Numerical study of dynamical frictional phenomena based on the two-dimensional Frenkel-Kontorova model with impurities

We study numerically dynamical frictional phenomena using the Frenkel-Konto rova model with impurities. Even in the presence of randomness sliding stat es have a quasi long range order, which changes with the sliding velocity. Such an order affects the velocity dependence of the kinetic frictional for ce and produces peculiar transverse pinning effects. We discuss them in the relation with the moving Bragg glass theory developed for vortex lattices in type II superconductors.