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Note: This page contains sample records for the topic "metal fatigue nanoscience" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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1

NANOSCIENCE NANOSCIENCE  

E-Print Network (OSTI)

MSc/PgDip NANOSCIENCE #12;MSc/PgDip NANOSCIENCE This taught MSc course offers a comprehensive overview of state-of-the- art research in Nanoscience and provides graduates with the opportunity towards a PhD. Who might be interested? As both academic and industrial research in areas of nanoscience

Mottram, Nigel

2

Nanoscience and chemistry Nanoscience, Nanotechnology, and Chemistry**  

E-Print Network (OSTI)

Nanoscience and chemistry Nanoscience, Nanotechnology, and Chemistry** George M. Whitesides* Keywords: · chemistry · devices · nanoscience · nanotechnology What is Nanoscience? "Nanoscience and electrical en- gineering, nanoscience is most often associated with quan- tum behavior, and the behavior

Prentiss, Mara

3

nanoscience nanoelectronics  

E-Print Network (OSTI)

tags: toRSS nanoscience energy nanoelectronics nanomechanics Nanowires Exhibit Giant.info/#[[Nanowires%20Exhibit%... 1/2 #12;Related news list by date, most recent first: nanoscience energy

Espinosa, Horacio D.

4

COLLEGE OF SCIENCE Nanoscience  

E-Print Network (OSTI)

COLLEGE OF SCIENCE Nanoscience COLLEGE OF SCIENCE Nanoscience The Bachelor of Science in Nanoscience, new for 2015, is the degree for those who wish to study, work, explore, and create - consumer electronics, personal care products, clothing, and even solar panels. Nanoscience lies

Crawford, T. Daniel

5

carleton.ca Nanoscience  

E-Print Network (OSTI)

carleton.ca Nanoscience #12;Nanoscience is the study of matter and the development of materials. The applications for this field of study are limitless. Nanoscience has the potential to revolutionalize a broad range of industries, from construction and aeronautics to vehicle design and biomedicine. Nanoscience

Dawson, Jeff W.

6

Computational Nanoscience with NWChem. | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

Nanoscience with NWChem. Computational Nanoscience with NWChem. Abstract: The NWChem software as been used to examine many nanoscale systems and their properties over the years. In...

7

Appears in Proceedings of Foundations of Nanoscience, ScienceTechnica, 2004 Circuit and System Architecture for DNA-Guided  

E-Print Network (OSTI)

Appears in Proceedings of Foundations of Nanoscience, ©ScienceTechnica, 2004 Circuit and System in Proceedings of Foundations of Nanoscience, ©ScienceTechnica, 2004 vide a scaffold for metal that forms

Lebeck, Alvin R.

8

Isotopetronics - new direction of nanoscience  

E-Print Network (OSTI)

Isotopetronics is a new branch of the nanoscience. This paper is briefly reviwed the main parts of isotopetronics.

Plekhanov, Vladimir G

2010-01-01T23:59:59.000Z

9

Isotopetronics - new direction of nanoscience  

E-Print Network (OSTI)

Isotopetronics is a new branch of the nanoscience. This paper is briefly reviwed the main parts of isotopetronics.

Vladimir G. Plekhanov

2010-07-30T23:59:59.000Z

10

Carbon Nanoscience and Electronic Structure  

E-Print Network (OSTI)

Carbon Nanoscience and Electronic Structure Louis Brus We explore the fundamental nature electromagnetic fields, and solar energy nanoscience. He has received the APS Langmuir Prize, the ACS Chemistry of Materials Prize, the OSA Wood Prize, the inaugural Kavli Prize in Nanoscience and in 2012 the Bower Prize

Lewis, Jennifer

11

In a nanoscience lab  

E-Print Network (OSTI)

The production, observation and manipulation of very small objects is a tour de force, but these objects, which could infiltrate anywhere without being seen, may arouse suspicion. To assess the situation at best, we describe the activity of a nanoscience research institution, some of the methods used there, the spirit of its researchers and their attitude towards risk.

Bayle-Guillemaud, Pascale; Reiss, Peter; Villain, Jacques

2011-01-01T23:59:59.000Z

12

Nanoscience and Technology | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

NST Division Addressing grand challenges in nanoscience and nanotechnology More The Nanoscience and Technology (NST) Division at Argonne National Laboratory hosts a user facility,...

13

Brookhaven Nanoscience and Nanomaterials  

NLE Websites -- All DOE Office Websites (Extended Search)

Nanoscience and Nanomaterials Nanoscience and Nanomaterials The study of nanomaterials-materials on the scale of a nanometer, or a billionth of a meter-is a burgeoning area of study in physics, as well as materials science, chemistry, and biology. This research is an important because many physical and chemical properties of a material change dramatically at the nanoscale. At Brookhaven, physicists collaborate with materials scientists, biologists, and chemists on various nanomaterial research projects. One object under study is the carbon nanotube, a cylindrical carbon structure that is typically a few nanometers wide and can be up to millions of nanometers long. Carbon nanotubes possess exceptional electric and structural properties for their size, making them attractive for many applications. Now, Brookhaven scientists have found one more interesting property: A single nanotube can emit infrared light when a voltage is applied across it, which makes it the world's first electrically controllable light emitter. This research is ongoing, and the scientists hope to find a way to make the nanotube emit visible light.

14

Nanoscience and nanotechnology as seen  

E-Print Network (OSTI)

2/13/2012 1 Nanoscience and nanotechnology as seen through quantum dots Pat Kambhampati DepartmentScience NanoTechnology · Computers · Lasers · Solar energy· Solar energy · Medicine · Materials The path from

Shoubridge, Eric

15

The Department of Quantum Nanoscience within the Kavli Institute of Nanoscience at Delft University of Technology opens positions of  

E-Print Network (OSTI)

The Department of Quantum Nanoscience within the Kavli Institute of Nanoscience at Delft University of Technology opens positions of PROFESSORS of experimental Quantum Nanoscience (assistant, associate or full) Job description The department of Quantum Nanoscience invites applications for two professors

16

Recommended Plan of Study B.S. in Nanoscience  

E-Print Network (OSTI)

Recommended Plan of Study B.S. in Nanoscience Major in Nanoscience Year Fall Semester Spring Semester Freshman Introduction to Nanoscience I (3) Introduction to Nanoscience II (3) Foundations II (3) Linear Algebra (2) Sophomore Nanoscience Research Seminar (1) Nanoscience Research Rotations

Crawford, T. Daniel

17

Book of Abstracts The Center for Nanoscience &  

E-Print Network (OSTI)

Book of Abstracts 5th Workshop The Center for Nanoscience & Nanotechnology Tel Aviv University: 5TH Workshop The Center for Nanoscience & Nanotechnology Tel Aviv University February 22-24, 2009 Ha: ... " S.E.C. SCIENTIFIC EQUIPMENT CO. LTD. 5TH Workshop The Center for Nanoscience & Nanotechnology Tel

Lifshitz, Ron

18

Argonne CNM Highlight: Nanoscience Student Cooperative  

NLE Websites -- All DOE Office Websites (Extended Search)

Nanoscience Cooperative for Students Nanoscience Cooperative for Students Nanoscience Collective Students The NanoBusiness Alliance's "Nanoscience High School Talent Fellowship" sponsored 25 students from Illinois, North Carolina and Colorado at Argonne's Center for Nanoscale Materials for one week in June 2010. The NanoBusiness Alliance has partnered with Argonne's Center for Nanoscale Materials (CNM) and Division of Educational Programs (DEP) to better prepare high school juniors and seniors pursuing science and engineering careers. Named the Nanoscience High School Talent Fellowship, the program hosted 25 students from Illinois, North Carolina, and Colorado, who participated in a "boot camp" of hands-on laboratory experiments, demonstrations, and lectures by CNM scientists.

19

Fatigue behavior of silicon carbide reinforced titanium (Ti/SCS-6) metal matrix composites  

SciTech Connect

Flexure fatigue behavior was investigated on titanium (Ti-15V-3Cr) metal matrix composites reinforced with cross-poly, continuous silicon carbide (SiC) fibers. The Ti/SCS-6 composites had an 8-ply, (0{degree}, 90{degree}, +45{degree}, {minus}45{degree}), symmetric lay-up. During fatigue testing, four stages of flexure deflection behavior were observed. The deflection at stage 1 increased slightly with fatigue cycling, while that at stage 2 increased significantly with cycling. Interestingly, the deflection at stage 3 again increased negligibly with fatigue cycling. Stage 4 was associated with final failure, and the deflection increased abruptly. In the stage 1 region of the deflection behavior, no cracks were observed, the Ti/SiC interface debonding could be present, and the deflection changed slightly with cycling. When the stage 2 region commenced, cracks began to initiate. As stage 2 progressed, both crack density and crack length increased. The increased crack density and crack length contributed to the great increase in the deflection during stage 2. In stage 3, significant crack deflection and branching, and fiber bridging occurred, and crack density remained relatively constant. Crack deflection and branching, and fiber bridging slowed down crack driving force, and little crack extension was observed, which resulted in an insignificant amount of increase in the stage 3 deflection. The breakage of fibers in stage 4 significantly increased deflection.

Liaw, P.K. [Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering] [Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Diaz, E.S. [Westinghouse Science and Technology Center, Pittsburgh, PA (United States)] [Westinghouse Science and Technology Center, Pittsburgh, PA (United States); Chiang, K.T.; Loh, D.H. [Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.] [Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.

1995-05-15T23:59:59.000Z

20

Nano-science Safety Requirements  

NLE Websites -- All DOE Office Websites (Extended Search)

Nano-science Safety Requirements Effective Date 12/6/2011 Nano-science Safety Requirements Effective Date 12/6/2011 The only official copy of this file is the one on-line. Before using a printed copy, verify that it is the most current version by checking the effective date. Page 1 of 3 Prepared By: L. Stiegler Low Risk - Embedded or Fixed Nanostructures (nanomaterials, incapable as a practical matter, of becoming airborne) Ensure that fixed nanomaterials are not subjected to actions that may generate Unbound NanoParticles (UNP). * For work outside of a HEPA filtered exhaust hood: o No Mechanical stresses e.g., (grinding, scraping, or pressing). o No thermal stresses o Cover samples when practical e.g., (slide cover, Kapton tape, Mylar tape, or cellophane tape). Samples/container must be labeled if not used immediately.

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

Calendar Please use the following icalxml buttons to access the Center for Energy Nanoscience calendar from other applications. You can downloadopen the links to use in any...

22

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

The Center for Energy Nanoscience performs research to create low cost, high efficiency solar cells and light emitting diodes (LEDs) by using semiconductor nanotechnology and...

23

NEBRASKA CENTER FOR MATERIALS AND NANOSCIENCE 2012 SEMINAR SERIES PRESENTS  

E-Print Network (OSTI)

NEBRASKA CENTER FOR MATERIALS AND NANOSCIENCE 2012 SEMINAR SERIES PRESENTS Prof. Swadeshmukul Santra Nanoscience Technology Center Department of Chemistry and Burnett School of Biomedical Sciences

Farritor, Shane

24

The Hebrew University Center for Nanoscience and Nanotechnology  

E-Print Network (OSTI)

The Hebrew University Center for Nanoscience and Nanotechnology Annual Conference 2014 Royal your work during the Nanoscience and Nanotechnology Center Yearly Conference, which will be held

Einat, Aharonov

25

The Hebrew University Center for Nanoscience and Nanotechnology  

E-Print Network (OSTI)

The Hebrew University Center for Nanoscience and Nanotechnology Annual Conference 2015 Holiday Inn your work during the Nanoscience and Nanotechnology Center Yearly Conference, which will be held

Simon, Emmanuel

26

College of Science Bachelor of Science in NANOSCIENCE  

E-Print Network (OSTI)

College of Science Bachelor of Science in NANOSCIENCE For students graduating in calendar year 2016 hours) _______________________________ 3__ II. Nanoscience (40 credit hours) NANO 1015 Introduction to Nanoscience 3__ NANO 3016 Nano. Synth., Fab. and Charact.* 4__ NANO 1016 Introduction to Nanoscience* 3__ NANO

Crawford, T. Daniel

27

Charge transport in molecular devices. Nanoscience and nanotechologies: new science?  

E-Print Network (OSTI)

Charge transport in molecular devices. Nanoscience and nanotechologies: new science? Nanoscience and other developing countries are also joining in this scientific effort. What does nanoscience of an intrinsic nanoscale science that existed before "nanoscience". So we can now reformulate our question: what

Qian, Ning

28

The Department of Quantum Nanoscience within the Kavli Institute of Nanoscience at Delft University of Technology opens a position of  

E-Print Network (OSTI)

The Department of Quantum Nanoscience within the Kavli Institute of Nanoscience at Delft University description The department of Quantum Nanoscience invites applications for a professorship in "superconducting and application For more information about these positions, please contact the head of the Quantum Nanoscience

29

The Department of Quantum Nanoscience, part of the Kavli Institute of Nanoscience at the Delft University of Technology opens 2 positions of  

E-Print Network (OSTI)

The Department of Quantum Nanoscience, part of the Kavli Institute of Nanoscience at the Delft Nanoscience The department The department of Quantum Nanoscience, part of the Kavli Insitute of Nanoscience for two professors in Quantum Nanoscience. The candidates are expected to be, or on their way to become

30

Graduate School of Advanced Science and Engineering Department of Nanoscience and Nanoengineering  

E-Print Network (OSTI)

Graduate School of Advanced Science and Engineering Department of Nanoscience and Engineering Department of Nanoscience and Nanoengineering 2014/092015/04 1 Department of Nanoscience and Nanoengineering #12; Graduate School of Advanced Science and Engineering Department of Nanoscience

Kaji, Hajime

31

Chapter 1 - Nanoscience and Nanotechnology  

Science Journals Connector (OSTI)

Abstract Assuming that the reader is relatively new to the area of carbon nanotube reinforced composites, this chapter aims to create a solid background in the topics of nanoscience and nanotechnology (N&N). We start with an introduction to the nanoscale, from basic themes, such as the importance of size, and why the properties of materials change at the nanoscale. The concepts of N&N are presented from the starting point: the Feynmans lecture in 1959. The different types of nanotechnology are discussed. The history of nano shows us that nanotechnology was, somehow, already been used in the ancient world as demonstrated by great examples as the Lycurgus cup and stained glass windows. The nano world has inspired many applications that make use of the new features and phenomena observed at the nanoscale. We discuss some of the existing and envisioned applications in many areas, including medicine, food, electronics, energy, air pollution, space, and even sports. Finally, we take a look to the future and realize that although scientists are able to manipulate materials at the atomic scale, atom by atom, there is still much to be done, i.e., There is Plenty of Room at the Bottom!

Marcio Loos

2015-01-01T23:59:59.000Z

32

Prfungs-und Studienordnung fr den Bachelorstudiengang Nanoscience  

E-Print Network (OSTI)

Prüfungs- und Studienordnung für den Bachelorstudiengang Nanoscience an der Universität Regensburg Nanoscience an. 2 Die vorliegende Prüfungs- und Studienordnung regelt den Erwerb von Studien- und

Schubart, Christoph

33

Nanosciences : evolution or revolution ? Jean-Louis Pautrat  

E-Print Network (OSTI)

1 Nanosciences : evolution or revolution ? Jean-Louis Pautrat Physicist, former Director of Foundation "Nanosciences aux limites de la nanoélectronique" 23 rue des Martyrs, 38000 Grenoble Abstract

Paris-Sud XI, Université de

34

NanoSciences Fondation Post-doc Position 2010  

E-Print Network (OSTI)

NanoSciences Fondation Post-doc Position ­ 2010 Postdoctoral position on SQUID microscopy The SuperNanoCharac project of the NanoSciences Fondation (Grenoble, France) seeks outstanding candidates for a postdoctoral

Canet, Léonie

35

Prfungs-und Studienordnung fr den Bachelorstudiengang Nanoscience  

E-Print Network (OSTI)

Prüfungs- und Studienordnung für den Bachelorstudiengang Nanoscience an der Universität Regensburg

Schubart, Christoph

36

Les nanosciences : (r)volution des savoirs et des technologies ?  

E-Print Network (OSTI)

1 Les nanosciences : (r)évolution des savoirs et des technologies ? Jean-Louis Pautrat Physicien, ancien Directeur de la Fondation "Nanosciences aux limites de la nanoélectronique" 23 rue des Martyrs : miniaturisation ; microélectronique ; nanomatériaux ; nanosciences ; nanomédecine 1 - Introduction Tout « honnête

Boyer, Edmond

37

NORTHERN ILLINOIS UNIVERSITY Distinguished NanoScience Fellowship Application  

E-Print Network (OSTI)

NORTHERN ILLINOIS UNIVERSITY Distinguished NanoScience Fellowship Application Students should submit this form to the Nanoscience Fellowship Committee by the applicant advisor. Attach a brief summary of your performed and proposed research in nanoscience, together with a resume or curriculum vitae (if

Kostic, Milivoje M.

38

The Navy's Program in Nanoscience and Nanotechnology A Look Ahead  

E-Print Network (OSTI)

The Navy's Program in Nanoscience and Nanotechnology ­ A Look Ahead Robert Kavetsky Office of Naval anticipated in the early 1980s the possible opportunities nanoscience and nanotechnology might bring leadership in the arenas of nanoscience and nanotechnology through its coordination and collaboration

Maryland at College Park, University of

39

Foundations of Nanoscience Snowbird Cliff Lodge~Snowbird, Utah  

E-Print Network (OSTI)

Foundations of Nanoscience Snowbird Cliff Lodge~Snowbird, Utah April 21- 23, 2004. Self of Nanoscience Snowbird, Utah April 21- 23, 2004 Sponsor: Defense Advanced Research Projects Agency (DARPA) Self at the Conference "Foundations of Nanoscience: Self-Assembled Architectures and Devices" held in Snowbird, Utah

Reif, John H.

40

Genome Function and Nuclear Architecture: From Gene Expression to Nanoscience  

E-Print Network (OSTI)

Genome Function and Nuclear Architecture: From Gene Expression to Nanoscience Timothy P. O'Brien,1, and nanoscience approaches to the study of nuclear structure and activity have been developing recently and hold, and nanoscience to relate genome organization and nuclear archi- tecture with development and disease. Integrating

Langowski, Jörg

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

NANOSCIENCE @ UNIVERSITY OF NEW MEXICO FACILITIES USE AGREEMENT  

E-Print Network (OSTI)

NANOSCIENCE @ UNIVERSITY OF NEW MEXICO FACILITIES USE AGREEMENT This Facilities Use Agreement Service Center program sponsored by Nanoscience @ UNM. This Agreement establishes the terms and conditions under which User and/or User's employees and agents shall use the Nanoscience @ UNM laboratory

New Mexico, University of

42

Joint Institute for Nanoscience Annual Report 2003  

SciTech Connect

The Joint Institute for Nanoscience (JIN) is a cooperative venture of the University of Washington and Pacific Northwest National Laboratory to encourage and enhance high-impact and high-quality nanoscience and nanotechnology of all types. This first annual report for the JIN summarizes activities beginning in 2001 and ending at the close of fiscal year 2003 and therefore represents somewhat less than two years of activities. Major portions of the JIN resources are dedicated to funding graduate students and postdoctoral research associates to perform research in collaborations jointly directed by Pacific Northwest National Laboratory (PNNL) staff scientists and University of Washington (UW) professors. These fellowships were awarded on the basis of applications that included research proposals. JIN co-sponsors an annual Nanoscale Science and Technology Workshop held in Seattle. In addition to involving PNNL staff in various UW nanoscience courses and seminars, a National Science Foundation grant Development of UW-PNL Collaborative Curriculums in Nano-Science and Technology has allowed the development of three intensive short courses that are taught by UW faculty, PNNL staff, and faculty from other institutions, including Washington State University, the University of Idaho, Stanford University, and the University of Alaska. The initial JIN agreement recognized that expansion of cooperation beyond UW and PNNL would be highly valuable. Starting in early 2003, efforts were initiated to form a regional communication link called the Northwest Nanoscience and Nanotechnology Network (N?). In concept, N? is a tool to encourage communication and help identify regional resources and nanoscience and technology activities.

Baer, Donald R.; Campbell, Charles

2004-02-01T23:59:59.000Z

43

Nanoscience Faculty Position Virginia Tech is conducting an open-rank search in support of its new Nanoscience degree program  

E-Print Network (OSTI)

Nanoscience Faculty Position Virginia Tech is conducting an open-rank search in support of its new Nanoscience degree program (www.science.vt.edu/ais/nano), with the appointment to begin Fall 2014 at our focus in nanoscience; and teaching experience. Research areas of interest include, but are not limited

Virginia Tech

44

A comparative evaluation of low-cycle fatigue behavior of type 316LN base metal, 316 weld metal, and 316LN/316 weld joint  

SciTech Connect

A comparative evaluation of the low-cycle fatigue (LCF) behavior of type 316LN base metal, carried out at 773 and 873 K. Total strain-controlled LCF tests were conducted at a constant strain rate of 3 {times} 10{sup {minus}3} s{sup {minus}1} with strain amplitudes in the range {+-}0.20 to {+-}1.0 pct. Weld pads with single V and double V configuration were prepared by the shielded metal-arc welding (SMAW) process using 316 electrodes for weld-metal and weld-joint specimens. Optical microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) of the untested and tested samples were carried out to elucidate the deformation and the fracture behavior. The cyclic stress response of the base metal shows a very rapid hardening to a maximum stress followed by a saturated stress response. Weld metal undergoes a relatively short initial hardening followed by a gradual softening regime. Weld joints exhibit an initial hardening and a subsequent softening regime at all strain amplitudes, except at low strain amplitudes where a saturation regime is noticed. The initial hardening observed in base metal has been attributed to interaction between dislocations and solute atoms/complexes and cyclic saturation to saturation in the number density of slip bands. The 18-8 group of austenitic stainless steels, such as AISI type 316, 304, and their modified grades, finds applications as structural material for various components of the liquid-metal-cooled fast breeder reactor (LMFBR).

Valsan, M.; Sundararaman, D.; Sankara Rao, K.B.; Mannan, S.L. [Indira Gandhi Centre for Atomic Research, Tamil Nadu (India)

1995-05-01T23:59:59.000Z

45

Sandia National Labs: PCNSC: Research: Nanosciences  

NLE Websites -- All DOE Office Websites (Extended Search)

Nanosciences Nanosciences Throughout the scientific community, including Sandia National Laboratories (SNL), researchers say building things atom-by-atom or molecule-by-molecule will revolutionize the production of virtually every human-made object. Exciting prospects-but they also point out that the promise of nanotechnology can only be realized if we learn to understand the special rules that control behavior at this small scale and develop the skill needed to integrate these concepts into practical devices. The excitement stems from the understanding that the behavior of materials at the nanoscale is nothing like that at the large scale. The necessary tools, such as powerful new microscopes, have been developed to let researchers see these surprising behaviors. Sandia National Labs'

46

A Rubric for Post-Secondary Degree Programs in Nanoscience and  

E-Print Network (OSTI)

A Rubric for Post-Secondary Degree Programs in Nanoscience and Nanotechnology* SUPAPORN WANSOM,1 balance are discussed. Keywords: Nanoscience; nanotechnology; curriculum design; degree programs; course design INTRODUCTION NANOSCIENCE AND NANOTECHNOLOGY have important precedents in both the decorative arts

Bodner, George M.

47

Theory and modeling in nanoscience: Report of the May 10-11, 2002 Workshop  

E-Print Network (OSTI)

Theory and Modeling in Nanoscience Report of the May 1 0 - 1Theory and Modeling in Nanoscience Report of the May 10-11,Theory and Modeling in Nanoscience E. Consensus Observations

McCurdy, C. William; Stechel, Ellen; Cummings, Peter; Hendrickson, Bruce; Keyes, David

2002-01-01T23:59:59.000Z

48

UNDERGRADUATE JOURNAL IN NANOSCIENCE AND NANOTECHNOLOGY Professor Mark Hersam, editor; Kathleen Cook, managing editor  

E-Print Network (OSTI)

UNDERGRADUATE JOURNAL IN NANOSCIENCE AND NANOTECHNOLOGY Professor Mark Hersam, editor; Kathleen journal dedicated to nanoscience and nanotechnology. Aspiring authors went through a peer-review process

Shull, Kenneth R.

49

NEBRASKA CENTER FOR MATERIALS AND NANOSCIENCE & CENTER FOR NANOHYBRID FUNCTIONAL MATERIALS  

E-Print Network (OSTI)

NEBRASKA CENTER FOR MATERIALS AND NANOSCIENCE & CENTER FOR NANOHYBRID FUNCTIONAL MATERIALS PRESENT FOR MATERIALS AND NANOSCIENCE & CENTER FOR NANOHYBRID FUNCTIONAL MATERIALS PRESENT Graphene Colloquium

Farritor, Shane

50

Materials characterization of silicon carbide reinforced titanium (Ti/SCS-6) metal matrix composites. Part 2: Theoretical modeling of fatigue behavior  

SciTech Connect

Flexural fatigue behavior was investigated on titanium (Ti-15V-3Cr) metal matrix composites reinforced with cross-ply, continuous silicon carbide (SiC) fibers. The titanium composites had an eight-ply (0, 90, +45, {minus}45 deg) symmetric layup. Mechanistic investigation of the fatigue behavior is presented in Part 1 of this series. In Part 2, theoretical modeling of the fatigue behavior was performed using finite element techniques to predict the four stages of fatigue deflection behavior. On the basis of the mechanistic understanding, the fiber and matrix fracture sequence was simulated from ply to ply in finite element modeling. The predicted fatigue deflection behavior was found to be in good agreement with the experimental results. Furthermore, it has been shown that the matrix crack initiation starts in the 90 deg ply first, which is in agreement with the experimental observation. Under the same loading condition, the stress in the 90 deg ply of the transverse specimen is greater than that of the longitudinal specimen. This trend explains whey the longitudinal specimen has a longer fatigue life than the transverse specimen, as observed in Part 1.

Chiang, K.T.; Loh, D.H. [Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.; Liaw, P.K. [Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Diaz, E.S. [Westinghouse Science and Technology Center, Pittsburgh, PA (United States)

1995-12-01T23:59:59.000Z

51

Level MSc 2013/14 Nanoscience to Nanotechnology  

E-Print Network (OSTI)

Level MSc 2013/14 Nanoscience to Nanotechnology MSc Nanoscience to Nanotechnology Coordinator: Dr Nanoscale Structures and Devices 10 Credits Mr. TGG Maffeis/Dr. L Li/Dr. KS Teng EGNM02 Soft Nanotechnology Nano(geno)toxicology 10 Credits Dr. SH Doak EGNM05 Bio-nanotechnology 10 Credits Dr. CJ Wright PM-M23

Martin, Ralph R.

52

Argonne CNM Highlight: 2007 U.S.-France Nanoscience Workshop  

NLE Websites -- All DOE Office Websites (Extended Search)

Partnerships in Nanoscience Explored between France and the United States Partnerships in Nanoscience Explored between France and the United States During June 3-5, 2007, a group of 50 researchers and invited participants came together at Argonne National Laboratory for the France-U.S. Nanoscience Workshop. The purpose of this workshop was to help stimulate U.S.-France collaborations in nanoscience. Pat Dehmer, Associate Director for Science, U.S. Department of Energy (DOE), Office of Basic Energy Sciences, attended along with Linda Blevins, Technical and International Advisor. The importance of international collaboration and cooperation for solving critical issues in nanoscience and nanotechnology (e.g., in energy and information technology) was apparent. In yet another demonstration that international partnerships have always been important for the success of DOE laboratory-based research, participants from many of the DOE national laboratories were present.

53

Nanoscience: A historical perspective R. Dez Muio and P. M. Echenique  

E-Print Network (OSTI)

Nanoscience: A historical perspective R. Díez Muiño and P. M. Echenique Lecture Notes Fall 2007 #12;Nanoscience and reduced dimensionality ours is a three-dimensional (3D) world nanoscience reduces be 2D #12;Nanoscience: from 3D 0D CONFINEMENT!! 0D 1D ~nm ~nm ~nm 2D #12;four reasons to study surfaces

Muiño, Ricardo Díez

54

IEEE NANOSCIENCE and TECHNOLOGY BROWN BAG  

NLE Websites -- All DOE Office Websites (Extended Search)

PLEASE PLEASE JOIN US! NANOSCIENCE and TECHNOLOGY BROWN BAG Friday, 7 November 2008 Noon - 1 pm Columbia River Room (public access available) PNNL, ETB Building (Q Avenue, Richland, WA) speaker Dr. Meyya Meyyappan Chief Scientist for Exploration Technology, NASA Ames Research Center & IEEE Electron Devices Society Distinguished Lecturer presenting Nanotechnology in Chemical and Bio Sensor Systems Abstract: There are strong research programs in nanotechnology related to chemical sensors, electromechanical devices, actuators, biosensors, and other nanodevices in leading laboratories across the world which use nanomaterials and other molecularly-engineered approaches. In many cases, practical systems demand seamless integration of the nanodevice with higher order structures, for example, MEMS. Examples of this using carbon nanotube based chemical and biosensors

55

FATIGUE DESIGN CURVES FOR  

Office of Scientific and Technical Information (OSTI)

FATIGUE DESIGN CURVES FATIGUE DESIGN CURVES FOR 6061-T6 ALUMINUM* G . T . Yahr Engineering Technology Division Oak Ridge National Laboratory Oak Ridge, Tennessee 37831-8051 ABSTRACT A request has been made to the ASME Boiler and Pressure Vessel Committee that 6061-T6 aluminum be approved for use in the construction of Class 1 welded nuclear vessels so it can be used for the pressure vessel of the Advanced Neutron Source research reactor. Fatigue design curves with and without mean stress effects have been proposed. A knock-down factor of two is applied to the design curve for evaluation of welds. The basis of the curves is explained. The fatigue design curves are compared to fatigue data from base metal and weldments. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States

56

Intel / Charles E. Young Endowed Chair in Nanotechnology Director of the Nanoscience Institute for Medical and Engineering Technology  

E-Print Network (OSTI)

Intel / Charles E. Young Endowed Chair in Nanotechnology Director of the Nanoscience Institute of the Nanoscience Institute for Medical and Engineering Technology. The Intel Foundation established this endowment

Slatton, Clint

57

Nanoscience to nanotechnology to manufacturing transition  

Science Journals Connector (OSTI)

The primary focus of this review is on the transition of nanoscience to nanotechnology to manufacturing, specifically related to nanostructuring of materials for next-generation systems having superior performance. We start with the discussion of intrinsic advantages of nanoscale materials and systematic approach for transition into systems. As the feature (grain) size of solid-state materials decreases, the defect content reduces and below a critical size material can be defect-free. Since these critical sizes for most materials lie in 5-100 nm, there is a fundamental advantage and an unprecedented opportunity to realise the property of a perfect material. Along with this opportunity, there is a major challenge with respect to the large fraction of atoms at the interfaces, which must be engineered to realise the advantages of nanotechnology-based systems. We specifically address nanosystems based upon nanodots and nanolayered materials synthesised by thin film deposition techniques, where recurring themes include nanostructuring of materials to improve performance; thin film epitaxy across the misfit scale for orientation controls; control of defects, interfaces and strains; and integration of nanoscale devices with (100) silicon based microelectronics and nanoelectronics. The systems of interest are based upon strong novel structural materials, nanomagnetics for information storage, nanostructured or Nano Pocket LEDs, variety of smart structures based upon vanadium oxide and novel perovskites integrated with Si(100), and nanotechnology based solutions to enhance fuel efficiency and reduce environmental pollution.

Jagdish Narayan

2012-01-01T23:59:59.000Z

58

Journal of Experimental Nanoscience, Vol. 2, Nos. 12, MarchJune 2007, 311  

E-Print Network (OSTI)

Journal of Experimental Nanoscience, Vol. 2, Nos. 1­2, March­June 2007, 3­11 Arrays of Cu21 nm. *Corresponding author. Email: depicciottoa@mail.montclair.edu Journal of Experimental Nanoscience

Wissner-Gross, Alexander

59

Integrated Science Faculty in the College of Science Nanoscience, Neuroscience, Systems Biology, and  

E-Print Network (OSTI)

Integrated Science Faculty in the College of Science Nanoscience, Neuroscience, Systems Biology, and Computational Science !As part of Virginia Tech's expanding presence in emerging interdisciplinary programs and degrees in nanoscience, neuroscience, systems biology, and computational science, the College of Science

Virginia Tech

60

Nanoscience: A historical perspective R. Dez Muio and P. M. Echenique  

E-Print Network (OSTI)

#12;Nanoscience: A historical perspective R. Díez Muiño and P. M. Echenique Lecture Notes Fall 2007 economic, but scientific and social as well! #12;NANOMEDICINE #12;Source: US NIH Nanoscience and Medical and fighting disease. #12;Source: US NIH Nanoscience and Medical Research Two different aspects: - Medical

Muiño, Ricardo Díez

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Nanoscience This course explores the frontiers of science on the nanoscale. Many developing 21st  

E-Print Network (OSTI)

Nanoscience MSc/PgDip This course explores the frontiers of science on the nanoscale. Many and behaviours of systems in this submicrometrescale size domain. The multidisciplinary nature of nanoscience. The projects take place primarily in research labs associated with nanoscience located in the University

Strathclyde, University of

62

WORKING DOCUMENT for ISC -DRAFT -October 11th "Nanosciences, Nanotechnologies, Materials and new  

E-Print Network (OSTI)

WORKING DOCUMENT for ISC - DRAFT - October 11th 2006 Theme 4 "Nanosciences, Nanotechnologies ------------------------------------------------------------------------------- Table of contents I Context 1 II Content of Calls 5 Nanosciences and Nanotechnologies 7 Materials 18 New "Nanosciences, Nanotechnologies, Materials and new Production Technologies ­ NMP" is to fund research

Meju, Max

63

Observing nanoscience and technology worldwide Newsletter n2, February 2009 Stephan Roche www.nanotrendchart.com  

E-Print Network (OSTI)

Observing nanoscience and technology worldwide Newsletter n°2 of the 35 largest districts worldwide. Studying nano-districts gives a new view on nanoscience Data from 200 represented. Interestingly, al- though activity in nanoscience is concentrated in a limited number of areas

Paris-Sud XI, Université de

64

WORKING DOCUMENT -DRAFT -September 12th "Nanosciences, Nanotechnologies, Materials and new  

E-Print Network (OSTI)

WORKING DOCUMENT - DRAFT - September 12th 2006 Theme 4 "Nanosciences, Nanotechnologies, Materials ------------------------------------------------------------------------------- Table of contents I. Context 1 II. Content of Calls 5 Nanosciences and Nanotechnologies 7 Materials 15 - September 12th 2006 I Context I.1 Policy context Theme 4 "Nanosciences, Nanotechnologies, Materials and new

Meju, Max

65

Nanoscience: A historical perspective R. Dez Muio and P. M. Echenique  

E-Print Network (OSTI)

Nanoscience: A historical perspective R. Díez Muiño and P. M. Echenique Lecture Notes Fall 2007 #12. Ichihashi, Nature 363, 603 (1993) D. S. Bethune et al., Nature 363, 605 (1993) #12;#12;Nanoscience has been as nanoscience for example. Nanotechnology on the other hand should incorporate a manufacturing process

Muiño, Ricardo Díez

66

CHEM/CH EN 5810 Nanoscience: Where Biology, Chemistry, and Physics Intersect  

E-Print Network (OSTI)

1 CHEM/CH EN 5810 Nanoscience: Where Biology, Chemistry, and Physics Intersect Spring Semester for the course. Canvas Course Website: https://utah.instructure.com/courses/220783 Course Theme: Nanoscience properties that are being discovered every day. Nanoscience is therefore an interdisciplinary research field

Simons, Jack

67

Microsoft Word - France-US Nanoscience agenda_FINAL.doc  

NLE Websites -- All DOE Office Websites (Extended Search)

France - U.S. Nanoscience Workshop France - U.S. Nanoscience Workshop Argonne National Laboratory June 3-5, 2007 APS 401, Room A1100 SUNDAY, June 3 7:30 Bus departures begin from Argonne Guest House (APS 401 is also in walking distance) 8:00-9:00 Registration in APS Atrium 8:00-9:00 Continental Breakfast Welcome and Introduction 9:00 Welcome to Argonne Eric Isaacs 9:10 DOE Overview Pat Dehmer 9:40 CNRS Overview Didier Stiévenard and Alain Fontaine "Center of Competence of Nanosciences in France" 10:00 CEA Overview Jean-Philippe Bourgoin 10:15 Break Electronic and Magnetic Properties Eric Isaacs, Presiding 10:30 Bruno Grandidier (IEMN, CNRS, Lille) "Linewidths in Tunneling Spectroscopy of Semiconducting Nanocrystals" 11:00 Philippe Guyot Sionnest (University of Chicago)

68

Fracture toughness and fatigue-crack propagation in a ZrTiNiCuBe bulk metallic glass  

E-Print Network (OSTI)

growth and fracture toughness behavior, representing the conditions governing the subcritical amorphous alloy was also found to be susceptible to fatigue-crack growth under cyclic loading, with growth are thus available on the toughness and cyclic crack growth properties in these alloys. Accord- ingly

Ritchie, Robert

69

Real-time, high-resolution study of nanocrystallization and fatigue cracking in a cyclically strained metallic glass  

E-Print Network (OSTI)

Metallic glasses (MGs) exhibit greater elastic limit and stronger resistance to plastic deformation than their crystalline metal counterparts. Their capacity to withstand plastic straining is further enhanced at submicrometer ...

Wang, Cheng-Cai

70

New Asphaltene Nanoscience and Its Impact on Reservoir Characterization  

NLE Websites -- All DOE Office Websites (Extended Search)

Asphaltene Nanoscience and Its Impact on Asphaltene Nanoscience and Its Impact on Reservoir Characterization Oliver C. Mullins Schlumberger-Doll Research, 1 Hampshire St., Cambridge, MA 02139, USA Crude oils consist of gases, liquids and solids, the asphaltenes. The gas and liquid constituents of crude oil are chemically well understood and their theoretical frame work can be satisfactorily treated by cubic equations of state. In contrast, the asphaltene have been grossly misunderstood precluding any theoretical treatment of asphaltene gradients in reservoirs. In recent years, asphaltene science has undergone a renaissance with many of the advances being subsumed in the "Yen-Mullins model" (named by Professor Zare at Stanford U.) which consists of asphaltene molecules, nanoaggregates and clusters of

71

Nanoscience and nanotechnologies: hopes and concerns Investigation of matter at the nanoscale (one billionth of a meter i.e. the size of an aggregate of a few  

E-Print Network (OSTI)

Nanoscience and nanotechnologies: hopes and concerns FOREWORD Investigation of matter to draw patterns. The "nano" concept, which includes nanosciences and nanotechnologies, is born from the point of view of the scientific community, nanosciences are "activities aimed at producing knowledge

Paris-Sud XI, Université de

72

PhD position in trapped ion quantum technology and nanoscience at the University of Sussex, Brighton, UK  

E-Print Network (OSTI)

PhD position in trapped ion quantum technology and nanoscience at the University of Sussex a quantum computer with trapped ions. Research in the group focuses on the borderland of nanoscience

Hensinger, Winfried

73

SCIENTIFIC REPORT 2001-2003 NEST, the National Enterprise for nanoScience and nanoTechnology, was established  

E-Print Network (OSTI)

SCIENTIFIC REPORT 2001-2003 NEST, the National Enterprise for nanoScience and nano of nanoscience and to become a reference point and a resource for the INFM community. As stated in its original

Abbondandolo, Alberto

74

NSF Workshop on Emerging Opportunities of Nanoscience to Energy Conversion and Storage  

E-Print Network (OSTI)

NSF Workshop on Emerging Opportunities of Nanoscience to Energy Conversion and Storage Download PDF: Nanoelectronics for Energy Conversion by Stuart Lindsay Section 6: BioNano Techniques for Energy Applications by T:NationalScienceFoundation(NSF)Sponsoredby:NationalScienceFoundation(NSF) #12;#12;NSF Workshop on Emerging Opportunities of Nanoscience to Energy Conversion and Storage Summary

Reif, John H.

75

Submitted to the Journal of Nanoscience and Nanotechnology, 2001. Effects of Nanometer Thick Passivation Layers on the  

E-Print Network (OSTI)

Submitted to the Journal of Nanoscience and Nanotechnology, 2001. Effects of Nanometer Thick concerned with the #12;Submitted to the Journal of Nanoscience and Nanotechnology, 2001. fact that devices. These effects all give rise to stresses in the #12;Submitted to the Journal of Nanoscience and Nanotechnology

Espinosa, Horacio D.

76

4.3.2 DEVELOPMENT OF MUSEUM EXHIBIT ON NANOSCIENCE & NANOTECHNOLOGY Barry Aprison, Museum of Science & Industry, Chicago  

E-Print Network (OSTI)

4.3.2 DEVELOPMENT OF MUSEUM EXHIBIT ON NANOSCIENCE & NANOTECHNOLOGY Barry Aprison, Museum on nanoscience and nanotechnology. Approximately 20,000 square feet of space at MSI (currently part of Grainger for the Nanoverse exhibit on nanoscience and nanotechnology #12;

Shull, Kenneth R.

