23:59:59.000Z

462

Mechanical Surface Waves Accompany Action Potential Propagation  

E-Print Network [OSTI]

Many studies have shown that a mechanical displacement of the axonal membrane accompanies the electrical pulse defining the Action Potential (AP). Despite a large and diverse body of experimental evidence, there is no theoretical consensus either for the physical basis of this mechanical wave nor its interdependence with the electrical signal. In this manuscript we present a model for these mechanical displacements as arising from the driving of surface wave modes in which potential energy is stored in elastic properties of the neuronal membrane and cytoskeleton while kinetic energy is carried by the axoplasmic fluid. In our model these surface waves are driven by the traveling wave of electrical depolarization that characterizes the AP, altering the compressive electrostatic forces across the membrane as it passes. This driving leads to co-propagating mechanical displacements, which we term Action Waves (AWs). Our model for these AWs allows us to predict, in terms of elastic constants, axon radius and axoplasmic density and viscosity, the shape of the AW that should accompany any traveling wave of voltage, including the AP predicted by the Hodgkin and Huxley (HH) equations. We show that our model makes predictions that are in agreement with results in experimental systems including the garfish olfactory nerve and the squid giant axon. We expect our model to serve as a framework for understanding the physical origins and possible functional roles of these AWs in neurobiology.

Ahmed El Hady; Benjamin B. Machta

2014-07-28T23:59:59.000Z

463

Relativistic viscoelastic fluid mechanics  

SciTech Connect (OSTI)

A detailed study is carried out for the relativistic theory of viscoelasticity which was recently constructed on the basis of Onsager's linear nonequilibrium thermodynamics. After rederiving the theory using a local argument with the entropy current, we show that this theory universally reduces to the standard relativistic Navier-Stokes fluid mechanics in the long time limit. Since effects of elasticity are taken into account, the dynamics at short time scales is modified from that given by the Navier-Stokes equations, so that acausal problems intrinsic to relativistic Navier-Stokes fluids are significantly remedied. We in particular show that the wave equations for the propagation of disturbance around a hydrostatic equilibrium in Minkowski space-time become symmetric hyperbolic for some range of parameters, so that the model is free of acausality problems. This observation suggests that the relativistic viscoelastic model with such parameters can be regarded as a causal completion of relativistic Navier-Stokes fluid mechanics. By adjusting parameters to various values, this theory can treat a wide variety of materials including elastic materials, Maxwell materials, Kelvin-Voigt materials, and (a nonlinearly generalized version of) simplified Israel-Stewart fluids, and thus we expect the theory to be the most universal description of single-component relativistic continuum materials. We also show that the presence of strains and the corresponding change in temperature are naturally unified through the Tolman law in a generally covariant description of continuum mechanics.

Fukuma, Masafumi; Sakatani, Yuho [Department of Physics, Kyoto University, Kyoto 606-8502 (Japan)

2011-08-15T23:59:59.000Z

464

Personal Property | Department of Energy  

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

Services » Property Management » Personal Property Services » Property Management » Personal Property Personal Property Personal Property Management and Accountability Personal property management requires a lifecycle approach to be effective. There are four major phases in the personal property lifecycle: acquisition, receipt, utilization, and disposal. Each phase has distinct processes and procedures associated with it to maintain proper stewardship of the Department's assets. If the processes and procedures in one phase are not followed, it makes it difficult to establish and maintain accountability in the subsequent phase. Personal property accountability includes responsibilities for presenting personal property for identification and tagging, which includes: *Presenting personal property for identification;

465

Reading Comprehension - Properties and Changes  

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

Properties and Changes Properties and Changes Matter can be described and identified by physical and chemical properties. Physical _________ chemicals properties substances textures have to do with appearance. You can observe many physical properties with your senses and by measuring the length, _________ width density height property , height, mass and density of a substance. _________ Chemical Matter Described Physical properties include color, shape, smell, texture, taste and size. The state of matter (whether it's a solid, _________ water molecule liquid atom , or gas) and the _________ time temperature design cylinder at which the substance boils, melts or freezes are also physical properties. Magnetic properties are physical properties as well. _________ Chemical Physical Substance Gaseous properties, on the other

