High-speed dislocations in high strain-rate deformations

In this paper, shear deformation at high strain rates is modelled within the framework of discrete dislocation plasticity. The question is addressed whether dislocation accelerations may be ignored at high strain rates. Furthermore, the usage of high-velocity stress and displacement fields are studied. The simulations take place in a computational cell representing Al and Cu that is sheared at a strain rate of 106 s−1. The computations show that the inertial effects may not be neglected. Furthermore, although the high-velocity stress and displacement fields yield significant differences locally with respect to their quasi-static counterparts, their effect on the overall stress–strain curve is negligible.