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Material Strength at High Pressure. LDRD Stategic Initiative. Final Report.

DE200415009805

Publication Date	2004
Page Count	14
Abstract	Various aspects of the Laboratory's national security mission are now highly dependent on accurate computer code simulations of plastic flow (i.e., non-reversible deformation) of materials under conditions of high hydrostatic pressure. Strength models are typically dependent on pressure, temperature, and strain rate. Current strength models can not be extrapolated to high pressure because they are not based on the underlying mechanisms of plastic deformation. The critical need for predictive models of material strength, which describe flow stress in computer code simulations, has motivated LLNL's multiscale modeling efforts. Over the past three years, the 'Material Strength at High Pressure' LDRD Strategic Initiative has established a framework for the development of predictive strength models for deformation of metals under conditions of high hydrostatic pressure. Deformation experiments have been developed to measure the effect of high pressure on the yield strength and work hardening behavior of high purity Mo and Ta single crystals. The over arching goal of the SI is to experimentally validate multiscale-modeling capabilities for deformation of metals under conditions of high pressure.
Keywords	Materials Strength(Mechanics) Laboratories Computer codes Metals Deformation Dislocations Flow stress Hydrostatics Monocrystals National security Physics Plasticity Plastics Computerized simulation Strain hardening Strain rate Yield strength Lawrence Livermore National Laboratory
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	California Inst. of Tech., Pasadena.; Massachusetts Inst. of Tech., Cambridge.; Pennsylvania Univ., Philadelphia.; Washington State Univ., Pullman.; Department of Energy, Washington, DC.; Lawrence Livermore National Lab., CA.
Supplemental Notes	Prepared in cooperation with Massachusetts Inst. of Tech., Cambridge., Pennsylvania Univ., Philadelphia. and Washington State Univ., Pullman. Sponsored by Lawrence Livermore National Lab., CA. and Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200517

Material Strength at High Pressure. LDRD Stategic Initiative. Final Report.

Material Strength at High Pressure. LDRD Stategic Initiative. Final Report.
DE200415009805

Publication Date	2004
Page Count	14
Abstract	Various aspects of the Laboratory's national security mission are now highly dependent on accurate computer code simulations of plastic flow (i.e., non-reversible deformation) of materials under conditions of high hydrostatic pressure. Strength models are typically dependent on pressure, temperature, and strain rate. Current strength models can not be extrapolated to high pressure because they are not based on the underlying mechanisms of plastic deformation. The critical need for predictive models of material strength, which describe flow stress in computer code simulations, has motivated LLNL's multiscale modeling efforts. Over the past three years, the 'Material Strength at High Pressure' LDRD Strategic Initiative has established a framework for the development of predictive strength models for deformation of metals under conditions of high hydrostatic pressure. Deformation experiments have been developed to measure the effect of high pressure on the yield strength and work hardening behavior of high purity Mo and Ta single crystals. The over arching goal of the SI is to experimentally validate multiscale-modeling capabilities for deformation of metals under conditions of high pressure.
Keywords	Materials Strength(Mechanics) Laboratories Computer codes Metals Deformation Dislocations Flow stress Hydrostatics Monocrystals National security Physics Plasticity Plastics Computerized simulation Strain hardening Strain rate Yield strength Lawrence Livermore National Laboratory
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	California Inst. of Tech., Pasadena.; Massachusetts Inst. of Tech., Cambridge.; Pennsylvania Univ., Philadelphia.; Washington State Univ., Pullman.; Department of Energy, Washington, DC.; Lawrence Livermore National Lab., CA.
Supplemental Notes	Prepared in cooperation with Massachusetts Inst. of Tech., Cambridge., Pennsylvania Univ., Philadelphia. and Washington State Univ., Pullman. Sponsored by Lawrence Livermore National Lab., CA. and Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200517