466

Appropriability mechanisms in internationalisation: possibilities to safeguard innovations  

Science Journals Connector (OSTI)

The internationalisation of innovation has become increasingly common. With this change, the significance of managing and safeguarding innovations and intellectual property in international environment has risen to new levels, yet challenges are notable as well. Firms face the pressure to find, obtain, and use tools and mechanisms that would enable them to protect their innovations and intangibles against undesirable imitation and, consequently, create better appropriation conditions for themselves. This study examines appropriation of innovations in respect to internationalisation. The objective of the article is to find out: a) how individual safeguarding/appropriability mechanisms are perceived by internationalising and internationalised firms; b) how these mechanisms relate to succeeding in international markets. The findings from the examination of 299 Finnish firms indicate that not all mechanisms are equally relevant considering the tendency of the firm to internationalise, and that different mechanisms yield different results in terms of international performance.

Pia Hurmelinna-Laukkanen; Kaisu Puumalainen; Sami Saarenketo

2012-01-01T23:59:59.000Z

467

"Evaluating the effects of the loading environment on the mechanical  

E-Print Network [OSTI]

"Evaluating the effects of the loading environment on the mechanical properties of materials embrittling H2 for the hydrogen energy economy, and material embrittlement and fatigue issues in the resurgent nuclear power field, and alloy selection and life prediction for bio-medical engineering. Proper modeling

Acton, Scott

468

Fundamentals of Engineering (FE) Exam Fluid Mechanics Review  

E-Print Network [OSTI]

one unit area layer of a substance over another � Viscosity (�): measure of a fluid's resistance Energy, Friction Loss, and Pipe Flow Momentum and Drag #12;Pressure � Gage pressure: measured relative Engineering March 22, 2013 #12;Morning (Fluid Mechanics) A. Flow measurement B. Fluid properties C. Fluid

Provancher, William

469

Mechanics of Insulator Behavior in Concrete Crosstie Fastening Systems  

E-Print Network [OSTI]

gauge · Protect shoulder and attenuate load entering shoulder · Provide electrical isolation betweenMechanics of Insulator Behavior in Concrete Crosstie Fastening Systems Joint Rail Conference and causes · Relevant material properties related to failure modes · Preliminary testing and results · Future

Barkan, Christopher P.L.

470

Adenosine Triphosphate Hydrolysis Mechanism in Kinesin Studied by Combined Quantum-Mechanical/Molecular-Mechanical Metadynamics Simulations  

Science Journals Connector (OSTI)

Adenosine Triphosphate Hydrolysis Mechanism in Kinesin Studied by Combined Quantum-Mechanical/Molecular-Mechanical Metadynamics Simulations ... Future extensive molecular mechanical MD simulations exploring the stability of the various states would be very beneficial, although they are outside the scope of the present work. ... Here, we discuss the functions and mechanisms of action of three such crosslinkers: the motors kinesin-5 and kinesin-14, and the non-motor MAPs of the Ase1p family. ...

Matthew J. McGrath; I.-F. Will Kuo; Shigehiko Hayashi; Shoji Takada

2013-05-23T23:59:59.000Z

471

Mechanical Behavior of Diamond-Sawn Multi-Crystalline Silicon Wafers and its Improvement  

Science Journals Connector (OSTI)

Poor mechanical property is identified as a potential barrier to commercial development of diamond wire sawn multi-crystalline silicon wafers. 3-point bending tests of the diamond-sawn multi-crystalline silico...

Hongchen Meng; Lang Zhou

2014-04-01T23:59:59.000Z

472

Mechanical behavior of closed-cell and hollow-sphere metallic foams  

E-Print Network [OSTI]

(cont.) The elastic anisotropy and yield surfaces are fully characterized, and numerical equations are developed to allow the simple evaluation of the effect of geometric and material properties on the mechanical behavior ...

