A two-dimensional computational methodology for high-speed dislocations inhigh strain-rate deformation

In this paper, shear deformation at high strain rates is modeled within the framework of discrete dislocation plasticity. The total stress and deforma tion state is split into the state due to the dislocations in an infinite m edium and the complementary image field, which is enforced by a finite elem ent solution. The stress and displacement fields for highspeed dislocations are used, as well as a velocity-dependent drag coefficient. Sources and ob stacles are put into the material, and constitutive rules are implemented f or the creation and annihilation of dislocations. A novel criterion is intr oduced according to which the properties are projected into the two-dimensi onal (2D) domain of simulation. The question is addressed whether it is all owed to neglect accelerations, as is done in simulations at lower deformati on rates. (C) 2001 Elsevier Science B.V. All rights reserved.