77

"We're not in Kansas Anymore!" -A Hands-on Introduction to Nanoscience MEMs and Microfabrication  

E-Print Network (OSTI)

"We're not in Kansas Anymore!" - A Hands-on Introduction to Nanoscience MEMs and Microfabrication-on Introduction to Nanoscience It's now about a lot more, including "Micro-electro-mechanical Systems (MEMS're not in Kansas Anymore!" - A Hands-on Introduction to Nanoscience Alignment Clip Used in conjunction

Smy, Tom

78

Effect on the condition of the metal in A K-300-3.5 turbine owing to multicycle fatigue from participation of a power generating unit in grid frequency and power regulation  

SciTech Connect

The effect on the condition of the rotor material owing to multicycle fatigue caused by variable stresses during participation of a power generating unit in grid frequency and power regulation is evaluated using the K-300-23.5 steam turbine as an example. It is shown that during normalized primary frequency regulation the safety factor is at least 50, while during automatic secondary regulation of frequency and power there is essentially no damage to the metal.

Lebedeva, A. I.; Zorchenko, N. V.; Prudnikov, A. A.

2011-09-15T23:59:59.000Z

79

Sp ring 2 0 1 3 Science Art co m p etitio n Sponsored by the Nebraska Center for Materials and Nanoscience  

E-Print Network (OSTI)

and Nanoscience TITLE: The Art of NanoScience 2013 PURPOSE: To celebrate the aesthetic appeal and creativity of nanoscience CRITERIA: The artwork must be in the form of a static visual image that portrays or represents nanoscience research at the University of Nebraska. It may be based on calculations, on imaging data

Farritor, Shane

80

Effects of plastic constraint on the cyclic and static fatigue behavior of metal/ceramic layered structures  

E-Print Network (OSTI)

of studies have reported on the corresponding subcritical crack-growth properties, specifically involving of metal/ceramic layered structures is examined under cyclic and static loading conditions. Crack-growth loading, crack growth occurred primarily at the interface separating the two materials; additionally

Kruzic, Jamie

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Communiqu : Inauguration du btiment 11 E, un quipement de recherche ddi aux nanosciences sur le campus de Beaulieu  

E-Print Network (OSTI)

- 1 - Communiqué : Inauguration du bâtiment 11 E, un équipement de recherche dédié aux nanosciences campus de Beaulieu. Dédié aux nanosciences, cet équipement de recherche, financé dans le cadre d auto-assemblages bio-inspirés. Les nanosciences sont l'étude de la matière à l'échelle du nanomètre

Rennes, Université de

82

Current Nanoscience, 2011, 7, 667-673 667 1573-4137/11 $58.00+.00 2011 Bentham Science Publishers  

E-Print Network (OSTI)

Current Nanoscience, 2011, 7, 667-673 667 1573-4137/11 $58.00+.00 © 2011 Bentham Science Publishers

Nielsen, Steven O.

83

2002 IEEE/ASEE Frontiers in Education Meeting, Boston MA The Creation of Web-Based Interactive Virtual Experiments on Microelectronics and Nanoscience  

E-Print Network (OSTI)

Virtual Experiments on Microelectronics and Nanoscience for Early Engineering Students John C. Bean and nanoscience though the use of web-based "Virtual Experiments." The website allows students to explore

Bean, John C.

84

I. NANOSCIENCE COURSE REQUIREMENTS CR A. Communication Skills (8 cr.) CR APSC-101 Applied Science Profession I 1 ENGL-101 Freshman English Composition Required OR 3  

E-Print Network (OSTI)

I. NANOSCIENCE COURSE REQUIREMENTS CR A. Communication Skills (8 cr.) CR APSC-101 Applied Science OF SCIENCE Concentration in Nanoscience University of Wisconsin-Stout 2010-2011 #12;I. MATERIALS SCIENCE

Wu, Mingshen

85

A Model of Metal Fatigue  

Science Journals Connector (OSTI)

... This random distribution of slip will roughen the surface, each part of which is engaged in a random walk along the ... each part of which is engaged in a random walk along the slip vector. This roughening will lead to a re-distribution of the stress, so that in later cycles ...

A. N. MAY

1960-01-30T23:59:59.000Z

86

Effects of Glass-Forming Metallic Film on the Fatigue Behavior of C-2000 Ni-Based Alloy , C. L. Chiang1,2  

E-Print Network (OSTI)

, glass-forming films are anticipated to be ideal coating materials to improve the fatigue resistance , C. L. Chiang1,2 , J. P. Chu2 , Y. F. Gao1 , and P. K. Liaw1 1 Dept. Materials Science & Engrg., The University of Tennessee, Knoxville, TN 37996, U.S.A. 2 Institute of Materials Engineering, National Taiwan

Gao, Yanfei

87

LivingColorGerdaSteiner&JrgLenzlinger-LeTempssuspendu#4HichamBerrada-LaRgledetroisStfanePerraud QUAND LES NANOSCIENCES RENCONTRENT L'ART CONTEMPORAIN  

E-Print Network (OSTI)

Berrada-LaRègledetroisStéfanePerraud QUAND LES NANOSCIENCES RENCONTRENT L'ART CONTEMPORAIN 23.09.2011 > 16.12.2011 EXPOSITION ORGANIS?E DANS Pierre et Marie Curie (UPMC), CNRS, NanoSciences Ile-de-France ____________ / VERNISSAGE / 22.09.2011 / ? nanosciences. Les nanosciences constituent aujourd'hui un domaine de la recherche scientifique à caractère

van Tiggelen, Bart

88

Profile of Professor of High-Resolution Electron Microscopy for Nanomaterials in the Quantum Nanoscience department (Kavli Institute, faculty of Applied Sciences)  

E-Print Network (OSTI)

Nanoscience department (Kavli Institute, faculty of Applied Sciences) Workload and duration The Quantum Nanoscience department is planning to appoint a permanent full-time professor in the research area of High the High-Resolution Electron Microscopy (HREM) group in the Quantum Nanoscience department at TU Delft

89

2836 2011 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheimwileyonlinelibrary.com small 2011, 7, No. 20, 28362839 Nanoscience  

E-Print Network (OSTI)

, 2836­2839 essay Nanoscience Introduction: Defining the Field Various definitions of the fields of nanoscience and nano- technology have been widely debated in the literature.[1] Despite the accusations- ence of nanoscience and nanotechnology on long-established fields in the pure and applied sciences

Zhang, Minghua

90

Elevated temperature biaxial fatigue. Final Report  

SciTech Connect

A 3 year experimental program for studying elevated temperature biaxial fatigue of a nickel based alloy Hastelloy-X has been completed. A new high temperature fatigue test facility with unique capabilities has been developed. Effort was directed toward understanding multiaxial fatigue and correlating the experimental data to the existing theories of fatigue failure. The difficult task of predicting fatigue lives for nonproportional loading was used as an ultimate test for various life prediction methods being considered. The primary means of reaching improved understanding were through several critical nonproportional loading experiments. The direction of cracking observed on failed specimens was also recorded and used to guide the development of the theory. Cyclic deformation responses were permanently recorded digitally during each test. It was discovered that the cracking mode switched from primarily cracking on the maximum shear planes at room temperature to cracking on the maximum normal strain planes at 649 C. In contrast to some other metals, loading path in nonproportional loading had little effect on fatigue lives. Strain rate had a small effect on fatigue lives at 649 C. Of the various correlating parameters the modified plastic work and octahedral shear stress were the most successful.

Jordan, E.H.

1985-10-01T23:59:59.000Z

91

Theory and modeling in nanoscience: Report of the May 10-11, 2002Workshop  

SciTech Connect

On May 10 and 11, 2002, a workshop entitled ''Theory and Modeling in Nanoscience'' was held in San Francisco, California, sponsored by the offices of Basic Energy Science and Advanced Scientific Computing Research of the Department of Energy. The Basic Energy Sciences Advisory Committee and the Advanced Scientific Computing Advisory Committee convened the workshop to identify challenges and opportunities for theory, modeling, and simulation in nanoscience and nanotechnology, and additionally to investigate the growing and promising role of applied mathematics and computer science in meeting those challenges. This report is the result of those contributions and the discussions at the workshop.

McCurdy, C. William; Stechel, Ellen; Cummings, Peter; Hendrickson, Bruce; Keyes, David

2002-06-28T23:59:59.000Z

92

DATE: NVLAP LAB CODE: FASTENERS AND METALS APPLICATION (REV. 2012-05-04) PAGE 1 OF 22  

E-Print Network (OSTI)

Embrittlement Hydrogen embrittlement (stress durability) of externally threaded fasteners Hydrogen embrittlement for embrittlement of metallic coated externally threaded fasteners Fatigue Fatigue of full-size threaded fasteners

93

The Hebrew University Center for Nanoscience and Nanotechnology UHUJ Nano-Art  

E-Print Network (OSTI)

The Hebrew University Center for Nanoscience and Nanotechnology UHUJ Nano-Art Annual Conference of art based on nanotechnology. Prizes will be awarded to top three selected works. Nano-Art features nanolandscapes, natural or manmade structures of matter at the nano scale, e.g., molecular and atomic scales

Einat, Aharonov

94

The Hebrew University Center for Nanoscience and Nanotechnology UHUJ Nano-Art  

E-Print Network (OSTI)

The Hebrew University Center for Nanoscience and Nanotechnology UHUJ Nano-Art Annual Conference of works of art based on nanotechnology. Prizes will be awarded to top three selected works. Nano-Art features nanolandscapes, natural or manmade structures of matter at the nano (sub- micro) scale, e

Simon, Emmanuel

95

Fees are subject to change. See studyguide.au.dk PHYSICS, MATHEMATICS AND NANOSCIENCE INTERNATIONAL STUDY GUIDE 2014  

E-Print Network (OSTI)

, nanocatalysis, nanobiotechnology, nanomedicine, nano- food, toxicology, and ethical aspects of nanotechnology- velopment work in both public and private sectors in medicine, the environment, biotechnology biology, working in the field of nanoscience and nanotechnology. iNANO promotes excellent science

96

Big Thinking: The Power of Nanoscience (LBNL Science at the Theater)  

SciTech Connect

Science at the Theater, June 6th, 2011: Berkeley Lab scientists reveal how nanoscience will bring us cleaner energy, faster computers, and improved medicine. Alex Weber-Bargioni: How can we see things at the nanoscale? Alex is pioneering new methods that provide unprecedented insight into nanoscale materials and molecular interactions. The goal is to create rules for building nanoscale materials. Babak Sanii: Nature is an expert at making nanoscale devices such as proteins. Babak is developing ways to see these biological widgets, which could help scientists develop synthetic devices that mimic the best that nature has to offer. Ting Xu: How are we going to make nanoscale devices? A future in which materials and devices are able to assemble themselves may not be that far down the road. Ting is finding ways to induce a wide range of nanoscopic building blocks to assemble into complex structures. Delia Milliron: The dividends of nanoscience could reshape the way we live, from smart windows and solar cells to artificial photosynthesis and improved medical diagnosis. Delia is at the forefront of converting fundamental research into nanotechnology. Moderated by Jim DeYoreo, interim director of the Molecular Foundry, a facility located at Berkeley Lab where scientists from around the world address the myriad challenges in nanoscience.

Milliron, Delia; Sanili, Babak; Weber-Bargioni, Alex; Xu, Ting

2011-06-06T23:59:59.000Z

97

Triplet supercurrents in clean and disordered half-metallic ferromagnets  

E-Print Network (OSTI)

ARTICLES Triplet supercurrents in clean and disordered half-metallic ferromagnets MATTHIAS ESCHRIG Nanostructures, Universit¨at Karlsruhe, D-76128 Karlsruhe, Germany Present address: Department of Microtechnology and Nanoscience, Chalmers University of Technology, S-412 96 G¨oteborg, Sweden *e-mail: eschrig

Loss, Daniel

98

A Summary of the Fatigue Properties of Wind Turbine Materials  

SciTech Connect

Modern wind turbines are fatigue critical machines that are typically used to produce electrical power from the wind. The materials used to construct these machines are subjected to a unique loading spectrum that contains several orders of magnitude more cycles than other fatigue critical structures, e.g., an airplane. To facilitate fatigue designs, a large database of material properties has been generated over the past several years that is specialized to materials typically used in wind turbines. In this paper, I review these fatigue data. Major sections are devoted to the properties developed for wood, metals (primarily aluminum) and fiberglass. Special emphasis is placed on the fiberglass discussion because this material is current the material of choice for wind turbine blades. The paper focuses on the data developed in the U.S., but cites European references that provide important insights.

SUTHERLAND, HERBERT J.

1999-10-07T23:59:59.000Z

99

Effects of light water reactor coolant environment on the fatigue lives of  

NLE Websites -- All DOE Office Websites (Extended Search)

Effects of light water reactor coolant environment on the fatigue lives of Effects of light water reactor coolant environment on the fatigue lives of reactor materials July 8, 2013 A metal component can become progressively degraded, and its structural integrity can be adversely impacted when it is subjected to repeated fluctuating loads, or fatigue loading. Fatigue loadings on nuclear reactor pressure vessel components can occur because of changes in pressure and temperature caused by transients during operation, such as reactor startup or shutdown and turbine trip events. The American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code recognizes fatigue as a possible cause of failure of reactor materials and provides rules for designing nuclear power plant components to avoid fatigue failures. For various materials, the ASME Code defines the

100

Fatigue crack growth testing of sub-clad defects  

SciTech Connect

Fatigue crack growth tests were performed on four-point bend specimens with cracklike defects intentionally placed in A302B low-alloy pressure vessel steel clad with 308/309L weld-deposited stainless steel. The defects were placed in the base metal under the cladding by machining a cavity from the side opposite the cladding, electric-discharge machining a very sharp flaw, fatigue precracking the flaw, and then filling up the cavity by a weld repair process. The specimens were stress relieved before fatigue testing. The specimens were fatigue cycled at positive load ratios until the defects broke through to the surface. The specimens were then fractured at liquid nitrogen temperatures to reveal the fracture surfaces. Seven different sub-clad flaw specimens were tested in room temperature air and each test provides a record of cycles to defect breakthrough. Changes in defect size and shape as a function of applied load cycles were obtained by beach-marking the crack at various stages of the load history. The results provide a set of embedded defect data which can be used for qualifying fatigue crack growth analysis procedures such as those in Section XI of the ASME boiler and Pressure Vessel Code. A comparison between calculated and measured values shows that the ASME B and PV Section XI fatigue crack growth procedures conservatively predict cycles to defect breakthrough for small sub-clad defects.

Jones, D.P.; Leax, T.R. [Bechtel Bettis, Inc., West Mifflin, PA (United States). Bettis Atomic Power Lab.

1999-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

An Evaluation of Impacts in "Nanoscience & nanotechnology:" Steps towards standards for citation analysis  

E-Print Network (OSTI)

One is inclined to conceptualize impact in terms of citations per publication, and thus as an average. However, citation distributions are skewed, and the average has the disadvantage that the number of publications is used in the denominator. Using hundred percentiles, one can integrate the normalized citation curve and develop an indicator that can be compared across document sets because percentile ranks are defined at the article level. I apply this indicator to the set of 58 journals in the ISI Subject Category of "Nanoscience & nanotechnology," and rank journals, countries, cities, and institutes using non-parametric statistics. The significance levels of results can thus be indicated. The results are first compared with the ISI-Impact Factors, but this Integrated Impact Indicator (I3) can be used with any set downloaded from the (Social) Science Citation Index. The software is made publicly available at the Internet. Visualization techniques are also specified for evaluation by positioning institut...

Leydesdorff, Loet

2011-01-01T23:59:59.000Z

102

The delineation of nanoscience and nanotechnology in terms of journals and patents: a most recent update  

E-Print Network (OSTI)

The journal set which provides a representation of nanoscience and nanotechnology at the interfaces among applied physics, chemistry, and the life sciences is developing rapidly because of the introduction of new journals. The relevant contributions of nations can be expected to change according to the representations of the relevant interfaces among journal sets. In the 2005 set the position of the USA decreased more than in the 2004-set, while the EU-27 gained in terms of its percentage of world share of citations. The tag "Y01N" which was newly added to the EU classification system for patents, allows for the visualization of national profiles of nanotechnology in terms of relevant patents and patent classes.

Leydesdorff, Loet

2009-01-01T23:59:59.000Z

103

Ankle mechanical impedance under muscle fatigue .  

E-Print Network (OSTI)

??This study reports the effects of ankle muscle fatigue on ankle mechanical impedance. It suggests that decreasing ankle impedance with muscle fatigue may contribute to (more)

Wang, Shuo, S.B. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

104

Fatigue as a Design Limitation  

Science Journals Connector (OSTI)

...corrodent giving trouble in marine applications such as ships and...reducing fatigue strength in a marine propeller shaft steel. These...chosen both for corrosion and wear resistance and is often used...on the corrosion fatigue of marine propeller shafts. International...

1976-01-01T23:59:59.000Z

105

Reversal bending fatigue testing  

SciTech Connect

Embodiments for apparatuses for testing reversal bending fatigue in an elongated beam are disclosed. Embodiments are configured to be coupled to first and second end portions of the beam and to apply a bending moment to the beam and create a pure bending condition in an intermediate portion of the beam. Embodiments are further configured to cyclically alternate the direction of the bending moment applied to the beam such that the intermediate portion of the beam cyclically bends in opposite directions in a pure bending condition.

Wang, Jy-An John; Wang, Hong; Tan, Ting

2014-10-21T23:59:59.000Z

106

Influences of semiconductor morphology on the mechanical fatigue behavior of flexible organic electronics  

SciTech Connect

The influence of crystalline morphology on the mechanical fatigue of organic semiconductors (OSCs) was investigated using 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) as a crystalline OSC and poly(triarylamine) (PTAA) as an amorphous OSC. During cyclic bending, resistances of the OSCs were monitored using the transmission-line method on a metal-semiconductor-metal structure. The resistance of the TIPS-pentacene increased under fatigue damage in tensile-stress mode, but no such degradation was observed in the PTAA. Both OSCs were stable under compressive bending fatigue. The formation of intergranular cracks at the domain boundaries of the TIPS-pentacene was responsible for the degradation of its electrical properties under tensile bending fatigue.

Lee, Young-Joo; Yeon, Han-Wool; Shin, Hae-A-Seul; Joo, Young-Chang, E-mail: ycjoo@snu.ac.kr [Department of Materials Science and Engineering, Seoul National University, 151-744 Seoul (Korea, Republic of)] [Department of Materials Science and Engineering, Seoul National University, 151-744 Seoul (Korea, Republic of); Uk Lee, Yong; Evans, Louise A. [Center for Process Innovation Limited, Thomas Wright Way, NETPark, Sedgefield, TS21 3FG County Durham (United Kingdom)] [Center for Process Innovation Limited, Thomas Wright Way, NETPark, Sedgefield, TS21 3FG County Durham (United Kingdom)

2013-12-09T23:59:59.000Z

107

J. Comput. Theor. Nanosci. Vol. 1, No. 1 2004 2004 by American Scientific Publishers 1546-198X/2004/01/0029/011/$17.00+.25 doi:10.1166/jctn.2004.004 29 *Author to whom correspondence should be addressed.  

E-Print Network (OSTI)

J. Comput. Theor. Nanosci. Vol. 1, No. 1 2004 © 2004 by American Scientific Publishers 1546-198X be addressed. RESEARCHARTICLE JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE Vol. 1. 29­40, 2004

Ghoniem, Nasr M.

108

High temperature low-cycle fatigue of friction welded joints - type 304-304 stainless steel and alloy 718-718 nickel base superalloy  

SciTech Connect

This paper assesses the high-temperature low-cycle fatigue of the Type 304 stainless steel and Alloy 718 superalloy friction-welded joints. Strain controlled low-cycle fatigue tests for 304-304 and 718-718 friction-welded specimens were carried out at 923 K in air to obtain the fatigue strength of the joints. These materials were selected as the cyclic hardening and softening materials, respectively. The 304-304 welded specimens showed inferior fatigue strength in comparison with the base metal while the 718-718 specimens exhibited fatigue strength equivalent to that of the base metal. The difference in the fatigue strength between the two materials is discussed from the viewpoint of the cyclic deformation behavior and strain reduction at weld interface.

Wakai, T. (Power Reactor and Nuclear Fuel Development Corp., Ibaraki (Japan). Oarai Engineering Center); Sakane, M.; Ohnami, M. (Ritsumeikan Univ., Kyoto (Japan). Dept. of Mechanical Engineering); Okita, K. (Hyogo Prefectural Inst. of Industrial Research, Miki (Japan). Technical Center for Machinery and Metals); Fukuchi, Y. (Hyogo Prefectural Inst. of Industrial Research, Kobe (Japan))

1993-01-01T23:59:59.000Z

109

DAVID L. MCDOWELL Regents' Professor and Carter N. Paden, Jr. Distinguished Chair in Metals Processing  

E-Print Network (OSTI)

.L., "Microstructure-Sensitive Modeling and Simulation of Fatigue," ASM Handbook on Fundamentals of Modeling for Metals Processing, Handbook Vol. 22A,

Das, Suman

110

Doctopic: Nanoscience ARTICLE IN PRESS PLA:18767 Please cite this article in press as: A.V. Lukyanov, Physics Letters A (2009), doi:10.1016/j.physleta.2009.04.005  

E-Print Network (OSTI)

Doctopic: Nanoscience ARTICLE IN PRESS PLA:18767 Please cite this article in press as: A: Nanoscience [m5G; v 1.81; Prn:9/04/2009; 11:49] P.1 (1-5) Physics Letters A ··· (····) ···­··· Contents lists

Lukyanov, Alex

111

Statistics of the Coulomb-blockade peak spacings of a silicon quantum dot Center for NanoScience and Sektion Physik, LMU Munchen, Geschwister-Scholl-Platz 1, D-80539 Munchen, Germany  

E-Print Network (OSTI)

Statistics of the Coulomb-blockade peak spacings of a silicon quantum dot F. Simmel Center for NanoScience-Magder* Center for NanoScience and Sektion Physik, LMU Mu¨nchen, Geschwister-Scholl-Platz 1, D-80539 Mu, Cambridge, Massachusetts 02139 J. P. Kotthaus Center for NanoScience and Sektion Physik, LMU Mu

Ludwig-Maximilians-Universität, München

112

Fatigue monitoring desktop guide  

SciTech Connect

The development of a program for managing material aging (MMG) in the nuclear industry requires a new and different perspective. The classical method for MMG is cycle counting, which has been shown to have limited success. The classical method has been successful in satisfying the ductile condition per the America Society of Mechanical Engineers' (ASME) design criteria. However, the defined material failure mechanism has transformed from through-wall cracking and leakage (ASME) to crack initiation (NUREG-6909). This transformation is based on current industry experience with material degradation early in plant life and can be attributed to fabrication issues and environment concerns where cycle counting has been unsuccessful. This new perspective provides a different approach to cycle counting that incorporates all of the information about the material conditions. This approach goes beyond the consideration of a static analysis and includes a dynamic assessment of component health, which is required for operating plants. This health definition should consider fabrication, inspections, transient conditions and industry operating experience. In addition, this collection of information can be transparent to a broader audience that may not have a full understanding of the system design or the potential causes of early material degradation. This paper will present the key points that are needed for a successful fatigue monitoring desktop guide. (authors)

Woods, K. [InnoTech Engineering Solutions, LLC (United States); Thomas, K. [Nebraska Public Power District (United States)

2012-07-01T23:59:59.000Z

113

Ankle mechanical impedance under muscle fatigue  

E-Print Network (OSTI)

This study reports the effects of ankle muscle fatigue on ankle mechanical impedance. It suggests that decreasing ankle impedance with muscle fatigue may contribute to an increased probability of ankle injury. If confirmed, ...

Wang, Shuo, S.B. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

114

Modeling of fatigue for cellular materials  

SciTech Connect

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

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

1998-12-31T23:59:59.000Z

115

Fatigue analysis for double hull VLCC  

SciTech Connect

This paper presents the procedure and the results of fatigue analysis forming a part of Dynamic Load Approach (DLA) applied for 280,000 DWT double hull VLCC, classed with DLA notation by American Bureau of Shipping. The spectral fatigue analysis is applied to the above vessel, and the fatigue strength is confirmed to be sufficient.

Kawachi, S.; Kushima, T.; Negayama, H.; Shigematsu, K. [Sumitomo Heavy Industries, Ltd., Yokosuka (Japan)

1994-12-31T23:59:59.000Z

116

Peridynamic model for fatigue cracking.  

SciTech Connect

The peridynamic theory is an extension of traditional solid mechanics in which the field equations can be applied on discontinuities, such as growing cracks. This paper proposes a bond damage model within peridynamics to treat the nucleation and growth of cracks due to cyclic loading. Bond damage occurs according to the evolution of a variable called the %22remaining life%22 of each bond that changes over time according to the cyclic strain in the bond. It is shown that the model reproduces the main features of S-N data for typical materials and also reproduces the Paris law for fatigue crack growth. Extensions of the model account for the effects of loading spectrum, fatigue limit, and variable load ratio. A three-dimensional example illustrates the nucleation and growth of a helical fatigue crack in the torsion of an aluminum alloy rod.

Silling, Stewart A.; Abe Askari (Boeing)

2014-10-01T23:59:59.000Z

117

Titanium in fatigue critical military aircraft structure  

SciTech Connect

This paper discusses the effect of fatigue requirements on titanium structure in military aircraft applications, specifically, fighter aircraft. The discussion covers how fatigue affects the design and analysis of detail parts, and how manufacturing processes affect the fatigue performance of titanium structure. Criteria for designing fighter aircraft have evolved from simple strength calculations to extremely complex computer generated analyses involving strength, durability, damage tolerance and fatigue. Fatigue life prediction is an important part of these analyses and dramatically affects the design and weight of fighter aircraft. Manufacturing processes affect fatigue performance both in a positive and negative manner. Designers must allow for the effect of these processes on titanium structure and consider the efficiency and economy of adding processes that increase fatigue life.

Gillespie, F.

1999-07-01T23:59:59.000Z

118

Fatigue and delayed brittle failure of vacuum melted and cadmium plated steel  

Science Journals Connector (OSTI)

The detrimental effect of cyanide cadmium plating on fatigue strength and delayed brittle failure performance of an ultra high strength steel is reduced effectively by using vacuum melted steel as the basis metal. This phenomenon has been related predominantly to the increased tensile ductility of the steel with comparatively low hydrogen concentration.

W. Beck; E.J. Jankowsky; W.H. Golding

1967-01-01T23:59:59.000Z

119

BAYESIAN UPDATING OF PROBABILISTIC TIME-DEPENDENT FATIGUE MODEL: APPLICATION TO JACKET FOUNDATIONS OF WIND TURBINES  

E-Print Network (OSTI)

OF WIND TURBINES Benjamin Rocher1,2 , Franck Schoefs1 , Marc François1 , Arnaud Salou2 1 LUNAM Université.rocher@univ-nantes.fr ABSTRACT Due to both wave and wind fluctuation, the metal foundations of offshore wind turbines are highly algorithm. KEYWORDS: Fatigue, Damage, Reliability, Bayesian updating. INTRODUCTION In offshore wind turbines

Boyer, Edmond

120

J Am Cerom Soc 73 [4]893-903 (1990) Cyclic Fatigue-Crack Propagation in  

E-Print Network (OSTI)

InternationalScience Center, Thousand Oaks, California 91360 The subcritical growth of fatigue cracks under variable-amplitude cyclic loading, crack-growth rates show transient accelera- tions following low overloads, again analogous to behavior commonly observed in ductile metals. Cyclic crack-growth rates

Ritchie, Robert

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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 wear-resistant coatings on the fatigue strength of 4340 steel  

SciTech Connect

For applications using 4340 steel where hardened surfaces are required in a marine environment, surface coatings are necessary. Coatings that resist corrosion and provide wear resistance generally degrade the fatigue performance of the substrate metal. Shot peening before plating was ineffective in preventing a loss of fatigue life of plated steel bars compared to bare steel test bars which were not shot peened. The maximum residual compressive strength produced by shot peening was measured and was less than the maximum applied tensile stress in fatigue. As-plated electroless nickel has poor sliding wear resistance compared to either electroplated nickel or chromium in sliding wear at a contact stress of 37 Mpa. The tensile strength decreased in proportion to the volume fraction of coating applied to the steel substrate.

Duffy, E.R. [Naval Aviation Depot North Island, San Diego, CA (United States)

1998-12-31T23:59:59.000Z

122

On the Fatigue Analysis of Wind Turbines  

SciTech Connect

Modern wind turbines are fatigue critical machines that are typically used to produce electrical power from the wind. Operational experiences with these large rotating machines indicated that their components (primarily blades and blade joints) were failing at unexpectedly high rates, which led the wind turbine community to develop fatigue analysis capabilities for wind turbines. Our ability to analyze the fatigue behavior of wind turbine components has matured to the point that the prediction of service lifetime is becoming an essential part of the design process. In this review paper, I summarize the technology and describe the ''best practices'' for the fatigue analysis of a wind turbine component. The paper focuses on U.S. technology, but cites European references that provide important insights into the fatigue analysis of wind turbines.

Sutherland, Herbert J.

1999-06-01T23:59:59.000Z

123

Acoustic Emission Detection and Prediction of Fatigue Crack Propagation in Composite Patch Repairs Using Neural Networks  

SciTech Connect

An aircraft is subjected to severe structural and aerodynamic loads during its service life. These loads can cause damage or weakening of the structure especially for aging military and civilian aircraft, thereby affecting its load carrying capabilities. Hence composite patch repairs are increasingly used to repair damaged aircraft metallic structures to restore its structural efficiency. This paper presents the results of Acoustic Emission (AE) monitoring of crack propagation in 2024-T3 Clad aluminum panels repaired with adhesively bonded octagonal, single sided boron/epoxy composite patch under tension-tension fatigue loading. Crack propagation gages were used to monitor crack initiation. The identified AE sensor features were used to train neural networks for predicting crack length. The results show that AE events are correlated with crack propagation. AE system was able to detect crack propagation even at high noise condition of 10 Hz loading; that crack propagation signals can be differentiated from matrix cracking signals that take place due to fiber breakage in the composite patch. Three back-propagation cascade feed forward networks were trained to predict crack length based on the number of fatigue cycles, AE event number, and both the Fatigue Cycles and AE events, as inputs respectively. Network using both fatigue cycles and AE event number as inputs to predict crack length gave the best results, followed by Network with fatigue cycles as input, while network with just AE events as input had a greater error.

Okafor, A. Chukwujekwu; Singh, Navdeep; Singh, Navrag [Structural Health Monitoring and NDE Laboratory, Department of Mechanical and Aerospace Engineering, University of Missouri-Rolla, 1870 Miner Circle Rolla MO 65409-0050 (United States)

2007-03-21T23:59:59.000Z

124

Surface Plasmon mediated near-field imaging and optical addressing in nanoscience  

E-Print Network (OSTI)

We present an overview of recent progress in plasmonics. We focus our study on the observation and excitation of surface plasmon polaritons (SPPs) with optical near-field microscopy. We discuss in particular recent applications of photon scanning tunnelling microscope (PSTM) for imaging of SPP propagating in metal and dielectric wave guides. We show how near-field scanning optical microscopy (NSOM) can be used to optically and actively address remotely nano-objects such as quantum dots. Additionally we compare results obtained with near-field microscopy to those obtained with other optical far-field methods of analysis such as leakage radiation microscopy (LRM).

Drezet, A; Krenn, J R; Brun, M; Huant, S

2007-01-01T23:59:59.000Z

125

Accelerating Fatigue Testing for Cu Ribbon Interconnects (Presentation)  

SciTech Connect

This presentation describes fatigue experiments and discusses dynamic mechanical loading for Cu ribbon interconnects.

Bosco, N.; Silverman, T.; Wohlgemuth , J.; Kurtz, S.; Inoue, M.; Sakurai, K.; Shioda, T.; Zenkoh, H.; Miyashita, M.; Tadanori, T.; Suzuki, S.

2013-05-01T23:59:59.000Z

126

Probabilistic fatigue methodology and wind turbine reliability  

SciTech Connect

Wind turbines subjected to highly irregular loadings due to wind, gravity, and gyroscopic effects are especially vulnerable to fatigue damage. The objective of this study is to develop and illustrate methods for the probabilistic analysis and design of fatigue-sensitive wind turbine components. A computer program (CYCLES) that estimates fatigue reliability of structural and mechanical components has been developed. A FORM/SORM analysis is used to compute failure probabilities and importance factors of the random variables. The limit state equation includes uncertainty in environmental loading, gross structural response, and local fatigue properties. Several techniques are shown to better study fatigue loads data. Common one-parameter models, such as the Rayleigh and exponential models are shown to produce dramatically different estimates of load distributions and fatigue damage. Improved fits may be achieved with the two-parameter Weibull model. High b values require better modeling of relatively large stress ranges; this is effectively done by matching at least two moments (Weibull) and better by matching still higher moments. For this purpose, a new, four-moment {open_quotes}generalized Weibull{close_quotes} model is introduced. Load and resistance factor design (LRFD) methodology for design against fatigue is proposed and demonstrated using data from two horizontal-axis wind turbines. To estimate fatigue damage, wind turbine blade loads have been represented by their first three statistical moments across a range of wind conditions. Based on the moments {mu}{sub 1}{hor_ellipsis}{mu}{sub 3}, new {open_quotes}quadratic Weibull{close_quotes} load distribution models are introduced. The fatigue reliability is found to be notably affected by the choice of load distribution model.

Lange, C.H. [Stanford Univ., CA (United States)

1996-05-01T23:59:59.000Z

127

E-Print Network 3.0 - accelerated fatigue testing Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

FATIGUE DESIGN METHODS Summary: , caused either by processing or by fatigue, and uses fracture mechanics analyses and tests to check... 2-Fatigue Design Methods 14 ANALYSIS AND...

128

Contact fatigue : life prediction and palliatives  

E-Print Network (OSTI)

Fretting fatigue is defined as damage resulting from small magnitude (0.5-50 microns) displacement between contacting bodies where at least one of the bodies has an applied bulk stress. The applicability and limits of a ...

Conner, Brett P. (Brett Page), 1975-

2002-01-01T23:59:59.000Z

129

Rolling contact fatigue in martensitic 100Cr6: Subsurface hardening and crack formation  

E-Print Network (OSTI)

, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS bDepartment of Lubrication and Metallic Materials, SKF Engineering and Research Centre, Kelvinbaan 16, 3439 MT Nieuwegein, The Netherlands. Abstract Rolling contact fatigue tests on 100Cr6... ground to the deformed region. The unaffected area was cut into a thin plate with a rectangular section. The sectioned parts were cold- mounted, mechanically ground with silicon carbide papers, polished with 6 m, 1 m diamond suspensions, and final...

Kang, Jee-Hyun; Vegter, R. H.; Rivera-Daz-del-Castillo, Pedro E. J.

2014-04-13T23:59:59.000Z

130

CREEP AND CREEP-FATIGUE OF ALLOY 617 WELDMENTS  

SciTech Connect

The Very High Temperature Reactor (VHTR) Intermediate Heat Exchanger (IHX) may be joined to piping or other components by welding. Creep-fatigue deformation is expected to be a predominant failure mechanism of the IHX1 and thus weldments used in its fabrication will experience varying cyclic stresses interrupted by periods of elevated temperature deformation. These periods of elevated temperature deformation are greatly influenced by a materials creep behavior. The nickel-base solid solution strengthened alloy, Alloy 617, is the primary material candidate for a VHTR-type IHX, and it is expected that Alloy 617 filler metal will be used for welds. Alloy 617 is not yet been integrated into Section III of the Boiler and Pressure Vessel Code, however, nuclear component design with Alloy 617 requires ASME (American Society of Mechanical Engineers) Code qualification. The Code will dictate design for welded construction through significant performance reductions. Despite the similar compositions of the weldment and base material, significantly different microstructures and mechanical properties are inevitable. Experience of nickel alloy welds in structural applications suggests that most high temperature failures occur at the weldments or in the heat-affected zone. Reliably guarding against this type of failure is particularly challenging at high temperatures due to the variations in the inelastic response of the constituent parts of the weldment (i.e., weld metal, heat-affected zone, and base metal) [ref]. This work focuses on the creep-fatigue behavior of nickel-based weldments, a need noted during the development of the draft Alloy 617 ASME Code Case. An understanding of Alloy 617 weldments when subjected to this important deformation mode will enable determination of the appropriate design parameters associated with their use. Specifically, the three main areas emphasized are the performance reduction due to a weld discontinuity in terms of the reduced number of the cycles to failure and whether a saturation in reduced cycle life with increased hold times is observed, the microstructural stability over long cycle times, and finally, the location of the generated weldment data on a creep-fatigue damage diagram (D-diagram).

Wright, Jill; Carroll, Laura; Wright, Richard

2014-08-01T23:59:59.000Z

131

Actuation Fatigue of Shape Memory Alloys  

E-Print Network (OSTI)

). Schick (2009) conducted the rst study of the actuation fatigue of specimens produced from plate material at Texas A&M [34]. In this work, at-sheet fatigue specimens were machined from Ni60Ti40 (wt. %) plate using electro-discharge ma- chining (EDM... accuracy of strain measurements, and reduced cross-sectional area to accelerate cycling rates [36]. Specimens were produced using electro-discharge machining (EDM). All specimens were heat treated, polished and tested. 1. Specimen Geometry Flat...

Calhoun, Christopher

2012-07-16T23:59:59.000Z

132

Rolling Contact Fatigue of Ceramics  

SciTech Connect

High hardness, low coefficient of thermal expansion and high temperature capability are properties also suited to rolling element materials. Silicon nitride (Si{sub 3}N{sub 4}) has been found to have a good combination of properties suitable for these applications. However, much is still not known about rolling contact fatigue (RCF) behavior, which is fundamental information to assess the lifetime of the material. Additionally, there are several test techniques that are employed internationally whose measured RCF performances are often irreconcilable. Due to the lack of such information, some concern for the reliability of ceramic bearings still remains. This report surveys a variety of topics pertaining to RCF. Surface defects (cracks) in Si{sub 3}N{sub 4} and their propagation during RCF are discussed. Five methods to measure RCF are then briefly overviewed. Spalling, delamination, and rolling contact wear are discussed. Lastly, methods to destructively (e.g., C-sphere flexure strength testing) and non-destructively identify potential RCF-limiting flaws in Si{sub 3}N{sub 4} balls are described.

Wereszczak, Andrew A [ORNL; Wang, W. [Bournemouth University, Bournemouth, United Kingdom; Wang, Y. [Bournemouth University, Bournemouth, United Kingdom; Hadfield, M. [Bournemouth University, Bournemouth, United Kingdom; Kanematsu, W. [National Institute of Advanced Industrial Science and Technology, Japan; Kirkland, Timothy Philip [ORNL; Jadaan, Osama M. [University of Wisconsin, Platteville

2006-09-01T23:59:59.000Z

133

Fatigue Enhancement of Undersized, Drilled Crack-Arrest Holes  

E-Print Network (OSTI)

Fatigue cracks occur in steel bridges from repeated loads. If allowed to continue to grow, eventually the fatigue cracks will require either expensive repairs or reduction of traffic loads on the bridge, or they may lead ...

Simmons, Gary Gene

2013-12-31T23:59:59.000Z

134

Characterization of Fatigue Cracking and Healing of Asphalt Mixtures  

E-Print Network (OSTI)

Fatigue cracking is one of the most common distresses of asphalt pavements, whereas healing is a counter process to cracking which alleviates cracking damage and extends fatigue life of asphalt pavements. Most of existing methods to characterize...

Luo, Xue

2012-07-16T23:59:59.000Z

135

Fatigue behavior of alpha-zirconium phosphate/epoxy nanocomposites  

E-Print Network (OSTI)

Fatigue crack growth in -Zirconium phosphate/epoxy nanocomposites was investigated. A new fatigue testing technique was implemented for miniature samples. Two different methods ?strength of materials and Rayleigh-Ritz - were used in determining...

Varadharajan, Balaji R.

2006-04-12T23:59:59.000Z

136

Photo-Electric Thresholds and Fatigue  

Science Journals Connector (OSTI)

Photo-electric fatigue.Using elements of the highest purity, clean surfaces were prepared, in a vacuum of the order of 10-6 mm of Hg, by means of an electromagnetic filing device. A linear relation was found between the logarithm of the photo-electric current and the logarithm of the time elapsed since polishing the specimen. The rate of fatigue depends upon the element used and the factors which produce fatigue and, for a given substance, increases numerically as the threshold is approached. Increasing the pressure increases the rate of fatigue. The action of light has a negligible effect.Photo-electric thresholds.The values for Ca, Fe, Co, Ni, Cu, Zn, and Ge are, respectively, 4475, 3155, 3165, 3040, 2955, 3180, and 2880A. Within a period of several hours at least photo-electric fatigue causes no change in these values when a high vacuum is used. Evidence for a shift towards shorter wave-lengths is obtained for lower vacua.The "patch" theory.A theory in which contamination takes place at discrete areas of the surface of the element is proposed to account for the experimental facts obtained.