Sanders, Wynn Steven, 1974-

2002-01-01T23:59:59.000Z

473

Fortification of baked and fried tortilla chips with mechanically expelled soy flour  

E-Print Network [OSTI]

content were evaluated. Texture was measured by objective and subjective tests. Sensory properties were evaluated using a nine point hedonic scale. Soybeans (food grade Hartz) were mechanically expelled to obtain partially defatted soy flour of 6.7% final...

De La Torre Pineda, Monica

2009-05-15T23:59:59.000Z

474

Mechanical Systems Qualification Standard  

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

61-2008 61-2008 June 2008 DOE STANDARD MECHANICAL SYSTEMS QUALIFICATION STANDARD DOE Defense Nuclear Facilities Technical Personnel U.S. Department of Energy AREA TRNG Washington, D.C. 20585 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. DOE-STD-1161-2008 ii This document is available on the Department of Energy Technical Standards Program Web Site at http://www.hss.energy.gov/nuclearsafety/techstds/ DOE-STD-1161-2008 iv INTENTIONALLY BLANK DOE-STD-1161-2008 v TABLE OF CONTENTS ACKNOWLEDGMENT................................................................................................................ vii PURPOSE ....................................................................................................................................1

475

Fields and Quantum Mechanics  

E-Print Network [OSTI]

The quantum field theories (QFT) constructed in [1,2] include phenomenology of interest. The constructions approximate: scattering by $1/r$ and Yukawa potentials in non-relativistic approximations; and the first contributing order of the Feynman series for Compton scattering. To have a semi-norm, photon states are constrained to transverse polarizations and for Compton scattering, the constructed cross section deviates at large momentum exchanges from the cross section prediction of the Feynman rules. Discussion includes the incompatibility of canonical quantization with the constructed interacting fields, and the role of interpretations of quantum mechanics in realizing QFT.

Glenn Eric Johnson

2014-12-21T23:59:59.000Z

476

Property Management | Department of Energy  

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

Management Management Property Management Personal Property Management and Accountability for Headquarters Management Personal property management includes all functions necessary for the proper determination of need, source, acquisition, receipt, accountability, utilization, maintenance, rehabilitation, storage, distribution and disposal of property. Authorized Property Representatives Effective October 2, 2013: Authorized Property Pass Signers List and Accountable Property Representatives List Personal Property Guidance Personal property management requires a lifecycle approach to be effective. There are four major phases in the personal property lifecycle: acquisition, receipt, utilization, and disposal. Each phase has distinct processes and procedures associated with it to maintain proper stewardship

477

Magnetic reconnection as a possible heating mechanism of the local high temperature protons within magnetic clouds  

Science Journals Connector (OSTI)

Magnetic clouds have the outstanding observational features of low proton temperature and plasma beta value, but numerous observations show that some magnetic clouds often have local high temperature phenomena...

HengQiang Feng; JieMin Wang

2014-08-01T23:59:59.000Z

478

Review of particle properties  

Science Journals Connector (OSTI)

This review of the properties of leptons, mesons, and baryons is an updating of the Review of Particle Properties, Particle Data Group [Phys. Lett. 111B (1982)]. Data are evaluated, listed, averaged, and summarized in tables. Numerous tables, figures, and formulae of interest to particle physicists are also included. A data booklet is available.

C. G. Wohl; R. N. Cahn; A. Rittenberg; T. G. Trippe; G. P. Yost; F. C. Porter; J. J. Hernandez; L. Montanet; R. E. Hendrick; R. L. Crawford; M. Roos; N. A. Trnqvist; G. Hhler; M. Aguilar-Benitez; T. Shimada; M. J. Losty; G. P. Gopal; Ch. Walck; R. E. Shrock; R. Frosch; L. D. Roper; W. P. Trower; B. Armstrong (Particle Data Group)

