On the dynamic interaction between moving dislocations

Document Type


Publication Date



The dynamic interaction between dislocations moving on parallel slip planes is considered. It is shown that the average interaction stress can be expressed in terms of second-order gradients of the mobile dislocation density and the logarithm of dislocation velocity. The derivation may be used as a basis for the justification of gradient-dependent plasticity models which have recently become popular in the literature on the mechanics of materials. It may also be viewed as providing additional physical insight into earlier models of gradient dislocation dynamics. Some implications of the derived gradient terms for the spatial organization and propagation of slip after yield are discussed. © Springer-Verlag 1998.

Publication Title

Applied Physics A: Materials Science and Processing