Physical theory of the dynamic yield point of crystalline materials

Abstract

1. The model of viscous damping of high-velocity dislocations leads to a realistic description of the observed macroscopic phenomena during the initial stages of plastic flow of crystalline materials at high deformation rates. It can therefore be asserted that subbarrier dislocation motion makes the primary contribution to plastic flow during these stages of deformation. 2. Data on the damping of elastic shock waves in materials are quantitatively consistent with the damping constant determined by different methods (including the damping of ultrasound). Therefore, data on the damping of elastic shock waves can be used as an independent method for evaluating the ratio of the constant for viscous damping of dislocations to the density of moving dislocations (B/N).