1984-04-01T23:59:59.000Z

479

Renewable Energy Systems Property Tax Exemption | Department of Energy  

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

Property Tax Exemption Property Tax Exemption Renewable Energy Systems Property Tax Exemption < Back Eligibility Commercial Industrial Residential Savings Category Bioenergy Heating & Cooling Commercial Heating & Cooling Solar Heating Buying & Making Electricity Swimming Pool Heaters Water Heating Wind Maximum Rebate None Program Info State Texas Program Type Property Tax Incentive Rebate Amount 100% Provider Comptroller of Public Accounts The Texas property tax code allows an exemption of the amount of the appraised property value that arises from the installation or construction of a solar or wind-powered energy device that is primarily for the production and distribution of thermal, mechanical, or electrical energy for on-site use, or devices used to store that energy. "Solar" is broadly

480

Transport properties of disordered porous media from the microstructure  

SciTech Connect (OSTI)

Progress has been made in five general areas: (1) the development of cross-property relations, i.e., relationships between one effective property and a different effective property; (2) the development of a systematic means to represent and calculate statistical correlation functions that arise in rigorous property relations for heterogeneous media, using statistical-mechanical methods; (3) the derivation and calculation of property relations which depend upon this microstructural information; (4) sterically hindered fragmentation in reactive solids using percolation theory and simulations; and (5) the use of Brownian-motion simulation techniques to exactly'' predict the effective properties of disordered media. We embarked on a new area of research, namely, the study of passive advection of tracer particles in random velocity fields.

Torquato, S.

1991-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "outstanding mechanical properties" 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

HEAVY AND THERMAL OIL RECOVERY PRODUCTION MECHANISMS  

SciTech Connect (OSTI)

This technical progress report describes work performed from April 1 through June 30, 2002, for the project ''Heavy and Thermal Oil Recovery Production Mechanisms.'' We investigate a broad spectrum of topics related to thermal and heavy-oil recovery. Significant results were obtained in the areas of multiphase flow and rock properties, hot-fluid injection, improved primary heavy oil recovery, and reservoir definition. The research tools and techniques used are varied and span from pore-level imaging of multiphase fluid flow to definition of reservoir-scale features through streamline-based history-matching techniques. Briefly, experiments were conducted to image at the pore level matrix-to-fracture production of oil from a fractured porous medium. This project is ongoing. A simulation studied was completed in the area of recovery processes during steam injection into fractured porous media. We continued to study experimentally heavy-oil production mechanisms from relatively low permeability rocks under conditions of high pressure and high temperature. High temperature significantly increased oil recovery rate and decreased residual oil saturation. Also in the area of imaging production processes in laboratory-scale cores, we use CT to study the process of gas-phase formation during solution gas drive in viscous oils. Results from recent experiments are reported here. Finally, a project was completed that uses the producing water-oil ratio to define reservoir heterogeneity and integrate production history into a reservoir model using streamline properties.

Anthony R. Kovscek

2002-07-01T23:59:59.000Z

482

Rock mechanics contributions from defense programs  

SciTech Connect (OSTI)

An attempt is made at illustrating the many contributions to rock mechanics from US defense programs, over the past 30-plus years. Large advances have been achieved in the technology-base area covering instrumentation, material properties, physical modeling, constitutive relations and numerical simulations. In the applications field, much progress has been made in understanding and being able to predict rock mass behavior related to underground explosions, cratering, projectile penetration, and defense nuclear waste storage. All these activities stand on their own merit as benefits to national security. But their impact is even broader, because they have found widespread applications in the non-defense sector; to name a few: the prediction of the response of underground structures to major earthquakes, the physics of the earth`s interior at great depths, instrumentation for monitoring mine blasting, thermo-mechanical instrumentation useful for civilian nuclear waste repositories, dynamic properties of earthquake faults, and transient large-strain numerical modeling of geological processes, such as diapirism. There is not pretense that this summary is exhaustive. It is meant to highlight success stories representative of DOE and DOD geotechnical activities, and to point to remaining challenges.

Heuze, F.E.

1992-02-01T23:59:59.000Z

483

A study of the effects of nanoparticle modification on the thermal, mechanical and hygrothermal performance of carbon/vinyl ester composites.  