George B. Welch

1928-10-01T23:59:59.000Z

137

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

E-Print Network (OSTI)

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

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

2003-01-01T23:59:59.000Z

138

Associations between infections and fatigue in a Dutch working population: Results of the Maastricht Cohort Study on Fatigue at Work  

Science Journals Connector (OSTI)

The relationship between fatigue and common infections was further explored, as part of a 3 year prospective cohort study on Fatigue at Work. The current study is based on seven successive questionnaires, cove...

D.C.L. Mohren; G.M.H. Swaen; I.J. Kant; P.J.A. Borm

2001-01-01T23:59:59.000Z

139

Corrosion-fatigue crack growth behavior of surface crack on AH36 TMCP steel weld in seawater  

SciTech Connect

Fatigue crack growth behavior in seawater of surface crack on the weld was studied with a structural steel, AH36, manufactured by the thermo-mechanical control process (TMCP). Crack growth rate was measured for the surface cracks located in different regions of weld, such as the heat affected zone, the weld metal and the base metal. Influence of the welding condition was investigated with the variation of heat inputs of 80, 120 and 180 kJ/cm. Electrochemical analysis of each region of the weld was also performed to investigate the corrosion behavior between the weld and the base metal.

Kweon, Y.G.; Jeong, H.D.; Chang, R.W. [Research Inst. of Industrial Science and Technology, Pohang (Korea, Republic of). Welding Research Center

1995-12-31T23:59:59.000Z

140

Research on hydrogen environment fatigue test system and correlative fatigue test of hydrogen storage vessel  

Science Journals Connector (OSTI)

A 70MPa hydrogen environment fatigue test system has been designed and applied in the manufacture of a hydrogen storage vessel. Key equipment is the 80MPa flat steel ribbon wound high pressure hydrogen storage ve...

Rong Li ? ?; Chuan-xiang Zheng ???

2014-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Quantifying the Thermal Fatigue of CPV Modules  

SciTech Connect

A method is presented to quantify thermal fatigue in the CPV die-attach from meteorological data. A comparative; study between cities demonstrates a significant difference in the accumulated damage. These differences are most; sensitive to the number of larger (?T) thermal cycles experienced for a location. High frequency data (<1/min) may; be required to most accurately employ this method.

Bosco, N.; Kurtz, S.

2011-02-01T23:59:59.000Z

142

PREDICTORS OF POST-STROKE FATIGUE  

E-Print Network (OSTI)

PURPOSE: Fatigue is a commonly neglected issue despite the high incidence rate reported in people with chronic stroke. It can impact daily functions and quality of life and has been linked with a higher mortality rate after stroke because of its...

Tseng, Benjamin Yichen

2009-01-29T23:59:59.000Z

143

Damage and fatigue Continuum damage mechanics modeling  

E-Print Network (OSTI)

-CL?S : endommagement, fatigue, métaux, béton, élastomères, roche REGC ­ 10/2006. Geomechanics in energy production, pages 849 to 877 #12;850 REGC ­ 10/2006. Geomechanics in energy production 1. Introduction Continuum

144

Study of the Fatigue Life of Steel Catenary Risers in Interaction with the Seabed  

E-Print Network (OSTI)

1.1. Examples of riser configurations (DNV-OS-F201) .......................... 2 Figure 1.2. Sample of S-N curve (from DNV-RP-C203) .................................... 6 Figure 1.3. Schematic of flex joint (API RP 2RD... of the riser where it is attached to the vessel, and the TDZ where it contacts the seabed. Several methods are employed in order to reduce the fatigue damage in risers. Using flex joints ?which consist of one or more metal-elastomer bearings ? may reduce...

Nakhaee, Ali

2011-02-22T23:59:59.000Z

145

Use of CFRP Overlays to Repair Fatigue Damage in Steel Bridge Girders and Components  

E-Print Network (OSTI)

Fatigue damage in steel girder bridges built prior to the mid-1980s is common due to distortion-induced fatigue. Different repair techniques have been developed and implemented to retrofit bridges of this era with existing fatigue damage...

Gangel, Regan Elisabeth

2012-05-31T23:59:59.000Z

146

Difference between High- and Low-Stress Fatigue  

Science Journals Connector (OSTI)

... below the fatigue limit. Crack initiation may thus be considered as a consequence of surface roughening within broad slip bands7'8.

N. E. FROST

1961-11-04T23:59:59.000Z

147

Residual Stresses for Structural Analysis and Fatigue Life Prediction...  

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

Analysis and Fatigue Life Prediction in Vehicle Components: Success stories from the High Temperature Materials Laboratory (HTML) User Program Residual Stresses for Structural...

148

Stabilization of Electrocatalytic Metal Nanoparticles at Metal...  

NLE Websites -- All DOE Office Websites (Extended Search)

Electrocatalytic Metal Nanoparticles at Metal-Metal Oxide-Graphene Triple Junction Points. Stabilization of Electrocatalytic Metal Nanoparticles at Metal-Metal Oxide-Graphene...

149

Stress-corrosion fatiguecrack growth in a Zr-based bulk amorphous metal  

E-Print Network (OSTI)

of the work was to determine the rate and mechanisms of subcritical crack growth in this metallic glassStress-corrosion fatigue­crack growth in a Zr-based bulk amorphous metal V. Schroeder 1 , R. Results indicate that crack growth in aqueous solution in this alloy is driven by a stress-assisted anodic

Ritchie, Robert

150

E-Print Network 3.0 - actual fatigue usage Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

2007 Published online 18 June 2007 Keywords: Bone Dentin Fatigue Mineralized tissues Fracture Life... in the fatigue and fracture of mineralized tissues, and to discover how these...

151

Predicting overload-affected fatigue crack growth in steels  

SciTech Connect

The ability of semi-empirical crack closure models to predict the effect of overloads on fatigue crack growth in low-alloy steels has been investigated. With this purpose, the CORPUS model developed for aircraft metals and spectra has been checked first through comparisons between the simulated and observed results for a low-alloy steel. The CORPUS predictions of crack growth under several types of simple load histories containing overloads appeared generally unconservative which prompted the authors to formulate a new model, more suitable for steels. With the latter approach, the assumed evolution of the crack opening stress during the delayed retardation stage has been based on experimental results reported for various steels. For all the load sequences considered, the predictions from the proposed model appeared to be by far more accurate than those from CORPUS. Based on the analysis results, the capability of semi-empirical prediction concepts to cover experimentally observed trends that have been reported for sequences with overloads is discussed. Finally, possibilities of improving the model performance are considered.

Skorupa, M.; Skorupa, A.; Ladecki, B. [Univ. of Mining and Metallurgy, Krakow (Poland). Dept. of Mechanical Engineering and Robotics

1996-12-01T23:59:59.000Z

152

Estimating Fatigue Curves With the Random FatigueLimit Francis G. Pascual  

E-Print Network (OSTI)

the stress below which an infinite or a specified large number of cycles can be sustained, whichever case, and composite materials and ap­ plied stress is an important input to design­for­reliability processes. This article suggests a practical model to describe the relationship between fatigue life and applied stress

153

Estimating Fatigue Curves With the Random Fatigue-Limit Francis G. Pascual  

E-Print Network (OSTI)

stress is an important input to design-for-reliability processes. This article suggests a practical model large number of cycles can be sustained, whichever case is appropriate. The existence of in nite materials, it is common practice to de ne the \\fatigue strength" to be the stress level below which failure

154

Collect Available Creep-Fatigue Data and Study Existing Creep-Fatigue Evaluation Procedures for Grade 91 and Hastelloy XR  

SciTech Connect

This report describes the results of investigation on Task 5 of DOE/ASME Materials Project based on a contract between ASME Standards Technology, LLC (ASME ST-LLC) and Japan Atomic Energy Agency (JAEA). Task 5 is to collect available creep-fatigue data and study existing creep-fatigue evaluation procedures for Grade 91 steel and Hastelloy XR. Part I of this report is devoted to Grade 91 steel. Existing creep-fatigue data were collected (Appendix A) and analyzed from the viewpoints of establishing a creep-fatigue procedure for VHTR design. A fair amount of creep-fatigue data has been obtained and creep-fatigue phenomena have been clarified to develop design standards mainly for fast breeder reactors. Following this, existing creep-fatigue procedures were studied and it was clarified that the creep-fatigue evaluation procedure of the ASME-NH has a lot of conservatisms and they were analyzed in detail from the viewpoints of the evaluation of creep damage of material. Based on the above studies, suggestions to improve the ASME-NH procedure along with necessary research and development items were presented. Part II of this report is devoted to Hastelloy XR. Existing creep-fatigue data used for development of the high temperature structural design guideline for High Temperature Gas-cooled Reactor (HTGR) were collected. Creep-fatigue evaluation procedure in the design guideline and its application to design of the intermediate heat exchanger (IHX) for High Temperature Engineering Test Reactor (HTTR) was described. Finally, some necessary research and development items in relation to creep-fatigue evaluation for Gen IV and VHTR reactors were presented.

Tai Asayama; Yukio Tachibana

2007-09-30T23:59:59.000Z

155

Ris0-R-991(EN) Fatigue Performance of Copper and  

E-Print Network (OSTI)

Ris0-R-991(EN) inn DK9700117 Fatigue Performance of Copper and Copper alloys before and after ARE MISSING IN THE ORIGINAL DOCUMENT #12;Fatigue Performance of Copper and Copper alloys before and after performance of pure copper of the oxygen free, high conductivity (OFHC) grade and two copper alloys (Cu

156

Fracture toughness and fatigue crack growth characteristics of nanotwinned copper  

E-Print Network (OSTI)

fracture and subcritical fatigue crack growth life. Possible mechanistic origins of these trends and the resistance to stable subcritical crack growth under mono- tonic and cyclic loading, especially at lowerFracture toughness and fatigue crack growth characteristics of nanotwinned copper A. Singh a,1 , L

Suresh, Subra

157

Metal Aminoboranes  

NLE Websites -- All DOE Office Websites (Extended Search)

Metal Aminoboranes Metal Aminoboranes Metal Aminoboranes Metal aminoboranes of the formula M(NH.sub.2BH.sub.3).sub.n have been synthesized. June 25, 2013 Metal Aminoboranes Metal aminoboranes of the formula M(NH.sub.2BH.sub.3).sub.n have been synthesized. Available for thumbnail of Feynman Center (505) 665-9090 Email Metal Aminoboranes Metal aminoboranes of the formula M(NH.sub.2BH.sub.3).sub.n have been synthesized. Metal aminoboranes are hydrogen storage materials. Metal aminoboranes are also precursors for synthesizing other metal aminoboranes. Metal aminoboranes can be dehydrogenated to form hydrogen and a reaction product. The reaction product can react with hydrogen to form a hydrogen storage material. Metal aminoboranes can be included in a kit. U.S. Patent No.: 7,713,506 (DOE S-112,798)

158

April 10, 2014- Workplace Disruptions, Reorganizations, and Change Fatigue: Can ADR Support Resilience?  

Energy.gov (U.S. Department of Energy (DOE))

April 10, 2014 - Workplace Disruptions, Reorganizations, and Change Fatigue: Can ADR Support Resilience?

159

COG fitness for service fatigue program  

SciTech Connect

As the population of nuclear power plants ages, new defects are appearing in Steam Generators (SG) subjected to particularly sever operational stresses, among them pitting, support plate denting, stress corrosion cracking, fatigue induced cracking, and fretting. Utilities are requiring additional data to characterize defects after their detection, i.e., their depth, length and orientation, in order to optimize any tube plugging decision. In this paper, progress report on CANDU development of FFSG (fitness for service) requirements are provided. Currently, the FFSG program has launched projects into three main fields; viz. specimen testing simulating CANDU SG environment especially regarding fatigue crack initiation, propagation and stress corrosion cracking of I-600, I-800 and M-400 alloys, data compilation and evaluations, criteria document preparation for SG tubing degradation evaluations based on deterministic and probabilistic risk assessment methods. The paper as well discusses the database that is currently being prepared for the PVRC. In the PVRC database information is collected from different worldwide sources in Japan Europe, the US and Canada.

Kharshafdjian, G. [AECL, Ontario (Canada)

1996-12-01T23:59:59.000Z

160

J-integral values for cracks in conventional fatigue specimens  

SciTech Connect

Comprehensive S-N fatigue data has been developed worldwide using conventional low-cycle fatigue tests. Such tests use smooth unnotched specimens subjected to controlled axial deflection or strain ranges. The tests must be run in the plastic regime in order to achieve the required cycles-to-failure. Recent developments have highlighted the need to understand and interpret the significance of the resulting strain range vs. cycles to failure data in terms of crack initiation and propagation. Since conventional fatigue tests are conducted in the plastic regime, linear elastic fracture mechanics cannot be used to accurately quantify crack growth in such tests. Elastic-plastic J-integral theory, however, has been shown to provide excellent correlations of crack growth in the elastic, elastic-plastic and grossly-plastic regimes for a wide range of geometric and loading conditions. The authors are applying this theory to the low-cycle fatigue specimen crack behavior. As cracks progress in conventional fatigue specimens, bending becomes significant. Since fatigue testing machines are quite stiff relative to the small fatigue specimens, the ends of the specimen are constrained to remain parallel, and this reduces bending in the cracked cross-section. Three-dimensional finite element elastic-plastic analyses are required to include these constraints in the J-integral solutions.

O`Donnell, T.P.; O`Donnell, W.J. [O`Donnell Consulting Engineers, Pittsburgh, PA (United States)

1996-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Thermomechanics of damage and fatigue by a phase field model  

E-Print Network (OSTI)

In the paper we present an isothermal model for describing damage and fatigue by the use of the Ginzburg-Landau (G-L) equation. Fatigue produces progressive damage, which is related with a variation of the internal structure of the material. The G-L equation studies the evolution of the order parameter, which describes the constitutive arrangement of the system and, in this framework, the evolution of damage. The thermodynamic coherence of the model is proved. In the last part of the work, we extend the results of the paper to a non-isothermal system, where fatigue contains thermal effects, which increase the damage of materials.

Giovambattista Amendola; Mauro Fabrizio

2014-10-26T23:59:59.000Z

162

High cycle fatigue properties of aluminium foams  

SciTech Connect

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

163

Micromechanisms of short fatigue crack growth in an Al-Si piston alloy. T.O. Mbuya1  

E-Print Network (OSTI)

1 Micromechanisms of short fatigue crack growth in an Al-Si piston alloy. T.O. Mbuya1 , and P behaviour of a model cast aluminium piston alloy has been investigated. This has been achieved using. Keywords: Fatigue; Short fatigue cracks; Fatigue micromechanics; Al-Si ; Fatigue ; piston alloys 1

164

DOE/BES/NSET annual report on growth of metal and semiconductor nanostructures using localized photocatalysts.  

SciTech Connect

Our overall goal is to understand and develop a novel light-driven approach to the controlled growth of unique metal and semiconductor nanostructures and nanomaterials. In this photochemical process, bio-inspired porphyrin-based photocatalysts reduce metal salts in aqueous solutions at ambient temperatures to provide metal nucleation and growth centers. Photocatalyst molecules are pre-positioned at the nanoscale to control the location and morphology of the metal nanostructures grown. Self-assembly, chemical confinement, and molecular templating are some of the methods used for nanoscale positioning of the photocatalyst molecules. When exposed to light, the photocatalyst molecule repeatedly reduces metal ions from solution, leading to deposition and the synthesis of the new nanostructures and nanostructured materials. Studies of the photocatalytic growth process and the resulting nanostructures address a number of fundamental biological, chemical, and environmental issues and draw on the combined nanoscience characterization and multi-scale simulation capabilities of the new DOE Center for Integrated Nanotechnologies, the University of New Mexico, and Sandia National Laboratories. Our main goals are to elucidate the processes involved in the photocatalytic growth of metal nanomaterials and provide the scientific basis for controlled synthesis. The nanomaterials resulting from these studies have applications in nanoelectronics, photonics, sensors, catalysis, and micromechanical systems. The proposed nanoscience concentrates on three thematic research areas: (1) the creation of nanoscale structures for realizing novel phenomena and quantum control, (2) understanding nanoscale processes in the environment, and (3) the development and use of multi-scale, multi-phenomena theory and simulation. Our goals for FY03 have been to understand the role of photocatalysis in the synthesis of dendritic platinum nanostructures grown from aqueous surfactant solutions under ambient conditions. The research is expected to lead to highly nanoengineered materials for catalysis mediated by platinum, palladium, and potentially other catalytically important metals. The nanostructures made also have potential applications in nanoelectronics, nanophotonics, and nanomagnetic systems. We also expect to develop a fundamental understanding of the uses and limitations of biomimetic photocatalysis as a means of producing metal and semiconductor nanostructures and nanomaterials. The work has already led to a relationship with InfraSUR LLC, a small business that is developing our photocatalytic metal reduction processes for environmental remediation. This work also contributes to science education at a predominantly Hispanic and Native American university.

Haddad, Raid Edward; Brinker, C. Jeffrey; Shelnutt, John Allen; Yang, Yi; Nuttall, H. Eric; Watt, Richard K.; Singl, Anup K.; Challa, Sivakumar R.; Wang, Zhongchun; van Swol, Frank B.; Pereira, Eulalia; Qiu, Yan; Jiang, Ying-Bing; Xu, Huifang; Medforth, Craig J.; Song, Yujiang

2003-10-01T23:59:59.000Z

165

Data Treatment and Generation of Fatigue Load Spectrum  

Science Journals Connector (OSTI)

Fatigue reliability assessment is becoming increasingly pertinent in designing mechanical structures and components. For this, it is necessary to identify the probability density function (p.d.f.) defining the sc...

J. J. Xiong; R. A. Shenoi

2011-01-01T23:59:59.000Z

166

Fatigue behaviour of nanoclay reinforced epoxy resin composites  

Science Journals Connector (OSTI)

Abstract Nanoparticle filling is a feasible way to increase the mechanical properties of polymer matrices. Abundant research work has been published in the last number of years concerning the enhancement of the mechanical properties of nanoparticle filled polymers, but only a reduced number of studies have been done focusing on the fatigue behaviour. This work analyses the influence of nanoclay reinforcement and water presence on the fatigue behaviour of epoxy matrices. The nanoparticles were dispersed into the epoxy resin using a direct mixing method. The dispersion and exfoliation of nanoparticles was characterised by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Fatigue strength decreased with the nanoclay incorporation into the matrix. Fatigue life of nanoclay filled composites was significantly reduced by the notch effect and by the immersion in water.

J.A.M. Ferreira; L.P. Borrego; J.D.M. Costa; C. Capela

2013-01-01T23:59:59.000Z

167

Fatigue Enhancement of a Carbon Fiber Reinforced Nanocomposite  

E-Print Network (OSTI)

The primary objective of the present investigation is to study the fatigue characteristics of a woven carbon fiber reinforced polymer which has been modified with either amine or fluorine functionalized carbon nanotubes on the fiber-matrix interface...

Wilkerson, Justin W.

2008-08-19T23:59:59.000Z

168

Fatigue Loads Estimation Through a Simple Stochastic Model  

E-Print Network (OSTI)

We propose a procedure to estimate the fatigue loads on wind turbines, based in a recent framework used for reconstructing data series of stochastic properties measured at wind turbines. Through a standard fatigue analysis, we show that it is possible to accurately estimate fatigue loads in any wind turbine within one wind park, using only the load measurements at one single turbine and the set of wind speed measurements. Our framework consists of deriving a stochastic differential equation that describes the evolution of the torque at one wind turbine driven by the wind speed. The stochastic equation is derived directly from the measurements and is afterwards used for predicting the fatigue loads at neighboring turbines. Such a framework could be used to mitigate the financial efforts usually necessary for placing measurement devices in all wind turbines within one wind farm. Finally, we also discuss the limitations and possible improvements of the proposed procedure.

Lind, Pedro G; Peinke, Joachim

2014-01-01T23:59:59.000Z

169

Fatigue tests of under-strenghth timber railroad bridge stringers  

E-Print Network (OSTI)

OF SCIENCE December 2002 Major Subject: Civil Engineering FATIGUE TESTS OF UNDER-STRENGTH TIMBER RAILROAD BRIDGE STRINGERS A Thesis by CHRISTOPHER RYAN BORCHERS Submitted to Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE Approved as to style and content by: G T. Fry (Chair of Committee) iedz cki of Departme Anne M. Raich (Member) rry L. Kohutek (Member) December 2002 Major Subject: Civil Engineering ABSTRACT Fatigue Tests of Under...

Borchers, Christopher Ryan

2002-01-01T23:59:59.000Z

170

Statistical simulation of small fatigue crack nucleation and coalescence in a lamellar TiAl alloy  

SciTech Connect

This article examines the possibility of fatigue failure as the result of fatigue crack nucleation and coalescence at stress ranges below the fatigue limit and the large crack threshold where fatigue cracks are expected not to grow. By representing the material as a two-dimensional array of beam elements, the nucleation of nonpropagating small cracks at various material locations is modeled via a statistical approach that considers fatigue crack nucleation by accumulation of damage at randomly distributed weak regions. Once nucleated, the fatigue cracks do not propagate but extend only by linking with fatigue cracks subsequently formed in the contiguous elements. Result of the computer simulation suggests that fatigue failure by crack nucleation and coalescence is feasible, but the cycles-to-coalescence is much longer than the cycles-to-initiation for the first crack. Implications of the results in fatigue life assessment based on the Kitagawa diagram are discussed for TiAl alloys.

Chan, K.S. [Southwest Research Inst., San Antonio, TX (United States); Wittowsky, B. [Proctor and Gamble European Service GmbH, Euskirchen (Germany); Pfuff, M. [GKSS Research Center, Geesthacht (Germany)

1999-05-01T23:59:59.000Z

171

Comparison of fatigue analysis approaches for predicting fatigue lives of hot-mix asphalt concrete (HMAC) mixtures  

E-Print Network (OSTI)

) and without (CM) surface energy measurements, and the proposed NCHRP 1-37A 2002 Pavement Design Guide (MEPDG) were comparatively evaluated and utilized to characterize the fatigue resistance of two Texas HMAC mixtures in the laboratory, including...

Walubita, Lubinda F.

2006-08-16T23:59:59.000Z

172

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

SciTech Connect

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

Shen, Chen

2014-01-20T23:59:59.000Z

173

Metal inks  

DOE Patents (OSTI)

Self-reducing metal inks and systems and methods for producing and using the same are disclosed. In an exemplary embodiment, a method may comprise selecting metal-organic (MO) precursor, selecting a reducing agent, and dissolving the MO precursor and the reducing agent in an organic solvent to produce a metal ink that remains in a liquid phase at room temperature. Metal inks, including self-reducing and fire-through metal inks, are also disclosed, as are various applications of the metal inks.

Ginley, David S; Curtis, Calvin J; Miedaner, Alex; van Hest, Marinus Franciscus Antonius Maria; Kaydanova, Tatiana

2014-02-04T23:59:59.000Z

174

Metal Oxides  

Science Journals Connector (OSTI)

Metal oxides are the class of materials having the widest application in gas sensors. This chapter presents information related to the application of various metal oxides in gas sensors designed on different p...

Ghenadii Korotcenkov

2013-01-01T23:59:59.000Z

175

Silicone metalization  

DOE Patents (OSTI)

A system for providing metal features on silicone comprising providing a silicone layer on a matrix and providing a metal layer on the silicone layer. An electronic apparatus can be produced by the system. The electronic apparatus comprises a silicone body and metal features on the silicone body that provide an electronic device.

Maghribi, Mariam N. (Livermore, CA); Krulevitch, Peter (Pleasanton, CA); Hamilton, Julie (Tracy, CA)

2006-12-05T23:59:59.000Z

176

Optimal inspection scheduling with alternative fatigue reliability formulations for steel bridges  

E-Print Network (OSTI)

Optimal inspection scheduling with alternative fatigue reliability formulations for steel bridges H, USA Keywords: steel bridges, structural reliability, fatigue, optimal inspection, fracture, plate girder, box girder ABSTRACT: A reliability-based method for inspection scheduling of steel bridges

Manuel, Lance

177

The cognitive performance of patients with multiple sclerosis during periods of high and low fatigue.  

E-Print Network (OSTI)

The objective of this study was to examine whether multiple sclerosis (MS)-related fatigue affects patients' cognitive performance. Thirty patients who had substantial fatigue in conjunction with MS and who reported marked ...

Parmenter, Brett A.; Denney, Douglas R.; Lynch, Sharon G.

2003-03-01T23:59:59.000Z

178

E-Print Network 3.0 - abdominal muscle fatigue Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

(2008) doi:10.1016j.gaitpost.2008.03.005 MUSCLE FATIGUE DEGRADES FORCE SENSE AT THE ANKLE JOINT Summary: of muscle fatigue on force sense at the ankle joint, ten young healthy...

179

Effect of whipping stresses on the fatigue damage of ship structures  

Science Journals Connector (OSTI)

Fatigue failures in ships are mainly caused by waves. Higher frequent ... if this approach and the neglect of sequence effects of stress cycles are justified for these ... of the whipping stresses in fatigue anal...

Wolfgang Fricke; Hans Paetzold

2014-03-01T23:59:59.000Z

180

Fatigue damage behaviors of carbon fiber-reinforced epoxy composites containing nanoclay  

Science Journals Connector (OSTI)

The effects of nanoclay inclusion on cyclic fatigue behavior and residual properties of carbon fiber-reinforced composites (CFRPs) after fatigue have been studied. The tensiontension cyclic fatigue tests are conducted at various load levels to establish the S-N curve. The residual strength and modulus are measured at different stages of fatigue cycles. The scanning electron microscopy (SEM) and scanning acoustic microscopy (SAM) are employed to characterize the underlying fatigue damage mechanisms and progressive damage growth. The incorporation of nanoclay into CFRP composites not only improves the mechanical properties of the composite in static loading, but also the fatigue life for a given cyclic load level and the residual mechanical properties after a given period of cyclic fatigue. The corresponding fatigue damage area is significantly reduced due to nanoclay. Nanoclay serves to suppress and delay delamination damage growth and eventual failure by improving the fiber/matrix interfacial bond and through the formation of nanoclay-induced dimples.

Shafi Ullah Khan; Arshad Munir; Rizwan Hussain; Jang-Kyo Kim

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

USE OF COMPOSITE MATERIALS TO REPAIR STEEL STRUCTURES VULNERABLE TO FATIGUE DAMAGE  

E-Print Network (OSTI)

This study investigates mainly two different topics related to the use of CFRP's for strengthening and repair of steel bridges: the use of CFRP's to prevent damage in fatigue vulnerable welded connections prior to fatigue-crack initiation...

Alemdar, Fatih

2010-01-01T23:59:59.000Z

182

The effects of asphalt binder oxidation on hot mix asphalt concrete mixture rheology and fatigue performance  

E-Print Network (OSTI)

. The decline in mixture fatigue life (determined using the calibrated mechanistic fatigue analysis approach with surface energy measurement) due to oxidation is significant. Pavement service life is dependent on the mixture, but can be estimated by a cumulative...

Jung, Sung Hoon

2009-06-02T23:59:59.000Z

183

JOURNAL OF NANOSCIENCE LETTERS J. Nanosci. Lett. 2012, 2: 1  

E-Print Network (OSTI)

building blocks, especially at the nanometer scale [5-9]. Environmental pollution and the need for environmental and energy applications Meidan Yea,b , Danny Vennerberga , Changjian Linb , Zhiqun Lina of renewable energy and environmental remediation. Of these, TiO2 stands out as one of the most investigated

Lin, Zhiqun

184

E-Print Network 3.0 - amplitude fatigue loading Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Smin Maximum... FATIGUE TESTS AND ... Source: Fatemi, Ali - Department of Mechanical, Industrial and Manufacturing Engineering, University of Toledo Collection: Materials...

185

Atmospheric and Wake Turbulence Impacts on Wind Turbine Fatigue Loadings  

SciTech Connect

Large-eddy simulations of atmospheric boundary layers under various stability and surface roughness conditions are performed to investigate the turbulence impact on wind turbines. In particular, the aeroelastic responses of the turbines are studied to characterize the fatigue loading of the turbulence present in the boundary layer and in the wake of the turbines. Two utility-scale 5-MW turbines that are separated by seven rotor diameters are placed in a 3 km by 3 km by 1 km domain. They are subjected to atmospheric turbulent boundary layer flow and data is collected on the structural response of the turbine components. The surface roughness was found to increase the fatigue loads while the atmospheric instability had a small influence. Furthermore, the downstream turbines yielded higher fatigue loads indicating that the turbulent wakes generated from the upstream turbines have significant impact.

Lee, S.; Churchfield, M.; Moriarty, P.; Jonkman, J.; Michalakes, J.

2012-01-01T23:59:59.000Z

186

Nanoscience Research Internships in Illinois  

SciTech Connect

NanoBusiness Talent Project Summary Report The NanoBusiness Alliance created the NanoBusiness Talent Program to ensure the future vitality of domestic scientists and entrepreneurs by engaging advanced high school students in cutting-edge nanotechnology development. This program commenced on September 1, 2008 and ran through August 31, 2010 with a very successful group of students. Several of these students went on to Stanford, Harvard and Yale, as well as many other prestigious Universities. We were able to procure the cooperation of several companies over the entire run of the program to voluntarily intern students at their companies and show them the possibilities that exist for their future. Companies ranged from NanoInk and Nanosphere to QuesTek and NanoIntegris all located in northern Illinois. During the 9-week internships, students worked at nanotechnology companies studying different ways in which nanotechnology is used for both commercial and consumer use. The students were both excited and invigorated at the prospect of being able to work with professional scientists in fields that previously may have just been a dream or an unreachable goal. All the students worked closely with mentors from each company to learn different aspects of procedures and scientific projects that they then used to present to faculty, parents, mentors and directors of the program at the end of each years program. The presentations were extremely well received and professionally created. We were able to see how much the students learned and absorbed through the course of their internships. During the last year of the program, we reached out to both North Carolina and Colorado high school students and received an extraordinary amount of applications. There were also numerous companies that were not only willing but excited at the prospect to engage highly intelligent high school students and to encourage them into the nanotechnology scientific field. Again, this program increase was highly received and the students were thoroughly engaged. Our program ended August 31, 2010 with our last class of students and their final presentations. From the pilot year to the end presentations, we received hundreds of applications from students excited for the opportunity to work in a scientific field. With our goal of inspiring the newest generation of potential scientists and mathematician, we not only found ourselves overwhelmingly impressed but encouraged that the greatest minds of the future will come from this next generation and many more generations.

Kronshage, Alisa [Executive Board

2013-08-31T23:59:59.000Z

187

Modeling Thermal Fatigue in CPV Cell Assemblies: Preprint  

SciTech Connect

A finite element model has been created to quantify the thermal fatigue damage of the CPV die attach. Simulations are used to compare to results of empirical thermal fatigue equations originally developed for accelerated chamber cycling. While the empirical equations show promise when extrapolated to the lower temperature cycles characteristic of weather-induced temperature changes in the CPV die attach, it is demonstrated that their damage does not accumulate linearly: the damage a particular cycle contributes depends on the preceding cycles. Simulations of modeled CPV cell temperature histories provided for direct comparison of the FEM and empirical methods, and for calculation of equivalent times provided by standard accelerated test sequences.

Bosco, N.; Silverman, T. J.; Kurtz, S.

2011-07-01T23:59:59.000Z

188

Understanding the fatigue resistance of gamma titanium aluminide  

SciTech Connect

The fatigue limit of Ti-48Al-2Cr in the as HIPed condition was found to be well above the tensile yield strength at room temperature, and was not significantly affected by frequency, microstructure, surface finish or load ratio. On the other hand, a circumferential notch was found to be damaging. The shape of the S-N curve was mostly horizontal, as long as deformation characteristics were not influenced by microstructure or test temperature, and the surface was smooth. While giving due considerations to the fatigue damage a probable problem area for practical applications is identified.

Vaidya, W.V.; Schwalbe, K.H.; Wagner, R. [GKSS Research Center, Geesthacht (Germany). Inst. for Materials Research

1995-12-31T23:59:59.000Z

189

AIAA-2001-0025 SPECTRUM FATIGUE LIFETIME AND RESIDUAL STRENGTH  

E-Print Network (OSTI)

fit of the two. Direct lifetime under a variety of loads spectra for wind tests of residual strength for a modified standard wind bone coupons were manufactured, tested and favorably turbine spectrum. When a single and residual strength. Over 900 tests spectrum loading and fatigue lifetimes of a typical wind have been run

190

Dependence of offshore wind turbine fatigue loads on atmospheric stratification  

Science Journals Connector (OSTI)

The stratification of the atmospheric boundary layer (ABL) is classified in terms of the M-O length and subsequently used to determine the relationship between ABL stability and the fatigue loads of a wind turbine located inside an offshore wind farm. Recorded equivalent fatigue loads, representing blade-bending and tower bottom bending, are combined with the operational statistics from the instrumented wind turbine as well as with meteorological statistics defining the inflow conditions. Only a part of all possible inflow conditions are covered through the approximately 8200 hours of combined measurements. The fatigue polar has been determined for an (almost) complete 360 inflow sector for both load sensors, representing mean wind speeds below and above rated wind speed, respectively, with the inflow conditions classified into three different stratification regimes: unstable, neutral and stable conditions. In general, impact of ABL stratification is clearly seen on wake affected inflow cases for both blade and tower fatigue loads. However, the character of this dependence varies significantly with the type of inflow conditions e.g. single wake inflow or multiple wake inflow.

K S Hansen; G C Larsen; S Ott

2014-01-01T23:59:59.000Z

191

PARAMETRIC MODELS FOR ESTIMATING WIND TURBINE FATIGUE LOADS FOR DESIGN  

E-Print Network (OSTI)

loads. #12;2 INTRODUCTION Design constraints for wind turbine structures fall into either extreme load1 PARAMETRIC MODELS FOR ESTIMATING WIND TURBINE FATIGUE LOADS FOR DESIGN Lance Manuel1 Paul S, TX 78712 2 Sandia National Laboratories, Wind Energy Technology Department, Albuquerque, NM 87185

Sweetman, Bert

192

Metal oxide films on metal  

DOE Patents (OSTI)

A structure including a thin film of a conductive alkaline earth metal oxide selected from the group consisting of strontium ruthenium trioxide, calcium ruthenium trioxide, barium ruthenium trioxide, lanthanum-strontium cobalt oxide or mixed alkaline earth ruthenium trioxides thereof upon a thin film of a noble metal such as platinum is provided.

Wu, Xin D. (Los Alamos, NM); Tiwari, Prabhat (Los Alamos, NM)

1995-01-01T23:59:59.000Z

193

Metal Toxicity  

Science Journals Connector (OSTI)

Problems posed to plants by metal toxicity in the soils of the world are basically of two kinds. The first kind are of natural origin. These arise either as a consequence of the nature of the parent material f...

T. McNeilly

1994-01-01T23:59:59.000Z

194

Dendritic metal nanostructures  

DOE Patents (OSTI)

Dendritic metal nanostructures made using a surfactant structure template, a metal salt, and electron donor species.

Shelnutt, John A. (Tijeras, NM); Song, Yujiang (Albuquerque, NM); Pereira, Eulalia F. (Vila Nova de Gaia, PT); Medforth, Craig J. (Winters, CA)

2010-08-31T23:59:59.000Z

195

Development of fatigue stress spectrum and fatigue life prediction of endless winder sheave for wind turbine lift using finite element analysis  

Science Journals Connector (OSTI)

This paper aims to develop the fatigue stress spectrum and predicted fatigue life of the endless winder sheave using finite element (FE) analysis which is utilized in wind turbine lift. First we identified the fatigue critical location (FCL) of endless winder sheave through a static FE analysis. And the lifting velocity was measured using the non-contact velocity dectector. Based on the measured lifting velocity and compressive loads by traction of endless winder sheave the compressive load-angle of rotation history at the FCL was determined. According to the compressive load-angle of rotation time history total 230 FE analyses were performed with the interval of the angle of rotation of 15 we eventually obtained the fatigue stress spectrum at the FCL. These results were processed using the rainflow cycle counting and the Goodman equation. Finally the fatigue life of sheave was evaluated using the linear damage cumulative rule.

2014-01-01T23:59:59.000Z

196

Evaluation of low-cycle fatigue crack growth and subsequent ductile fracture for cracked pipe experiments using cyclic J-integral  

SciTech Connect

Piping for LWR power plants is required to satisfy the Leak-Before-Break concept for postulated (not actual) defects. With this in mind, numerous research has so far been conducted on the fatigue crack growth under cyclic loading, and on the ductile crack growth under excessive loading. Study on cracked pipe fracture under cyclic loading gains much attention from the viewpoint of the Leak-Before-Break concept for seismic loading that accompanies large-scale yielding. An evaluation method based on cyclic J-integral was newly developed to predict the low-cycle fatigue crack growth and the subsequent ductile fracture for cyclic loading that accompanies large-scale yielding. Cyclic J-integral was introduced to describe the crack growth up to failure. The method was applied to 4-inch diameter circumferentially through-wall-cracked carbon steel base metal pipes and welded pipe joints subjected to cyclic 4-point bending at room temperature and high temperature of approximately 300 C. Fatigue crack growth behavior and failure life were successfully predicted by the proposed approach.

Miura, Naoki; Fujioka, Terutaka; Kashima, Koichi [CRIEPI, Tokyo (Japan); Miyazaki, Katsumasa; Kanno, Satoshi; Hayashi, Makoto; Ishiwata, Masayuki; Gotoh, Nobuho [Hitachi, Ltd., Ibaraki (Japan)

1996-12-01T23:59:59.000Z

197

Hydride-phase formation and its influence on fatigue crack propagationbehavior in a Zircaloy-4 alloy  

SciTech Connect

The hydride-phase formation and its influence on the fatigue behavior of a Zircaloy-4 alloy charged with hydrogen gas are investigated. First, the microstructure and fatigue crack propagation rate of the alloy in the as-received condition are studied. Second, the formation and homogeneous distribution of delta zirconium hydride ( -ZrH2) in the bulk, and its effect on the fatigue crack propagation rate are presented. The results show that in the presence of hydrides the zirconium alloy exhibits reduced toughness and enhanced crack growth rates. Finally, the influence of a pre-existing fatigue crack in the specimen and the subsequent hydride formation were investigated. The residual lattice strain profile around the fatigue crack tip was measured using neutron diffraction. The combined effects of residual strains and hydride precipitation on the fatigue behavior are discussed.

Garlea, Elena [University of Tennessee, Knoxville (UTK); Choo, H. [University of Tennessee, Knoxville (UTK); Wang, G Y [University of Tennessee, Knoxville (UTK); Liaw, Peter K [University of Tennessee, Knoxville (UTK); Clausen, B [Los Alamos National Laboratory (LANL); Brown, D. W. [Los Alamos National Laboratory (LANL); Park, Jae-Sung [University of Tennessee, Knoxville (UTK); Rack, P. D. [University of Tennessee, Knoxville (UTK); Kenik, Edward A [ORNL

2010-01-01T23:59:59.000Z

198

On the Fatigue Reliability of Hydroelectric Francis Runners  

Science Journals Connector (OSTI)

Abstract The reliability assessment of large rotating structures like hydroelectric Francis runners is often limited by our capacity to define a proper limit state combined with a relevant degradation model. In this paper, we propose that the proper limit state for fatigue reliability of such structures is the onset of high cycle fatigue (HCF). Based on this premise, a prior interval for our limit state based on available literature is presented. The prior assumptions are believed to be the first step toward validation of the applicability and suitability of the proposed model. The paper includes an overview of the theoretical background for reliability assessment of Francis turbine runners, the methodology used, and the results obtained from the information gathered from the available literature.

Martin Gagnon; Antoine Tahan; Philippe Bocher; Denis Thibault

2013-01-01T23:59:59.000Z

199

Improve the fatigue life of titanium alloys; Part 1  

SciTech Connect

Heat treatment and mechanical surface treatments of titanium alloys interact in unique ways to allow tailoring of surface microstructures for specific applications. Part 1 of this two-part review discusses the properties of titanium alloys in their various microstructural phases, and Part 2 will describe novel methods for improving fatigue performance by combining mechanical and thermal treatments. Microstructural modification by thermomechanical treatments is widely used to optimize the properties of high-strength titanium alloys for specific applications. However, because the surface of a mechanically loaded titanium part often experiences different conditions than the bulk, it makes sense in many applications to modify only the surface microstructure. By combining thermal treatments with mechanical working, stability of the resulting tailored surface is enhanced. Such stability is especially significant for resistance to fatigue crack nucleation and growth.

