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

被引:33
作者
Hunter, A. [1 ]
Preston, D. L. [1 ]
机构
[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
关键词
Dislocations; Mean-first-passage-time (MFPT) theory; Constitutive behavior; Shock waves; CRYSTAL PLASTICITY; CONSTITUTIVE MODEL; CHEMICAL-REACTIONS; FLOW-STRESS; FCC METALS; DEFORMATION; DYNAMICS; SIMULATIONS; TEMPERATURE; DEPENDENCE;
D O I
10.1016/j.ijplas.2015.01.008
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
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.
引用
收藏
页码:1 / 29
页数:29
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