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Ductile, Brittle Failure Characteristics as Determined by the State of the Material and the Imposed State of Stress
A method is developed for determining whether a particular mode of failure is expected to be of ductile type or brittle type depending upon both the state of the material and the particular state of stressing the isotropic material to failure. The state of the material is determined by two specific failure properties and a newly formulated failure theory. The ductile versus brittle criterion then involves the state of the material specification and the mean normal stress part of the imposed stress state. Several examples are given for different stress states and a spectrum of materials types. Closely related to the failure mode types are the orientations of the associated failure surfaces. The resulting failure surface angle predictions are compared with those from the Coulomb-Mohr failure criterion. In uniaxial tension, only the present method correctly predicts the octahedral failure angle at the ductile limit, and also shows a distinct failure mode transition from ductile type to brittle type as the state of the material changes. The explicit D-B criterion and the related failure surface orientation methodology are intended to provide a refinement and generalization of the ductile-brittle transition viewed only as a state property to also include a dependence upon …
Date:
February 5, 2004
Creator:
Christensen, R M
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 86, No. 71, Ed. 1 Monday, February 5, 2007
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 5, 2007
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 88, No. 36, Ed. 1 Tuesday, February 5, 2008
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 5, 2008
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 89, No. 36, Ed. 1 Thursday, February 5, 2009
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 5, 2009
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Baseline Parameter Update for Human Health Input and Transfer Factors for Radiological Performance Assessments at the Savannah River Site
The purpose of this report is to update parameters utilized in Human Health Exposure calculations and Bioaccummulation Transfer Factors utilized at SRS for Performance Assessment model.
Date:
February 5, 2007
Creator:
Coffield, T & Patricia Lee, P
Object Type:
Report
System:
The UNT Digital Library
Products Liability: A Legal Overview
None
Date:
February 5, 2003
Creator:
Cohen, Henry
Object Type:
Report
System:
The UNT Digital Library
Effects of Point Sources in Trench Disposal of Radioactive Waste
At the U. S. Department of Energy Savannah River Site, disposal of radioactive wastes in shallow trenches was simulated with vadose zone models and decoupled aquifer models. The vadose zone models provided contaminant fluxes to the aquifer models.
Date:
February 5, 2003
Creator:
Collard, L.B.
Object Type:
Article
System:
The UNT Digital Library
Changes to the OMB Regulatory Review Process by Executive Order 13422
This report consists of changes to the OMB regulatory review process by executive order 13422.
Date:
February 5, 2007
Creator:
Copeland, Curtis W.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Leroy Cox, February 5, 2004
The National Museum of the Pacific War presents an interview with Leroy Cox. Cox was flying a crop duster in Colorado when he was drafted into the Army. He did not tell the Army he could fly and was trained as an armorer for B-17 bombers. Once someone found he could fly, he was sent to flight school. He eventually trained as a tow pilot for gliders, then as a glider pilot in South Carolina. He never was called to go overseas and was discharged in November 1945.
Date:
February 5, 2004
Creator:
Cox, Leroy
Object Type:
Text
System:
The Portal to Texas History
Battlefield Utility of Antipersonnel Landmines and Proposed Alternatives (Analysis in Support of the NATO SAS-023 APM Study)
This study consists of work done in support of the U.S. delegation to the NATO SAS-023 Antipersonnel Landmine Study Group, supplemented by additional work done for the U.S. Office of the Secretary of Defense Antipersonnel Landmine Alternative Concept Exploration Program (Track III). It explores the battlefield utility of current antipersonnel landmines (APL) in both pure and mixed APL/antitank minefields and evaluates the value of military suggested non-materiel alternatives. The historical record is full of examples where the presence (or absence) of antipersonnel landmines made a critical difference in battle. The current generation of military thinkers and writers lack any significant combat experience employing either mixed or antipersonnel minefields, which leaves a critical gap in available expert advice for policy and decision-makers. Because of this lack of experienced-based professional military knowledge, Lawrence Livermore National Laboratory analyzed the employment of antipersonnel landmines in tactical mixed minefields and in protective antipersonnel minefields. The scientific method was employed where hypotheses were generated from the tactics and doctrine of the antipersonnel landmine era and tested in a simulation laboratory. A high-resolution, U.S. Joint Forces Command combat simulation model (the Joint Conflict and Tactical Simulation--JCATS) was used as the laboratory instrument. A realistic European scenario was …
Date:
February 5, 2002
Creator:
Crandley, J. F., Jr.; Greenwalt, R. J., Jr.; Magnoli, D. E. & Randazzo, A. S.