E-Print Network [OSTI]

?? Enhancement of mechanical, thermal and hygrothermal properties of carbon fiber/vinyl ester (CFVE) composites through nanoparticle reinforcement has been investigated. CFVE composites are becoming more (more)

Powell, Felicia M.

2012-01-01T23:59:59.000Z

484

A study of the effects of nanoparticle modification on the thermal, mechanical and hygrothermal performance of carbon/vinyl ester compounds.  

E-Print Network [OSTI]

??Enhancement of mechanical, thermal and hygrothermal properties of carbon fiber/vinyl ester (CFVE) composites through nanoparticle reinforcement has been investigated. CFVE composites are becoming more and (more)

Powell, Felicia M.

2012-01-01T23:59:59.000Z

485

PROPERTIES OF FIBERBOARD OVERPACK MATERIAL IN THE 9975 SHIPPING PACKAGE FOLLOWING THERMAL AGING  

SciTech Connect (OSTI)

Many radioactive material shipping packages incorporate cane fiberboard overpacks for thermal insulation and impact resistance. Mechanical, thermal and physical properties have been measured on cane fiberboard following thermal aging in several temperature/humidity environments. Several of the measured properties change significantly over time in the more severe environments, while other properties are relatively constant. These properties continue to be tracked, with the goal of developing a model for predicting a service life under long-term storage conditions.

Daugherty, W

2007-01-10T23:59:59.000Z

486

College of Engineering Mechanical Engineering  

E-Print Network [OSTI]

College of Engineering Mechanical Engineering Core 2.0 Completion Checklist Mechanical Engineering Science IN CHMY 141 (CHEM 131) 6 Research and Creative Experience R EMEC 489R & EMEC 499 R (ME 404R & ME

Dyer, Bill

487

Mechanical engineering COLLEGE of ENGINEERING  

E-Print Network [OSTI]

. Mechanical engineering is a broad, versatile and creative discipline concerned with conversion of energyMechanical engineering COLLEGE of ENGINEERING DepartmentofMechanicalEngineering CollegeofEngineering 5050AnthonyWayneDrive Detroit,MI48202 College of engineering t Educating future engineers for 80 years

Berdichevsky, Victor

488

Exploiting mechanical biomarkers in microfluidics  

E-Print Network [OSTI]

Exploiting mechanical biomarkers in microfluidics Xiaole Maoa and Tony Jun Huang*b DOI: 10.1039/c2 mechanical biomarkers in microfluidic devices. This trend makes sense because microfluidic devices often of mechanical biomarker- based microfluidic applications. We believe that these examples are just the tip

489

MASTER OF SCIENCE MECHANICAL ENGINEERING  

E-Print Network [OSTI]

MASTER OF SCIENCE IN MECHANICAL ENGINEERING 75 DEVELOPMENT OF A MODEL TO PREDICT AND ASSESS SURFACE Master of Science in Mechanical Engineering-December 2000 Advisors: Charles N. Calvano, Department of Mechanical Engineering David W. Byers, Naval Surface Warfare Center-Carderock Division Survivability has

490

Mechanics of Peridynamic Membranes  

National Nuclear Security Administration (NNSA)

JBAidun AdvMatSci090831 JBAidun AdvMatSci090831 1 Accurate Prediction of Dynamic Fracture with Peridynamics John B. Aidun & Stewart A. Silling Multiscale Dynamic Material Modeling Sandia National Laboratories Prague, Czech Republic August 30 - September 3, 2009 Joint U.S.-Russian Conference on Advances in Materials Science SAND2009-5095C Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. JBAidun AdvMatSci090831 2 Fracture Mechanics Theory and Dynamic Fracture * Onset of crack growth can be accurately predicted * Crack growth speed and direction cannot! Wanted: A successful method for simulating Dynamic Fracture * Such a method must be able to reproduce the

491

Vehicle rear suspension mechanism  

SciTech Connect (OSTI)

A vehicle rear suspension mechanism is described which consists of: a suspension member connected with a vehicle body; wheel hub means supporting a rear wheel having a wheel center plane for rotation about a rotating axis; and connecting means for connecting the wheel hub means with the suspension member. The connecting means include ball joint means having a pivot center located forwardly of and below the rotating axis of the rear wheel and connecting the wheel hub means to the suspension member pivotably about the pivot center, first resilient means located between the wheel hub means and the suspension member rearwardly of and above the rotating axis of the rear wheel, and second resilient means located between the wheel hub means and the suspension member forwardly of and above the rotating axis of the rear wheel.