Wagner, L. (TU Hamburg-Harburg (Germany)); Gregory, J.K. (GKSS Research Center, Geesthacht (Germany))

1994-03-01T23:59:59.000Z

200

Polymer quenched prealloyed metal powder  

DOE Patents (OSTI)

A powder metallurgical process of preparing a sheet from a powder having an intermetallic alloy composition such as an iron, nickel or titanium aluminide. The sheet can be manufactured into electrical resistance heating elements having improved room temperature ductility, electrical resistivity, cyclic fatigue resistance, high temperature oxidation resistance, low and high temperature strength, and/or resistance to high temperature sagging. The iron aluminide has an entirely ferritic microstructure which is free of austenite and can include, in weight %, 4 to 32% Al, and optional additions such as .ltoreq.1% Cr, .gtoreq.0.05% Zr .ltoreq.2% Ti, .ltoreq.2% Mo, .ltoreq.1% Ni, .ltoreq.0.75% C, .ltoreq.0.1% B, .ltoreq.1% submicron oxide particles and/or electrically insulating or electrically conductive covalent ceramic particles, .ltoreq.1% rare earth metal, and/or .ltoreq.3 % Cu. The process includes forming a non-densified metal sheet by consolidating a powder having an intermetallic alloy composition such as by roll compaction, tape casting or plasma spraying, forming a cold rolled sheet by cold rolling the non-densified metal sheet so as to increase the density and reduce the thickness thereof and annealing the cold rolled sheet. The powder can be a water, polymer or gas atomized powder which is subjecting to sieving and/or blending with a binder prior to the consolidation step. After the consolidation step, the sheet can be partially sintered. The cold rolling and/or annealing steps can be repeated to achieve the desired sheet thickness and properties. The annealing can be carried out in a vacuum furnace with a vacuum or inert atmosphere. During final annealing, the cold rolled sheet recrystallizes to an average grain size of about 10 to 30 .mu.m. Final stress relief annealing can be carried out in the B2 phase temperature range.

Hajaligol, Mohammad R. (Midlothian, VA); Fleischhauer, Grier (Midlothian, VA); German, Randall M. (State College, PA)

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

E-Print Network 3.0 - assisted fatigue crack Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

and Grain-Boundary Adhesion Summary: unless they experience environmentally assisted subcritical growth during cyclic loading.7 Fatigue-crack... (moist air and dry N2). The...

202

Self-management associated with fatigue in patients with advanced cancer : a prospective longitudinal study.  

E-Print Network (OSTI)

??Cancer-related fatigue is one of the most distressing symptoms experienced by patients with advanced cancer. This doctoral study identified that patients with advanced cancer commonly (more)

Chan, Raymond

2014-01-01T23:59:59.000Z

203

Mechanism and estimation of fatigue crack initiation in austenitic stainless steels in LWR environments.  

SciTech Connect

The ASME Boiler and Pressure Vessel Code provides rules for the construction of nuclear power plant components. Figures I-9.1 through I-9.6 of Appendix I to Section III of the Code specify fatigue design curves for structural materials. However, the effects of light water reactor (LWR) coolant environments are not explicitly addressed by the Code design curves. Existing fatigue strain-vs.-life ({var_epsilon}-N) data illustrate potentially significant effects of LWR coolant environments on the fatigue resistance of pressure vessel and piping steels. This report provides an overview of fatigue crack initiation in austenitic stainless steels in LWR coolant environments. The existing fatigue {var_epsilon}-N data have been evaluated to establish the effects of key material, loading, and environmental parameters (such as steel type, strain range, strain rate, temperature, dissolved-oxygen level in water, and flow rate) on the fatigue lives of these steels. Statistical models are presented for estimating the fatigue {var_epsilon}-N curves for austenitic stainless steels as a function of the material, loading, and environmental parameters. Two methods for incorporating environmental effects into the ASME Code fatigue evaluations are presented. The influence of reactor environments on the mechanism of fatigue crack initiation in these steels is also discussed.

Chopra, O. K.; Energy Technology

2002-08-01T23:59:59.000Z

204

High temperature erosion and fatigue resistance of a detonation gun chromium carbide coating for steam turbines  

SciTech Connect

Chromium carbide based detonation gun coatings have been shown to be capable of protecting steam turbine components from particle erosion. To be usable, however, erosion resistant coatings must not degrade the fatigue characteristics of the coated components. Recent studies of the fatigue properties of a detonation gun coated martensitic substrate at 538 C (1,000 F) will be presented with an emphasis on its long term performance. This study will show the retention of acceptable fatigue performance of coated substrates into the high cycle regime, and will include a discussion on the mechanism of fatigue.

Quets, J.M.; Walsh, P.N. [Praxair Surface Technologies, Inc., Indianapolis, IN (United States); Srinivasan, V. [Westinghouse Electric Corp., Orlando, FL (United States); Tucker, R.C. Jr. [Praxair Surface Technologies, Inc., Indianapolis, IN (United States)

1994-12-31T23:59:59.000Z

205

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

206

Tensile fatigue behavior of tapered glass fiber reinforced epoxy composites containing nanoclay  

Science Journals Connector (OSTI)

Abstract Tensile fatigue behavior of tapered glass/epoxy laminates is investigated. The effect of nanoclay addition into the epoxy resin is examined. It is shown that the relative orientation between the adjacent belt layer and the cut layer has important influence on the fatigue life. The fatigue crack starts at the resin pocket and propagates along the interface between the belt layer and the core layer in the thicker section of the laminate. Crack propagation is mainly due to mode II crack failure. The addition of the clays enhances the resistance against this mode II crack propagation, and thus prolongs the fatigue life of the laminate.

S. Helmy; S.V. Hoa

2014-01-01T23:59:59.000Z

207

Development of a Water Environment Fatigue Design Curve for Austenitic Stainless Steels  

SciTech Connect

This note presents the technical basis for a proposed strain-rate and temperature independent fatigue design curve for austenitic stainless steels.

T. R. Leax

2002-12-19T23:59:59.000Z

208

E-Print Network 3.0 - anomolous fatigue crack Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Science ; Engineering 6 Cracking Resistance of Asphalt Rubber Mix Versus Summary: vs. Fracture Mechanics Conventional Fatigue Testing Crack initiation Fracture Mechanics Crack......

209

Design and fabrication of a bending rotation fatigue test rig for in situ electrochemical analysis during fatigue testing of NiTi shape memory alloy wires  

Science Journals Connector (OSTI)

The current investigation proposes a novel method for simultaneous assessment of the electrochemical and structural fatigue properties of nickel-titanium shape memory alloy (NiTi SMA) wires. The design and layout of an in situ electrochemical cell in a custom-made bending rotation fatigue (BRF) test rig is presented. This newly designed test rig allows performing a wide spectrum of experiments for studying the influence of fatigue on corrosion and vice versa. This can be achieved by performing ex situ and/or in situ measurements. The versatility of the combined electrochemical/mechanical test rig is demonstrated by studying the electrochemical behavior of NiTi SMA wires in 0.9% NaCl electrolyte under load. The ex situ measurements allow addressing various issues for example the influence of pre-fatigue on the localized corrosion resistance or the influence of hydrogen on fatigue life. Ex situ experiments showed that a pre-fatigued wire is more susceptible to localized corrosion. The synergetic effect can be concluded from the polarization studies and specifically from an in situ study of the open circuit potential (OCP) transients which sensitively react to the elementary repassivation events related to the local failure of the oxide layer. It can also be used as an indicator for identifying the onset of the fatigue failure.

Jenni Kristin Zglinski; Matthias Frotscher

2013-01-01T23:59:59.000Z

210

Design and fabrication of a bending rotation fatigue test rig for in situ electrochemical analysis during fatigue testing of NiTi shape memory alloy wires  

SciTech Connect

The current investigation proposes a novel method for simultaneous assessment of the electrochemical and structural fatigue properties of nickel-titanium shape memory alloy (NiTi SMA) wires. The design and layout of an in situ electrochemical cell in a custom-made bending rotation fatigue (BRF) test rig is presented. This newly designed test rig allows performing a wide spectrum of experiments for studying the influence of fatigue on corrosion and vice versa. This can be achieved by performing ex situ and/or in situ measurements. The versatility of the combined electrochemical/mechanical test rig is demonstrated by studying the electrochemical behavior of NiTi SMA wires in 0.9% NaCl electrolyte under load. The ex situ measurements allow addressing various issues, for example, the influence of pre-fatigue on the localized corrosion resistance, or the influence of hydrogen on fatigue life. Ex situ experiments showed that a pre-fatigued wire is more susceptible to localized corrosion. The synergetic effect can be concluded from the polarization studies and specifically from an in situ study of the open circuit potential (OCP) transients, which sensitively react to the elementary repassivation events related to the local failure of the oxide layer. It can also be used as an indicator for identifying the onset of the fatigue failure.

Neelakantan, Lakshman [Ruhr-Universitaet Bochum, Institute for Materials, 44801 Bochum (Germany); Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, 600 036 Chennai (India); Zglinski, Jenni Kristin; Eggeler, Gunther [Ruhr-Universitaet Bochum, Institute for Materials, 44801 Bochum (Germany); Frotscher, Matthias [Ruhr-Universitaet Bochum, Institute for Materials, 44801 Bochum (Germany); CORTRONIK GmbH, 18119 Rostock-Warnemuende (Germany)

2013-03-15T23:59:59.000Z

211

Composite metal membrane  

DOE Patents (OSTI)

A composite metal membrane including a first metal layer of Group IVB met or Group VB metals, the first metal layer sandwiched between two layers of an oriented metal of palladium, platinum or alloys thereof is provided together with a process for the recovery of hydrogen from a gaseous mixture including contacting a hydrogen-containing gaseous mixture with a first side of a nonporous composite metal membrane including a first metal of Group IVB metals or Group VB metals, the first metal layer sandwiched between two layers of an oriented metal of palladium, platinum or alloys thereof, and, separating hydrogen from a second side of the nonporous composite metal membrane.

Peachey, Nathaniel M. (Espanola, NM); Dye, Robert C. (Los Alamos, NM); Snow, Ronny C. (Los Alamos, NM); Birdsell, Stephan A. (Los Alamos, NM)

1998-01-01T23:59:59.000Z

212

Composite metal membrane  

DOE Patents (OSTI)

A composite metal membrane including a first metal layer of Group IVB met or Group VB metals, the first metal layer sandwiched between two layers of an oriented metal of palladium, platinum or alloys thereof is provided together with a process for the recovery of hydrogen from a gaseous mixture including contacting a hydrogen-containing gaseous mixture with a first side of a nonporous composite metal membrane including a first metal of Group IVB metals or Group VB metals, the first metal layer sandwiched between two layers of an oriented metal of palladium, platinum or alloys thereof, and, separating hydrogen from a second side of the nonporous composite metal membrane.

Peachey, N.M.; Dye, R.C.; Snow, R.C.; Birdsell, S.A.

1998-04-14T23:59:59.000Z

213

An Energy Based Fatigue Lifing Method for In-Service Components and Numerical Assessment of U10Mo Alloy Based Fuel Mini Plates.  

E-Print Network (OSTI)

??An energy based fatigue life prediction framework has been developed for calculation of remaining fatigue life of in service gas turbine materials. The purpose of (more)

Ozaltun, Hakan

2011-01-01T23:59:59.000Z

214

The Effect of Applied Pressure During Feeding of Critical Cast Aluminum Alloy Components With Particular Reference to Fatigue Resistance  

SciTech Connect

the medium to long freezing range alloys of aluminum such as A356, A357, A206, 319 for example are known to exhibit dispersed porosity, which is recognized as a factor affecting ductility, fracture toughness, and fatigue resistance of light alloy castings. The local thermal environment, for example, temperature gradient and freezing from velocity, affect the mode of solidification which, along with alloy composition, heat treatment, oxide film occlusion, hydrogen content, and the extent to which the alloy contracts on solidification, combine to exert strong effects on the porosity formation in such alloys. In addition to such factors, the availability of liquid metal and its ability to flow through the partially solidified casting, which will be affect by the pressure in the liquid metal, must also be considered. The supply of molten metal will thus be controlled by the volume of the riser available for feeding the particular casting location, its solidification time, and its location together with any external pressure that might be applied at the riser.

J.T. Berry; R. Luck; B. Zhang; R.P. Taylor

2003-06-30T23:59:59.000Z

215

A constructive empirical theory for metal fatigue under block cyclic loading  

Science Journals Connector (OSTI)

...for g. Note that our assumed g does not include explicit dependence...Military handbook (1998) MIL-HDBK-5H. Every single S-N curve...psi+c, for any constant c, does not affect the theory. Since...any constant c greater than 0, does not change the form of the evolution...

2008-01-01T23:59:59.000Z

216

Stress-corrosion fatigue-crack growth in a Zr-based bulk amorphous metal  

E-Print Network (OSTI)

potential does not suggest a Tafel or even linear dependencewith potential. This Tafel or linear dependence is not

Schroeder, V.; Ritchie, R.O.

2005-01-01T23:59:59.000Z

217

The fatigue of high-strength fused silica optical fibers in low humidity q  

E-Print Network (OSTI)

the effect of humidity on the kinetics of subcritical crack growth in high strength optical fibers that the rate of subcritical crack growth is given by dc dt ¼ A exp n KI KIC ; ð1? where A and n are fatigue by assuming a simple chemical kinetics model for fatigue in which the reaction rate between water and silica

Matthewson, M. John

218

Mitigation of Fatigue Loads Using Individual Pitch Control of Wind Turbines Based on FAST  

E-Print Network (OSTI)

Mitigation of Fatigue Loads Using Individual Pitch Control of Wind Turbines Based on FAST Yunqian University, China jiz@seu.edu.cn Abstract-With the increase of wind turbine dimension and capacity, the wind turbine structures are subjected to prominent loads and fatigue which would reduce the lifetime of wind

Chen, Zhe

219

THERMAL FATIGUE AND FAILURE OF ELECTRONIC POWER DEVICE SUBSTRATES. S. Pietranico1&2  

E-Print Network (OSTI)

. For large thermal amplitudes, the failure occurs in DBC substrates, which are copper/ceramic- 1 - THERMAL FATIGUE AND FAILURE OF ELECTRONIC POWER DEVICE SUBSTRATES. S. Pietranico1&2 , S their thermal fatigue and failure. For example, for power modules mounted on the engine of an aircraft

Paris-Sud XI, Université de

220

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

E-Print Network (OSTI)

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

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Effect of material heat treatment on fatigue crack initiation in austenitic stainless steels in LWR environments.  

SciTech Connect

The ASME Boiler and Pressure Vessel Code provides rules for the design of Class 1 components of nuclear power plants. Figures I-9.1 through I-9.6 of Appendix I to Section III of the Code specify design curves for applicable structural materials. However, the effects of light water reactor (LWR) coolant environments are not explicitly addressed by the Code design curves. The existing fatigue strain-vs.-life ({var_epsilon}-N) data illustrate potentially significant effects of LWR coolant environments on the fatigue resistance of pressure vessel and piping steels. Under certain environmental and loading conditions, fatigue lives of austenitic stainless steels (SSs) can be a factor of 20 lower in water than in air. This report presents experimental data on the effect of heat treatment on fatigue crack initiation in austenitic Type 304 SS in LWR coolant environments. A detailed metallographic examination of fatigue test specimens was performed to characterize the crack morphology and fracture morphology. The key material, loading, and environmental parameters and their effect on the fatigue life of these steels are also described. Statistical models are presented for estimating the fatigue {var_epsilon}-N curves for austenitic SSs as a function of material, loading, and environmental parameters. Two methods for incorporating the effects of LWR coolant environments into the ASME Code fatigue evaluations are presented.

Chopra, O. K.; Alexandreanu, B.; Shack, W. J.; Energy Technology

2005-07-31T23:59:59.000Z

222

Estimation of Muscle Fatigue during Cyclic Contractions Using Source Separation Techniques  

Science Journals Connector (OSTI)

Previous research studies have reported that spectral compression of the surface Electromyogram (SEMG) towards lower frequencies is associated with onset of localized muscle fatigue. One reason for this spectral compression has been attributed to motor ... Keywords: ICA, Muscle fatigue, Source separation, Surface EMG

Ganesh R. Naik; Dinesh K. Kumar; Katherine Wheeler; Sridhar P. Arjunan

2009-12-01T23:59:59.000Z

223

Delamination at Thick Ply Drops in Carbon and Glass Fiber Laminates Under Fatigue Loading  

E-Print Network (OSTI)

1 Delamination at Thick Ply Drops in Carbon and Glass Fiber Laminates Under Fatigue Loading Daniel in composites with thickness tapering has been a concern in applications of carbon fibers. This study explored the resistance to delamination under fatigue loading of carbon and glass fiber prepreg laminates with the same

224

Probabilistic fatigue life prediction model for alloys with defects: applied to A206  

SciTech Connect

Presented here is a model for the prediction of fatigue life based on the statistical distribution of pores, intermetallic particles and grains. This has been applied to a cast Al alloy A206, before and after friction stir processing (FSP). The model computes the probability to initiate a small crack based on the probability of finding combinations of defects and grains on the surface. The crack initiation and propagation life of small cracks due to these defect and grain combinations are computed and summed to obtain the total fatigue life. The defect and grain combinations are ranked according to total fatigue life and the failure probability computed. Bending fatigue experiments were carried out on A206 before and after FSP. FSP eliminated the porosity, broke down the particles and refined the microstructure. The model predicted the fatigue life of A206 before and after FSP well. The cumulative probability distribution vs. fatigue life was fitted to a three parameter Weibull distribution function. The scatter reduced after FSP and the threshold of fatigue life increased. The potential improvement in the fatigue life of A206 for a microstructure consisting of a finer distribution of particle sizes after FSP was predicted using the model.

Kapoor, Rajeev; Sree Hari Rao, V.; Mishra, Rajiv S.; Baumann, John A.; Grant, Glenn J.

2011-05-31T23:59:59.000Z

225

CONTINUOUS FATIGUE ASSESSMENT OF AN OFFSHORE WIND TURBINE USING A LIMITED NUMBER OF VIBRATION SENSORS  

E-Print Network (OSTI)

CONTINUOUS FATIGUE ASSESSMENT OF AN OFFSHORE WIND TURBINE USING A LIMITED NUMBER OF VIBRATION, Modal decomposition and expansion, Finite Element Model INTRODUCTION Offshore wind turbines are exposed locations along the structure. This is not the case though in monopile offshore wind turbines, where fatigue

Boyer, Edmond

226

A unified method for the analysis of nonlinear viscoelasticity and fatigue cracking of asphalt mixtures using the dynamic mechanical analyzer  

E-Print Network (OSTI)

..................................................................................... 69 Energy Method to Characterize Fatigue Damage in Asphalt Pavements .................................................................................... 70 Definition of Dissipated Energy (DE) Components.... Dallas N. Little Fatigue cracking is one of the primary modes of distress in asphalt pavements that has an important economic impact. Fatigue resistance characterization of an asphalt mixture is a complex issue due to: (i) composite nature...

Castelo Branco, Veronica Teixeira Franco

2009-05-15T23:59:59.000Z

227

Fatigue Threshold R-Curve Behavior of Grain Bridging Ceramics: Role of Grain Size and Grain-Boundary Adhesion  

E-Print Network (OSTI)

unless they experience environmentally assisted subcritical growth during cyclic loading.7 Fatigue-crack (moist air and dry N2). The fine-grained micro- structure showed higher fatigue thresholds at short crack sizes, while the coarse-grained microstructure demonstrated higher fatigue thresholds at long crack

Kruzic, Jamie

228

Reversible Bending Fatigue Testing on Zry-4 Surrogate Rods  

SciTech Connect

Testing high-burnup spent nuclear fuel (SNF) presents many challenges in areas such as specimen preparation, specimen installation, mechanical loading, load control, measurements, data acquisition, and specimen disposal because these tasks are complicated by the radioactivity of the test specimens. Research and comparison studies conducted at Oak Ridge National Laboratory (ORNL) resulted in a new concept in 2010 for a U-frame testing setup on which to perform hot-cell reversible bending fatigue testing. Subsequently, the three-dimensional finite element analysis and the engineering design of components were completed. In 2013 the ORNL team finalized the upgrade of the U-frame testing setup and the integration of the U-frame setup into a Bose dual linear motor test bench to develop a cyclic integrated reversible-bending fatigue tester (CIRFT). A final check was conducted on the CIRFT test system in August 2013, and the CIRFT was installed in the hot cell in September 2013 to evaluate both the static and dynamic mechanical response of SNF rods under simulated loads. The fatigue responses of Zircaloy-4 (Zry-4) cladding and the role of pellet pellet and pellet clad interactions are critical to SNF vibration integrity, but such data are not available due to the unavailability of an effective testing system. While the deployment of the developed CIRFT test system in a hot cell will provide the opportunity to generate the data, the use of a surrogate rod has proven quite effective in identifying the underlying deformation mechanism of an SNF composite rod under an equivalent loading condition. This paper presents the experimental results of using surrogate rods under CIRFT reversible cyclic loading. Specifically, monotonic and cyclic bending tests were conducted on surrogate rods made of a Zry-4 tube and alumina pellet inserts, both with and without an epoxy bond.

Wang, Jy-An John [ORNL; Wang, Hong [ORNL; Bevard, Bruce Balkcom [ORNL; Howard, Rob L [ORNL

2014-01-01T23:59:59.000Z

229

A new muscle fatigue and recovery model and its ergonomics application in human simulation  

E-Print Network (OSTI)

Although automatic techniques have been employed in manufacturing industries to increase productivity and efficiency, there are still lots of manual handling jobs, especially for assembly and maintenance jobs. In these jobs, musculoskeletal disorders (MSDs) are one of the major health problems due to overload and cumulative physical fatigue. With combination of conventional posture analysis techniques, digital human modelling and simulation (DHM) techniques have been developed and commercialized to evaluate the potential physical exposures. However, those ergonomics analysis tools are mainly based on posture analysis techniques, and until now there is still no fatigue index available in the commercial software to evaluate the physical fatigue easily and quickly. In this paper, a new muscle fatigue and recovery model is proposed and extended to evaluate joint fatigue level in manual handling jobs. A special application case is described and analyzed by digital human simulation technique.

Ma, Liang; Bennis, Fouad; Zhang, Wei; Guillaume, Franois; 10.1080/17452759.2010.504056

2010-01-01T23:59:59.000Z

230

A new muscle fatigue and recovery model and its ergonomics application in human simulation  

E-Print Network (OSTI)

Although automatic techniques have been employed in manufacturing industries to increase productivity and efficiency, there are still lots of manual handling jobs, especially for assembly and maintenance jobs. In these jobs, musculoskeletal disorders (MSDs) are one of the major health problems due to overload and cumulative physical fatigue. With combination of conventional posture analysis techniques, digital human modelling and simulation (DHM) techniques have been developed and commercialized to evaluate the potential physical exposures. However, those ergonomics analysis tools are mainly based on posture analysis techniques, and until now there is still no fatigue index available in the commercial software to evaluate the physical fatigue easily and quickly. In this paper, a new muscle fatigue and recovery model is proposed and extended to evaluate joint fatigue level in manual handling jobs. A special application case is described and analyzed by digital human simulation technique.

Ma, Liang; Bennis, Fouad; Zhang, Wei; Guillaume, Franois

2009-01-01T23:59:59.000Z

231

Quantifying fatigue generated in high strain rate cyclic loading of Norway spruce  

Science Journals Connector (OSTI)

Papermaking especially mechanical pulping consumes much energy. To reduce this energy consumption one has to understand and exploit the phenomena present during the pulping. An important phenomenon to understand is wood fatigue. We quantitatively measure the fatigue generated during high strain rate cyclic loading of spruce wood performed under conditions resembling those present during mechanical pulping. We impacted the samples with 5% strain pulses at 500 Hz. The radial direction stiffness drop in the samples was quantified by 500 kHz ultrasonic through-transmission postimpacting. The depth profile of the generated fatigue was also determined. A dependency of the amount of fatigue generated during cyclic straining on the moisture content was detected. A hypothesis about the temporal and spatial evolution of the fatigue during the process is presented. The results supporting the hypothesis provide insight into wood behavior under mechanical pulping conditions.

Ari Salmi; Lauri Salminen; Edward Hggstrm

2009-01-01T23:59:59.000Z

232

Degradation of nanostructured bainitic steel under rolling contact fatigue  

E-Print Network (OSTI)

treatment and af- ter the longest running RCF test were determined using a Philips PW1830 vertical di?ractometer with a CuK? radiation. Scans were performed from 30 to 125 #0;, with a step size of 0.05 #0; and a dwell time of 26 s. A divergence slit of 0... torsion with compressive mean stress: in: Mechanics of Materials: Japan Society of Mechanical Engi- neers, Tokyo, Japan, 2000: pp. 241243. [18] K. Burkart, H. Bomas, R. Schroeder, H.-W. Zoch: Rolling contact and compression-torsion fatigue of 52100 steel...

Solano-Alvarez, W.; Pickering, E. J.; Bhadeshia, H. K. D. H.

2014-09-06T23:59:59.000Z

233

Predicting the fatigue life of asphalt concrete overlay systems  

E-Print Network (OSTI)

will simply be the da dN "y-intercept" and n is the slope of the curve. From the procedure listed above Saraf found the parameter A to be affected by the viscosity of the asphalt binder used in the mix, a decrease in viscosity gave an increase in A...PREDICTING THE FATIGUE LIFE OF ASPHALT CONCRETE OVERLAY SYSTEMS A Thesis by FREDERICK PHILIP GERMANN Submitted to the Graduate College of Texas A&M University in Partial fulfillment of the requirement for the degree of MASTER OF SCIENCE May...

Germann, Frederick P

1979-01-01T23:59:59.000Z

234

Stress intensity factors for small fatigue cracks in tubular joints  

SciTech Connect

Some simple fracture mechanics models are presented for estimating stress intensity factors for small surface fatigue cracks in welded tubular joints. Model predictions are compared with large-scale experimental results for the cases of in-plane and out-of-plane bending in multi-brace tubular nodes. It is demonstrated that reasonably accurate predictions of the stress intensity factor are possible using a modified flat plate solution if the effects of weld geometry, load shedding and crack shape are adequately accounted for.

Monahan, C.C. [Memorial Univ. of Newfoundland, St. Johns, Newfoundland (Canada). Centre for Cold Ocean Resources Engineering; Dover, W.D. [University College, London (United Kingdom)

1995-12-31T23:59:59.000Z

235

Mechanochemical processing for metals and metal alloys  

DOE Patents (OSTI)

A set of processes for preparing metal powders, including metal alloy powders, by ambient temperature reduction of a reducible metal compound by a reactive metal or metal hydride through mechanochemical processing. The reduction process includes milling reactants to induce and complete the reduction reaction. The preferred reducing agents include magnesium and calcium hydride powders. A process of pre-milling magnesium as a reducing agent to increase the activity of the magnesium has been established as one part of the invention.

Froes, Francis H. (Moscow, ID); Eranezhuth, Baburaj G. (Moscow, ID); Prisbrey, Keith (Moscow, ID)

2001-01-01T23:59:59.000Z

236

Fatigue and environmentally assisted cracking in light water reactors  

SciTech Connect

Fatigue and stress corrosion cracking (SCC) for low-alloy steel used in piping and in steam generator and reactor pressure vessels have been investigated. Fatigue data were obtained on medium-sulfur-content A533-Gr B and A106-Gr B steels in high-purity (HP) deoxygenated water, in simulated pressurized water reactor water, and in air. Analytical studies focused on the behavior of carbon steels in boiling water reactor (BWR) environments. Crack-growth rates of composite fracture-mechanics specimens of A533-Gr B/Inconel-182/Inconel-600 (plated with nickel) and homogeneous specimens of A533-Gr B steel were determined under small-amplitude cyclic loading in HP water with {approx}300 pbb dissolved oxygen. Radiation-induced segregation and irradiation-assisted SCC of Type 304 SS after accumulation of relatively high fluence also have been investigated. Microchemical and microstructural changes in HP and commercial-purity Type 304 SS specimens from control-blade absorber tubes used in two operating BWRs were studied by Auger electron spectroscopy and scanning electron microscopy, and slow-strain-rate tensile tests were conducted on tubular specimens in air and in simulated BWR water at 289{degrees}C.

Kassner, T.F.; Ruther, W.E.; Chung, H.M.; Hicks, P.D.; Hins, A.G.; Park, J.Y.; Shack, W.J.

1992-03-01T23:59:59.000Z

237

Low cycle fatigue behavior of Zircaloy-2 at room temperature  

Science Journals Connector (OSTI)

Abstract Fuel cladding and pressure tubes of Zircaloy-2 in pressurized light and heavy water nuclear reactors experience plastic strain cycles due to power fluctuations in the reactor, such strain cycles cause low cycle fatigue (LCF) and could be life limiting factor for them. Factors like strain rate, strain amplitude and temperature are known to have marked influence on LCF behavior. The effect of strain rate from 10?2 to 10?4s?1 on LCF behavior of Zircaloy-2 was studied, at different strain amplitudes between 0.50% and 1.25% at room temperature. Fatigue life was decreased with lowering of strain rate from 10?2 to 10?4s?1 at all the strain amplitudes studied. While there was cyclic softening at lower strain amplitudes (??t/2?0.60%) cyclic hardening was exhibited at higher strain amplitudes (??t/2?1.00%) at all the strain rates. Further, there was secondary cyclic hardening during the later stage of cycling at all the strain amplitudes and the strain rates. Cyclic stressstrain hysteresis loops at the lowest strain rate of 10?4s?1 were found to be heavily serrated, resulting from dynamic strain aging (DSA). There was significant effect of strain rate on dislocation substructure. The results are discussed in terms of high concentration of point defects generated during cyclic straining and their role in enhancing interaction between solutes and dislocations.

G. Sudhakar Rao; J.K. Chakravartty; Saibaba Nudurupati; G.S. Mahobia; Kausik Chattopadhyay; N.C. Santhi Srinivas; Vakil Singh

2013-01-01T23:59:59.000Z

238

Human performance modeling for system of systems analytics :soldier fatigue.  

SciTech Connect

The military has identified Human Performance Modeling (HPM) as a significant requirement and challenge of future systems modeling and analysis initiatives as can be seen in the Department of Defense's (DoD) Defense Modeling and Simulation Office's (DMSO) Master Plan (DoD 5000.59-P 1995). To this goal, the military is currently spending millions of dollars on programs devoted to HPM in various military contexts. Examples include the Human Performance Modeling Integration (HPMI) program within the Air Force Research Laboratory, which focuses on integrating HPMs with constructive models of systems (e.g. cockpit simulations) and the Navy's Human Performance Center (HPC) established in September 2003. Nearly all of these initiatives focus on the interface between humans and a single system. This is insufficient in the era of highly complex network centric SoS. This report presents research and development in the area of HPM in a system-of-systems (SoS). Specifically, this report addresses modeling soldier fatigue and the potential impacts soldier fatigue can have on SoS performance.

Lawton, Craig R.; Campbell, James E.; Miller, Dwight Peter

2005-10-01T23:59:59.000Z

239

Multiaxial low-cycle fatigue damage evaluation using a. c. potential method for alloy 738LC superalloy  

SciTech Connect

This paper studies tension/torsion multiaxial low-cycle fatigue lives and creep-fatigue damage evaluation for Alloy 738LC superalloy. Tension/torsion creep-fatigue tests were carried out using hollow cylinder specimens and multiaxial creep-fatigue lives were obtained. The Mises' equivalent strain correlated the multiaxial low cycle fatigue lives within a factor of two scatter band. An a.c. potential method is developed to detect the creep-fatigue damage associated with crack nucleation and extension. A.c. potentials at high frequencies accurately detect the creep-fatigue damage from the early stage of life while those at low frequencies detect that in the final stage of life. A.c. potentials at high frequencies detect the crack density, defined as the total crack length per unit area, and maximum crack length more sensitivity than those at low frequencies.

Isono, Yoshitada; Sakane, Masao; Ohnami, Masateru (Ritsumeikan Univ., Kyoto (Japan). Dept. of Mechanical Engineering); Fujiyama, Kazunari (Toshiba Corp., Yokohama (Japan). Heavy Apparatus Engineering Lab.)

1994-10-01T23:59:59.000Z

240

Low cycle fatigue crack initiation life assessment of HY-100 undermatched weld  

SciTech Connect

An evaluation is conducted of several approaches to the prediction of low cycle fatigue crack initiation in HY-100 welds of an undermatched weldment. FEM analyses and experiments using various types of low cycle fatigue specimens were conducted and their results were compared with the results of such theoretical algorithms as Neuber's rule. A two-surface cyclic plasticity algorithm was implanted in a FEM code's user subroutine in order to simulate the material's cyclic stress-strain behavior under cyclic loading conditions; fatigue tests ranging from small, standard smooth specimens to notched cylindrical specimens with notch constraint were conducted for HY-100. 11 refs.

Wang, K.; Shah, R.; Yuan, D.; Kleinosky, M.J.

1993-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Metal-phosphate binders  

DOE Patents (OSTI)

A metal-phosphate binder is provided. The binder may include an aqueous phosphoric acid solution, a metal-cation donor including a metal other than aluminum, an aluminum-cation donor, and a non-carbohydrate electron donor.

Howe, Beth Ann [Lewistown, IL; Chaps-Cabrera, Jesus Guadalupe [Coahuila, MX

2009-05-12T23:59:59.000Z

242

Ultrasonic detection of fatigue damage in glass-epoxy composites  

SciTech Connect

Energy storage flywheels fabricated of S2 glass-epoxy composite were studied to determine the behavior of the ultrasonic properties as a function of strain history and to identify possible predictors of incipient failure. Tensile specimens of the flywheel material were loaded uniaxially, and the ultrasonic properties (i.e., the shear and longitudinal wave velocities and the attenuation) were measured as a function of strain. Finished flywheels were similarly tested at various stages during cyclic spin testing; in addition, the polar backscattering intensity as a function of fatigue cycle was recorded. The velocities are excellent indicators of the maximum strain incurred at each point of the flywheel, and the attenuation delineates the region in which the stress is high enough to initiate microcracking in the matrix.

Simpson, W.A. Jr.; McClung, R.W.

1990-01-01T23:59:59.000Z

243

Metal Hydrides - Science Needs  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Storage Grand Challenge Pre-Solicitation Meeting, June 19, 2003 1 Metal Hydrides - Science Needs TRADITIONAL METALLIC HYDRIDES: 1.5 to 2 wt.% H. Well studied. COMPLEX...

244

Probing metal solidification nondestructively  

NLE Websites -- All DOE Office Websites (Extended Search)

Probing metal solidification nondestructively This is the first time that high-energy protons have been used to nondestructively image a large metal sample during melting and...

245

Probing metal solidification nondestructively  

NLE Websites -- All DOE Office Websites (Extended Search)

Probing metal solidification nondestructively This is the first time that high-energy protons have been used to nondestructively image a large metal sample during melting...

246

Report on Assessment of Environmentally--Assisted Fatigue for LWR Extended  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

on Assessment of Environmentally--Assisted Fatigue for LWR on Assessment of Environmentally--Assisted Fatigue for LWR Extended Service Conditions Report on Assessment of Environmentally--Assisted Fatigue for LWR Extended Service Conditions This report provides an update on the assessment of environmentally-assisted fatigue for light water reactor (LWR) extended service conditions. The report is a deliverable in FY11 under the work package for LWRS under the Advanced Reactor Concepts. Most of the current fleet of aging LWRs were designed using the 1970s version of the ASME Boiler and Pressure Vessels Code, Section III, and are reaching their design lifetime of 30-40 yrs. For economic reasons, the utilities have great interest in extending the operating life of the plants via the Nuclear Regulatory Commission (NRC) licensing renewal application

247

Report on Assessment of Environmentally--Assisted Fatigue for LWR Extended  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

on Assessment of Environmentally--Assisted Fatigue for LWR on Assessment of Environmentally--Assisted Fatigue for LWR Extended Service Conditions Report on Assessment of Environmentally--Assisted Fatigue for LWR Extended Service Conditions This report provides an update on the assessment of environmentally-assisted fatigue for light water reactor (LWR) extended service conditions. The report is a deliverable in FY11 under the work package for LWRS under the Advanced Reactor Concepts. Most of the current fleet of aging LWRs were designed using the 1970s version of the ASME Boiler and Pressure Vessels Code, Section III, and are reaching their design lifetime of 30-40 yrs. For economic reasons, the utilities have great interest in extending the operating life of the plants via the Nuclear Regulatory Commission (NRC) licensing renewal application

248

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

Science Journals Connector (OSTI)

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

Sanjay Mathur; Prakash Chandra Gope

2007-01-01T23:59:59.000Z

249

Better postdiagnosis diet quality is associated with less cancer-related fatigue in breast cancer survivors  

Science Journals Connector (OSTI)

A comprehensive understanding of the role of modifiable health behaviors in effective management of cancer-related fatigue is needed. Among breast cancer survivors, we examined how postdiagnosis diet quality, ...

Stephanie M. George; Catherine M. Alfano

2014-12-01T23:59:59.000Z

250

Estimation of Fatigue Damage for an Austenitic Stainless Steel (SUS304) Using Magnetic Methods  

SciTech Connect

There are some fatigue damage estimation methods of the austenitic stainless steel that uses the martensitic transformation. For instance, they are the remanent magnetization method, the excitation method, and so on. Those two methods are being researched also in our laboratory now. In the remanent magnetization method, it is well known that the relation between fatigue damage and the remanent magnetization is simple, clear, and reproducible. However, this method has the disadvantage to need a special magnetizer. This method cannot be easily used on the site such as the factory. On the other hand, because the special magnetizer is unnecessary, the excitation method can use easily on the site. The output signal of this method is small. In this paper, two fatigue evaluation methods such as the remanent magnetization method and the excitation method are introduced. In addition, we report on the result of comparing the fatigue evaluation performances of two methods.

Oka, M. [Department of Computer and Control Engineering, Oita National College of Technology, 1666 Maki, Oita, 870-0152 (Japan); Yakushiji, T. [Department of Mechanical Engineering, Oita National College of Technology, 1666 Maki, Oita, 870-0152 (Japan); Tsuchida, Y.; Enokizono, M. [Department of Electrical and Electronic Engineering, Faculty of Engineering, Oita University, 700 Dannoharu, Oita, 870-1192 (Japan)

2007-03-21T23:59:59.000Z

251

SUBSPACE-BASED DETECTION OF FATIGUE DAMAGE ON JACKET SUPPORT STRUCTURES OF OFFSHORE WIND TURBINES  

E-Print Network (OSTI)

SUBSPACE-BASED DETECTION OF FATIGUE DAMAGE ON JACKET SUPPORT STRUCTURES OF OFFSHORE WIND TURBINES damage in real size structural components of offshore wind turbines. KEYWORDS : Damage detection, Offshore wind turbines, Numerical response simulation. INTRODUCTION Offshore wind turbines are exposed

Paris-Sud XI, Université de

252

Analytical and Experimental Investigation for Distortion-Induced Fatigue in Steel Bridges  

E-Print Network (OSTI)

Distortion-induced fatigue has been extensively studied; however, retrofit techniques currently used are expensive and/or time consuming to implement. These retrofit techniques primarily fall into two categories--stiffening or softening the weak web...

Hartman, Amanda

2013-08-31T23:59:59.000Z

253

Repair of Steel Bridge Girders Damaged by Distortion-Induced Fatigue  

E-Print Network (OSTI)

Several studies have identified distortion-induced fatigue as the leading cause of cracks in steel bridges built prior to the mid-1980s. Experimental and computer simulations of 914-mm (36-in.) deep girder-cross frame subassemblies subjected...

Nagati, Amr Daniel

2012-08-31T23:59:59.000Z

254

Fatigue Enhancement of Category E' Detailsin Steel Bridge Girders Using CFRP Materials  

E-Print Network (OSTI)

Carbon Fiber Reinforced Polymer (CFRP) composite overlay elements were developed to improve the fatigue performance of Category E' steel details. By increasing the stiffness of the detail with the CFRP overlay, the stress demand at the weld...

Kaan, Benjamin Nicolaas

2008-01-01T23:59:59.000Z

255

Effect of stress ratio on fatigue life of GFRP composites for WT blade  

Science Journals Connector (OSTI)

Fatigue life of GFRP (glass-fiber reinforced plastic) composites used in wind turbine rotor blades has been evaluated considering the glass fiber orientations. Three different laminate composites with the resp...

Yong-Hak Huh; Jae-Hyun Lee; Dong-Jin Kim

2012-07-01T23:59:59.000Z

256

An analytical study of rail grinding optimization for rail-head fatigue defect prevention  

E-Print Network (OSTI)

and increased train traffic on the remaining routes. These changes in railroad industry practice have caused an increase in the rate of occurrence of rail head fatigue defects, one potential cause of train derailment. The primary form of maintenance employed...

Jones, Scott Laurence

1997-01-01T23:59:59.000Z

257

Fatigue of polycrystalline silicon for MEMS applications: Crack growth and stability under resonant loading conditions  

E-Print Network (OSTI)

S.B. , 1999. Subcritical crack growth in silicon MEMS. J.appearance of subcritical crack growth in the absence ofbe mistaken for subcritical fatigue-crack growth when the

Muhlstein, C.L.; Howe, R.T.; Ritchie, R.O.

