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Dislocation Density-Based Constitutive Model for the Mechanical Behavior of Irradiated Cu.

DE200415007747

Publication Date	2003
Personal Author	Arsenlis, A.; Wirth, B. D.; Rhee, M.
Page Count	44
Abstract	Performance degradation of structural steels in nuclear environments results from the development of a high number density of nanometer scale defects. The defects observed in copper-based alloys are composed of vacancy clusters in the form of stacking fault tetrahedra and/or prismatic dislocation loops, which impede dislocation glide and are evidenced in macroscopic uniaxial stress-strain curves as increased yield strengths, decreased total strain to failure, decreased work hardening and the appearance of a distinct upper yield point above a critical defect concentration (neutron dose). In this paper, we describe the development of an internal state variable model for the mechanical behavior of materials subject to these environments. This model has been developed within an information-passing multiscale materials modeling framework, in which molecular dynamics simulations of dislocation--radiation defect interactions, inform the final coarse-grained continuum model.
Keywords	Copper alloys Mechanical properties Defects Dislocations Ductility Hardening Performance Plasticity Radiations Stacking faults Steels Strain hardening Yield strength Models Irradiation
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200507

Dislocation Density-Based Constitutive Model for the Mechanical Behavior of Irradiated Cu.

Dislocation Density-Based Constitutive Model for the Mechanical Behavior of Irradiated Cu.
DE200415007747

Publication Date	2003
Personal Author	Arsenlis, A.; Wirth, B. D.; Rhee, M.
Page Count	44
Abstract	Performance degradation of structural steels in nuclear environments results from the development of a high number density of nanometer scale defects. The defects observed in copper-based alloys are composed of vacancy clusters in the form of stacking fault tetrahedra and/or prismatic dislocation loops, which impede dislocation glide and are evidenced in macroscopic uniaxial stress-strain curves as increased yield strengths, decreased total strain to failure, decreased work hardening and the appearance of a distinct upper yield point above a critical defect concentration (neutron dose). In this paper, we describe the development of an internal state variable model for the mechanical behavior of materials subject to these environments. This model has been developed within an information-passing multiscale materials modeling framework, in which molecular dynamics simulations of dislocation--radiation defect interactions, inform the final coarse-grained continuum model.
Keywords	Copper alloys Mechanical properties Defects Dislocations Ductility Hardening Performance Plasticity Radiations Stacking faults Steels Strain hardening Yield strength Models Irradiation
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200507