Abstract
Athermal motion of a dislocation in a lattice is studied. Using Nabarro force which represents the anharmonicity of the potential in the slip plane, a formula which describes the energy dissipated from a moving dislocation is given. Results of computer simulations of a one-dimensional dislocation are analyzed by the formula. It is shown that there are three types of motion: (i) a dislocation emits lattice waves, (ii) the displacement field around a moving dislocation is almost the same as the static one, (iii) dislocation velocity changes remarkably in the period of the lattice parameter. The boundaries between velocities of these types of motion depend strongly on the shape of the potential and damping of lattice waves. The continuum approximation is justified for the second type of motion which appears if a lattice has large damping and the low Peierls stress.
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