Dynamical Dislocation Theory of Crystal Plasticity. II. Easy Glide and Strain Hardening

摘要: Mathematical descriptions of the stress‐strain‐time behavior plastic crystals are developed using a statistical approach to dislocation dynamics. First, ``easy‐glide'' portions stress‐strain curves described in terms glide band propagation. Then, three models strain hardening and used numerical calculations curves. In one model, mean density mobile dislocations first increases then decreases with increasing strain. another, introduces internal stress fluctuations which decrease velocities dislocations. third (and preferred) viscous drag acting on moving dislocations, thereby decreasing velocity at given stress. The numerically calculated show that dynamical provide realistic descriptions.