2001-01-01T23:59:59.000Z

258

Environmental effects on fatigue and lifetime predictions for silica optical fibers  

E-Print Network (OSTI)

reliability of optical fibers is usually assessed using the subcritical crack growth model for fatigue defects (normally assumed to be cracks) to cause the defects to grow at applied stress levels which do

Matthewson, M. John

259

Trending: Metal Oxo Bonds  

NLE Websites -- All DOE Office Websites (Extended Search)

Trending: Metal Oxo Bonds Trending: Metal Oxo Bonds Trending: Metal Oxo Bonds Print Wednesday, 29 May 2013 00:00 Metal oxides are important for scientific and technical applications in a variety of disciplines, including materials science, chemistry, and biology. Highly covalent metal-oxygen multiple bonds (metal oxos) are the building blocks of metal oxides and have a bearing on the oxide's desirable chemical, magnetic, electronic, and thermal properties. The lack of a more sophisticated grasp of bonding in metal oxides constitutes a roadblock to innovation in a wide variety of important emergent technologies, including industrial catalysis, biomimetic transformations, and artificial photosynthesis. To address this problem, a research team from four national laboratories, three Department of Energy synchrotron user facilities, and the University of Washington has applied spectroscopic and computational analyses to a number of metal oxides, quantifying trends in metal oxo bonding for groups of metals across the periodic table.

260

Laboratory Evaluation of Hot-Mix Asphalt Concrete Fatigue Cracking Resistance  

E-Print Network (OSTI)

LABORATORY EVALUATION OF HOT-MIX ASPHALT CONCRETE FATIGUE CRACKING RESISTANCE A Thesis by BRANDON PARKER JAMISON 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 December 2010 Major Subject: Civil Engineering LABORATORY EVALUATION OF HOT-MIX ASPHALT CONCRETE FATIGUE CRACKING RESISTANCE A Thesis by BRANDON PARKER JAMISON Submitted to the Office of Graduate...

Jamison, Brandon Parker

2012-02-14T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Creep-fatigue of High Temperature Materials for VHTR: Effect of Cyclic Loading and Environment  

SciTech Connect

Alloy 617 is the one of the leading candidate materials for Intermediate Heat eXchangers (IHX) of a Very High Temperature Reactor (VHTR). System start-ups and shut-downs as well as power transients will produce low cycle fatigue (LCF) loadings of components. Furthermore, the anticipated IHX operating temperature, up to 950C, is in the range of creep so that creep-fatigue interaction, which can significantly increase the fatigue crack growth, may be one of the primary IHX damage modes. To address the needs for Alloy 617 codification and licensing, a significant creep-fatigue testing program is underway at Idaho National Laboratory. Strain controlled LCF tests including hold times up to 1800s at maximum tensile strain were conducted at total strain range of 0.3% and 0.6% in air at 950C. Creep-fatigue testing was also performed in a simulated VHTR impure helium coolant for selected experimental conditions. The creep-fatigue tests resulted in failure times up to 1000 hrs. Fatigue resistance was significantly decreased when a hold time was added at peak stress and when the total strain was increased. The fracture mode also changed from transgranular to intergranular with introduction of a tensile hold. Changes in the microstructure were methodically characterized. A combined effect of temperature, cyclic and static loading and environment was evidenced in the targeted operating conditions of the IHX. This paper This paper reviews the data previously published by Carroll and co-workers in references 10 and 11 focusing on the role of inelastic strain accumulation and of oxidation in the initiation and propagation of surface fatigue cracks.

Celine Cabet; L. Carroll; R. Wright; R. Madland

2011-05-01T23:59:59.000Z

262

Mechanisms for Fatigue of Micron-Scale Silicon StructuralFilms  

SciTech Connect

Although bulk silicon is not susceptible to fatigue,micron-scale silicon is. Several mechanisms have been proposed to explainthis surprising behavior although the issue remains contentious. Here wedescribe published fatigue results for micron-scale thin siliconfilms andfind that in general they display similar trends, in that lower cyclicstresses result in larger number of cycles to failure in stress-lifetimedata. We further show that one of two classes of mechanisms is invariablyproposed to explain the phenomenon. The first class attributes fatigue toa surface effect caused by subcritical (stable) cracking in thesilicon-oxide layer, e.g., reaction-layer fatigue; the second classproposes that subcritical cracking in the silicon itself is the cause offatigue in Si films. It is our contention that results to date fromsingle and poly crystalline silicon fatigue studies provide no convincingexperimentalevidence to support subcritical cracking in the silicon.Conversely, the reaction-layer mechanism is consistent with existingexperimental results, and moreover provides a rational explanation forthe marked difference in fatigue behavior of bulk and micron-scalesilicon.

Alsem, Daan Hein; Pierron, Olivier N.; Stach, Eric A.; Muhlstein,Christopher L.; Ritchie, Robert O.

2006-11-03T23:59:59.000Z

263

Random Slip Model of Fatigue and Coffin's Law  

Science Journals Connector (OSTI)

... the model I have proposed2. According to this model the surface of the metal is roughened by a more or less random distribution of slip steps. Thus hills and valleys ...

A. N. MAY

1960-11-12T23:59:59.000Z

264

Heavy metal biosensor  

DOE Patents (OSTI)

Compositions and methods are provided for detection of certain heavy metals using bacterial whole cell biosensors.

Hillson, Nathan J; Shapiro, Lucille; Hu, Ping; Andersen, Gary L

2014-04-15T23:59:59.000Z

265

Trending: Metal Oxo Bonds  

NLE Websites -- All DOE Office Websites (Extended Search)

Trending: Metal Oxo Bonds Print Trending: Metal Oxo Bonds Print Metal oxides are important for scientific and technical applications in a variety of disciplines, including materials science, chemistry, and biology. Highly covalent metal-oxygen multiple bonds (metal oxos) are the building blocks of metal oxides and have a bearing on the oxide's desirable chemical, magnetic, electronic, and thermal properties. The lack of a more sophisticated grasp of bonding in metal oxides constitutes a roadblock to innovation in a wide variety of important emergent technologies, including industrial catalysis, biomimetic transformations, and artificial photosynthesis. To address this problem, a research team from four national laboratories, three Department of Energy synchrotron user facilities, and the University of Washington has applied spectroscopic and computational analyses to a number of metal oxides, quantifying trends in metal oxo bonding for groups of metals across the periodic table.

266

Trending: Metal Oxo Bonds  

NLE Websites -- All DOE Office Websites (Extended Search)

Trending: Metal Oxo Bonds Print Trending: Metal Oxo Bonds Print Metal oxides are important for scientific and technical applications in a variety of disciplines, including materials science, chemistry, and biology. Highly covalent metal-oxygen multiple bonds (metal oxos) are the building blocks of metal oxides and have a bearing on the oxide's desirable chemical, magnetic, electronic, and thermal properties. The lack of a more sophisticated grasp of bonding in metal oxides constitutes a roadblock to innovation in a wide variety of important emergent technologies, including industrial catalysis, biomimetic transformations, and artificial photosynthesis. To address this problem, a research team from four national laboratories, three Department of Energy synchrotron user facilities, and the University of Washington has applied spectroscopic and computational analyses to a number of metal oxides, quantifying trends in metal oxo bonding for groups of metals across the periodic table.

267

Trending: Metal Oxo Bonds  

NLE Websites -- All DOE Office Websites (Extended Search)

Trending: Metal Oxo Bonds Print Trending: Metal Oxo Bonds Print Metal oxides are important for scientific and technical applications in a variety of disciplines, including materials science, chemistry, and biology. Highly covalent metal-oxygen multiple bonds (metal oxos) are the building blocks of metal oxides and have a bearing on the oxide's desirable chemical, magnetic, electronic, and thermal properties. The lack of a more sophisticated grasp of bonding in metal oxides constitutes a roadblock to innovation in a wide variety of important emergent technologies, including industrial catalysis, biomimetic transformations, and artificial photosynthesis. To address this problem, a research team from four national laboratories, three Department of Energy synchrotron user facilities, and the University of Washington has applied spectroscopic and computational analyses to a number of metal oxides, quantifying trends in metal oxo bonding for groups of metals across the periodic table.

268

Trending: Metal Oxo Bonds  

NLE Websites -- All DOE Office Websites (Extended Search)

Trending: Metal Oxo Bonds Print Trending: Metal Oxo Bonds Print Metal oxides are important for scientific and technical applications in a variety of disciplines, including materials science, chemistry, and biology. Highly covalent metal-oxygen multiple bonds (metal oxos) are the building blocks of metal oxides and have a bearing on the oxide's desirable chemical, magnetic, electronic, and thermal properties. The lack of a more sophisticated grasp of bonding in metal oxides constitutes a roadblock to innovation in a wide variety of important emergent technologies, including industrial catalysis, biomimetic transformations, and artificial photosynthesis. To address this problem, a research team from four national laboratories, three Department of Energy synchrotron user facilities, and the University of Washington has applied spectroscopic and computational analyses to a number of metal oxides, quantifying trends in metal oxo bonding for groups of metals across the periodic table.

269

Fabrication procedure effects on fatigue resistance of rib -to-deck welded joints of steel orthotropic bridge decks  

E-Print Network (OSTI)

International Orthotropic Bridge Conference (CD-ROM),fatigue evaluation of steel bridges. International Journalfor the Bronx-Whitestone Bridge rehabilitation. Journal of

Sim, Hyoung-Bo

2010-01-01T23:59:59.000Z

270

Thermal Shock Resistance (TSR) and Thermal Fatigue Resistance (TFR) of Refractory Materials. Evaluation Method Based on the Dynamic Elastic Modulus  

Science Journals Connector (OSTI)

The importance of the thermal shock resistance (TSR) of refractory material is discussed. Understanding the evolution of thermal ... undergo repeated thermal cycling. The thermal fatigue resistance (TFR) behavior...

Nicols M. Rendtorff; Esteban F. Aglietti

2014-01-01T23:59:59.000Z

271

The Effect of Muscle Fatigue of the Non-Paretic Limb on Postural Control of Stroke Patients .  

E-Print Network (OSTI)

??Since a significantly greater percentage of body weight is supported by the non-paretic limb following stroke, a greater amount of fatigue may be present during (more)

McEwen, Daniel W. D.

2011-01-01T23:59:59.000Z

272

Effect of Creep and Oxidation on Reduced Creep-Fatigue life of Ni-based Alloy 617 at 850 C  

SciTech Connect

Low cycle fatigue (LCF) and creep fatigue testing of Ni-based alloy 617 was carried out at 850 C. Compared with its LCF life, the material s creep fatigue life decreases to different extents depending on test conditions. To elucidate the microstructure-fatigue property relationship for alloy 617 and the effect of creep and oxidation on its fatigue life, systematic microstructural investigations were carried out using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electron backscatter diffraction (EBSD). In LCF tests, as the total strain range increased, deformations concentrated near high angle grain boundaries (HAGBs). The strain hold period in the creep fatigue tests introduced additional creep damage to the material, which revealed the detrimental effect of the strain hold time on the material fatigue life in two ways. First, the strain hold time enhanced the localized deformation near HAGBs, resulting in the promotion of intergranular cracking of alloy 617. Second, the strain hold time encouraged grain boundary sliding, which resulted in interior intergranular cracking of the material. Oxidation accelerated the initiation of intergranular cracking in alloy 617. In the crack propagation stage, if oxidation was promoted and the cyclic oxidation damage was greater than the fatigue damage, oxidation-assisted intergranular crack growth resulted in a significant reduction in the material s fatigue life.

Chen, Xiang [ORNL] [ORNL; Yang, Zhiqing [ORNL] [ORNL; Sokolov, Mikhail A [ORNL] [ORNL; ERDMAN III, DONALD L [ORNL] [ORNL; Mo, Kun [ORNL] [ORNL; Stubbins, James [ORNL] [ORNL

2014-01-01T23:59:59.000Z

273

DOE/MSU composite material fatigue database: Test methods, materials, and analysis  

SciTech Connect

This report presents a detailed analysis of the results from fatigue studies of wind turbine blade composite materials carried out at Montana State University (MSU) over the last seven years. It is intended to be used in conjunction with the DOE/MSU composite Materials Fatigue Database. The fatigue testing of composite materials requires the adaptation of standard test methods to the particular composite structure of concern. The stranded fabric E-glass reinforcement used by many blade manufacturers has required the development of several test modifications to obtain valid test data for materials with particular reinforcement details, over the required range of tensile and compressive loadings. Additionally, a novel testing approach to high frequency (100 Hz) testing for high cycle fatigue using minicoupons has been developed and validated. The database for standard coupon tests now includes over 4,100 data points for over 110 materials systems. The report analyzes the database for trends and transitions in static and fatigue behavior with various materials parameters. Parameters explored are reinforcement fabric architecture, fiber content, content of fibers oriented in the load direction, matrix material, and loading parameters (tension, compression, and reversed loading). Significant transitions from good fatigue resistance to poor fatigue resistance are evident in the range of materials currently used in many blades. A preliminary evaluation of knockdowns for selected structural details is also presented. The high frequency database provides a significant set of data for various loading conditions in the longitudinal and transverse directions of unidirectional composites out to 10{sup 8} cycles. The results are expressed in stress and strain based Goodman Diagrams suitable for design. A discussion is provided to guide the user of the database in its application to blade design.

Mandell, J.F.; Samborsky, D.D. [Montana State Univ., Bozeman, MT (United States). Dept. of Chemical Engineering

1997-12-01T23:59:59.000Z

274

Overscreening Diamagnetism in Cylindrical Superconductor-Normal Metal-Heterostructures  

E-Print Network (OSTI)

. Bruder, and Yu.V. Nazarov Department of Physics, University of Konstanz, 78457 Konstanz, Germany Kavli Institute of NanoScience, Delft University of Technology, 2628 CJ Delft, The Netherlands We study to the proximity effect using the clean limit quasiclassical Eilenberger equations. We compare the results

Bruder, Christoph

275

Metal-Air Batteries  

SciTech Connect

Metal-air batteries have much higher specific energies than most currently available primary and rechargeable batteries. Recent advances in electrode materials and electrolytes, as well as new designs on metal-air batteries, have attracted intensive effort in recent years, especially in the development of lithium-air batteries. The general principle in metal-air batteries will be reviewed in this chapter. The materials, preparation methods, and performances of metal-air batteries will be discussed. Two main metal-air batteries, Zn-air and Li-air batteries will be discussed in detail. Other type of metal-air batteries will also be described.

Zhang, Jiguang; Bruce, Peter G.; Zhang, Gregory

2011-08-01T23:59:59.000Z

276

Application of measured loads to wind turbine fatigue and reliability analysis  

SciTech Connect

Cyclic loadings produce progressive damage that can ultimately result in wind turbine structural failure. There are many issues that must be dealt with in turning load measurements into estimates of component fatigue life. This paper deals with how the measured loads can be analyzed and processed to meet the needs of both fatigue life calculations and reliability estimates. It is recommended that moments of the distribution of rainflow-range load amplitudes be calculated and used to characterize the fatigue loading. These moments reflect successively more detailed physical characteristics of the loading (mean, spread, tail behavior). Moments can be calculated from data samples and functional forms can be fitted to wind conditions, such as wind speed and turbulence intensity, with standard recession techniques. Distributions of load amplitudes that accurately reflect the damaging potential of the loadings can be estimated from the moments at any, wind condition of interest. Fatigue life can then be calculated from the estimated load distributions, and the overall, long-term, or design spectrum can be generated for any particular wind-speed distribution. Characterizing the uncertainty in the distribution of cyclic loads is facilitated by using a small set of descriptive statistics for which uncertainties can be estimated. The effects of loading parameter uncertainty can then be transferred to the fatigue life estimate and compared with other uncertainties, such as material durability.

Veers, P.S. [Sandia National Labs., Albuquerque, NM (United States); Winterstein, S.R. [Stanford Univ., CA (United States)

1997-01-01T23:59:59.000Z

277

Novel Experiments to Characterize Creep-Fatigue Degradation in VHTR Alloys  

SciTech Connect

It is well known in energy systems that the creep lifetime of high temperature alloys is significantly degraded when a cyclic load is superimposed on components operating in the creep regime. A test method has been developed in an attempt to characterize creep-fatigue behavior of alloys at high temperature. The test imposes a hold time during the tensile phase of a fully reversed strain-controlled low cycle fatigue test. Stress relaxation occurs during the strain-controlled hold period. This type of fatigue stress relaxation test tends to emphasize the fatigue portion of the total damage and does not necessarily represent the behavior of a component in-service well. Several different approaches to laboratory testing of creep-fatigue at 950C have been investigated for Alloy 617, the primary candidate for application in VHTR heat exchangers. The potential for mode switching in a cyclic test from strain control to load control, to allow specimen extension by creep, has been investigated to further emphasize the creep damage. In addition, tests with a lower strain rate during loading have been conducted to examine the influence of creep damage occurring during loading. Very short constant strain hold time tests have also been conducted to examine the influence of the rapid stress relaxation that occurs at the beginning of strain holds.

J. K. Wright; J. A. Simpson; L. J. Carroll; R. N. Wright; T.-L. Sham

2013-10-01T23:59:59.000Z

278

Synthesis Of Fluorescent Metal Nanoclusters  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthesis Of Fluorescent Metal Nanoclusters Synthesis Of Fluorescent Metal Nanoclusters Fluorescent metal nanoclusters were prepared. Available for thumbnail of Feynman Center...

279

Metal phthalocyanine catalysts  

DOE Patents (OSTI)

As a new composition of matter, alkali metal or ammonium or tetraalkylammonium diazidoperfluorophthalocyanatoferrate. Other embodiments of the invention comprise compositions wherein the metal of the coordination complex is cobalt, manganese and chromium.

Ellis, Jr., Paul E. (Downingtown, PA); Lyons, James E. (Wallingford, PA)

1994-01-01T23:59:59.000Z

280

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

and Materials Analysis (CEMMA) Nanobiophysics Core (Dornsife) Department of Chemistry Instrumentation Facility (Dornsife) Photonics Center Cleanroom and Nanofabrication Facility...

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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

CONTACT INFORMATION The KAVLI NANOSCIENCE INSTITUTE  

E-Print Network (OSTI)

-user laboratories and cleanrooms for nanostructure synthesis, fabrication, and char- acterization are available

282

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

Organic alloys provide a new route for improved efficiency all-organic solar cells CEN Researcher Barry Thompson has demonstrated an alternative approach to broaden the absorption...

283

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

it all Stephen Bradforth USC Viterbi School of Engineering Microseminar Perspectives on Sustainability Michelle Povinelli K-12 and Community College Over the past 5 years, we...

284

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

rapidly gone from being laboratory based components to commercial products, with both cell phone and television displays being marketed today. The internal efficiencies of...

285

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

LED Nanowire LEDs GaN based light emitting diodes (LEDs) are a key technology for high brightness LEDs. Although already successful commercially, fundamental physical and device...

286

Antonya Sanders--Promoting nanoscience integration through  

E-Print Network (OSTI)

with no electricity, no running water and a constant rat problem. She had opportunities at home to make a difference education; but she soon realized there were ways besides teaching that would allow her to help the less's a small world: aiding global health and education Now married with two children, Sanders leads

287

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

Thompson, Barry C. ORIGIN OF THE TUNABLE OPEN CIRCUIT VOLTAGE IN TERNARY BLEND ORGANIC SOLAR CELLS J. Am. Chem Soc., 135, 986-989 (2013). DOI: 10.1021ja3112143 Burkhart, Beate;...

288

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

high energy photons are absorbed. This could result in a significant increase in solar cell efficiency. Device architectures with semiconductor nanowires both as light absorbing...

289

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

of Southern California, University of Illinois at Urbana - Champaign, University of Michigan, and University of Virginia. Learn all about CEN by viewing our video: CEN s...

290

RESEARCHARTICLE JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY  

E-Print Network (OSTI)

Engineering, and Center for Micro-Magnetic and Electronic Devices, University of Kentucky, Lexington, Kentucky successfully provided silicon substrates of anodic aluminum oxide (AAO) template with vertically oriented well, includ- ing chemical vapor deposition (CVD),7 arc discharge,8 and laser ablation.9 Regarding

Chen, Zhi

291

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

Leadership P. Daniel Dapkus Director, Principal Investigator University of Southern California dapkus at usc.edu Mark E. Thompson Associate Director, Co-Principal Investigator...

292

Multidisciplinary Cognitive Content of Nanoscience and Nanotechnology  

E-Print Network (OSTI)

This article examines the cognitive evolution and disciplinary diversity of nanotechnology as expressed through the terminology used in titles of nano journal articles. The analysis is based on the NanoBank bibliographic database of 287,106 nano articles published between 1981 and 2004. We perform multifaceted analyses of title words, focusing on 100 most frequent terms. Hierarchical clustering of title terms reveals three distinct time periods of cognitive development of nano research: formative (1981-1990), early (1991-1998), and current (after 1998). Early period is characterized by the introduction of thin film deposition techniques, while the current period is characterized by the increased focus on carbon nanotube and nanoparticle research. We introduce a method to identify disciplinary components of nanotechnology. It shows that the nano research is being carried out in a number of diverse parent disciplines. Currently only 5% of articles are published in dedicated nano-only journals. We find that some...

Milojevi?, Staa

2012-01-01T23:59:59.000Z

293

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

Members Click HERE for the complete Center Directory. Steve Bradforth bradfort at usc.edu USC Chemistry Steve Cronin scronin at usc.edu USC EE, Chemistry Richard Brutchey...

294

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

People Click HERE for the complete Center Directory. Center Leadership Center Advisory Board Members...

295

CENT Center for Energy Nanoscience and Technology  

E-Print Network (OSTI)

, solar cells from earth abundant materials, and nanowire based solar cells. Concentrator photovoltaics that has prevented nanowire solar cells (and other nanostructured solar cells) from demonstrating high and in this capacity is responsible for overseeing IBM's worldwide research strategy in the physical sciences. His

Southern California, University of

296

NEBRASKA CENTER FOR MATERIALS AND NANOSCIENCE  

E-Print Network (OSTI)

University--Carbondale Top-Down Approach to Fabricate Organic Dyes for Solar Cells The goal of our research in organic solar cells is to understand the electron excitation and transport processes of solar cell to produce cost-effective dyes for organic solar cells and discuss the preliminary results on the feasibility

Farritor, Shane

297

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

CEN r esearchers describe the motivation and advantages for using organic materials for solar photovoltaics and overview the challenges the center is taking on in improving their...

298

nanofabricaTion A Resource for Nanoscience  

E-Print Network (OSTI)

for waveguides · MEMS angle, force, and tactile sensors · MEMS gas analysis systems · Microfluidic systems

Blanchette, Robert A.

299

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

White Light Emitting Organic LEDs RHEED patterns for 400 of PTCDA grown on KBr at Tg -15C with a beam oriented approximately along the (b) 100 and (c) 110 directions of...

300

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

at the 2013 EFRC PI meeting CEN researchers achieve broadband light absorption into the near infrared Organic alloys provide a new route for improved efficiency all-organic solar...

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

CEN researchers achieve broadband light absorption into the near infrared Polymers that absorb beyond 800 nm have been reported, however, this has typically been at the expense of...

302

RESEARCHARTICLE JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY  

E-Print Network (OSTI)

-rays were in good agreement with transmission electron microscopy observations. Keywords: 1. INTRODUCTION different from those of coarse-grained materials.1 2 Several synthesis routes of nanocrystalline materials-ray diffraction line profiles are broadened due to the smallness of crystallites and the lattice distortions

Gubicza, Jenõ

303

Center for Energy Nanoscience at USC  

NLE Websites -- All DOE Office Websites (Extended Search)

Organic Photovoltaics The efficiencies of organic photovoltatic (OPV) cells have increased sharply over recent years, reaching 8%, or roughly half the efficiency of commercial...

304

FATIGUE AND FRACTURE BEHAVIOR OF HIGH TEMPERATURE MATERIALS  

E-Print Network (OSTI)

of damagetolerance in Ti3SiC,; (above the "ductile-brittle" transition temperature), where in fact, the plastic behavior in general is unusual for carbides and significant high-temperature deformation and damage are first is believed to be due to its layered structure and the metallic apparent. Of the two

Ritchie, Robert

305

MECS 2006- Fabricated Metals  

Energy.gov (U.S. Department of Energy (DOE))

Manufacturing Energy and Carbon Footprint for Fabricated Metals (NAICS 332) Sector with Total Energy Input, October 2012 (MECS 2006)

306

Stress intensity factors and fatigue growth of a surface crack in a drill pipe during rotary drilling operation  

E-Print Network (OSTI)

known that drill pipe fatigue in oil-gas drilling operations represents more than 30% of the drill pipeStress intensity factors and fatigue growth of a surface crack in a drill pipe during rotary drilling operation Ngoc Ha Daoa, , Hedi Sellamia aMines ParisTech, 35 rue Saint-Honoré, 77305 Fontainebleau

Paris-Sud XI, Université de

307

Materials Science and Engineering A231 (1997) 170182 Fatigue crack growth resistance in SiC particulate and whisker  

E-Print Network (OSTI)

Materials Science and Engineering A231 (1997) 170­182 Fatigue crack growth resistance in Si resulted in higher crack growth resistance at low growth rates in the particulate reinforced materials in these materials have indicated that many factors may be important in deter- mining the fatigue resistance of SiC/

Ritchie, Robert

308

Fatigue Life of Damaged Bridge Deck Panels Strengthened With Carbon Fiber Hongseob Oh, Jongsung Sim, and Christian Meyer  

E-Print Network (OSTI)

1 Fatigue Life of Damaged Bridge Deck Panels Strengthened With Carbon Fiber Sheets Hongseob Oh was applied to test panels, which were then reinforced with carbon fiber sheets (CFS) using two different for bridge decks, based on cumulative damage theory. Keywords: bridge deck slab, carbon fiber sheets, fatigue

Meyer, Christian

309

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

SciTech Connect

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

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

2006-10-01T23:59:59.000Z

310

Vuillerme and Boisgontier, Gait and Posture (2008) doi:10.1016/j.gaitpost.2008.03.005 MUSCLE FATIGUE DEGRADES FORCE SENSE AT THE ANKLE JOINT  

E-Print Network (OSTI)

FATIGUE DEGRADES FORCE SENSE AT THE ANKLE JOINT Nicolas VUILLERME and Matthieu BOISGONTIER Laboratoire of muscle fatigue on force sense at the ankle joint, ten young healthy adults were asked to perform an isometric contra-lateral force ankle-matching task in two experimental conditions of (1) No-fatigue and (2

Paris-Sud XI, Université de

311

Deposition of Contiguous Metal Adlayer on Transition Metal Nanostructu...  

NLE Websites -- All DOE Office Websites (Extended Search)

and Abstract Primary Lab Date Application 20100099012 Application 20100099012 Electrocatalyst Synthesized by Depositing a Contiguous Metal Adlayer on Transition Metal...

312

Residual stress profiles for mitigating fretting fatigue in gas turbine engine disks  

Science Journals Connector (OSTI)

The driving force for fretting fatigue in engine disks is the contact stresses generated by fretting of the blade and the disk surfaces in the attachment region. This paper examines the use of different residual compressive stress profiles to counteract the undesirable effects of contact stresses and to mitigate fretting fatigue. A global finite-element analysis of the disk blade assembly is first performed. The contact pressure and shear traction at the attachment region are extracted from the FEM results and used to compute the contact stress distribution. The contact stresses are then combined with the residual stresses and the bulk stresses. The overall stress distribution is then utilized in a probabilistic crack growth model to predict the risk of disk failure for a military engine under simulated loading conditions. The results are used to identify the minimum residual stress profile for mitigating fretting fatigue in engine disks.

Kwai S. Chan; Michael P. Enright; Jonathan P. Moody; Patrick J. Golden; Ramesh Chandra; Alan C. Pentz

2010-01-01T23:59:59.000Z

313

A simple method of estimating wind turbine blade fatigue at potential wind turbine sites  

SciTech Connect

This paper presents a technique of estimating blade fatigue damage at potential wind turbine sites. The cornerstone of this technique is a simple model for the blade`s root flap bending moment. The model requires as input a simple set of wind measurements which may be obtained as part of a routine site characterization study. By using the model to simulate a time series of the root flap bending moment, fatigue damage rates may be estimated. The technique is evaluated by comparing these estimates with damage estimates derived from actual bending moment data; the agreement between the two is quite good. The simple connection between wind measurements and fatigue provided by the model now allows one to readily discriminate between damaging and more benign wind environments.

Barnard, J.C.; Wendell, L.L.

1995-06-01T23:59:59.000Z

314

A systems science approach to fatigue management inresearch and health care  

Science Journals Connector (OSTI)

Abstract The purpose of this article was to highlight innovative analytic approaches in symptom science. Complex systems modeling is discussed using fatigue as an example. Fatigue is a common symptom among individuals of any age. It can be acute or chronic, and it can vary across the day and on weekends compared with weekdays. Fatigue can overlap with other symptoms, has many dimensions, and impacts daily function as well as society at large. With the complexities surrounding symptom science, innovative models are needed to advance our understanding of factors within the person, contextual and situational factors, and workplace or health care system factors that impact the symptom experience. Advances in methodologies, such as complex systems modeling, allow for more innovative methods to study the complexities of the symptom experience, design better ways to intervene and manage symptoms, and ultimately improve outcomes related to symptom management, quality of life, and health care utilization.

Kathryn A. Lee; Oliwier Dziadkowiec; Paula Meek

2014-01-01T23:59:59.000Z

315

Atmospheric and Wake Turbulence Impacts on Wind Turbine Fatigue Loading: Preprint  

SciTech Connect

Large-eddy simulations of atmospheric boundary layers under various stability and surface roughness conditions are performed to investigate the turbulence impact on wind turbines. In particular, the aeroelastic responses of the turbines are studied to characterize the fatigue loading of the turbulence present in the boundary layer and in the wake of the turbines. Two utility-scale 5 MW turbines that are separated by seven rotor diameters are placed in a 3 km by 3 km by 1 km domain. They are subjected to atmospheric turbulent boundary layer flow and data is collected on the structural response of the turbine components. The surface roughness was found to increase the fatigue loads while the atmospheric instability had a small influence. Furthermore, the downstream turbines yielded higher fatigue loads indicating that the turbulent wakes generated from the upstream turbines have significant impact.

Lee, S.; Churchfield, M.; Moriarty, P.; Jonkman, J.; Michalakes, J.

2011-12-01T23:59:59.000Z

316

A Review of Stress Corrosion Cracking/Fatigue Modeling for Light Water  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

A Review of Stress Corrosion Cracking/Fatigue Modeling for Light A Review of Stress Corrosion Cracking/Fatigue Modeling for Light Water Reactor Cooling System Components A Review of Stress Corrosion Cracking/Fatigue Modeling for Light Water Reactor Cooling System Components In the United States currently there are approximately 104 operating light water reactors. Of these, 69 are pressurized water reactors (PWRs) and 35 are boiling water reactors (BWRs). In 2007, the 104 light-water reactors (LWRs) in the United States generated approximately 100 GWe, equivalent to 20% of total US electricity production. Most of the US reactors were built before 1970 and the initial design lives of most of the reactors are 40 years. It is expected that by 2030, even those reactors that have received 20-year life extension license from the US Nuclear Regulatory Commission

317

Blade root attachment evaluation low-cycle fatigue estimates based on probabilistic approach  

SciTech Connect

When utilities purchase replacement blades from a manufacturer, the machining tolerances in the root attachment and the material fatigue properties are a major quality concern. These factors can have significant impact on the low-cycle fatigue life. For any replacement blades, the primary concern is to minimize the risk of an in-service failure. However, excessively conservative acceptance criteria would unnecessarily drive up the unit price for the replacement blades. Acceptance criteria with estimates of associated risks of in-service failure are therefore needed for each specific blade design based on the expected operating environment, material, and service life. In the work presented herein, a probabilistic model to estimate LCF in the blade root attachment is presented. The approach is demonstrated using stresses and material fatigue properties for a representative LP last stage blade of a steam turbine. The LCF life estimates obtained using the proposed approach show good correlation with field experience.

Sarlashkar, A.V.; Lam, T.C.T. [Stress Technology Inc., Rochester, NY (United States); McCloskey, T.H. [Electric Power Research Inst., Palo Alto, CA (United States)

1996-12-31T23:59:59.000Z

318

Plastic energy dissipation model for lifetime prediction of zirconium and zircaloy-4 fatigued at RT and 400 C  

SciTech Connect

Zirconium and zircaloy-4 are generally used as fuel tubes in pressurized heavy water reactors because of their low neutron absorption cross-section, excellent corrosion resistance, good strength and ductility. Low cycle fatigue properties of zirconium and zircaloy-4 were investigated at RT and 400 C. The microscopic structure was determined using scanning electron microscopy and transmission electron microscopy techniques. On the basis of analyses of fatigue damage mechanism, it is believed that fatigue is an irreversible energy dissipation process. Thus, the plastic dissipation energy per cycle is selected as a fatigue damage variable. The accumulated plastic dissipation energy is calculated at the condition of considering cyclic hardening, saturation and softening characters of zirconium and zircaloy-4 during cycling. The testing results show that they present a power law between the plastic dissipation energy and fatigue lifetime.

Lin, X.; Haicheng, G. [Xi`an Jiaotong Univ. (China). State Key Lab. for Mechanical Behavior of Materials

1998-04-01T23:59:59.000Z

319

An analysis of muscle fatigue due to complex tasks and its relation to the strain index  

E-Print Network (OSTI)

will be used to recover the EMG signal (Bilodeau et al, 2003; Blackwell et al, 1999; Mogk and Keir, 2003; Moritani et al, 1986a; Petrofsky, 1981; Radwin and Ruffalo, 1999; West et al, 1995). RMS amplitude is commonly used to characterize the EMG signal...? (West et al, 1995). Because of their effect on a subject?s perception of fatigue, these subjective factors need to be incorporated into fatigue studies. Localized discomfort surveys and ratings of perceived exertions (RPE) are two different types...

Stephens, John-Paul

2009-06-02T23:59:59.000Z

320

Effect of residual stress and surface roughness on the fatigue behaviour of aluminium matrix composites  

Science Journals Connector (OSTI)

In this investigation the fatigue properties of specimens manufactured with different turning parameters were investigated in stress-controlled constant amplitude tests at ambient temperature. The change of feed rate and depth of cut lead to a change in the near surface microstructure. Hence the fatigue properties were influenced significantly due to different surface roughness and surface residual stress resulting from the unequal turning processes. The cyclic deformation behaviour of AMC225xe is characterised by pronounced initial cyclic hardening. Continuous load increase tests allow a reliable estimation of the endurance limit of AMC225xe with one single specimen on the basis of cyclic deformation, temperature and electrical resistance data.

M Smaga; D Eifler

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Analysis of the effect of matrix degradation on fatigue behavior of a graphite/epoxy laminate  

E-Print Network (OSTI)

ANALYSIS OF THE EFFECT OF MATRIX DEGRADATION ON FATIGUE BEHAVIOR OF A GRAPHITE/EPOXY LAMINATE A Thesis by ROBERT THOMAS ARENBURG Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE May 1982 Major Subject: Civil Engineering ANALYSiS OF THE EFFECT OF MATRIX DEGRAOATION ON FATIGUE BEHAVIOR OF A GRAPHITE/EPOXY LAMINATE A Thesis by ROBERT THOMAS ARENBURG Approved as to style and content by: (Chairman...

Arenburg, Robert Thomas

2012-06-07T23:59:59.000Z

322

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

SciTech Connect

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

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

2003-12-19T23:59:59.000Z

323

Sensitivity of Solder Joint Fatigue to Sources of Variation in Advanced Vehicular Power Electronics Cooling  

SciTech Connect

This paper demonstrates a methodology for taking variation into account in thermal and fatigue analyses of the die attach for an inverter of an electric traction drive vehicle. This method can be used to understand how variation and mission profile affect parameters of interest in a design. Three parameters are varied to represent manufacturing, material, and loading variation: solder joint voiding, aluminum nitride substrate thermal conductivity, and heat generation at the integrated gate bipolar transistor. The influence of these parameters on temperature and solder fatigue life is presented. The heat generation loading variation shows the largest influence on the results for the assumptions used in this problem setup.

Vlahinos, A.; O'Keefe, M.

2010-06-01T23:59:59.000Z

324

One-Year Longitudinal Study of Fatigue, Cognitive Functions, and Quality of Life After Adjuvant Radiotherapy for Breast Cancer  

SciTech Connect

Purpose: Most patients with localized breast cancer (LBC) who take adjuvant chemotherapy (CT) complain of fatigue and a decrease in quality of life during or after radiotherapy (RT). The aim of this longitudinal study was to compare the impact of RT alone with that occurring after previous CT on quality of life. Methods and Materials: Fatigue (the main endpoint) and cognitive impairment were assessed in 161 CT-RT and 141 RT patients during RT and 1 year later. Fatigue was assessed with Functional Assessment of Cancer Therapy-General questionnaires, including breast and fatigue modules. Results: At baseline, 60% of the CT-RT patients expressed fatigue vs. 33% of the RT patients (p <0.001). Corresponding values at the end of RT were statistically similar (61% and 53%), and fatigue was still reported at 1 year by more than 40% of patients in both groups. Risk factors for long-term fatigue included depression (odds ratio [OR] = 6), which was less frequent in the RT group at baseline (16% vs. 28 %, respectively, p = 0.01) but reached a similar value at the end of RT (25% in both groups). Initial mild cognitive impairments were reported by RT (34 %) patients and CT-RT (24 %) patients and were persistent at 1 year for half of them. No biological disorders were associated with fatigue or cognitive impairment. Conclusions: Fatigue was the main symptom in LBC patients treated with RT, whether they received CT previously or not. The correlation of persistent fatigue with initial depressive status favors administering medical and psychological programs for LBC patients treated with CT and/or RT, to identify and manage this main quality-of-life-related symptom.

Noal, Sabine [Medical Oncology Department, Centre Francois Baclesse, Caen (France); Clinical Research Department, Centre Francois Baclesse, Caen (France); Levy, Christelle [Medical Oncology Department, Centre Francois Baclesse, Caen (France); Hardouin, Agnes [Department of Medical Biology, Centre Francois Baclesse, Caen (France); Rieux, Chantal [Clinical Research Department, Centre Francois Baclesse, Caen (France); Heutte, Natacha [Universite de Caen Basse Normandie GRECAN, Caen (France); Segura, Carine [Medical Oncology Department, Centre Francois Baclesse, Caen (France); Collet, Fabienne [Clinical Research Department, Centre Francois Baclesse, Caen (France); Allouache, Djelila; Switsers, Odile; Delcambre, Corinne; Delozier, Thierry [Medical Oncology Department, Centre Francois Baclesse, Caen (France); Henry-Amar, Michel [Clinical Research Department, Centre Francois Baclesse, Caen (France); Joly, Florence, E-mail: f.joly@baclesse.fr [Medical Oncology Department, Centre Francois Baclesse, Caen (France); Clinical Research Department, Centre Francois Baclesse, Caen (France); CHU, Cote de Nacre, Caen (France)

2011-11-01T23:59:59.000Z

325

Extraction process for removing metallic impurities from alkalide metals  

DOE Patents (OSTI)

A development is described for removing metallic impurities from alkali metals by employing an extraction process wherein the metallic impurities are extracted from a molten alkali metal into molten lithium metal due to the immiscibility of the alkali metals in lithium and the miscibility of the metallic contaminants or impurities in the lithium. The purified alkali metal may be readily separated from the contaminant-containing lithium metal by simple decanting due to the differences in densities and melting temperatures of the alkali metals as compared to lithium.

Royer, L.T.

1987-03-20T23:59:59.000Z

326

Sumitomo Metal Industries Ltd Sumitomo Metals | Open Energy Information  

Open Energy Info (EERE)

Sumitomo Metal Industries Ltd Sumitomo Metals Sumitomo Metal Industries Ltd Sumitomo Metals Jump to: navigation, search Name Sumitomo Metal Industries Ltd (Sumitomo Metals) Place Osaka-shi, Osaka, Japan Zip 540-0041 Sector Solar Product Engaged in the steel, engineering, and electronics businesses; works on fuel cell component technology and manufactures silicon wafers for the solar sector. References Sumitomo Metal Industries Ltd (Sumitomo Metals)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Sumitomo Metal Industries Ltd (Sumitomo Metals) is a company located in Osaka-shi, Osaka, Japan . References ↑ "Sumitomo Metal Industries Ltd (Sumitomo Metals)" Retrieved from "http://en.openei.org/w/index.php?title=Sumitomo_Metal_Industries_Ltd_Sumitomo_Metals&oldid=351744"

327

Stress dependent activation entropy for dynamic fatigue of pristine silica optical fibers  

E-Print Network (OSTI)

Subcritical crack growth in fused silica is treated as a stress assisted chemical reaction between water distilled water and pH 7 buffer solution, and the results are found to be similar. The fatigue parameters to the barrier height. The results show subcritical crack growth in high strength silica is dominated by entropy

Matthewson, M. John

328

Characterization and Modeling of Transformation Induced Fatigue of Shape Memory Alloy Actuators  

E-Print Network (OSTI)

to conduct repeatable and reliable fatigue testing. For this research, two materials are being investigated: TiNiCu and Ni-rich NiTi. The experiments performed on the first selected alloy, i.e. TiNiCu SMA, explore three major parameters: the applied stress...

