Simulations were performed of dislocation loop emission by a Frank-Read source, and of their evolution in a field of randomly distributed point obstacles having a discrete strength spectrum. The obstacles and their strengths were interpreted as being the intersections of a dislocation loop with the base plane of the source. It was observed that, behind the front of an expanding dislocation segment, there remained islands of incomplete crystallographic slip. These were so-called hard-to-overcome regions of the glide plane, which dislocations by-passed via the Orowan mechanism. The dynamic effects which were associated with the pinching-off of a loop from a dislocation bounding the region of expanding crystallographic glide were considered. These effects had to be taken into account when describing the emission spectrum that accompanied plastic deformation.

Dislocation Loop Evolution from a Source in a Field of Randomly Distributed Obstacles with a Discrete Strength Spectrum. M.I.Slobodskoi, A.V.Matyushchenko: Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, 1997, 40[7], 113-8 (Russian Physics Journal, 1997, 40[7], 696-700)