Analytic model of the remobilization of pinned glide dislocations from quasi-static to high strain rates

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.