Bertacchini, Olivier Walter

2011-02-22T23:59:59.000Z

329

Time-domain Fatigue Response and Reliability Analysis of Offshore Wind Turbines with  

E-Print Network (OSTI)

Time-domain Fatigue Response and Reliability Analysis of Offshore Wind Turbines with Emphasis of offshore wind turbines Defense: 09.12.2012 2012 - : Structural Engineer in Det Norske Veritas (DNV) 2007 of the drive train of an on-land wind turbine under dynamic wind loads. The main tasks of this study are to

Nørvåg, Kjetil

330

Effects of creatine loading on electromyographic fatigue threshold during cycle ergometry in college-aged women  

E-Print Network (OSTI)

The purpose of this study was to examine the effects of 5 days of Creatine (Cr) loading on the electromyographic fatigue threshold (EMGFT) in college-aged women. Fifteen healthy college-aged women (mean SD = 22.3 1.7 ...

Smith, Abbie E.; Walter, Ashley A.; Herda, Trent J.; Ryan, Eric D.; Moon, Jordan R.; Cramer, Joel T.; Stout, Jeffrey R.

2007-01-01T23:59:59.000Z

331

Influence of Impurity Segregation on Temper Embrittlement and on Slow Fatigue Crack  

E-Print Network (OSTI)

of segregated impurity atoms (temper embrittlement) and hydrogen atoms, evolved from crack tip surface reactions with water vapor in the moist air environment (hydrogen embrittlement). The signifi- cance of crack closureInfluence of Impurity Segregation on Temper Embrittlement and on Slow Fatigue Crack Growth

Ritchie, Robert

332

THERMAL FATIGUE AND FAILURE OF ELECTRONIC POWER DEVICE SUBSTRATES. S. Pietranico1&2  

E-Print Network (OSTI)

. For large thermal amplitudes, the failure occurs in DBC substrates, which are copper/ceramic in power modules, because of their good thermal conductivity. They are composed (Fig. 1) of a ceramic layer- 1 - THERMAL FATIGUE AND FAILURE OF ELECTRONIC POWER DEVICE SUBSTRATES. S. Pietranico1&2 , S

333

A systematic study of hcp crystal orientation and morphology effects in polycrystal deformation and fatigue  

Science Journals Connector (OSTI)

...components operating in gas turbines in both the aerospace...dwell on fatigue life in titanium alloys...hard grain sizes remaining significantly smaller...and 50mum, and all remaining grains of size 10mum...applications. J. Eng. Gas Turb. Power. 125...

2007-01-01T23:59:59.000Z

334

TRANSIENT FATIGUE-CRACK GROWTH BEHAVIOR FOLLOWING VARIABLE-AMPLITUDE LOADING IN A  

E-Print Network (OSTI)

TRANSIENT FATIGUE-CRACK GROWTH BEHAVIOR FOLLOWING VARIABLE-AMPLITUDE LOADING IN A MONOLITHIC-crack growth behavior following variable-amplitude loading sequences has been investigated in a hot-toughened ceramics [13] following various variable-amplitude loading sequences. Transient retardations, involving

Ritchie, Robert

335

Bond and low cycle fatigue behavior of thermoset composite reinforcing for the concrete industry  

SciTech Connect

This thesis encompasses two separate research projects. The first project, described in Chapter 2 was a project investigating the fatigue behavior of thermoset Fiber Composite (FC) sandwich wall ties. The second research project detailed in this thesis was a project studying the bond and tensile properties of FC rod and FC fibers.

Barnes, B.

1990-09-21T23:59:59.000Z

336

FATIGUE BEHAVIOR OF PRESTRESSED CONCRETE BRIDGE1 GIRDERS STRENGTHENED WITH VARIOUS CFRP SYSTEMS2  

E-Print Network (OSTI)

1 FATIGUE BEHAVIOR OF PRESTRESSED CONCRETE BRIDGE1 GIRDERS STRENGTHENED WITH VARIOUS CFRP SYSTEMS2 Owen A. Rosenboom, Sami H. Rizkalla3 4 5 6 Synopsis:7 8 Carbon Fiber Reinforced Polymer (CFRP) materials provide a solution for the classical9 challenge facing bridge maintenance engineers: the upgrading

337

Delamination and Failure at Ply Drops in Carbon Fiber Laminates Under Static and Fatigue Loading  

E-Print Network (OSTI)

Delamination and Failure at Ply Drops in Carbon Fiber Laminates Under Static and Fatigue Loading in composites with thickness tapering has been a major concern in aerospace applications of carbon fibers, where carbon fiber and glass fiber prepreg laminates containing various ply drop geometries, and using thicker

338

Notch sensitivity of fatigue life in a Sylramic TM composite at elevated temperature  

E-Print Network (OSTI)

sensitivity; Fatigue; SiC composite; Embrittlement 1. Introduction Continuous-fiber ceramic composites (CFCCs in advanced gas turbine engines. The motivation for this activity is the desire to increase operating are expelled during unloading and the oxidizing atmosphere drawn into the composite through matrix cracks

Zok, Frank

339

Effect of in situ material properties on fatigue damage modes in titanium matrix composites  

SciTech Connect

Titanium matrix composites (TMC) and their behavior under mechanical fatigue loads was the subject of this research. The primary objective was to explain fatigue damage modes in center-notched TMC specimens. Two modes of damage have been observed in continuously reinforced, zero-degree unidirectional, SCS-6/Ti-15V-3Cr-3Al-3Sn (SCS-6/Ti-15-3) laminates. The fatigue specimens were destructively analyzed using optical microscopy to determine where cracks originated and how they grew throughout the specimen. A micromechanical model was developed to explain the fatigue crack patterns observed in the interface region surrounding the fibers of the woven and acrylic-binder TMC material systems. A two-dimensional (2-D) model of a longitudinal lamina with a center hole was used to obtain a set of displacement boundary conditions for an element near the notch, yet within the net section where the spiral crack patterns were observed. These boundary conditions were then used on a three-dimensional (3-D) unit cell model of the fiber, matrix, and interface.

Harmon, D. [Boeing Co., St. Louis, MO (United States); Jerina, K.L. [Washington Univ., St. Louis, MO (United States). Materials Science and Engineering Program

1999-02-01T23:59:59.000Z

340

2009 ASME WIND ENERGY SYMPOSIUM Static and Fatigue Testing of Thick Adhesive Joints for  

E-Print Network (OSTI)

1 2009 ASME WIND ENERGY SYMPOSIUM Static and Fatigue Testing of Thick Adhesive Joints for Wind as wind blade size has increased. Typical blade joints use paste adhesives several millimeters thick aircraft, which are also of relevance to wind blades in many instances. The strengths of lap-shear and many

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

A REVIEW AND EVALUATION OF EMERGING DRIVER FATIGUE DETECTION MEASURES AND TECHNOLOGIES  

E-Print Network (OSTI)

- 1 - A REVIEW AND EVALUATION OF EMERGING DRIVER FATIGUE DETECTION MEASURES AND TECHNOLOGIES Lawrence Barr1 , Heidi Howarth1 , Stephen Popkin1 , Robert J. Carroll2 1 John A. Volpe National times, rest periods, recovery opportunities, and response to customer needs can vary widely. In addition

342

DEATH BY SMALL FORCES: FAILURE BY FATIGUE IN WAVE-SWEPT MACROALGAE  

E-Print Network (OSTI)

on substratum type and location. Rocky shores in particular have served as model systems for ecological studies environment of rocky shores has been evaluated through structural, cellular, and molecular analyses mechanics and fatigue analysis, I found that cracks introduced into flat-bladed macroalgae grow in length

Denny, Mark

343

TEMPORAL INFORMATION OF LINEAR AND NONLINEAR LAMB WAVES FOR FATIGUE DAMAGE LOCALIZATION: ANALYSIS AND SYNTHESIS  

E-Print Network (OSTI)

TEMPORAL INFORMATION OF LINEAR AND NONLINEAR LAMB WAVES FOR FATIGUE DAMAGE LOCALIZATION: ANALYSIS AND SYNTHESIS Ming Hong1,2 , Zhongqing Su*1,3 , Ye Lu2 , Li Cheng1,3 1 Department of Mechanical Engineering widely applied to locate gross damage in plate structures, which may greatly facilitate the localization

Boyer, Edmond

344

Apparent activation energy of fused silica optical fibers in static fatigue in aqueous environments  

E-Print Network (OSTI)

to occur when ambient moisture reacts with the fiber surface causing subcritical crack growth.1?3 Fatigue of silica optical fiber is therefore controlled by the crack growth rate, c : , which depends for the crack growth, which was originally proposed by Charles and Hillig, based on simple chemical kinetics

Matthewson, M. John

345

Fatigue threshold R-curves for predicting reliability of ceramics under cyclic loading  

E-Print Network (OSTI)

these materials are typically susceptible to prema- ture failure by subcritical crack propagation owing growth resistance [11] for cracks shorter than the steady-state bridging-zone lengths. Such crack, grain-bridging ceramics, the crack-size dependence of the fatigue threshold during bridging zone

Ritchie, Robert

346

EFFECT OF VISCOUS GRAIN BRIDGING ON CYCLIC FATIGUE-CRACK GROWTH IN MONOLITHIC CERAMICS  

E-Print Network (OSTI)

, toughness, creep, and subcritical crack growth [1± 10]. Under quasi-static loading, subcritical crack growthEFFECT OF VISCOUS GRAIN BRIDGING ON CYCLIC FATIGUE-CRACK GROWTH IN MONOLITHIC CERAMICS AT ELEVATED allow for consistent crack-growth monitoring in these materials at high temperatures, and even

Ritchie, Robert

347

Photoactivated metal removal  

SciTech Connect

The authors propose the use of photochromic dyes as light activated switches to bind and release metal ions. This process, which can be driven by solar energy, can be used in environmental and industrial processes to remove metals from organic and aqueous solutions. Because the metals can be released from the ligands when irradiated with visible light, regeneration of the ligands and concentration of the metals may be easier than with conventional ion exchange resins. Thus, the process has the potential to be less expensive than currently used metal extraction techniques. In this paper, the authors report on their studies of the metal binding of spirogyran dyes and the hydrolytic stability of these dyes. They have prepared a number of spirogyrans and measured their binding constants for calcium and magnesium. They discuss the relationship of the structure of the dyes to their binding strengths. These studies are necessary towards determining the viability of this technique.

Nimlos, M.R.; Filley, J.; Ibrahim, M.A.; Watt, A.S.; Blake, D.M.

1999-07-01T23:59:59.000Z

348

Analysis of SNL/MSU/DOE fatigue database trends for wind turbine blade materials.  

SciTech Connect

This report presents an analysis of trends in fatigue results from the Montana State University program on the fatigue of composite materials for wind turbine blades for the period 2005-2009. Test data can be found in the SNL/MSU/DOE Fatigue of Composite Materials Database which is updated annually. This is the fifth report in this series, which summarizes progress of the overall program since its inception in 1989. The primary thrust of this program has been research and testing of a broad range of structural laminate materials of interest to blade structures. The report is focused on current types of infused and prepreg blade materials, either processed in-house or by industry partners. Trends in static and fatigue performance are analyzed for a range of materials, geometries and loading conditions. Materials include: sixteen resins of three general types, five epoxy based paste adhesives, fifteen reinforcing fabrics including three fiber types, three prepregs, many laminate lay-ups and process variations. Significant differences in static and fatigue performance and delamination resistance are quantified for particular materials and process conditions. When blades do fail, the likely cause is fatigue in the structural detail areas or at major flaws. The program is focused strongly on these issues in addition to standard laminates. Structural detail tests allow evaluation of various blade materials options in the context of more realistic representations of blade structure than do the standard test methods. Types of structural details addressed in this report include ply drops used in thickness tapering, and adhesive joints, each tested over a range of fatigue loading conditions. Ply drop studies were in two areas: (1) a combined experimental and finite element study of basic ply drop delamination parameters for glass and carbon prepreg laminates, and (2) the development of a complex structured resin-infused coupon including ply drops, for comparison studies of various resins, fabrics and pry drop thicknesses. Adhesive joint tests using typical blade adhesives included both generic testing of materials parameters using a notched-lap-shear test geometry developed in this study, and also a series of simulated blade web joint geometries fabricated by an industry partner.

Mandell, John F. (Montana State University, Bozeman, MT); Ashwill, Thomas D.; Wilson, Timothy J. (Montana State University, Bozeman, MT); Sears, Aaron T. (Montana State University, Bozeman, MT); Agastra, Pancasatya (Montana State University, Bozeman, MT); Laird, Daniel L.; Samborsky, Daniel D. (Montana State University, Bozeman, MT)

2010-12-01T23:59:59.000Z

349

Metal atomization spray nozzle  

DOE Patents (OSTI)

A spray nozzle for a magnetohydrodynamic atomization apparatus has a feed passage for molten metal and a pair of spray electrodes mounted in the feed passage. The electrodes, diverging surfaces which define a nozzle throat and diverge at an acute angle from the throat. Current passes through molten metal when fed through the throat which creates the Lorentz force necessary to provide atomization of the molten metal. 6 figures.

Huxford, T.J.

1993-11-16T23:59:59.000Z

350

Fabricated Metals (2010 MECS)  

Energy.gov (U.S. Department of Energy (DOE))

Manufacturing Energy and Carbon Footprint for Fabricated Metals Sector (NAICS 332) Energy use data source: 2010 EIA MECS (with adjustments) Footprint Last Revised: February 2014

351

EMSL - trace metals  

NLE Websites -- All DOE Office Websites (Extended Search)

trace-metals en Microbial Reductive Transformation of Phyllosilicate Fe(III) and U(VI) in Fluvial Subsurface Sediments. http:www.emsl.pnl.govemslwebpublications...

352

Fatigue and Creep Crack Propagation behaviour of Alloy 617 in the Annealed and Aged Conditions  

SciTech Connect

The crack propagation behaviour of Alloy 617 was studied under various conditions. Elevated temperature fatigue and creep-fatigue crack growth experiments were conducted at 650 and 800 degrees C under constant stress intensity (triangle K) conditions and triangular or trapezoidal waveforms at various frequencies on as-received, aged, and carburized material. Environmental conditions included both laboratory air and characteristic VHTR impure helium. As-received Alloy 617 displayed an increase in the crack growth rate (da/dN) as the frequency was decreased in air which indicated a time-dependent contribution component in fatigue crack propagation. Material aged at 650C did not display any influence on the fatigue crack growth rates nor the increasing trend of crack growth rate with decreasing frequency even though significant microstructural evolution, including y (Ni3Al) after short times, occurred during aging. In contrast, carburized Alloy 617 showed an increase in crack growth rates at all frequencies tested compared to the material in the standard annealed condition. Crack growth studies under quasi-constant K (i.e. creep) conditions were also completed at 650 degrees C and a stress intensity of K = 40 MPa9 (square root)m. The results indicate that crack growth is primarily intergranular and increased creep crack growth rates exist in the impure helium environment when compared to the results in laboratory air. Furthermore, the propagation rates (da/dt) continually increased for the duration of the creep crack growth either due to material aging or evolution of a crack tip creep zone. Finally, fatigue crack propagation tests at 800 degrees C on annealed Alloy 617 indicated that crack propagation rates were higher in air than impure helium at the largest frequencies and lowest stress intensities. The rates in helium, however, eventually surpass the rates in air as the frequency is reduced and the stress intensity is decreased which was not observed at 650 degrees C.

Julian K. Benz; Richard N. Wright

2013-10-01T23:59:59.000Z

353

Silicon metal-semiconductor-metal photodetector  

DOE Patents (OSTI)

Silicon MSM photodiodes sensitive to radiation in the visible to near infrared spectral range are produced by altering the absorption characteristics of crystalline Si by ion implantation. The implantation produces a defected region below the surface of the silicon with the highest concentration of defects at its base which acts to reduce the contribution of charge carriers formed below the defected layer. The charge carriers generated by the radiation in the upper regions of the defected layer are very quickly collected between biased Schottky barrier electrodes which form a metal-semiconductor-metal structure for the photodiode.

Brueck, Steven R. J. (Albuquerque, NM); Myers, David R. (Albuquerque, NM); Sharma, Ashwani K. (Albuquerque, NM)

1997-01-01T23:59:59.000Z

354

Silicon metal-semiconductor-metal photodetector  

DOE Patents (OSTI)

Silicon MSM photodiodes sensitive to radiation in the visible to near infrared spectral range are produced by altering the absorption characteristics of crystalline Si by ion implantation. The implantation produces a defected region below the surface of the silicon with the highest concentration of defects at its base which acts to reduce the contribution of charge carriers formed below the defected layer. The charge carriers generated by the radiation in the upper regions of the defected layer are very quickly collected between biased Schottky barrier electrodes which form a metal-semiconductor-metal structure for the photodiode.

Brueck, Steven R. J. (Albuquerque, NM); Myers, David R. (Albuquerque, NM); Sharma, Ashwani K. (Albuquerque, NM)

1995-01-01T23:59:59.000Z

355

Symmetry reduction of metal phthalocyanines on metals  

Science Journals Connector (OSTI)

The temperature-dependent adsorption behavior of fourfold symmetric metal phthalocyanines (MPcs) on metals with commensurate and incommensurate symmetries was investigated by scanning tunneling microscopy. On the fourfold symmetric Cu(100) surface, planar and fourfold molecular structures in two equivalent orientations were found for MPcs when prepared at room temperature. In addition, two metastable orientations were identified when prepared at low temperature, which can be depopulated upon annealing. MPcs adsorbed on the sixfold symmetric Cu(111) surface showed a disturbed molecular appearance. The symmetry of molecular structures changed from fourfold to twofold, which is discussed in terms of molecule-substrate interaction.

Shih-Hsin Chang; Stefan Kuck; Jens Brede; Leonid Lichtenstein; Germar Hoffmann; Roland Wiesendanger

2008-12-29T23:59:59.000Z

356

Fatigue in martensitic 100Cr6: Relationship between rolling contact fatigue microstructural transitions and repetitive push testing  

E-Print Network (OSTI)

. They were firstly austenitised at 860 C for 30 minutes in an Ar tube 4 furnace and oil-quenched to 70 C. After 10 minutes in oil, the samples were tempered at 160 C for 15 minutes. The block was mechanically polished with silicon carbide papers, 6 m... from ?rss,max = 1 M pmax, where M is the Taylor factor equal to 2.9 for randomly oriented body- centred cubic metals [11]. Considering Fig. 4, ?rss,max can be considered to be equivalent to the maximum principal shear stress (?1,max). Then, pmax can...

Kang, Jee-Hyun; Rivera-Daz-del-Castillo, Pedro E. J.

2014-07-14T23:59:59.000Z

357

PHYTOEXTRACTION OF HEAVY METALS  

E-Print Network (OSTI)

) Type of phytoremediation Cost effective form of environmental remediation (Glass 1999) Chelating Agents: desorb heavy metals from soil matrix and form water-soluble metal complexes (Shen et al -using hyperaccumulator plant biomass to produce a bio-ore for commercial use -Li et al. look at using Ni

Blouin-Demers, Gabriel

358

Metallization of fluid hydrogen  

Science Journals Connector (OSTI)

...P. Tunstall Metallization of fluid hydrogen W. J. Nellis 1 A. A. Louis 2 N...The electrical resistivity of liquid hydrogen has been measured at the high dynamic...which structural changes are paramount. hydrogen|metallization of hydrogen|liquid...

1998-01-01T23:59:59.000Z

359

Electroreflectance in Metals  

Science Journals Connector (OSTI)

Calculations have been made which suggest that the prominent maximum in the electroreflectance spectra of metals observed by Feinleib is not due to modulation of the optical constants of the electrolyte, but to modulation of the optical constants of the metal.

Arnold Prostak and Wilford N. Hansen

1967-08-15T23:59:59.000Z

360

Production of magnesium metal  

SciTech Connect

A process of producing magnesium metal includes providing magnesium carbonate, and reacting the magnesium carbonate to produce a magnesium-containing compound and carbon dioxide. The magnesium-containing compound is reacted to produce magnesium metal. The carbon dioxide is used as a reactant in a second process. In another embodiment of the process, a magnesium silicate is reacted with a caustic material to produce magnesium hydroxide. The magnesium hydroxide is reacted with a source of carbon dioxide to produce magnesium carbonate. The magnesium carbonate is reacted to produce a magnesium-containing compound and carbon dioxide. The magnesium-containing compound is reacted to produce magnesium metal. The invention further relates to a process for production of magnesium metal or a magnesium compound where an external source of carbon dioxide is not used in any of the reactions of the process. The invention also relates to the magnesium metal produced by the processes described herein.

Blencoe, James G. (Harriman, TN) [Harriman, TN; Anovitz, Lawrence M. (Knoxville, TN) [Knoxville, TN; Palmer, Donald A. (Oliver Springs, TN) [Oliver Springs, TN; Beard, James S. (Martinsville, VA) [Martinsville, VA

2010-02-23T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Improving fatigue strength by producing residual stresses on surface of parts of gas-turbine engines using processing treatments  

Science Journals Connector (OSTI)

The paper deals with a comparison of results of measuring residual stresses and with the study of their ... effect on the fatigue strength of parts of gas-turbine engines after finish treatments by grinding, poli...

M. G. Yakovlev

2014-07-01T23:59:59.000Z

362

Fatigue failure in thin-film polycrystalline silicon is due to subcritical cracking within the oxide layer  

E-Print Network (OSTI)

Fatigue failure in thin-film polycrystalline silicon is due to subcritical cracking within with stress-induced surface oxide thicken- ing and moisture-assisted subcritical cracking in the amor- phous

Ritchie, Robert

363

Application of a Multi-Objective Approach and Sequential Covering Algorithm to the Fatigue Segment Classification Problem  

Science Journals Connector (OSTI)

In this paper, a multi-objective rule discovery approach is introduced to address the problem related to fatigue data editing. A set of rules are introduced to simplify the...very low, low and high...are chosen f...

Z. M. Nopiah; M. H. Osman; S. Abdullah

2014-03-01T23:59:59.000Z

364

Tongue-placed tactile biofeedback suppresses the deleterious effects of muscle fatigue on joint position sense at the ankle  

E-Print Network (OSTI)

Whereas the acuity of the position sense at the ankle can be disturbed by muscle fatigue, it recently also has been shown to be improved, under normal ankle neuromuscular state, through the use of an artificial tongue-placed tactile biofeedback. The underlying principle of this biofeedback consisted of supplying individuals with supplementary information about the position of their matching ankle position relative to their reference ankle position through electrotactile stimulation of the tongue. Within this context, the purpose of the present experiment was to investigate whether this biofeedback could mitigate the deleterious effect of muscle fatigue on joint position sense at the ankle. To address this objective, sixteen young healthy university students were asked to perform an active ankle-matching task in two conditions of No-fatigue and Fatigue of the ankle muscles and two conditions of No-biofeedback and Biofeedback. Measures of the overall accuracy and the variability of the positioning were determin...

Vuillerme, Nicolas; Chenu, Olivier; Demongeot, Jacques; Payan, Yohan

2007-01-01T23:59:59.000Z

365

The Thermal Fatigue Life Prediction of Diesel Engine Heating Components by the Strain-Range Partitioning Method  

Science Journals Connector (OSTI)

In this paper, first the loading condition of thermal load of marine diesel engine is analyzed, and then the stress-strain ... carried on the thermal fatigue life prediction of diesel engine heating components by...

Senior Engineer Gu Zetong; Hu Gan

1987-01-01T23:59:59.000Z

366

Contributions to an Improved Oxygen and Thermal Transport Model and Development of Fatigue Analysis Software for Asphalt Pavements  

E-Print Network (OSTI)

-rate binder oxidation and hardening kinetics and calibrated mechanistic approach with surface energy (CMSE) fatigue analysis algorithm from literature. Input data include reaction kinetics parameters, mixture test results, and pavement temperature. Carbonyl...

Jin, Xin

2012-02-14T23:59:59.000Z

367

Fatigue resistance of hot-mix asphalt concrete (HMAC) mixtures using the calibrated mechanistic with surface energy (CMSE) measurements approach  

E-Print Network (OSTI)

Fatigue cracking is one of the fundamental distresses that occur in the life of a Hot Mix Asphalt Concrete (HMAC) pavement. This load induced distress leads to structural collapse of the entire pavement ultimately and can only be remedied...

Ofori-Abebresse, Edward Kwame

2006-10-30T23:59:59.000Z

368

Metal-Nonmetal Transition in Metal-Ammonia Solutions  

Science Journals Connector (OSTI)

A review is given of the properties of metal-ammonia solutions together with a summary of the evidence for the existence of a metal-nonmetal transition.

J. C. THOMPSON

1968-10-01T23:59:59.000Z

369

Liquid metal electric pump  

DOE Patents (OSTI)

An electrical pump for pumping liquid metals to high pressures in high temperature environments without the use of magnets or moving mechanical parts. The pump employs a non-porous solid electrolyte membrane, typically ceramic, specific to the liquid metal to be pumped. A DC voltage is applied across the thickness of the membrane causing ions to form and enter the membrane on the electrically positive surface, with the ions being neutralized on the opposite surface. This action provides pumping of the liquid metal from one side of the non-porous solid electrolyte membrane to the other. 3 figs.

Abbin, J.P.; Andraka, C.E.; Lukens, L.L.; Moreno, J.B.

1992-01-14T23:59:59.000Z

370

Fatigue crack propagation in a quasi one-dimensional elasto-plastic model  

E-Print Network (OSTI)

Fatigue crack advance induced by the application of cyclic quasistatic loads is investigated both numerically and analytically using a lattice spring model. The system has a quasi-one-dimensional geometry, and consists in two symmetrical chains that are pulled apart, thus breaking springs which connect them, and producing the advance of a crack. Quasistatic crack advance occurs as a consequence of the plasticity included in the springs which form the chains, and that implies a history dependent stress-strain curve for each spring. The continuous limit of the model allows a detailed analytical treatment that gives physical insight of the propagation mechanism. This simple model captures key features that cause well known phenomenology in fatigue crack propagation, in particular a Paris-like law of crack advance under cyclic loading, and the overload retardation effect.

Toms M. Guozden; Eduardo A. Jagla

2012-06-27T23:59:59.000Z

371

Implementation of a Biaxial Resonant Fatigue Test Method on a Large Wind Turbine Blade  

SciTech Connect

A biaxial resonant test method was utilized to simultaneously fatigue test a wind turbine blade in the flap and edge (lead-lag) direction. Biaxial resonant blade fatigue testing is an accelerated life test method utilizing oscillating masses on the blade; each mass is independently oscillated at the respective flap and edge blade resonant frequency. The flap and edge resonant frequency were not controlled, nor were they constant for this demonstrated test method. This biaxial resonant test method presented surmountable challenges in test setup simulation, control and data processing. Biaxial resonant testing has the potential to complete test projects faster than single-axis testing. The load modulation during a biaxial resonant test may necessitate periodic load application above targets or higher applied test cycles.

Snowberg, D.; Dana, S.; Hughes, S.; Berling, P.

2014-09-01T23:59:59.000Z

372

Microstructurally based thermomechanical fatigue lifetime model of solder joints for electronic applications  

SciTech Connect

We present a new methodology for predicting the fatigue life of solder joints for electronics applications. This approach involves integration of experimental and computational techniques. The first stage involves correlating the manufacturing and processing parameters with the starting microstructure of the solder joint. The second stage involves a series of experiments that characterize the evolution of the microstructure during thermal cycling. The third stage consists of a computer modeling and simulation effort that utilizes the starting microstructure and experimental data to produce a reliability prediction of the solder joint. This approach is an improvement over current methodologies because it incorporates the microstructure and properties of the solder directly into the model and allows these properties to evolve as the microstructure changes during fatigue.

Frear, D.R.; Rashid, M.M.; Burchett, S.N.

1993-07-01T23:59:59.000Z

373

Approach to the fatigue analysis of vertical-axis wind-turbine blades  

SciTech Connect

A cursory analysis of the stress history of wind turbine blades indicates that a single stress level at each wind speed does not adequately describe the blade stress history. A statistical description is required. Blade stress data collected from the DOE/ALCOA Low Cost experimental turbines indicate that the Rayleigh probability density function adequately describes the distribution of vibratory stresses at each wind speed. The Rayleigh probability density function allows the distribution of vibratory stresses to be described by the RMS of the stress vs. time signal. With the RMS stress level described for all wind speeds, the complete stress history of the turbine blades is known. Miner's linear cumulative damage rule is used as a basis for summing the fatigue damage over all operating conditions. An analytical expression is derived to predict blade fatigue life.

Veers, P.S.

1981-09-01T23:59:59.000Z

374

Mean Stress and Environmental Effects on Fatigue in Type 304 Stainless Steel  

SciTech Connect

Fatigue life tests were performed in air on Type 304 stainless steel (304 SS) to establish the effect of mean stress under both load control and strain control. An apparent reduction of up to 26% in strain-amplitude occurred in the low and intermediate cycle regime (< 10{sup 8} cycles) for a mean stress of 138 Mpa. A quantitative description of mean stress effects using the Smith-Watson-Topper equivalent strain parameter was developed, which incorporates mean stress through the maximum stress. This description provided a tighter fit to the data, and allowed separation of mean stress and cold work effects. With this separation, the effect of mean stress was reduced to 12% decrease in strain amplitude at 138 Mpa. The stress-life curve apparently increased with increasing mean stress, due to the significant work hardening that occurred in tests with high mean stresses, especially under load control. Tests were performed on double-edge notched specimens of 304 SS in air and low oxygen water at 288 C. The elastically calculated increase in the notch tip stress accounted within 10% for the fatigue life reductions for a K{sub t} = 4.8 notch, but was 38% conservative for a K{sub t} = 8.8 notch. Fatigue crack initiation lives (defined as an 0.127 mm crack) in low oxygen water at 288 C were reduced by a factor of four to eight on cycles over those in air. Crack growth occurred throughout most of the fatigue ''initiation'' life. The increase in crack growth rate of 304 SS in water appears to be large enough to explain the reduced ''initiation'' life in this environment.

Kandra, J.T.; Leax, T.R.; Wire, G.L.

1999-04-01T23:59:59.000Z

375

Parametric calculations of fatigue-crack growth in piping. [PWR; BWR  

SciTech Connect

A major objective of this program is to provide data that can be used to formulate recommended revisions to ASME Section XI and regulatory requirements for inservice inspection of piping and pressure vessels. This study presents calculations of the growth of piping flaws produced by fatigue. Flaw growth was predicted as a function of the initial flaw size, the level and number of stress cycles, the piping material, and environmental factors.

Simonen, F.A.; Goodrich, C.W.

1983-03-01T23:59:59.000Z

376

Tensile creep of soil-cement and its relationship to fatigue  

E-Print Network (OSTI)

mechanics to cement and concrete. He reported from the literature review that the presence of water appeared to enhance subcritical crack growth and confirmed it experimentally [34]. In addition, it was noted that the fracture surface energy (estimated...&t , due to the large elastic compliance. The creep data were then used to predict the fatigue life of soil-cement utilizing Schapery's crack growth theory in linear viscoelastic media. Paris' law was adopted to express both the predicteo (from...

Kim, Youngsoo

2012-06-07T23:59:59.000Z

377

Divalent metal nanoparticles  

E-Print Network (OSTI)

Metal nanoparticles hold promise for many scientific and technological applications, such as chemical and biological sensors, vehicles for drug delivery, and subdiffraction limit waveguides. To fabricate such devices, a ...

DeVries, Gretchen Anne

2008-01-01T23:59:59.000Z

378

Nitrided Metallic Bipolar Plates  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

to meet 5000 h automotive durability goal at cost < 5kW Year 1 Goals: Single-cell fuel cell test performance for 25 cm 2 stamped and nitrided metallic bipolar plates...

379

Metal stocks and sustainability  

Science Journals Connector (OSTI)

...dissipated through corrosion and wear, and some enters waste repositories...landfills. Dissipation from wear and corrosion is generally small...dispersion of metals from wear and corrosion is an important...transportation (railroad, marine, aircraft, and aerospace equipment...

R. B. Gordon; M. Bertram; T. E. Graedel

2006-01-01T23:59:59.000Z

380

Oligocyclopentadienyl transition metal complexes  

SciTech Connect

Synthesis, characterization, and reactivity studies of oligocyclopentadienyl transition metal complexes, namely those of fulvalene, tercyclopentadienyl, quatercyclopentadienyl, and pentacyclopentadienyl(cyclopentadienyl) are the subject of this account. Thermal-, photo-, and redox chemistries of homo- and heteropolynuclear complexes are described.

de Azevedo, Cristina G.; Vollhardt, K. Peter C.

2002-01-18T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Excitons in Metals  

Science Journals Connector (OSTI)

It is shown that exciton states exist in metals, occurring near the interband threshold in optical absorption and substantially altering the shape and strength of the absorption edge. Their relation to the corresponding donor states is discussed.

G. D. Mahan

1967-03-20T23:59:59.000Z

382

Fatigue Reliability-based Inspection and Maintenance Planning of Gearbox Components in Wind Turbine Drivetrains  

Science Journals Connector (OSTI)

Abstract This paper introduces a reliability-based maintenance plan for wind turbine gearbox components. The gears and bearings are graded based on their fatigue damage and a maintenance map is developed to focus on those components with higher probability of fatigue failure and lower level of reliability. The main aim of this paper is to propose a method for developing the vulnerability map which can be used by maintenance teams to identify the components with lower reliabilities. The fatigue damage for gears and bearings are calculated at rated wind speed by the SN curve approach. The load duration distribution (LDD) method is used to obtain the stress range cycles for gears and load range cycles for bearings from the load and load effect time series obtained from a global response analysis. During routine inspection and maintenance, the vulnerability map can be used to find the faulty component by inspecting those with highest probability of failure rather than examining all gears and bearings. Such maps can be used for fault detection during routine maintenance and can reduce the down time and efforts of maintenance team to identify the source of problem. The proposed procedure is exemplified by a 750kW gearbox and a vulnerability map is developed for this case study gearbox.

Amir Rasekhi Nejad; Zhen Gao; Torgeir Moan

2014-01-01T23:59:59.000Z

383

A generalized fitting technique for the LIFE2 fatigue analysis code  

SciTech Connect

The analysis of component fatigue lifetime for a wind energy conversion system (WECS) requires that the component load spectrum be formulated in terms of stress cycles. Typically, these stress cycles are obtained from time series data using a cycle identification scheme. As discussed by many authors, the matrix or matrices of cycle counts that describe the stresses on a turbine are constructed from relatively short, representative samples of time series data. The ability to correctly represent the long-term behavior of the distribution of stress cycles from these representative samples is critical to the analysis of service lifetimes. Several techniques are currently used to convert representative samples to the lifetime cyclic loads on the turbine. There has been recently developed a set of fitting algorithms that is particularly useful for matching the body of the distribution of fatigue stress cycles on a turbine component. Fitting techniques are now incorporated into the LIFE2 fatigue/fracture analysis code for wind turbines. In this paper, the authors provide an overview of the fitting algorithms and describe the pre- and post-count algorithms developed to permit their use in the LIFE2 code. Typical case studies are used to illustrate the use of the technique.

Sutherland, H.J. [Sandia National Labs., Albuquerque, NM (United States). Wind Energy Research Dept.; Wilson, T. [Univ. of New Mexico, Albuquerque, NM (United States). New Mexico Engineering Research Inst.

1996-08-01T23:59:59.000Z

384

Nonlinear acoustics: A transition from laboratory to a practical fatigue assessment tool.  

Science Journals Connector (OSTI)

The ultrasonicsecond harmonic generation technique measuring the nonlinearity parameter has been developed and used in laboratories for several decades throughout the world. Many students and visiting scholars from numerous countries devoted their passions at the physical acoustics laboratories led by Dr. Mack Breazeale for 50 years. During that period of time nonlinear elastic properties of single crystals polycrystallinealloys superconductors ceramics and composites were measured. New measurement systems and techniques were also developed to understand temperature dependent linear and nonlinear elastic behaviors of these materials over a temperature range from the liquid helium to Curie temperatures of piezoelectricceramics. It took years of research and development efforts with a persistent funding before a practical fatigue damage measurement technique was finally developed. The transition from a rack full of equipment to a portable fatigue damage measurement system a continuous iteration process was inevitable. The current system specifically designed for steam turbine blades fatigue inspections consists of a probe fixture and an industrial grade lunch?box computer with custom designed signal processing cards.

Jeong?Kwan Na

2010-01-01T23:59:59.000Z

385

1000ton testing machine for cyclic fatigue tests of materials at liquid nitrogen temperatures  

SciTech Connect

One of the main tasks of superconductive magnets R and D is to determine the mechanical and fatigue properties of structural materials and the critical design elements in the cryogenic temperature range. This paper describes a new facility built based on the industrial 1000-ton (10 MN) testing machine Schenk PC10.0S. Special equipment was developed to provide the mechanical and cyclic tensile fatigue tests of large-scale samples at the liquid nitrogen temperature and in a given load range. The main feature of the developed testing machine is the cryostat, in which the device converting a standard compression force of the testing machine to the tensile force affected at the test object is placed. The control system provides the remote control of the test and obtaining, processing and presentation of test data. As an example of the testing machine operation the test program and test results of the cyclic tensile fatigue tests of fullscale helium inlet sample of the PF1 coil ITER are presented.

Khitruk, A. A.; Klimchenko, Yu. A.; Kovalchuk, O. A.; Marushin, E. L.; Mednikov, A. A.; Nasluzov, S. N.; Privalova, E. K.; Rodin, I. Yu.; Stepanov, D. B.; Sukhanova, M. V. [The D.V. Efremov Scientific Research Institute of Electrophysical Apparatus (NIIEFA), 3 Doroga na Metallostroy, Metallostroy, Saint Petersburg 196641 (Russian Federation)

2014-01-29T23:59:59.000Z

386

Monitoring Thermal Fatigue Damage In Nuclear Power Plant Materials Using Acoustic Emission  

SciTech Connect

Proactive aging management of nuclear power plant passive components requires technologies to enable monitoring and accurate quantification of material condition at early stages of degradation (i.e., pre-macrocrack). Acoustic emission (AE) is well-suited to continuous monitoring of component degradation and is proposed as a method to monitor degradation during accelerated thermal fatigue tests. A key consideration is the ability to separate degradation responses from external sources such as water spray induced during thermal fatigue testing. Water spray provides a significant background of acoustic signals, which can overwhelm AE signals caused by degradation. Analysis of AE signal frequency and energy is proposed in this work as a means for separating degradation signals from background sources. Encouraging results were obtained by applying both frequency and energy filters to preliminary data. The analysis of signals filtered using frequency and energy provides signatures exhibiting several characteristics that are consistent with degradation accumulation in materials. Future work is planned to enable verification of the efficacy of AE for thermal fatigue crack initiation detection. While the emphasis has been placed on the use of AE for crack initiation detection during accelerated aging tests, this work also has implications with respect to the use of AE as a primary tool for early degradation monitoring in nuclear power plant materials. The development of NDE tools for characterization of aging in materials can also benefit from the use of a technology such as AE which can continuously monitor and detect crack initiation during accelerated aging tests.

Meyer, Ryan M.; Ramuhalli, Pradeep; Watson, Bruce E.; Pitman, Stan G.; Roosendaal, Timothy J.; Bond, Leonard J.

2012-04-26T23:59:59.000Z

387

Wind turbine blade fatigue tests: lessons learned and application to SHM system development  

SciTech Connect

This paper presents experimental results of several structural health monitoring (SHM) methods applied to a 9-meter CX-100 wind turbine blade that underwent fatigue loading. The blade was instrumented with piezoelectric transducers, accelerometers, acoustic emission sensors, and foil strain gauges. It underwent harmonic excitation at its first natural frequency using a hydraulically actuated resonant excitation system. The blade was initially excited at 25% of its design load, and then with steadily increasing loads until it failed. Various data were collected between and during fatigue loading sessions. The data were measured over multiple frequency ranges using a variety of acquisition equipment, including off-the-shelf systems and specially designed hardware developed by the authors. Modal response, diffuse wave-field transfer functions, and ultrasonic guided wave methods were applied to assess the condition of the wind turbine blade. The piezoelectric sensors themselves were also monitored using a sensor diagnostics procedure. This paper summarizes experimental procedures and results, focusing particularly on fatigue crack detection, and concludes with considerations for implementing such damage identification systems, which will be used as a guideline for future SHM system development for operating wind turbine blades.

