Journal of Physics Condensed Matter · 2010 · 93 citations · 26 references
Natural SciencesMaterials SciencePhysicsComputational Materials ScienceMaterials CharacterizationMechanical Behavior Of MaterialsDeformation MechanismsPlastic DeformationShear StrengthStrain Rate EffectsStress-strain BehaviorX-ray DiffractionIn Situ X-ray DiffractionShear StrainShear Stress-strain BehaviorShear Stress-strain ResponseShock-wave DiffractionStress-strain RelationshipsX-ray Diffraction AnalysisX-ray Diffraction Strain Analysis
In situ x-ray diffraction has been used to measure the shear strain (and thus strength) of single crystal copper shocked to 100 GPa pressures at strain rates over two orders of magnitude higher than those achieved previously. For shocks in the [001] direction there is a significant associated shear strain, while shocks in the [111] direction give negligible shear strain. We infer, using molecular dynamics simulations and VISAR (standing for 'velocity interferometer system for any reflector') measurements, that the strength of the material increases dramatically (to approximately 1 GPa) for these extreme strain rates.
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