A dislocation dynamics model, based upon the elasticity treatment of dislocations with self-stress effects included, was used to investigate the critical applied stress required for a gliding dislocation to overcome the stress field of a row of sessile loops near to the glide plane. The critical stress was determined for wide ranges of loop size, spacing and distance from the glide plane. Various approximations to the loop distribution were tested, including an edge dipole, a single dislocation and a row of infinitesimal loops. The infinitesimal loop model, in particular, was shown to give good agreement with accurate simulation data over a wide range of loop size and spacing. The ranges of applicability were compared with previous treatments in which such approximations were used to investigate the hardening due to dislocation-loop interactions.

Dislocation Dynamics Modelling of Dislocation-Loop Interactions in Irradiated Metals. Z.Rong, V.Mohles, D.J.Bacon, Y.N.Osetsky: Philosophical Magazine, 2005, 85[2-3], 171-88