Taylor, Stuart G. [Los Alamos National Laboratory; Farinholt, Kevin M. [Los Alamos National Laboratory; Jeong, Hyomi [Chonbuk National University, Korea; Jang, JaeKyung [Chonbuk National University, Korea; Park, Gyu Hae [Los Alamos National Laboratory; Todd, Michael D. [Los Alamos National Laboratory; Farrar, Charles R. [Los Alamos National Laboratory; Ammerman, Curtt N. [Los Alamos National Laboratory

2012-06-28T23:59:59.000Z

388

Effect of hydrogen on the fatigue behavior of alloy 600 at cathodic potential  

SciTech Connect

The purpose of this study is to investigate the fatigue crack growth behavior of mill annealed Alloy 600 in 0.1M NaCl solution at cathodic potential ({minus}1,300m V{sub SCE}) as a function of load frequency and load ratio (R = P{sub min}/P{sub max}), and to study the possible hydrogen-assisted cracking mechanism during fatigue testing. The hydrogen effects on Alloy 600 occur in air saturated NaCl solution at 25 C with specified load mode which differs from the operating conditions of PWR steam generators. The FCG tests in this study are for the basic research of fatigue behavior of Alloy 600 in aqueous environment. The enhancement of the FCG rates of Alloy 600 in 0.1M NaCl solution at 25 C and {minus}1,300m V{sub SCE} is due to hydrogen embrittlement, and the phenomenon is more significant as load frequency decreases and load ratio increases.

Ho, J.T.; Yu, G.P. [National Tsing-Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Nuclear Engineering] [National Tsing-Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Nuclear Engineering

1995-06-01T23:59:59.000Z

389

Lithium metal reduction of plutonium oxide to produce plutonium metal  

DOE Patents (OSTI)

A method is described for the chemical reduction of plutonium oxides to plutonium metal by the use of pure lithium metal. Lithium metal is used to reduce plutonium oxide to alpha plutonium metal (alpha-Pu). The lithium oxide by-product is reclaimed by sublimation and converted to the chloride salt, and after electrolysis, is removed as lithium metal. Zinc may be used as a solvent metal to improve thermodynamics of the reduction reaction at lower temperatures. Lithium metal reduction enables plutonium oxide reduction without the production of huge quantities of CaO--CaCl.sub.2 residues normally produced in conventional direct oxide reduction processes.

Coops, Melvin S. (Livermore, CA)

1992-01-01T23:59:59.000Z

390

Metallic glass composition  

DOE Patents (OSTI)

A metallic glass alloy that is either iron-based or nickel-based or based on a mixture of iron and nickel, containing lesser amounts of elements selected from the group boron, silicon carbon and phosphorous to which is added an amount of a ductility enhancing element selected from the group cerium, lanthanum, praseodymium and neodymium sufficient to increase ductility of the metallic glass upon annealing.

Kroeger, Donald M. (Knoxville, TN); Koch, Carl C. (Raleigh, NC)

1986-01-01T23:59:59.000Z

391

Molten metal reactors  

DOE Patents (OSTI)

A molten metal reactor for converting a carbon material and steam into a gas comprising hydrogen, carbon monoxide, and carbon dioxide is disclosed. The reactor includes an interior crucible having a portion contained within an exterior crucible. The interior crucible includes an inlet and an outlet; the outlet leads to the exterior crucible and may comprise a diffuser. The exterior crucible may contain a molten alkaline metal compound. Contained between the exterior crucible and the interior crucible is at least one baffle.

Bingham, Dennis N; Klingler, Kerry M; Turner, Terry D; Wilding, Bruce M

2013-11-05T23:59:59.000Z

392

Functionalized Silicone Nanospheres: Synthesis, Transition Metal...  

NLE Websites -- All DOE Office Websites (Extended Search)

Functionalized Silicone Nanospheres: Synthesis, Transition Metal Immobilization, and Catalytic Applications. Functionalized Silicone Nanospheres: Synthesis, Transition Metal...

393

Evaluate the fracture and fatigue resistances of hot mix asphalt containing high percentage reclaimed asphalt pavement (RAP) materials at low and intermediate temperatures.  

E-Print Network (OSTI)

??When applying recycled asphalt technology in a flexible pavement project, most of the concerns are related to low-temperature fracture and fatigue cracking, since the stiffness (more)

Tang, Sheng

2014-01-01T23:59:59.000Z

394

PREDICTION OF LOW-CYCLE FATIGUE-LIFE BY ACOUSTIC EMISSION. PART 1: 2024-T3 ALUMINUM ALLOY PART 2: ALCLAD 7075-T6/ ALUMINUM ALLOY  

E-Print Network (OSTI)

low-cycle fatigue life of Aluminum sheet alloys by acoustictoughness of structural aluminum alloys. Fracture . Fracturetoughness of structural aluminum alloys, Eng. Fracture Mech.

Baram, J.

2013-01-01T23:59:59.000Z

395

A reaction-layer mechanism for the delayed failure of micron-scale polycrystalline silicon structural films subjected to high-cycle fatigue loading  

SciTech Connect

A study has been made of high-cycle fatigue in 2um thick structural films of n+- type, polycrystalline silicon for MEMS applications.

Muhlstein, C.L.; Stach, E.A.; Ritchie, R.O.

2001-11-01T23:59:59.000Z

396

Liquid metal thermal electric converter  

DOE Patents (OSTI)

A liquid metal thermal electric converter which converts heat energy to electrical energy. The design of the liquid metal thermal electric converter incorporates a unique configuration which directs the metal fluid pressure to the outside of the tube which results in the structural loads in the tube to be compressive. A liquid metal thermal electric converter refluxing boiler with series connection of tubes and a multiple cell liquid metal thermal electric converter are also provided.

Abbin, Joseph P. (Albuquerque, NM); Andraka, Charles E. (Albuquerque, NM); Lukens, Laurance L. (Albuquerque, NM); Moreno, James B. (Albuquerque, NM)

1989-01-01T23:59:59.000Z

397

High-Temperature Zirconia Oxygen Sensor with Sealed Metal/Metal...  

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

High-Temperature Zirconia Oxygen Sensor with Sealed MetalMetal Oxide Internal Reference High-Temperature Zirconia Oxygen Sensor with Sealed MetalMetal Oxide Internal Reference...

398

An experimental study on the effects of compressive stress on the fatigue crack growth of low-alloy steel  

SciTech Connect

A series of fatigue crack growth rate tests was conducted in order to study effects of negative stress ratio on fatigue crack growth rate of low-alloy steel in air. Four-point bend specimens were used to simulate linear stress distributions typical of pressure vessel applications. This type of testing adds to knowledge on negative stress ratio effects for low-alloy steels obtained in the past from uniform tension-compression tests. Applied bending stress range was varied over twice the yield strength. Load control was used for tests for which the stress range was less than twice the yield strength and deflection control was used for the higher stress range tests. Crack geometries were both short and long fatigue cracks started at notches and tight fatigue cracks for which crack closure could occur over the full crack face. Results are presented in terms of the stress intensity factor ratio R = K{sub MIN}/K{sub MAX}. The negative R-ratio test results were correlated to an equation of the form da/dN = C[{Delta}K/(A-R)]{sup n}, where A, C, and n are curve fitting parameters. It was found that effects of negative R-ratio on fatigue crack growth rates for even the high stress range tests could be bounded by correlating the above equation to only positive R-ratio test results and extending the resulting equation into the negative R-ratio regime.

Jones, D.P.; Hoppe, R.G. [Westinghouse Electric Corp., West Mifflin, PA (United States). Bettis Atomic Power Lab.; Hechmer, J.L. [Babcock and Wilcox Co., Barberton, OH (United States); James, B.A. [Colorado School of Mines, Golden, CO (United States). Dept. of Metallurgy

1993-12-01T23:59:59.000Z

399

Transition-Metal Hydrides  

NLE Websites -- All DOE Office Websites (Extended Search)

Transition-Metal Hydride Electrochromics Transition-Metal Hydride Electrochromics A new type of electrochromic hydride material has interesting and unusual properties. Thin Ni-Mg films, for example, are mirror-like in appearance and have very low visible transmittance. On exposure to hydrogen gas or on reduction in alkaline electrolyte, the films become transparent. The transition is believed to result from formation of nickel magnesium hydride, Mg2NiH4. Switchable mirrors based on rare earth hydrides were discovered in 1996 at Vrije University in the Netherlands, Rare earth-magnesium alloy films were subsequently found to be superior to the pure lanthanides in maximum transparency and mirror-state reflectivity by Philips Laboratories. The newer transition-metal types which use less expensive and less reactive materials were discovered at LBNL. This has now become a very active area of study with a network of researchers.

400

Hard metal composition  

DOE Patents (OSTI)

A composition of matter having a Rockwell A hardness of at least 85 is formed from a precursor mixture comprising between 3 and 10 wt % boron carbide and the remainder a metal mixture comprising from 70 to 90% tungsten or molybdenum, with the remainder of the metal mixture comprising nickel and iron or a mixture thereof. The composition has a relatively low density of between 7 and 14 g/cc. The precursor is preferably hot pressed to yield a composition having greater than 100% of theoretical density.

Sheinberg, H.

1983-07-26T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Hard metal composition  

DOE Patents (OSTI)

A composition of matter having a Rockwell A hardness of at least 85 is formed from a precursor mixture comprising between 3 and 10 weight percent boron carbide and the remainder a metal mixture comprising from 70 to 90 percent tungsten or molybdenum, with the remainder of the metal mixture comprising nickel and iron or a mixture thereof. The composition has a relatively low density of between 7 to 14 g/cc. The precursor is preferably hot pressed to yield a composition having greater than 100% of theoretical density.

Sheinberg, Haskell (Los Alamos, NM)

1986-01-01T23:59:59.000Z

402

Catalysis Without Precious Metals  

SciTech Connect

Written for chemists in industry and academia, this ready reference and handbook summarizes recent progress in the development of new catalysts that do not require precious metals. The research thus presented points the way to how new catalysts may ultimately supplant the use of precious metals in some types of reactions, while highlighting the remaining challenges. This material is based upon work supported as part of the Center for Molecular Electrocatalysis, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences.

Bullock, R. Morris

2010-11-01T23:59:59.000Z

403

Metal alloy identifier  

DOE Patents (OSTI)

To identify the composition of a metal alloy, sparks generated from the alloy are optically observed and spectrographically analyzed. The spectrographic data, in the form of a full-spectrum plot of intensity versus wavelength, provide the "signature" of the metal alloy. This signature can be compared with similar plots for alloys of known composition to establish the unknown composition by a positive match with a known alloy. An alternative method is to form intensity ratios for pairs of predetermined wavelengths within the observed spectrum and to then compare the values of such ratios with similar values for known alloy compositions, thereby to positively identify the unknown alloy composition.

Riley, William D. (Avondale, MD); Brown, Jr., Robert D. (Avondale, MD)

1987-01-01T23:59:59.000Z

404

Wick for metal vapor laser  

DOE Patents (OSTI)

An improved wick for a metal vapor laser is made of a refractory metal cylinder, preferably molybdenum or tungsten for a copper laser, which provides the wicking surface. Alternately, the inside surface of the ceramic laser tube can be metalized to form the wicking surface. Capillary action is enhanced by using wire screen, porous foam metal, or grooved surfaces. Graphite or carbon, in the form of chunks, strips, fibers or particles, is placed on the inside surface of the wick to reduce water, reduce metal oxides and form metal carbides.

Duncan, David B. (Livermore, CA)

1992-01-01T23:59:59.000Z

405

Structural Safety and Reliability, Corotis et al. (eds), 2001 Swets & Zeitlinger, ISBN 90 5809 197 X Moment-based fatigue load models for wind energy systems  

E-Print Network (OSTI)

197 X 1 Moment-based fatigue load models for wind energy systems Steven R. Winterstein & LeRoy M. Veers Sandia National Laboratories, Wind Energy Technology Department, Albuquerque, NM 87185-0708 Keywords: load models, fatigue loads, wind energy, non-Gaussian, moment-based models, long- term, short

Manuel, Lance

406

Mixed-mode, high-cycle fatigue-crack growth thresholds in I. A comparison of large-and short-crack behavior  

E-Print Network (OSTI)

) in a Ti±6Al±4V turbine blade alloy with a bimodal microstructure. Speci®cally, the eect of combined mode I machined to within $200 lm of the precrack tip. For such short cracks, wherein the magnitude of crack, particularly in association with fretting fatigue in the blade dovetail/disk contact section [3]. For fatigue

Ritchie, Robert

407

Thermal conductance of metal-metal interfaces  

Science Journals Connector (OSTI)

The thermal conductance of interfaces between Al and Cu is measured in the temperature range 78metal-dielectric interfaces. The magnitude and the linear temperature dependence of the conductance are described well by a diffuse-mismatch model for electron transport at interfaces.

Bryan C. Gundrum; David G. Cahill; Robert S. Averback

2005-12-30T23:59:59.000Z

408

Influence of temperature, environment, and thermal aging on the continuous cycle fatigue behavior of Hastelloy X and Inconel 617  

SciTech Connect

Results are presented for strain-controlled fatigue and tensile tests for two nickel-base, solution-hardened reference structural alloys for use in several High-Temperature Gas-Cooled Reactor (HTGR) concepts. These alloys, Hastelloy X and Inconel 617, were tested from room temperature to 871/sup 0/C in air and impure helium. Materials were tested in both the solution-annealed and the preaged conditios, in which aging consisted of isothermal exposure at one of several temperatures for periods of up to 20,000 h. Comparisons are given between the strain-controlled fatigue lives of these and several other commonly used alloys, all tested at 538/sup 0/C. An analysis is also presented of the continuous cycle fatigue data obtained from room temperature to 427/sup 0/C for Hastelloy G, Hastelloy X, Hastelloy C-276, and Hastelloy C-4, an effort undertaken in support of ASME code development.

Strizak, J.P.; Brinkman, C.R.; Booker, M.K.; Rittenhouse, P.L.

1982-04-01T23:59:59.000Z

409

Performance Demonstration Based Probablity of Detection (POD) Curves for Fatigue Cracks in Piping  

SciTech Connect

This paper evaluates non-destructive examination (NDE) detection capabilities for fatigue cracks in piping. Industry performance demonstration initiative (PDI) data for fatigue crack detection were used to develop a matrix of statistically based probability of detection (POD) curves that consider various NDE performance factors. Seven primary performance factors were identified Material, Crack Geometry/Type, NDE Examination Access, NDE Procedure, Examiner Qualification, Pipe Diameter, and Pipe Wall Thickness. A database of 16,181 NDE performance observations, with 18 fields associated with each observation, was created and used to develop statistically based POD curves for 42 stainless steel and 14 carbon steel performance cases. Subsequent comparisons of the POD fits for each of the cases showed that excellent NDE performance for fatigue cracks can be expected for ferritic materials. Very little difference was observed between the POD curves for the 14 carbon steel performance cases considered in this study and NDE performance could therefore be represented by a single POD curve. For stainless steel, very good performance can also be expected for circumferential cracks located on the same side of the weld from which the NDE examination is made. POD depended primarily on component thickness. Three POD curves for stainless steel were prepared. Best estimate and the associated 95% confidence bounds for POD versas through-wall depth logistic regression digital data are provided. Probabilistic fracture mechanics (PFM) calculations were performed to compare best estimate leak probabilities obtained from both the new performance-based POD curves and previous PFM models. This work was performed under joint funding by EPRI and the U.S. Department of Energy (DOE), Office of Nuclear Energy Science and Technologys Nuclear Energy Plant Optimization (NEPO) program.

Gosselin, Stephen R.; Simonen, Fredric A.; Heasler, Patrick G.; Becker, F. L.; Doctor, Steven R.; Carter, R. G.

2005-07-01T23:59:59.000Z

410

Moving to Metal  

Science Journals Connector (OSTI)

It is possible to 3D print in metal starting with a powder that...sintered...) by a laser or glued with a binder. As of this writing, this remains a very expensive process, and these are not desktop consumer prin...

Joan Horvath

2014-01-01T23:59:59.000Z

411

Mathematics in metal  

Science Journals Connector (OSTI)

...sculptures begin as a piece of computer code that dictates how the metal-printed parts fit together. Shes been using 3D printing for 15 years to forge her work and says the recent surge in popularity of the technology has opened up a few new opportunities...

Stephen Ornes

2013-01-01T23:59:59.000Z

412

Serpentine metal gasket  

DOE Patents (OSTI)

A metallic seal or gasket for use in the joining of cryogenic fluid conduits, the seal or gasket having a generally planar and serpentine periphery defining a central aperture. According to a preferred embodiment, the periphery has at least two opposing elongated serpentine sides and two opposing arcuate ends joining the opposing elongated serpentine sides and is of a hexagonal cross-section.

Rothgeb, Timothy Moore (Norfolk, VA); Reece, Charles Edwin (Yorktown, VA)

2009-06-02T23:59:59.000Z

413

Metal stocks and sustainability  

Science Journals Connector (OSTI)

...14). Unlike oil, which is irremediably...relative scarcity (or price) of the material substituted...interior wiring; plumbing, heating, and architectural uses; and...defined in terms of current prices and costs of production; this...cost-effective at current metal prices. Because the real price of copper has remained...

R. B. Gordon; M. Bertram; T. E. Graedel

2006-01-01T23:59:59.000Z

414

Pile on the metal  

Science Journals Connector (OSTI)

Discovering superconductivity above room temperature is a dream for modern science and technology. Now, theorists propose that for certain types of superconductors, contact with a metal layer could greatly increase the transition temperatures of these materialsin some cases by as much as an order of magnitude.

Dung-Hai Lee

2008-09-15T23:59:59.000Z

415

Photomagnetism of metals  

Science Journals Connector (OSTI)

A photoinduced magnetic moment has been observed in Cu and Al samples exposed to unpolarized visible light at low temperatures. It is shown that the light refected from a metal surface transfers some of its quasimomentum to conduction electrons. This mechanism creates surface currents which, for an appropriate geometry, bring about the photomagnetic effect.

V. L. Gurevich; R. Laiho; A. V. Lashkul

1992-07-06T23:59:59.000Z

416

Lithium Metal Anodes for Rechargeable Batteries. | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

Metal Anodes for Rechargeable Batteries. Lithium Metal Anodes for Rechargeable Batteries. Abstract: Rechargeable lithium metal batteries have much higher energy density than those...

417

Extensive Interstitial Solid Solutions of Metals in Metals  

Science Journals Connector (OSTI)

A new type of metallic solid solution has been prepared in which <~12.5 at.% of comparatively small metal atoms (Cu) fill interstitial sites in a host metal composed of larger atoms (Y). At higher solute concentrations, both interstitial and substitutional sites are occupied. These solid solutions are metastable; they were formed by ultrarapid quenching from the liquid.

B. C. Giessen; R. Ray; S. H. Hahn

1971-03-01T23:59:59.000Z

418

Purification of alkali metal nitrates  

DOE Patents (OSTI)

A process is disclosed for removing heavy metal contaminants from impure alkali metal nitrates containing them. The process comprises mixing the impure nitrates with sufficient water to form a concentrated aqueous solution of the impure nitrates, adjusting the pH of the resulting solution to within the range of between about 2 and about 7, adding sufficient reducing agent to react with heavy metal contaminants within said solution, adjusting the pH of the solution containing reducing agent to effect precipitation of heavy metal impurities and separating the solid impurities from the resulting purified aqueous solution of alkali metal nitrates. The resulting purified solution of alkali metal nitrates may be heated to evaporate water therefrom to produce purified molten alkali metal nitrate suitable for use as a heat transfer medium. If desired, the purified molten form may be granulated and cooled to form discrete solid particles of alkali metal nitrates.

Fiorucci, Louis C. (Hamden, CT); Gregory, Kevin M. (Woodridge, IL)

1985-05-14T23:59:59.000Z

419

Metal Aminoboranes - Energy Innovation Portal  

NLE Websites -- All DOE Office Websites (Extended Search)

of the formula M(NH.sub.2BH.sub.3).sub.n have been synthesized. Metal aminoboranes are hydrogen storage materials. Metal aminoboranes are also precursors for synthesizing other...

420

Metal-Ion-Mediated Reactions  

NLE Websites -- All DOE Office Websites (Extended Search)

Metal-Ion-Mediated Reactions Metal-Ion-Mediated Reactions Metal-Ion-Mediated Reactions Print Monday, 19 December 2011 18:29 While mononuclear, polynuclear, and polymeric metal complexes are most often synthesized by the reaction of a metal precursor and a presynthesized organic ligand, it is also possible to generate the ligand in situ from an easily available organic compound. This approach allows the reactivity of the metal ion to activate a proligand, transforming it through an in situ reaction, sometimes providing coordination compounds with ligands not accessible by conventional organic synthesis. The intense interest in the reactivity of coordinated ligands is mainly due to the necessity of interpreting the mechanisms of homogeneous metal-catalyzed processes, in which a substrate is activated upon its coordination to one or more metal sites. A coordinated oxime group contains three active sites (C, N, O) for reactivity.

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Case 31-2014 A 50-Year-Old Man with Back Pain, Fatigue, Weight Loss, and Knee Swelling  

Science Journals Connector (OSTI)

...and fatigue with exertion. He had a history of obesity, depression, gout, nephrolithiasis, an adrenal nodule, and elevated results of liver-function tests, as well as one episode of iritis of the left eye 15 years before admission. He had also undergone numerous orthopedic procedures after traumatic injuries... A 50-year-old man with fatigue, weight loss, joint pain, knee swelling, and chronic back pain was admitted to the hospital because of abnormal findings on magnetic resonance imaging of the spine. Diagnostic tests were performed.

Fisher M.C.Stone J.H.Palmer W.E.

2014-10-09T23:59:59.000Z

422

A high temperature fatigue life prediction computer code based on the total strain version of StrainRange Partitioning (SRP)  

SciTech Connect

A recently developed high-temperature fatigue life prediction computer code is presented and an example of its usage given. The code discussed is based on the Total Strain version of Strainrange Partitioning (TS-SRP). Included in this code are procedures for characterizing the creep-fatigue durability behavior of an alloy according to TS-SRP guidelines and predicting cyclic life for complex cycle types for both isothermal and thermomechanical conditions. A reasonably extensive materials properties database is included with the code.

Mcgaw, M.A.; Saltsman, J.F.

1993-10-01T23:59:59.000Z

423

Upgrading platform using alkali metals  

DOE Patents (OSTI)

A process for removing sulfur, nitrogen or metals from an oil feedstock (such as heavy oil, bitumen, shale oil, etc.) The method involves reacting the oil feedstock with an alkali metal and a radical capping substance. The alkali metal reacts with the metal, sulfur or nitrogen content to form one or more inorganic products and the radical capping substance reacts with the carbon and hydrogen content to form a hydrocarbon phase. The inorganic products may then be separated out from the hydrocarbon phase.

Gordon, John Howard

2014-09-09T23:59:59.000Z

424

Inert electrode containing metal oxides, copper and noble metal  

DOE Patents (OSTI)

A cermet composite material is made by treating at an elevated temperature a mixture comprising a compound of iron and a compound of at least one other metal, together with an alloy or mixture of copper and a noble metal. The alloy or mixture preferably comprises particles having an interior portion containing more copper than noble metal and an exterior portion containing more noble metal than copper. The noble metal is preferably silver. The cermet composite material preferably includes alloy phase portions and a ceramic phase portion. At least part of the ceramic phase portion preferably has a spinel structure.

Ray, Siba P. (Murrysville, PA); Woods, Robert W. (New Kensington, PA); Dawless, Robert K. (Monroeville, PA); Hosler, Robert B. (Sarver, PA)

2001-01-01T23:59:59.000Z

425

Inert electrode containing metal oxides, copper and noble metal  

DOE Patents (OSTI)

A cermet composite material is made by treating at an elevated temperature a mixture comprising a compound of iron and a compound of at least one other metal, together with an alloy or mixture of copper and a noble metal. The alloy or mixture preferably comprises particles having an interior portion containing more copper than noble metal and an exterior portion containing more noble metal than copper. The noble metal is preferably silver. The cermet composite material preferably includes alloy phase portions and a ceramic phase portion. At least part of the ceramic phase portion preferably has a spinel structure.

Ray, Siba P. (Murrysville, PA); Woods, Robert W. (New Kensington, PA); Dawless, Robert K. (Monroeville, PA); Hosler, Robert B. (Sarver, PA)

2000-01-01T23:59:59.000Z

426

Integrated decontamination process for metals  

DOE Patents (OSTI)

An integrated process for decontamination of metals, particularly metals that are used in the nuclear energy industry contaminated with radioactive material. The process combines the processes of electrorefining and melt refining to purify metals that can be decontaminated using either electrorefining or melt refining processes.

Snyder, Thomas S. (Oakmont, PA); Whitlow, Graham A. (Murrysville, PA)

1991-01-01T23:59:59.000Z

427

Metal-binding polymesr as chelating agents  

E-Print Network (OSTI)

Abstract Metal chelating polymers are functional polymers that bear specified chemical groups capable of selectively binding metals. Heavy metal contamination is considered a serious problem because these metals, even at ...

Mohammadi, Zahra

2011-04-11T23:59:59.000Z

428

Fatigue life evaluation of wire bonds in LED packages using numerical analysis  

Science Journals Connector (OSTI)

Abstract Reliability of LED packages is evaluated using several tests. When a thermal shock test, which is one of the reliability tests, is conducted, the most common failure mode is wire neck breakage. In order to evaluate the wire bonding reliability of LED packages, performing the thermal shock test is time-consuming. In this paper the wire bonding reliability for LED packages is evaluated by using numerical analysis. A wire bonding lifetime model for the thermal shock test was developed, which is based on Coffin-Manson fatigue law. The model was calibrated from fatigue data of thermal shock tests and volume averaging accumulated plastic strains. The accumulated plastic strains were calculated by using finite element analysis corresponding to the test conditions. The test conditions were changed by silicones, package sizes, wire bonding diameters, heights, and lengths. The calibrated model was used to estimate the number cycle to failure so that the wire bonding reliability for the thermal shock test was evaluated by performing the numerical analysis. Furthermore, we used a response surface methodology to study the relationship between the wire loop and the accumulated plastic strain to determine the optimal wire loop. The plastic strain was a function of diameter, height and length. At the optimal point, the number of cycle to failure for the thermal shock test was suggested using the wire bonding lifetime model.

Sung-Uk Zhang; Bang Weon Lee

2014-01-01T23:59:59.000Z

429

Thermal shock and fatigue resistance of tungsten materials under transient heat loading  

Science Journals Connector (OSTI)

Abstract Transient heat loading tests were performed on rolled pure tungsten (PW) and lanthanum oxide doped tungsten (WL10) as well as swaged+rolled potassium doped tungsten (W-K) samples using an electron beam. In thermal shock tests, the cracking threshold was 0.440.66, 0.170.22 and 0.440.66GW/m2 for PW, WL10 and W-K, respectively. The melting threshold was over 1.1GW/m2 for PW and W-K while 0.660.88GW/m2 for WL10. In thermal fatigue tests, the obvious roughening threshold was over 1000 cycles for PW and WL10 while 1100cycles for W-K. The cracking threshold was 1001000cycles for PW, 1100cycles for WL10 and over 1000cycles for W-K alloy. WL10 displayed worse thermal and fatigue resistance while W-K exhibited better properties compared with PW, which was attributed to differences in thermalmechanical properties of the three tungsten alloys, in addition to the size and number density of La2O3 particles and potassium bubbles.

Xiaoxin Zhang; Qingzhi Yan; Shaoting Lang; Min Xia; Xiang Liu; Changchun Ge

2014-01-01T23:59:59.000Z

430

Fatigue, fracture, and plastic collapse of offshore tubular joints using BSI PD 6493:1991  

SciTech Connect

The second version of the BSI Document PD 6493, on the assessment of the significance of weld defects on a fitness for purpose basis, was published in 1991. To extend the application of PD 6493 to offshore structures, a major program of research was carried out at a number of UK universities under the title of ``the Defect Assessment Programme`` sponsored by SERC/MTD Ltd. and a number of industrial companies. The program, carried out in the period 1985--1991, provided a specific methodology for the assessment of defects in tubular joints and detailed guidance on the evaluation of parameters required for fatigue and fracture assessments. The methodology includes a combined equation approach to Stress Intensity Factor (SIF) determination based on detailed knowledge of the local and global stress fields, an approach for estimation of the plastic collapse load of cracked tubular joints based on analytical and experimental studies, guidance on treatments of welding residual stresses, and data for application of the partial safety factor approach intended to enable rational treatments of uncertainties in input parameters for fracture assessment. This paper outlines key aspects of the fatigue and fracture procedures, and presents parametric equations required for application of the methodology relating to weld toe effects, degree of bending, and plastic collapse.

Cheaitani, M.J. [Billington Osborne-Moss Engineering Ltd., Maidenhead (United Kingdom); Thurlbeck, S.D. [EQE International Ltd., Warrington (United Kingdom); Burdekin, F.M. [UMIST, Manchester (United Kingdom). Dept. of Civil and Structural Engineering

1995-12-31T23:59:59.000Z

431

Matrix fatigue cracking mechanisms of alpha(2) TMC for hypersonic applications  

SciTech Connect

The objective of this work was to understand matrix cracking mechanisms in a unidirectional alpha[sub 2] TMC in possible hypersonic applications. A (0)[sub 8] SCS-6/Ti-24Al-11Nb (at. percent) TMC was first subjected to a variety of simple isothermal and nonisothermal fatigue cycles to evaluate the damage mechanisms in simple conditions. A modified ascent mission cycle test was then performed to evaluate the combined effects of loading modes. This cycle mixes mechanical cycling at 150 and 483 C, sustained loads, and a slow thermal cycle to 815 C. At low cyclic stresses and strains more common in hypersonic applications, environment-assisted surface cracking limited fatigue resistance. This damage mechanism was most acute for out-of-phase nonisothermal cycles having extended cycle periods and the ascent mission cycle. A simple linear fraction damage model was employed to help understand this damage mechanism. Time-dependent environmental damage was found to strongly influence out-of-phase and mission life, with mechanical cycling damage due to the combination of external loading and CTE mismatch stresses playing a smaller role. The mechanical cycling and sustained loads in the mission cycle also had a smaller role.

Gabb, T.P.; Gayda, J.

1994-02-01T23:59:59.000Z

432

Matrix fatigue cracking in {alpha}{sub 2} titanium matrix composites for hypersonic applications  

SciTech Connect

The objective of this work was to understand matrix cracking mechanisms in a unidirectional {alpha}{sub 2} titanium matrix composite (TMC) in possible hypersonic applications. A [0]{sub 8} SCS-6/Ti-24Al-11Nb (atomic %) TMC was first subjected to a variety of simple isothermal and nonisothermal fatigue cycles to evaluate the damage mechanisms in simple conditions. A modified ascent mission cycle test was then performed to evaluate the combined effects of loading modes. This cycle mixes mechanical cycling at 150 and 483 C, sustained loads, and a slow thermal cycle to 815 C. At low cyclic stresses and strains more common in hypersonic applications, environment-assisted surface cracking limited fatigue resistance. This damage mechanism was most acute for out-of-phase nonisothermal cycles having extended cycle periods and the ascent mission cycle. A simple linear fraction damage model was employed to help understand this damage mechanism. Time-dependent environmental damage was found to strongly influence out-of-phase and mission life, with mechanical cycling damage due to the combination of external loading and CTE mismatch stresses playing a smaller role. The mechanical cycling and sustained loads in the mission cycle also had a smaller role.

Gabb, T.P.; Gayda, J. [NASA Lewis Research Center, Cleveland, OH (United States)

1996-12-31T23:59:59.000Z

433

Effects of stress ratio and fiber orientation on fatigue crack growth behavior in APAL  

SciTech Connect

A new hybrid composite (APAL; Aramid Patched Aluminum Alloy), consisting of 2024-T3 aluminum alloy plate sandwiched between aramid/epoxy prepregs (HK 285/RS 1222), was developed. Fatigue crack growth behavior was examined at stress ratios of R = 0.2, 0.5 using two kinds of APAL with different fiber orientation (0{degree}/90{degree} and {+-} 45{degree} for crack direction). The APAL showed superior fatigue crack growth resistance, which may be attributed to the crack bridging effect imposed by the intact fibers in the crack wave. The magnitude of crack bridging was estimated quantitatively and determined by a new technique on the basis of the compliances of 2024-T3 aluminum alloy and APAL specimens. The crack growth rate of the APAL specimens was reduced significantly as comparison to the monolithic aluminum alloy and was not adequately correlated with the conventional stress intensity factor range ({Delta}K). It was found that the crack growth rate was successfully correlated with the effective stress intensity factor range ( {Delta}K{sub eff} = K{sub br} {minus} K{sub cl}) allowing for the crack closure and the crack bridging. The relation between da/dN and {Delta}K{sub eff} was plotted within a narrow scatter band regardless at loading line of 2024-T3 aluminum alloy, two kinds of the APAL (APAL 0{degree}/90{degree}, APAL {+-} 45{degree}) and two kinds of stress ratios (R = 0.2, 0.5).

Oh, S.W.; Park, W.J. [Dong-A Univ., Pusan (Korea, Republic of). Dept. of Mechanical Engineering; Yoon, H.K.; Lee, K.G. [Dong-Eui Univ., Pusan (Korea, Republic of). Dept. of Mechanical Engineering; Cho, J.M.; Lee, K.B. [Han Kuk Fiber Glass Co. Ltd., Kyungnam (Korea, Republic of)

1993-12-31T23:59:59.000Z

434

Improvement in surface fatigue life of hardened gears by high-intensity shot peening  

SciTech Connect

Two groups of carburized, hardened, and ground spur gears that were manufactured from the same heat vacuum induction melted vacuum arc melted (VIM VAR) AISI 9310 steel were endurance tested for surface fatigue. Both groups were manufactured with a standard ground 16 rms surface finish. One group was subjected to a shot peening (SP) intensity of 7 to 9A, and the second group was subjected to a SP intensity of 15 to 17A. All gears were honed after SP to a surface finish of 16 rms. The gear pitch diameter was 8.89 cm. Test conditions were a maximum Hertz stress of 1.71 GPa, a gear temperature of 350 K, and a speed of 10000 rpm. The lubricant used for the tests was a synthetic paraffinic oil with an additive package. The following results were obtained: The 10 pct. surface fatigue (pitting) life of the high intensity (15 to 17A) SPed gears was 2.15 times that of the medium intensity (7 to 9A) SPed gears, the same as that calculated from measured residual stress at a depth of 127 microns. The measured residual stress for the high intensity SPed gears was 57 pct. higher than that for the medium intensity SPed gears at a depth of 127 microns and 540 pct. higher at a depth of 51 microns.

Townsend, D.P.

1992-01-01T23:59:59.000Z

435

Observation of Metal-insulator and Metal-Metal Transitions in Hydrogen Iodide under Pressure  

Science Journals Connector (OSTI)

Hydrogen iodide has been studied up to pressures of 70 GPa at low temperatures in a diamondanvil cell. Electrical-conductivity and optical measurements have been used to observe pressure-induced phase transitions which are interpreted as follows: First a metal-insulator transition takes place in the molecular solid; with increased pressure a metal-metal molecular-to-atomic transition occurs. An additional transition due to intrinsic impurities has been observed. Implications for metallic hydrogen are discussed.

J. van Straaten and Isaac F. Silvera

1986-08-11T23:59:59.000Z

436

FLUIDIC: Metal Air Recharged  

SciTech Connect

Fluidic, with the help of ARPA-E funding, has developed and deployed the world's first proven high cycle life metal air battery. Metal air technology, often used in smaller scale devices like hearing aids, has the lowest cost per electron of any rechargeable battery storage in existence. Deploying these batteries for grid reliability is competitive with pumped hydro installations while having the advantages of a small footprint. Fluidic's battery technology allows utilities and other end users to store intermittent energy generated from solar and wind, as well as maintain reliable electrical delivery during power outages. The batteries are manufactured in the US and currently deployed to customers in emerging markets for cell tower reliability. As they continue to add customers, they've gained experience and real world data that will soon be leveraged for US grid reliability.

Friesen, Cody

2014-03-07T23:59:59.000Z

437

FLUIDIC: Metal Air Recharged  

ScienceCinema (OSTI)

Fluidic, with the help of ARPA-E funding, has developed and deployed the world's first proven high cycle life metal air battery. Metal air technology, often used in smaller scale devices like hearing aids, has the lowest cost per electron of any rechargeable battery storage in existence. Deploying these batteries for grid reliability is competitive with pumped hydro installations while having the advantages of a small footprint. Fluidic's battery technology allows utilities and other end users to store intermittent energy generated from solar and wind, as well as maintain reliable electrical delivery during power outages. The batteries are manufactured in the US and currently deployed to customers in emerging markets for cell tower reliability. As they continue to add customers, they've gained experience and real world data that will soon be leveraged for US grid reliability.

Friesen, Cody

2014-04-02T23:59:59.000Z

438

Apoferritin Templated Synthesis of Metal Phosphate Nanoparticle...  

NLE Websites -- All DOE Office Websites (Extended Search)

Apoferritin Templated Synthesis of Metal Phosphate Nanoparticle Labels for Electrochemical Immunoassay. Apoferritin Templated Synthesis of Metal Phosphate Nanoparticle Labels for...

439

THE COORDINATION CHEMISTRY OF METAL SURFACES  

E-Print Network (OSTI)

result 7 ' 30 u 31 in metal carbide cluster chemistry willin metal chemistry. Oxidation of the iron carbide cluster

Muetterties, Earl L.

2013-01-01T23:59:59.000Z

440

Hydrothermal alkali metal recovery process  

DOE Patents (OSTI)

In a coal gasification operation or similar conversion process carried out in the presence of an alkali metal-containing catalyst wherein solid particles containing alkali metal residues are produced, alkali metal constituents are recovered from the particles by treating them with a calcium or magnesium-containing compound in the presence of water at a temperature between about 250.degree. F. and about 700.degree. F. and in the presence of an added base to establish a pH during the treatment step that is higher than would otherwise be possible without the addition of the base. During the treating process the relatively high pH facilitates the conversion of water-insoluble alkali metal compounds in the alkali metal residues into water-soluble alkali metal constituents. The resultant aqueous solution containing water-soluble alkali metal constituents is then separated from the residue solids, which consist of the treated particles and any insoluble materials formed during the treatment step, and recycled to the gasification process where the alkali metal constituents serve as at least a portion of the alkali metal constituents which comprise the alkali metal-containing catalyst. Preferably, the base that is added during the treatment step is an alkali metal hydroxide obtained by water washing the residue solids produced during the treatment step.

Wolfs, Denise Y. (Houston, TX); Clavenna, Le Roy R. (Baytown, TX); Eakman, James M. (Houston, TX); Kalina, Theodore (Morris Plains, NJ)

1980-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Coated metal fiber coalescing cell  

SciTech Connect

A cell is described for coalescing oil droplets dispersed in a water emulsion including an elongated perforated tube core into which the emulsion is injected, layers of oleophilic plastic covered metal mat wound about the core through which the emulsion is forced to pass, the fibers of the metal mat being covered by oleophilic plastic such as vinyl, acrylic, polypropylene, polyethylene, polyvinyl chloride, the metal being in the form of layers of expanded metal or metal fibers, either aluminum or stainless steel. In manufacturing the cell a helix wound wire is formed around the cylindrical plastic coated metal to retain it in place and resist pressure drop of fluid flowing through the metal fibers. In addition, the preferred arrangement includes the use of an outer sleeve formed of a mat of fibrous material such as polyester fibers, acrylic fibers, modacrylic fibers and mixtures thereof.

Rutz, W.D.; Swain, R.J.

1980-12-23T23:59:59.000Z

442

Water supply and sludge metals  

SciTech Connect

Ultimate sludge disposal is one of the major tasks facing wastewater treatment facilities today. Where adequate farmland exists in proximity to the treatment facility and where sludge characteristics are suitable, land application is often the most economical method. In some cases, however, metal concentrations in the sludge either limit the site life or the application rate to the point where land application is not economical. When metals are above regulatory limits, land application may become impossible. The origin of the metals has largely been credited to industrial users and stormwater runoff and have, in fact, often represented significant sources of metals. Another potentially significant source of metals that has been frequently overlooked is the water supply system (including the distribution and home piping systems). Data from some treatment facilities suggest that the water supply system is the major source of metals and is the reason that sewage sludge metal levels are above allowable land application limits.

Brown, W.E. (Wright-Pierce Engineers, Topsham, ME (USA))

1988-04-01T23:59:59.000Z

443

Corrosion protective coating for metallic materials  

DOE Patents (OSTI)

Corrosion protective coatings for metallic materials, particularly aluminum and aluminum alloys, produced with simple, low-cost equipment and materials other than toxic metals or metal salts, or metal cyanides. The metallic material is cleaned, degreased, and deoxidized, the surface is converted to a substantially alkaline condition, and the surface is chemically sealed with inorganic metal compounds.

