The sweeping of a dipolar loop by a glide dislocation in a PSB channel

Abstract

The sweeping of small dipolar loops by a gliding dislocation is thought to be the main mechanism responsible for dislocation pattern formation during cyclic deformation. The present work extends a previous investigation where the individual sweeping event was calculated within the framework of isotropic linear elasticity for an infinite straight gliding dislocation and a rigid dipolar prismatic loop, Here, the motions of a flexible glide dislocation segment and a rigid loop of finite dimension are considered under stress in the channel of an idealized wall structure, The shape of the dislocation segment as well as the behavior of the dipolar loop is obtained from the numerical solution of the equations of motion and balance of forces for the two defects.