High-speed dislocations in high strain-rate deformations

In this paper, shear deformation at high strain rates is modelled within th e framework of discrete dislocation plasticity. The question is addressed w hether dislocation accelerations may be ignored at high strain rates. Furth ermore, the usage of high-velocity stress and displacement fields are studi ed. The simulations take place in a computational cell representing Al and Cu that is sheared at a strain rate of 10(6) s(-1). The computations show t hat the inertial effects may not be neglected. Furthermore, although the hi gh-velocity stress and displacement fields yield significant differences lo cally with respect to their quasi-static counterparts, their effect on the overall stress-strain curve is negligible. (C) 2001 Elsevier Science B.V. A ll rights reserved.