Buchheit, Rudolph G. (Albuquerque, NM); Martinez, Michael A. (Albuquerque, NM)

1998-01-01T23:59:59.000Z

444

Corrosion protective coating for metallic materials  

DOE Patents (OSTI)

Corrosion protective coatings for metallic materials, particularly aluminum and aluminum alloys, produced with simple, low-cost equipment and materials other than toxic metals or metal salts, or metal cyanides is disclosed. The metallic material is cleaned, degreased, and deoxidized, the surface is converted to a substantially alkaline condition, and the surface is chemically sealed with inorganic metal compounds. 1 fig.

Buchheit, R.G.; Martinez, M.A.

1998-05-26T23:59:59.000Z

445

TONGUE-PLACED TACTILE BIOFEEDBACK SUPPRESSES THE DELETERIOUS EFFECTS OF MUSCLE FATIGUE ON JOINT POSITION SENSE AT THE ANKLE  

E-Print Network (OSTI)

POSITION SENSE AT THE ANKLE Nicolas VUILLERME, Matthieu BOISGONTIER, Olivier CHENU, Jacques DEMONGEOT of the position sense at the ankle can be disturbed by muscle fatigue, it recently also has been shown to be improved, under normal ankle neuromuscular state, through the use of an artificial tongue-placed tactile

Paris-Sud XI, Université de

446

Micromechanisms of creep-fatigue crack growth in a silicide-matrix composite with SiC particles  

SciTech Connect

An experimental study has been conducted to examine the cyclic fatigue crack growth characteristics in 1,200 C air of a MoSi[sub 2]-50 mol% WSi[sub 2] alloy in the unreinforced condition and with 30 vol% SiC particles. For comparison purposes, crack growth experiments under sustained loads were also carried out in the silicide-matrix composite. Particular attention is devoted to developing an understanding of the micromechanism of subcritical crack growth by recourse to optical and electron microscopy, including transmission electron microscopy of crack-tip damage. The results indicate that enhanced viscous flow of glass films along interfaces and grain boundaries imparts pronounced levels of subcritical crack growth in the composite material; the composite exhibits a higher fatigue fracture threshold and a more extended range of stable fracture than the unreinforced alloy. The effects of glass phase in influencing fatigue crack growth in the silicide-based material are compared to the influence of in situ-formed and preexisting glass films on high-temperature cyclic fatigue crack growth in ceramics and ceramic composites. The paper concludes with a comparison of present results with the high-temperature damage tolerance of a variety of intermetallic alloys and ceramic materials.

Ramamurty, U.; Kim, A.S.; Suresh, S. (Brown Univ., Providence, RI (United States)); Petrovic, J.J. (Los Alamos National Lab., NM (United States))

1993-08-01T23:59:59.000Z

447

High-Frequency Fatigue Behavior of Woven-Fiber-Fabric-Reinforced Polymer-Derived Ceramic-Matrix Composites  

E-Print Network (OSTI)

heat exchangers, continuous-fiber-reinforced ceramic- matrix composites (CFCMCs) will encounter cyclic glass-matrix composite showed that, unlike monolithic ceramics, fatigue life of this composite decreased. The emphasis of processing research in the ceramic-matrix composite (CMC) area has increasingly shifted from

Barber, James R.

448

Fracture and Fatigue Behavior at Ambient and Elevated Temperatures of Alumina Bonded with Copper/Niobium/Copper Interlayers  

E-Print Network (OSTI)

Fracture and Fatigue Behavior at Ambient and Elevated Temperatures of Alumina Bonded with Copper and Engineering, University of California, Berkeley, California 94720 Interfacial fracture toughness and cyclic temperatures, and assessed in terms of interfacial chemistry and microstructure. The mean interfacial fracture

Ritchie, Robert

449

F A T I G U E 2 0 0 2 HIGH-CYCLE FATIGUE OF BETA TITANIUM ALLOYS  

E-Print Network (OSTI)

-object damage on jet engine fan blades is used as an engineering example of potential HCF applicationsF A T I G U E 2 0 0 2 HIGH-CYCLE FATIGUE OF BETA TITANIUM ALLOYS J. O. Peters*+ , G. Lütjering*, R) properties of the high-strength titanium alloys -Cez and Ti-6246 (in two distinctly different + processed

Ritchie, Robert

450

On the application of the KitagawaTakahashi diagram to foreign-object damage and high-cycle fatigue  

E-Print Network (OSTI)

with such HCF related failures in titanium alloy blades [1­4]. Specifically, FOD has been found to reduce the fatigue strength of fan and compressor blades, principally by causing stress-raising notches [5 for evaluating the detrimental effect of FOD on HCF failures in Ti­ 6Al­4V blade alloys. ? 2002 Elsevier Science

Hutchinson, John W.

451

Fatigue Characterization and Cyclic Plasticity Modeling of Magnesium Spot-Welds.  

E-Print Network (OSTI)

??The automotive industry is adopting lightweight materials to improve emissions and fuel economy. Magnesium (Mg) alloys are the lightest of engineering metals, but work is (more)

Behravesh, Seyed Behzad

2013-01-01T23:59:59.000Z

452

Ultrasonic Evaluation of Two Dissimilar Metal Weld Overlay Specimens  

SciTech Connect

Two dissimilar metal weld (DMW) pipe-to-nozzle specimens were implanted with thermal fatigue cracks in the 13% to 90% through-wall depth range. The specimens were ultrasonically evaluated with phased-array probes having center frequencies of 0.8, 1.0, 1.5, and 2.0 megahertz (MHz). An Alloy 82/182 weld overlay (WOL) was applied and the specimens were ultrasonically re-evaluated for flaw detection and characterization. The Post-WOL flaw depths were approximately 10% to 56% through-wall. This study has shown the effectiveness of ultrasonic examinations of Alloy 82/182 overlaid DMW specimens. Phased-array probes with center frequency in the 0.8- to 1.0-MHz range provide a strong coherent signal but the greater ultrasonic wavelength and larger beam spot size prevent the reliable detection of small flaws. These small flaws had nominal through-wall depths of less than 15% and length in the 50-60 mm (2-2.4 in.) range. Flaws in the 19% and greater through-wall depth range were readily detected with all four probes. At the higher frequencies, the reflected signals are less coherent but still provide adequate signal for flaw detection and characterization. A single inspection at 2.0 MHz could provide adequate detection and sizing information but a supplemental inspection at 1.0 or 1.5 MHz is recommended.

Crawford, Susan L.; Cinson, Anthony D.; Prowant, Matthew S.; Moran, Traci L.; Anderson, Michael T.

2012-06-30T23:59:59.000Z

453

Changes in stationary upright standing and proprioceptive reflex control of foot muscles after fatiguing static foot inversion  

Science Journals Connector (OSTI)

Abstract We searched for the consequences of a maximal static foot inversion sustained until exhaustion on the post-exercise stationary upright standing and the proprioceptive control of the foot muscles. Twelve healthy subjects executed an unilateral maximal static foot inversion during which continuous power spectrum analyses of surface electromyograms of the tibialis anterior (TA), peroneus longus (PL), and gastrocnemius medialis (GM) muscles were performed. Superimposed pulse trains (twitch interpolation) were delivered to the TA muscle to identify central or peripheral fatigue. Before and after the fatiguing task, we measured (1) the repartition of the plantar and barycentre surfaces with a computerized stationary platform, (2) the peak contractile TA response to electrical stimulation (TA twitch), (3) the tonic vibratory response (TVR) of TA and GM muscles, and (4) the Hoffman reflex. During static exercise, central fatigue was diagnosed in 5/12 subjects whereas in the 7 others peripheral TA fatigue was deduced from the absence of response to twitch interpolation and the post-exercise decrease in twitch amplitude. The sustained foot inversion was associated with reduced median frequency in TA but not in PL and GM muscles. After static exercise, in all subjects both the mean plantar and rearfoot surfaces increased, indicating a foot eversion, the TVR amplitude decreased in TA but did not vary in GM, and the Hoffman reflex remained unchanged. Whatever was the mechanism of fatigue during the maximal foot inversion task, the facilitating myotatic reflex was constantly altered in foot invertor muscles. This could explain the prevailing action of the antagonistic evertor muscles.

Bruno Vie; Nicolas Gomez; Christelle Brerro-Saby; Jean Paul Weber; Yves Jammes

2013-01-01T23:59:59.000Z

454

Reversible Bending Fatigue Test System for Investigating Vibration Integrity of Spent Nuclear Fuel during Transportation  

SciTech Connect

Transportation packages for spent nuclear fuel (SNF) must meet safety requirements under normal and accident conditions as specified by federal regulations. During transportation, SNF experiences unique conditions and challenges to cladding integrity due to the vibrational and impact loading during road or rail shipment. Oak Ridge National Laboratory (ORNL) has been developing testing capabilities that can be used to improve the understanding of the impacts on SNF integrity due to vibration loading, especially for high burn-up SNF in normal transportation operation conditions. This information can be used to meet the nuclear industry and U.S. Nuclear Regulatory Commission needs in the area of safety and security of spent nuclear fuel storage and transport operations. The ORNL developed test system can perform reversible-bending fatigue testing to evaluate both the static and dynamic mechanical response of SNF rods under simulated loads. The testing apparatus is also designed to meet the challenges of hot-cell operation, including remote installation and detachment of the SNF test specimen, in-situ test specimen deformation measurement, and implementation of a driving system suitable for use in a hot cell. The system contains a U-frame set-up equipped with uniquely designed grip rigs, to protect SNF rod and to ensure valid test results, and use of 3 specially designed LVDTs to obtain the in-situ curvature measurement. A variety of surrogate test rods have been used to develop and calibrate the test system as well as in performing a series of systematic cyclic fatigue tests. The surrogate rods include stainless steel (SS) cladding, SS cladding with cast epoxy, and SS cladding with alumina pellets inserts simulating fuel pellets. Testing to date has shown that the interface bonding between the SS cladding and the alumina pellets has a significant impact on the bending response of the test rods as well as their fatigue strength. The failure behaviors observed from tested surrogate rods provides a fundamental understanding of the underlying failure mechanisms of the SNF surrogate rod under vibration which has not been achieved previously. The newly developed device is scheduled to be installed in the hot-cell in summer 2013 to test high burnup SNF.

Wang, Jy-An John [ORNL] [ORNL; Wang, Hong [ORNL] [ORNL; Bevard, Bruce Balkcom [ORNL] [ORNL; Howard, Rob L [ORNL] [ORNL; Flanagan, Michelle [U.S. Nuclear Regulatory Commission] [U.S. Nuclear Regulatory Commission

2013-01-01T23:59:59.000Z

455

ITP Metal Casting: Implementation of Metal Casting Best Practices  

Energy.gov (U.S. Department of Energy (DOE))

The project examined cases where metal casters had implemented ITP research results and detailed the benefits they received due to that implementation.

456

International Recycling of LLW Metals  

SciTech Connect

Melting of radioactive scrap metal has been successfully practiced for more than 15 years, with approximately 60,000 tons of steel being processed into beneficial reuse applications. This process has converted radioactive scrap metal at a licensed facility into useful products such as shield blocks, security barriers and shield containers. These products are used within the nuclear industry, such as nuclear power plants, waste disposal facilities and high-energy physics research facilities. Recycling provides the following benefits by comparison with direct disposal: - Preserving metal resources. - Conserving valuable Low Level Waste (LLW) disposal site resources, thereby extending disposal site life. - Reducing the cost of metal products to end users by using materials less expensive than virgin metals. This paper outlines international metal recycling practices implemented at EnergySolutions' Bear Creek Facility in Oak Ridge, Tennessee. (authors)

Eshleman, T.; Jansen, J. [EnergySolutions (United States); Shinya, Sawada [KEK - High Energy Accelerator Research Organization (Japan)

2008-07-01T23:59:59.000Z

457

Metal to ceramic sealed joint  

DOE Patents (OSTI)

A metal to ceramic sealed joint which can withstand wide variations in temperature and maintain a good seal is provided for use in a device adapted to withstand thermal cycling from about 20 to about 1000 degrees C. The sealed joint includes a metal member, a ceramic member having an end portion, and an active metal braze forming a joint to seal the metal member to the ceramic member. The joint is positioned remote from the end portion of the ceramic member to avoid stresses at the ends or edges of the ceramic member. The sealed joint is particularly suited for use to form sealed metal to ceramic joints in a thermoelectric generator such as a sodium heat engine where a solid ceramic electrolyte is joined to metal parts in the system.

Lasecki, John V. (Livonia, MI); Novak, Robert F. (Farmington Hills, MI); McBride, James R. (Ypsilanti, MI)

1991-01-01T23:59:59.000Z

458

Metal to ceramic sealed joint  

DOE Patents (OSTI)

A metal to ceramic sealed joint which can withstand wide variations in temperature and maintain a good seal is provided for use in a device adapted to withstand thermal cycling from about 20 to about 1000 degrees C. The sealed joint includes a metal member, a ceramic member having an end portion, and an active metal braze forming a joint to seal the metal member to the ceramic member. The joint is positioned remote from the end portion of the ceramic member to avoid stresses at the ends or edges of the ceramic member. The sealed joint is particularly suited for use to form sealed metal to ceramic joints in a thermoelectric generator such as a sodium heat engine where a solid ceramic electrolyte is joined to metal parts in the system. 11 figures.

Lasecki, J.V.; Novak, R.F.; McBride, J.R.

1991-08-27T23:59:59.000Z

459

ITP Metal Casting: A Vision for the U.S. Metal Casting Industry...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

mcvision.pdf More Documents & Publications ITP Metal Casting: Metalcasting Industry Technology Roadmap ITP Metal Casting: Implementation of Metal Casting Best Practices ITP...

460

Metal-ceramic joint assembly  

DOE Patents (OSTI)

A metal-ceramic joint assembly in which a brazing alloy is situated between metallic and ceramic members. The metallic member is either an aluminum-containing stainless steel, a high chromium-content ferritic stainless steel or an iron nickel alloy with a corrosion protection coating. The brazing alloy, in turn, is either an Au-based or Ni-based alloy with a brazing temperature in the range of 9500 to 1200.degree. C.

Li, Jian (New Milford, CT)

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Method for preparing porous metal hydride compacts  

DOE Patents (OSTI)

A method for preparing porous metallic-matrix hydride compacts which can be repeatedly hydrided and dehydrided without disintegration. A mixture of a finely divided metal hydride and a finely divided matrix metal is contacted with a poison which prevents the metal hydride from dehydriding at room temperature and atmospheric pressure. The mixture of matrix metal and poisoned metal hydride is then compacted under pressure at room temperature to form porous metallic-matrix hydride compacts.

Ron, M.; Gruen, D.M.; Mendelsohn, M.H.; Sheft, I.

1980-01-21T23:59:59.000Z

462

A review of fatigue crack growth rates for offshore steels in air and seawater environments  

SciTech Connect

A literature review of fatigue crack growth rates (FCGR) has been performed for steels in air and seawater environments, either free corroding or with applied cathodic protection potentials of {minus}850 and {minus}1050/{minus}1100 mV Ag/AgCl. In all cases a more precise description of cracking was obtained using a bi-linear growth law rather than the more conventional Paris Law. Recommendations were made for mean and design values of the constants C and m on a piece-wise basis suitable for use in fracture mechanics analyses of structures. An effect of R-ratio was observed, and separate recommendations were made for high and low R-ratios to cater for as-welded, and post weld heat treated joints with low mean stress levels.

King, R.N. [Failure Control Ltd., Cranleigh (United Kingdom); Stacey, A.; Sharp, J.V. [Health and Safety Executive, London (United Kingdom). Offshore Safety Div.

1996-12-01T23:59:59.000Z

463

Clean Metal Casting  

SciTech Connect

The objective of this project is to develop a technology for clean metal processing that is capable of consistently providing a metal cleanliness level that is fit for a given application. The program has five tasks: Development of melt cleanliness assessment technology, development of melt contamination avoidance technology, development of high temperature phase separation technology, establishment of a correlation between the level of melt cleanliness and as cast mechanical properties, and transfer of technology to the industrial sector. Within the context of the first task, WPI has developed a standardized Reduced Pressure Test that has been endorsed by AFS as a recommended practice. In addition, within the context of task1, WPI has developed a melt cleanliness sensor based on the principles of electromagnetic separation. An industrial partner is commercializing the sensor. Within the context of the second task, WPI has developed environmentally friendly fluxes that do not contain fluorine. Within the context of the third task, WPI modeled the process of rotary degassing and verified the model predictions with experimental data. This model may be used to optimize the performance of industrial rotary degassers. Within the context of the fourth task, WPI has correlated the level of melt cleanliness at various foundries, including a sand casting foundry, a permanent mold casting foundry, and a die casting foundry, to the casting process and the resultant mechanical properties. This is useful in tailoring the melt cleansing operations at foundries to the particular casting process and the desired properties of cast components.

Makhlouf M. Makhlouf; Diran Apelian

2002-02-05T23:59:59.000Z

464

``Towards Strange Metallic Holography'  

SciTech Connect

We initiate a holographic model building approach to 'strange metallic' phenomenology. Our model couples a neutral Lifshitz-invariant quantum critical theory, dual to a bulk gravitational background, to a finite density of gapped probe charge carriers, dually described by D-branes. In the physical regime of temperature much lower than the charge density and gap, we exhibit anomalous scalings of the temperature and frequency dependent conductivity. Choosing the dynamical critical exponent z appropriately we can match the non-Fermi liquid scalings, such as linear resistivity, observed in strange metal regimes. As part of our investigation we outline three distinct string theory realizations of Lifshitz geometries: from F theory, from polarized branes, and from a gravitating charged Fermi gas. We also identify general features of renormalization group flow in Lifshitz theories, such as the appearance of relevant charge-charge interactions when z {ge} 2. We outline a program to extend this model building approach to other anomalous observables of interest such as the Hall conductivity.

Hartnoll, Sean A.; /Harvard U., Phys. Dept. /Santa Barbara, KITP /UC, Santa Barbara; Polchinski, Joseph; Silverstein, Eva; /Santa Barbara, KITP /UC, Santa Barbara; Tong, David; /Cambridge U., DAMTP /Santa Barbara, KITP /UC, Santa Barbara

2010-08-26T23:59:59.000Z

465

Metal deposition using seed layers  

DOE Patents (OSTI)

Methods of forming a conductive metal layers on substrates are disclosed which employ a seed layer to enhance bonding, especially to smooth, low-roughness or hydrophobic substrates. In one aspect of the invention, the seed layer can be formed by applying nanoparticles onto a surface of the substrate; and the metallization is achieved by electroplating an electrically conducting metal onto the seed layer, whereby the nanoparticles serve as nucleation sites for metal deposition. In another approach, the seed layer can be formed by a self-assembling linker material, such as a sulfur-containing silane material.

Feng, Hsein-Ping; Chen, Gang; Bo, Yu; Ren, Zhifeng; Chen, Shuo; Poudel, Bed

2013-11-12T23:59:59.000Z

466

Metal-Insulator Transition in MetalRare-Gas Alloys  

Science Journals Connector (OSTI)

We present the results of electrical resistivity and optical absorption measurements for compositions spanning the metal-insulator transition in RbKr and CsXe alloys. The two transitions are similar and exhibit an apparently percolative character. No marked emergence of excitons accompanies the disappearance of conductivity. Spectral features associated with metallic conduction also persist through the transitions.

D. J. Phelps; R. Avci; C. P. Flynn

1975-01-06T23:59:59.000Z

467

Nonequilibrium electron tunneling in metal-insulator-metal junctions  

Science Journals Connector (OSTI)

The small structure in the conductance curve near zero bias of metal-insulator-metal tunnel junctions has been studied extensively. These experiments are analyzed in detail in a nonequilibrium model. It is shown that this type of zero-bias anomaly can be accounted for entirely by an electron bottleneck arising from the blocking of tunneling states due to nonzero electron relaxation times.

J. G. Adler; H. J. Kreuzer; J. Straus

1975-04-15T23:59:59.000Z

468

Theory of bonding of transition metals to nontransition metals  

Science Journals Connector (OSTI)

We present a theory of the chemical bond in compounds consisting of both transition metals and nontransition metals. Chemical trends in the bonding properties are established by directly comparing the total energies of a large number of such compounds with the total energies of their constituents. These chemical trends are analyzed in terms of the s-, p-, and d-like state densities of the compounds and the constituents. Rather different types of bonding are shown to result when the atomic s and p levels of the nontransition metal lie above, below, and near the energy of the transition-metal d level. The heat of compound formation is shown to result from a competition between two simple physical effects: (1) the weakening of the transition-metal bonds by the lattice dilatation required for the accommodation of the nontransition metal, and (2) the increased bonding which results from the occupation of the bonding members of the hybrid states formed from the interaction between the transition-metal d states and the s-p states on the nontransition metal. Our theoretical values for the heats of formation of these compounds are generally similar to those given by Miedema's empirical formula. Distinctive aspects of the variation of the heat of formation with the number of valence electrons reveal, however, that the microscopic picture on which the empirical formula is based is quite different from that given by our self-consistent energy-band theory.

C. D. Gelatt; Jr.; A. R. Williams; V. L. Moruzzi

1983-02-15T23:59:59.000Z

469

Devastated crops: multifunctional efficacy for the production of nanoparticles  

Science Journals Connector (OSTI)

Integration of green chemistry principles to nanotechnology is one of the key issues in nanoscience research. Biological methods were used to synthesize metal and metal oxide nanoparticles of specific shape and size since they enhance the properties ...

G. Madhumitha; Selvaraj Mohana Roopan

2013-01-01T23:59:59.000Z

470

Effects of austempering temperature on fatigue crack rate propagation in a series of modified (Cu, Ni, and/or Mo) nodular irons  

Science Journals Connector (OSTI)

Studies on austempered nodular cast irons were carried out to establish the optimum isothermic heat treatment at a given chemical composition that rendered the highest fatigue crack propagation resistance. Sev...

M. Martnez-Madrid; R. Rodrguez-T

2002-12-01T23:59:59.000Z

471

Validation of the state-space model of fatigue crack growth in ductile alloys under variable-amplitude load via comparison of the crack-opening stress data  

Science Journals Connector (OSTI)

A state-space model of fatigue crack growth in ductile alloys under variable-amplitude load was presented by Patankar and Ray (Patankar...International Journal of Fracture, 90, 235--249; Patankar and Ray (2000).

Ravindra Patankar; Rong Qu

2005-02-01T23:59:59.000Z

472

Design and experimental studies of low-cycle fatigue defects in turbine disks of aircraft long-life gas turbine engines  

Science Journals Connector (OSTI)

Some data obtained in the course of numerous studies that include the calculated evaluation of the stressed state and cyclic life of disks up to low-cycle fatigue crack nucleation are presented. Also included ...

N. P. Velikanova; L. R. Botvina; G. P. Okatova

2008-12-01T23:59:59.000Z

473

Catalytic production of metal carbonyls from metal oxides  

DOE Patents (OSTI)

This invention relates to the formation of metal carbonyls from metal oxides and specially the formation of molybdenum carbonyl and iron carbonyl from their respective oxides. Copper is used here in admixed form or used in chemically combined form as copper molybdate. The copper/metal oxide combination or combined copper is utilized with a solvent, such as toluene and subjected to carbon monoxide pressure of 25 atmospheres or greater at about 150 to 260/sup 0/C. The reducing metal copper is employed in catalytic concentrations or combined concentrations as CuMoO/sub 4/ and both hydrogen and water present serve as promoters. It has been found that the yields by this process have been salutary and that additionally the catalytic metal may be reused in the process to good effect. 3 tables.

Sapienza, R.S.; Slegeir, W.A.; Foran, M.T.

1984-01-06T23:59:59.000Z

474

Inuence of foreign-object damage on crack initiation and early crack growth during high-cycle fatigue of Ti6Al4V  

E-Print Network (OSTI)

; Ti±6Al±4V 1. Introduction The high-cycle fatigue (HCF) of aircraft gas-turbine engine components has of small surface fatigue cracks in a Ti±6Al±4V alloy, processed for typical turbine blade applications microcracks in the damaged zone (seen only at the higher impact velocities). Furthermore, the eect of residual

Ritchie, Robert

475

Creating bulk nanocrystalline metal.  

SciTech Connect

Nanocrystalline and nanostructured materials offer unique microstructure-dependent properties that are superior to coarse-grained materials. These materials have been shown to have very high hardness, strength, and wear resistance. However, most current methods of producing nanostructured materials in weapons-relevant materials create powdered metal that must be consolidated into bulk form to be useful. Conventional consolidation methods are not appropriate due to the need to maintain the nanocrystalline structure. This research investigated new ways of creating nanocrystalline material, new methods of consolidating nanocrystalline material, and an analysis of these different methods of creation and consolidation to evaluate their applicability to mesoscale weapons applications where part features are often under 100 {micro}m wide and the material's microstructure must be very small to give homogeneous properties across the feature.

Fredenburg, D. Anthony (Georgia Institute of Technology, Atlanta, GA); Saldana, Christopher J. (Purdue University, West Lafayette, IN); Gill, David D.; Hall, Aaron Christopher; Roemer, Timothy John (Ktech Corporation, Albuquerque, NM); Vogler, Tracy John; Yang, Pin

2008-10-01T23:59:59.000Z

476

Metal recovery from porous materials  

DOE Patents (OSTI)

The present invention relates to recovery of metals. More specifically, the present invention relates to the recovery of plutonium and other metals from porous materials using microwaves. The United States Government has rights in this invention pursuant to Contract No. DE-AC09-89SR18035 between the US Department of Energy and Westinghouse Savannah River Company.

Sturcken, E.F.

1991-01-01T23:59:59.000Z

477

PHYSICAL PROPERTIES OF METALS1  

Science Journals Connector (OSTI)

... the application of pressing and shaping force is afforded by the processes in use for "teapot spinning,"i.e. the production of a Britannia-metal ... spinning,"i.e. the production of a Britannia-metal teapot by a process technically termed spinning. The alloy being rolled into sheets of convenient ...

1878-05-16T23:59:59.000Z

478

Formation of zirconium metallic glass  

Science Journals Connector (OSTI)

... Bulk metallic glasses are commonly produced by the rapid cooling of liquid alloys. They have emerged over ... a novel class of materials, with attractive properties and technological promise. The bulk metallic glasses so far produced contain three or more component elements. These complex compositions are necessary ...

Jianzhong Zhang; Yusheng Zhao

2004-07-15T23:59:59.000Z

479

Metal binding in an aluminum based metal-organic framework for...  

NLE Websites -- All DOE Office Websites (Extended Search)

Metal binding in an aluminum based metal-organic framework for carbon dioxide capture Link to article...

480

Durability of metals from archaeological objects, metal meteorites, and native metals  

SciTech Connect

Metal durability is an important consideration in the multi-barrier nuclear waste storage concept. This study summarizes the ancient metals, the environments, and factors which appear to have contributed to metal longevity. Archaeological and radiochemical dating suggest that human use of metals began in the period 6000 to 7000 BC. Gold is clearly the most durable, but many objects fashioned from silver, copper, bronze, iron, lead, and tin have survived for several thousand years. Dry environments, such as tombs, appear to be optimum for metal preservation, but some metals have survived in shipwrecks for over a thousand years. The metal meteorites are Fe-base alloys with 5 to 60 wt% Ni and minor amounts of Co, I, and S. Some meteoritic masses with ages estimated to be 5,000 to 20,000 years have weathered very little, while other masses from the same meteorites are in advanced stages of weathering. Native metals are natural metallic ores. Approximately five million tonnes were mined from native copper deposits in Michigan. Copper masses from the Michigan deposits were transported by the Pleistocene glaciers. Areas on the copper surfaces which appear to represent glacial abrasion show minimal corrosion. Dry cooling tower technology has demonstrated that in pollution-free moist environments, metals fare better at temperatures above than below the dewpoint. Thus, in moderate temperature regimes, elevated temperatures may be useful rather than detrimental for exposures of metal to air. In liquid environments, relatively complex radiolysis reactions can occur, particularly where multiple species are present. A dry environment largely obviates radiolysis effects.

Johnson, A.B. Jr.; Francis, B.

1980-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "metal fatigue nanoscience" 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

Method for preparing metal powder, device for preparing metal powder, method for processing spent nuclear fuel  

DOE Patents (OSTI)

A method for producing metal powder is provided the comprising supplying a molten bath containing a reducing agent, contacting a metal oxide with the molten bath for a time and at a temperature sufficient to reduce the metal in the metal oxide to elemental metal and produce free oxygen; and isolating the elemental metal from the molten bath.

Park, Jong-Hee (Clarendon Hills, IL)

2011-11-29T23:59:59.000Z

482

Theory manual for FAROW version 1.1: A numerical analysis of the Fatigue And Reliability Of Wind turbine components  

SciTech Connect

Because the fatigue lifetime of wind turbine components depends on several factors that are highly variable, a numerical analysis tool called FAROW has been created to cast the problem of component fatigue life in a probabilistic framework. The probabilistic analysis is accomplished using methods of structural reliability (FORM/SORM). While the workings of the FAROW software package are defined in the user's manual, this theory manual outlines the mathematical basis. A deterministic solution for the time to failure is made possible by assuming analytical forms for the basic inputs of wind speed, stress response, and material resistance. Each parameter of the assumed forms for the inputs can be defined to be a random variable. The analytical framework is described and the solution for time to failure is derived.

WUBTERSTEUBMSTEVEB R.; VEERS,PAUL S.

2000-01-01T23:59:59.000Z

483

Effect of TiN coatings on the rolling contact fatigue behavior of M50 bearing steel. Final report  

SciTech Connect

There is a continuing requirement for improved bearing performance for both commercial and military applications. Service temperatures are increasing steadily due to increased power requirements and corrosion of components remains a major concern as well, particularly for bearings in military systems. In our ongoing study, a number of different coatings were applied to VIM-VAR M50 bearing steel to improve both corrosion resistance and rolling contact fatigue behavior. This report deals specifically with coatings produced by the ion beam assisted deposition IBAD of TiN, details of the coating process, and test results obtained. The rolling contact fatigue performance of IBAD TiN coated M50 samples demonstrated increased lifetime performance and durability for a 1 micrometer thick coating. Preliminary data on corrosion properties is also presented.

Middleton, R.M.; Huang, P.J.; Wells, M.G.; Kant, R.A.

1992-12-01T23:59:59.000Z

484

Microbial controls on metal ion mobility  

E-Print Network (OSTI)

In this dissertation, the biogeochemical controls on metal mobility in the subsurface are examined; specifically, the release of metals from buried mineralization, the transport of metals through overburden, and the ...

Leslie, Karla Louise

2012-12-31T23:59:59.000Z

485

Metal-directed protein self-assembly  

E-Print Network (OSTI)

Metal-Directed Protein Self- Assembly. Acc. Chem. Res. 43,Metal-directed protein self-assembly. Acc. Chem. Res. 43,Metal- mediated self-assembly of protein superstructures:

Salgado. Eric N.

2010-01-01T23:59:59.000Z

486

Bad Metals Made with Good-Metal Components  

Science Journals Connector (OSTI)

We have grown thin stable films of a good metal, Ag, that have characteristics of bad metals: high resistivity, strong temperature dependence of resistivity, and lack of resistive saturation. For films of different thickness, the temperature-dependent resistance and the Hall effect resistance provide evidence that the apparent bad metallicity is a consequence of the microstructure of the film rather than the result of new physics. This microstructure, which we characterize with scanning probe techniques, occurs on length scales comparable to the mean free path, thereby changing the sign of the classical magnetoresistance from positive to negative.

S. B. Arnason; S. P. Herschfield; A. F. Hebard

1998-11-02T23:59:59.000Z

487

Thermal Fatigue of Polycrystalline Copper in CLIC Accelerating Structures: Surface Roughening and Hardening as a Function of Grain Orientation  

E-Print Network (OSTI)

The accelerating structures of CLIC will be submitted to 2 x 1010 thermal-mechanical fatigue cycles, arising from Radio Frequency (RF) induced eddy currents, causing local superficial cyclic heating. In order to assess the effects of superficial fatigue, high temperature annealed OFE Copper samples were thermally fatigued with the help of pulsed laser irradiation. They underwent postmortem Electron Backscattered Diffraction (EBSD) measurements and?hardness observations. Previous work has confirmed that surface roughening depends on the orientation of near-surface grains*,**. It is clearly observed that, through thermal cycling, the increase of hardness of a crystallographic direction is related to the amount of surface roughening induced by fatigue. Near-surface grains, oriented [1 0 0] with respect to the surface, exhibiting ver...

Aicheler, M

2010-01-01T23:59:59.000Z

488

Effect of heat treatment and heat-to-heat variations in the fatigue-crack growth response of Alloy 718  

SciTech Connect

The fatigue-crack growth behavior of seven heats of Alloy 718 was studied at five different test temperatures. These seven heats represented at least four different producers, four different product forms, two melt practices, and most of the heat were tested in two different heat-treated conditions. Heat-to-heat variations were noted; these were most obvious in material given the conventional heat-treatment. 8 figs., 5 tabs.

James, L.A.; Mills, W.J.

1980-04-01T23:59:59.000Z

489

Influence of Microstructure on High-Cycle Fatigue of Ti-6Al-4V: Bimodal vs. Lamellar Structures  

E-Print Network (OSTI)

for such failures in Ti-6Al-4V, a commonly used turbine blade alloy, specifically for fan and compressor blades.K. NALLA, B.L. BOYCE, J.P. CAMPBELL, J.O. PETERS, and R.O. RITCHIE The high-cycle fatigue (HCF) of titanium] HCF can result in essentially unpredictable used for blade and disk applications in the front (low

Ritchie, Robert

490

MULTI-SCALE DIFFRACTION STUDY OF REVERSIBLE/IRREVERSIBLE DEFORMATION MECHANISMS IN THE NI-BASED SUPERALLOYS DURING FATIGUE  

SciTech Connect

In this study, a nickel-based polycrystalline is subjected to cyclic loading. The subsequent fatigue damage has been investigated with in-situ neutron-diffraction, thermal characterization for a single-phase, transmission-electron microscopy (TEM) and polychromatic X-ray microdiffraction (PXM). Different stages of fatigue damage are observed including bulk hardening, softening, and eventual saturation evident in the diffraction patterns and the thermal-evolution features. An increase in dislocation density is responsible for hardening within the early cycles. The transition to saturation cycles is characterized by the anisotropy of the lattice-strain evolution. Inhomogeneity of the thermal response and irreversible compression of the lattice planes and statistical dislocation structures are observed in the final saturation fatigue cycles. Analysis of the PXM-Laue patterns reveals cyclically-deformed microstructure near the grain boundaries, which are composed of the lattice rotations and grain subdivisions. The PXM results are in good agreement with the TEM results. Combined simulation/experimental analysis allows determination of slip-system dependent dislocation density in individual grains.

Barabash, Rozaliya [ORNL; Huang, E-Wen [ORNL; Clausen, Bjorn [ORNL; Liu, W. [Argonne National Laboratory (ANL); Ice, Gene E [ORNL; Liaw, Peter K [University of Tennessee, Knoxville (UTK)

2010-01-01T23:59:59.000Z

491

Metal-based reactive nanomaterials  

Science Journals Connector (OSTI)

Recent developments in materials processing and characterization resulted in the discovery of a new type of reactive materials containing nanoscaled metal components. The well-known high oxidation energies of metallic fuels can now be released very rapidly because of the very high reactive interface areas in such metal-based reactive nanomaterials. Consequently, these materials are currently being examined for an entire range of applications in energetic formulations inappropriate for conventional, micron-sized metal fuels having relatively low reaction rates. New application areas, such as reactive structural materials, are also being explored. Research remains active in manufacturing and characterization of metal-based reactive nanomaterials including elemental metal nanopowders and various nanocomposite material systems. Because of the nanometer scale of the individual particles, or phase domains, and because of the very high enthalpy of reaction between components of the nanocomposite materials, the final phase compositions, morphology, and thermodynamic properties of the reactive nanocomposite materials may be different from those of their micron-scaled counterparts. Ignition mechanisms in such materials can be governed by heterogeneous reactions that are insignificant for materials with less developed reactive interface areas. New combustion regimes are being observed that are affected by very short ignition delays combined with very high metal combustion temperatures. Current progress in this rapidly growing research area is reviewed and some potential directions for the future research are discussed.

Edward L. Dreizin

2009-01-01T23:59:59.000Z

492

Metal-doped organic foam  

DOE Patents (OSTI)

Organic foams having a low density and very small cell size and method for producing same in either a metal-loaded or unloaded (nonmetal loaded) form are described. Metal-doped foams are produced by soaking a polymer gel in an aqueous solution of desired metal salt, soaking the gel successively in a solvent series of decreasing polarity to remove water from the gel and replace it with a solvent of lower polarity with each successive solvent in the series being miscible with the solvents on each side and being saturated with the desired metal salt, and removing the last of the solvents from the gel to produce the desired metal-doped foam having desired density cell size, and metal loading. The unloaded or metal-doped foams can be utilized in a variety of applications requiring low density, small cell size foam. For example, rubidium-doped foam made in accordance with the invention has utility in special applications, such as in x-ray lasers.

Rinde, James A. (Livermore, CA)

1982-01-01T23:59:59.000Z

493

Metal Hydride Hydrogen Storage R and D  

Energy.gov (U.S. Department of Energy (DOE))

DOE's research on complex metal hydrides targets the development of advanced metal hydride materials including light-weight complex hydrides, destabilized binary hydrides, intermetallic hydrides,...

494

Metal-Organic Heat Carrier Nanofluids. | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

Organic Heat Carrier Nanofluids. Metal-Organic Heat Carrier Nanofluids. Abstract: Nanofluids, dispersions of metal or oxide nanoparticles in a base working fluid, are being...

495

Accelerated Cellulose Depolymerization Catalyzed by Paired Metal...  

NLE Websites -- All DOE Office Websites (Extended Search)

Depolymerization Catalyzed by Paired Metal Chlorides in Ionic Liquid Solvent. Accelerated Cellulose Depolymerization Catalyzed by Paired Metal Chlorides in Ionic Liquid...

496

Metal Hydride Hydrogen Storage Research and Development  

Energy.gov (U.S. Department of Energy (DOE))

DOE's research on complex metal hydrides targets the development of advanced metal hydride materials including light-weight complex hydrides, destabilized binary hydrides, intermetallic hydrides,...

497

Metal Roofing Alliance (MRA) | Open Energy Information  

Open Energy Info (EERE)

Metal Roofing Alliance (MRA) Jump to: navigation, search Name: Metal Roofing Alliance (MRA) Place: Belfair, WA Information About Partnership with NREL Partnership with NREL Yes...

498

METAL NANOPARTICLES FUNCTIONALIZED WITH METAL-LIGAND COVALENT BONDS  

E-Print Network (OSTI)

fundamental and technological perspectives, largely because these nanomaterials show unique optical and electronicelectronic energy structures, which may serve as a fundamentaland electronic characteristics, the metal nanoparticles have been attracting extensive interest in the field of fundamental

Kang, Xiongwu

2012-01-01T23:59:59.000Z

499

Nonmetal-metal transition in metalmolten-salt solutions  

Science Journals Connector (OSTI)

The method of ab initio molecular dynamics, based on finite-temperature density-functional theory, is used to study the nonmetal-metal transition in two different metalmolten-salt solutions, Kx(KCl)1-x and Nax(NaBr)1-x. As the excess metal concentration is increased the electronic density becomes delocalized and percolating conducting paths are formed, making a significant dc electrical conductivity possible. This marks the onset of the metallic regime. By calculating several electronic and structural properties, remarkable differences between the two solutions are observed. The anomalous behavior of Nax(NaBr)1-x, typical of all the Na-NaX solutions, is found to be related to the strong attractive interaction between the sodium ions and the excess electrons. 1996 The American Physical Society.

Pier Luigi Silvestrelli; Ali Alavi; Michele Parrinello; Daan Frenkel

1996-05-15T23:59:59.000Z

500

Magnetism in Transition Metals  

Science Journals Connector (OSTI)

An attempt is made to distinguish "band-type magnetization" from "alignment-type magnetization" on the basis of whether the local moments associated with the Wannier functions on the atom sites are "induced" or "permanent." In general, the local moment is partially induced and partially permanent, and a criterion is suggested: A local moment is defined to be of the permanent variety if in the presence of magnetic forces (supposed characteristic of the crystal in a given circumstance) tending to produce a moment in one sense (z^, say) of a direction, it can maintain itself (perhaps altered in magnitude, however) in the opposite sense (-z^), as well as in z^. The internal mechanisms tending to produce permanent moments are simplified to just the Hcorr of Anderson, and the external inducing mechanism are the Heisenberg interaction and a magnetic field, Hspin, say. If Hcorr dominates Hspin, then it is shown that a local moment can maintain itself to the polarizing tendencies (whence an alignment type of magnetization calculation is appropriate), but if Hspin dominates Hcorr, then the local moment has only one sense possible in this environment (and a band type of calculation is appropriate). It is suggested that this distinction is relevant to transition metals.

M. Bailyn

1965-09-13T23:59:59.000Z