Object Type:
Report
System:
The UNT Digital Library
Japan-U.S. Relations: Issues for Congress
None
Date:
February 5, 2003
Creator:
Cronin, Richard P.
Object Type:
Report
System:
The UNT Digital Library
The University News (Irving, Tex.), Vol. 38, No. 14, Ed. 1 Tuesday, February 5, 2008
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
February 5, 2008
Creator:
Crotty, Sarah
Object Type:
Newspaper
System:
The Portal to Texas History
BRAHMS OVERVIEW
A brief review of BRAHMS measurements of bulk particle production in RHIC Au+Au collisions at {radical}s{sub NN} 200GeV is presented, together with some discussion of baryon number transport. Intermediate p{sub T} measurements in different collision systems (Au+Au, d+ Au and p+p) are also discussed in the context of jet quenching and saturation of the gluon density in Au ions at RHIC energies. This report also includes preliminary results for identified particles at forward rapidities in d+Au and Au+Au collisions.
Date:
February 5, 2005
Creator:
DEBBE, R. & COLLABORATION, FOR THE BRAHMS
Object Type:
Article
System:
The UNT Digital Library
Guest Recital: 2000-02-05 Dallas Symphony Orchestra
Access:
Use of this item is restricted to the UNT Community
Guest artist recital performed at the UNT College of Music
Date:
February 5, 2000
Creator:
Dallas Symphony Orchestra
Object Type:
Sound
System:
The UNT Digital Library
Electrochemical Testing of Gas Tungsten Arc Welded and Reduced Pressure Electron Beam Welded Alloy 22
Alloy 22 (N06022) is the material selected for the fabrication of the outer shell of the nuclear waste containers for the Yucca Mountain high-level nuclear waste repository site. A key technical issue in the waste package program has been the integrity of the container weld joints. The currently selected welding process for fabricating and sealing the containers is the traditional gas tungsten arc welding (GTAW) or TIG method. An appealing faster alternative technique is reduced pressure electron beam (RPEB) welding. It was of interest to compare the corrosion properties of specimens prepared using both types of welding techniques. Standard electrochemical tests were carried on GTAW and RPEB welds as well as on base metal (non-welded) to determine their relative corrosion behavior in simulated concentrated water (SCW) at 90 C (alkaline), 1 M HCl at 60 C (acidic) and 1 M NaCl at 90 C (neutral) solutions. Results show that for all practical purposes, the three tested materials had the same electrochemical behavior in the three tested electrolytes.
Date:
February 5, 2006
Creator:
Day, S. D.; Wong, F. G.; Gordon, S. R.; Wong, L. L. & Rebak, R. B.
Object Type:
Article
System:
The UNT Digital Library
Development of a New Stratigraphic Trap Exploration Using Elastic-Wave Seismic Technology
Vecta acquired 9 square miles of 9-C seismic data in Mountrail County, North Dakota with the Mission Canyon shoreline as a primary target. Vecta contracted the Institute Francais du Petrole in order to co-develop a more rigorous multicomponent seismic interpretation product. The final interpretation was very unique in that it utilized not only the 9-C seismic data but also the new jointly developed software. A Mission Canyon anomaly was developed in 2006; however, it was of insufficient size to be a commercial target at the time. Therefore, Vecta analyzed the shear data for anisotropy within the Bakken formation and successfully reentered an abandoned producer within the project area and drilled a horizontal leg through the anomalous zones of the middle member of the Bakken formation. The well was open hole completed, swab tested, sand fraced, and swab tested some more. No shows of oil were ever seen from the Bakken formation, but the well yielded considerable amounts of formation water. The well has been abandoned as non-commercial. From the swab tests, one may conclude considerable permeability exists in the formation, thus confirming the utility of the shear wave to detect fractures within the targeted formation.
Date:
February 5, 2008
Creator:
DeVault, Bryan
Object Type:
Report
System:
The UNT Digital Library
Applying New Methods to Research Reactor Analysis.
Detailed reactor physics and safety analyses are being performed for the 20 MW D{sub 2}O-moderated research reactor at the National Institute of Standards and Technology (NIST). The analyses employ state-of-the-art calculational methods and will contribute to an update to the Final Safety Analysis Report (FSAR). Three-dimensional MCNP Monte Carlo neutron and photon transport calculations are performed to determine power and reactivity parameters, including feedback coefficients and control element worths. The core depletion and determination of the fuel compositions are performed with MONTEBURNS to model the reactor at the beginning, middle, and end-of-cycle. The time-dependent analysis of the primary loop is determined with a RELAP5 transient analysis model that includes the pump, heat exchanger, fuel element geometry, and flow channels. A statistical analysis used to assure protection from critical heat flux (CHF) is performed using a Monte Carlo simulation of the uncertainties contributing to the CHF calculation. The power distributions used to determine the local fuel conditions and margin to CHF are determined with MCNP. Evaluations have been performed for the following accidents: (1) the control rod withdrawal startup accident, (2) the maximum reactivity insertion accident, (3) loss-of-flow resulting from loss of electrical power, (4) loss-of-flow resulting from a primary pump …
Date:
February 5, 2004
Creator:
Diamond, David J.; Cheng, L.; Hanson, A.; Xu, J. & Carew, J. F.
