Stationary kink motion in the secondary Peierls relief

The problem of stationary kink motion in the secondary Peierls relief has been solved in a self‐consistent procedure. The radiation damping of a kink was studied as a function of its average velocity v and of the relief height. It is shown that at high velocities the kink ernits energy mainly on the basic harmonic, and that the radiation damping is proportional to 1/w. With decreasing velocity v the increase in the degree of non‐uniformity of the kink motion results in a broadening of the radiation spectrum and in the growth of the dissipation. The decrease of the velocity v is possible only up to some critical “starting” velocity below which a stationary kink motion is not realized. A dependence of the starting velocity on the relief height and kink width has been found. The phenomenon of the critical velocity is observed also under conditions of viscous dissipation. In this case the starting velocity decreases with increasing viscosity a and vanishes above some threshold value α. USSRAt α > αc the effect of the “dry friction” type is predicted: With decreasing velocity the dynamic kink damping tends to the static Peierls stress and does not vanish at v = 0. Possible display of the starting velocity effect in the experiment has been indicated.