  Numerical simulation of the dislocation motion in 2D Frenkel - Kontorova (FK)
model in the thermostat shows an unusual dynamical behavior. It appears that
''kink'' regime of dislocation gliding takes place in a certain region of
parameters of the model but, in disagreement with the common views about the
dislocation motion under plastic deformation condition, the kinks appear to be
similar to sine-Gordon solitons despite the discreteness of the lattice,
damping and thermal fluctuations. At high enough stresses and temperatures the
motion of the dislocation is accompanied by its oscillations rather than kink
nucleation.
