Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 70, Issue -, Pages 1-29Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2015.01.008
Keywords
Dislocations; Mean-first-passage-time (MFPT) theory; Constitutive behavior; Shock waves
Funding
- Advanced Simulation and Computing (ASC) - Physics and Engineering Models (PEM) Program at Los Alamos National Laboratory (LANL)
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In this paper, we construct an analytic model describing mobile-immobile dislocation intersections using a mean-first-passage-time (MFPT) framework. By applying MFPT theory to dislocation intersection, the deformation mechanics at high strain rates is more reliably described than in traditional models based on Van't Hoff-Arrhenius thermal activation. The plastic strain rate is expressed as a function of the applied stress, mobile and immobile dislocation densities, material density, and temperature. This kinetic equation is applicable at strain rates from quasi-static to rates in excess of 1012 s(-1), pressures from ambient to about 1000 GPa, and temperatures ranging from zero to the melt temperature. Published by Elsevier Ltd.
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