Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 131, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2020.102750
Keywords
Dislocations; Shock waves; Constitutive behavior; Crystal plasticity; Analytic functions; Drag coefficient
Funding
- U.S. Department of Energy [89233218CNA000001]
- Materials project within the Advanced Simulation and Computing, Physics and Engineering Models Program
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In this paper we discuss the effect of a non-constant dislocation drag coefficient on the very high strain rate regime within an analytic model describing mobile-immobile dislocation intersections applicable to fcc polycrystals. Based on previous work on dislocation drag, we estimate its temperature and pressure dependence and its effects on stress-strain rate relations. In the high temperature regime, we show that drag can remain the dominating effect even down to intermediate strain rates. We also discuss the consequences of having a limiting dislocation velocity, a feature which is typically predicted by analytic models of dislocation drag, but which is somewhat under debate because a number of MD simulations predict supersonic dislocations.
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