Object Type:
Article
System:
The UNT Digital Library
Chemistry and Materials Science, A Collection of Articles from Science & Technology Review
None
Date:
February 5, 2003
Creator:
Diaz de la Rubia, T
Object Type:
Report
System:
The UNT Digital Library
Compound-Nucleus Formation Following Direct Interactions to Highly-Excited Final States
When direct reactions populate highly excited, unbound configurations in the residual nucleus, the nucleus may further evolve into a compound nucleus. Alternatively, the residual system may decay by emitting particles into the continuum. Understanding the relative weights of these two processes as a function of the angular momentum and parity deposited in the nucleus is important for the surrogate-reaction technique. A particularly interesting case is compound-nucleus formation via the (d, p) reaction, which may be a useful tool for forming compound nuclei off the valley of stability in inverse-kinematics experiments. We present here a study of the compound formation probability for a closely-related direct reaction, direct-semidirect radiative neutron capture.
Date:
February 5, 2008
Creator:
Dietrich, F S
Object Type:
Article
System:
The UNT Digital Library
Modeling of High Precision Neutron Nonelastic Cross Sections
A new method has been applied to the determination of neutron nonelastic cross sections for iron {sup 56}Fe and lead {sup 208}Pb for energies between 5 and 26 MeV. These data have estimated errors of only a few percent and do not suffer from the ambiguities encountered in earlier nonelastic data. We attempt to fit these high precision data using both a semiclassical single phase shift model (nuclear Ramsauer model) as well as a recent global optical model that well reproduces a wide body of neutron scattering observables. At the 5% uncertainty level, both models produce satisfactory fits. However, neither model gives satisfactory fits to these new precise data. We conclude that fitting precise data, i.e., data with errors of approximately 2% or less, may require a nuclear mass dependence of radii that reflects structure effects such as shell closures.
Date:
February 5, 2007
Creator:
Dietrich, F. S.; Anderson, J. D.; Bauer, R. W.; Grimes, S. M. & McNabb, D. P.
Object Type:
Article
System:
The UNT Digital Library
Spotforming with an array of ultra-wideband radio transmitters
Ultra-wideband (UWB) array signal processing has the distinct advantage in that it is possible to illuminate or focus on ''spots'' at distant points in space, as opposed to just illuminating or steering at certain directions for narrowband array processing. The term ''spotforming'' is used to emphasize the property that point-focusing techniques with UWB waveforms can be viewed as a generalization of the well-known narrowband beamforming techniques. Because methods in spotforming can lead to powerful applications for UWB systems, in this paper we derive, simulate and experimentally verify UWB spot size as a function of frequency, bandwidth and array aperture.
Date:
February 5, 2004
Creator:
Dowla, F. & Spiridon, A.
Object Type:
Report
System:
The UNT Digital Library
The Federal Grand Jury
This report is a brief general description of the federal grand jury, with particular emphasis on its more controversial aspects—relationship of the prosecutor and the grand jury, the rights of grand jury witnesses, grand jury secrecy, and rights of targets of a grand jury investigation.
Date:
February 5, 2002
Creator:
Doyle, Charles
Object Type:
Report
System:
The UNT Digital Library
Abstract - INMM Annual Meeting 1998 Status of Underground Testing Program
This report is about the INMM Annual Meeting 1998 Status of Underground Testing Program.
Date:
February 5, 2008
Creator:
Dr. William J. Boyle, Larry R. Hayes, Alan J. Mitchell
Object Type:
Article
System:
The UNT Digital Library
Characterization of Plutonium, Neptunium, Strontium on Manganese Solids from Permanganate Reduction
This report reviews work relevant to Mn oxides and their use in radionuclide decontamination, focuses on the mechanism of radionuclide decontamination during permanganate treatment with simulant SRS HLW salt solutions and characterizes the solids that form.
Date:
February 5, 2003
Creator:
Duff, M.O.
Object Type:
Report
System:
The UNT Digital Library