Kijima, T.; Maebayashi, J.

1986-08-05T23:59:59.000Z

492

Mechanically expandable annular seal  

DOE Patents [OSTI]

A mechanically expandable annular reusable seal assembly to form an annular hermetic barrier between two stationary, parallel, and planar containment surfaces is described. A rotatable ring, attached to the first surface, has ring wedges resembling the saw-tooth array of a hole saw. Matching seal wedges are slidably attached to the ring wedges and have their motion restricted to be perpendicular to the second surface. Each seal wedge has a face parallel to the second surface. An annular elastomer seal has a central annular region attached to the seal wedges' parallel faces and has its inner and outer circumferences attached to the first surface. A rotation of the ring extends the elastomer seal's central region perpendicularly towards the second surface to create the fluid tight barrier. A counter rotation removes the barrier. 6 figs.

Gilmore, R.F.

1983-07-19T23:59:59.000Z

493

PEBBLES Mechanics Simulation Speedup  

SciTech Connect (OSTI)

Pebble bed reactors contain large numbers of spherical fuel elements arranged randomly. Determining the motion and location of these fuel elements is required for calculating certain parameters of pebble bed reactor operation. These simulations involve hundreds of thousands of pebbles and involve determining the entire core motion as pebbles are recirculated. Single processor algorithms for this are insufficient since they would take decades to centuries of wall-clock time. This paper describes the process of parallelizing and speeding up the PEBBLES pebble mechanics simulation code. Both shared memory programming with the Open Multi-Processing API and distributed memory programming with the Message Passing Interface API are used in simultaneously in this process. A new shared memory lock-less linear time collision detection algorithm is described. This method allows faster detection of pebbles in contact than generic methods. These combine to make full recirculations on AVR sized reactors possible in months of wall clock time.

Joshua J. Cogliati; Abderrafi M. Ougouag

2010-05-01T23:59:59.000Z

494

PROPERTIES OF DEFECTS AND IMPLANTS IN Mg+ IMPLANTED SILICON CARBIDE  

SciTech Connect (OSTI)

As a candidate material for fusion reactor designs, silicon carbide (SiC) under high-energy neutron irradiation undergoes atomic displacement damage and transmutation reactions that create magnesium as one of the major metallic products. The presence of Mg and lattice disorder in SiC is expected to affect structural stability and degrade thermo-mechanical properties that could limit SiC lifetime for service. We have initiated a combined experimental and computational study that uses Mg+ ion implantation and multiscale modeling to investigate the structural and chemical effects in Mg implanted SiC and explore possible property degradation mechanisms.

Jiang, Weilin; Zhu, Zihua; Varga, Tamas; Bowden, Mark E.; Manandhar, Sandeep; Roosendaal, Timothy J.; Hu, Shenyang Y.; Henager, Charles H.; Kurtz, Richard J.; Wang, Yongqiang

2013-09-25T23:59:59.000Z

495

HEAVY AND THERMAL OIL RECOVERY PRODUCTION MECHANISMS  

SciTech Connect (OSTI)

This technical progress report describes work performed from July 1 through September, 2003 for the project ''Heavy and Thermal Oil Recovery Production Mechanisms,'' DE-FC26-00BC15311. In this project, a broad spectrum of research is undertaken related to thermal and heavy-oil recovery. The research tools and techniques span from pore-level imaging of multiphase fluid flow to definition of reservoir-scale features through streamline-based history-matching techniques. During this period, work focused on completing project tasks in the area of multiphase flow and rock properties. The area of interest is the production mechanisms of oil from porous media at high temperature. Temperature has a beneficial effect on oil recovery and reduces residual oil saturation. Work continued to delineate how the wettability of reservoir rock shifts from mixed and intermediate wet conditions to more water-wet conditions as temperature increases. One mechanism for the shift toward water-wet conditions is the release of fines coated with oil-wet material from pore walls. New experiments and theory illustrate the role of temperature on fines release.

