It was recalled that a dislocation which was moving through a lattice emitted elastic waves, as it accelerated or decelerated, due to the lattice periodicity. Simulations of these phenomena were carried out here for a 2-dimensional discrete square lattice. It was found that, under a small applied stress, dislocation motion from an unstable position to the next stable position was associated with the emission of dipolar waves. This was followed by quadrupolar emission when it oscillated around the stable position. When the applied stress exceeded 70% of the Peierls stress, the dislocation overcame the Peierls barriers and, after travelling a few atomic spacings, it attained steady motion; with the alternation of forward motion with oscillation or halting, and the radiation of dipolar and quadrupolar waves.

Emission of Elastic Waves from a Dislocation in a 2D Discrete Lattice. H.Koizumi, H.O.K.Kirchner, T.Suzuki: Materials Science and Engineering A, 2001, 309-310, 117-20