Anthony R. Kovscek; Louis M. Castanier

2004-03-01T23:59:59.000Z

496

Zinc and mechanical prowess in the jaws of Nereis, a marine worm  

E-Print Network [OSTI]

Zinc and mechanical prowess in the jaws of Nereis, a marine worm Helga C. Lichtenegger* , Thomas of the marine polychaete worm Nereis sp. High copper levels in the polychaete worm Glycera dibranchiata recently and mechanical properties such as fracture toughness, wear resistance, and hardness (1). Invertebrate jaws

Lichtenegger, Helga C.

497

CARBON NANOTUBES: PROPERTIES AND APPLICATIONS  

SciTech Connect (OSTI)

Carbon nanotubes were discovered in 1991 as a minority byproduct of fullerene synthesis. Remarkable progress has been made in the ensuing years, including the discovery of two basic types of nanotubes (single-wall and multi-wall), great strides in synthesis and purification, elucidation of many fundamental physical properties, and important steps towards practical applications. Both the underlying science and technological potential of SWNT can profitably be studied at the scale of individual tubes and on macroscopic assemblies such as fibers. Experiments on single tubes directly reveal many of the predicted quantum confinement and mechanical properties. Semiconductor nanowires have many features in common with nanotubes, and many of the same fundamental and practical issues are in play quantum confinement and its effect on properties; possible device structures and circuit architectures; thermal management; optimal synthesis, defect morphology and control, etc. In 2000 we began a small effort in this direction, conducted entirely by undergraduates with minimal consumables support from this grant. With DOE-BES approval, this grew into a project in parallel with the carbon nanotube work, in which we studied of inorganic semiconductor nanowire growth, characterization and novel strategies for electronic and electromechanical device fabrication. From the beginnings of research on carbon nanotubes, one of the major applications envisioned was hydrogen storage for fuel-cell powered cars and trucks. Subsequent theoretical models gave mixed results, the most pessimistic indicating that the fundamental H2-SWNT interaction was similar to flat graphite (physisorption) with only modest binding energies implying cryogenic operation at best. New material families with encouraging measured properties have emerged, and materials modeling has gained enormously in predictive power, sophistication, and the ability to treat a realistically representative number of atoms. One of the new materials, highly porous carbide-derived carbons (CDC), is the subject of an add-on to this grant awarded to myself and Taner Yildirim (NIST). Results from the add-on led eventually to a new 3-year award DE-FG02-08ER46522 From Fundamental Understanding to Predicting New Nanomaterials for High Capacity Hydrogen Storage, $1000K, (05/31/2008 - 05/01/2011) with Taner Yildirim and myself as co-PIs.

Fischer, John, E.

2009-07-24T23:59:59.000Z

498

Transport Properties of Nanocomposites  

E-Print Network [OSTI]

, and vital information regarding the electrical properties of the fibers and fiberfiber junctions was obtained for the case of two stabilizers used during composite preparation ? Gum Arabic (GA) and Poly(3,4-ethylenedioxythiophene) poly...

Narayanunni, Vinay

2010-07-14T23:59:59.000Z

499

Headquarters Personal Property Management  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

To establish procedures for managing Government personal property owned or leased by the Department of Energy and in the custody of DOE Headquarters employees, including those in the National Nuclear Security Administration. Cancels DOE HQ O 580.1A

2004-10-25T23:59:59.000Z

500

Calculating polynomial runtime properties  

Science Journals Connector (OSTI)

Affine size-change analysis has been used for termination analysis of eager functional programming languages. The same style of analysis is also capable of compactly recording and calculating other properties of programs, including their runtime, maximum ...

Hugh Anderson; Siau-Cheng Khoo; Stefan Andrei; Beatrice Luca

2005-11-01T23:59:59.000Z