  Movement of edge (line) dislocations in FCC steel 310S is shown to depend on
the size on nanoscale structures, based on modeling withing molecular dynamics
(MD). The effect is attributed to time (and size) dependencies of pressure
propagation into the medium interior. The observation is crucial in
interpreting any MD studies of pressure effects since these are governed by
time-dependent internal virial stresses. In particular velocity of dislocations
scales well with value of local internal shear component of virial stress
$S_{xy}$ and not with external shear pressure. Dynamics of stress penetration
is described well within the model of damped harmonic oscillator, where
characteristic oscillation frequency depends on number of crystallographic
layers in direction along the wave propagation while the speed of stress
propagation is the speed of sound. The minimal stress required for dislocation
movement (Peierls stress) is determined to be 0.75 GPa. Pressure and
temperature effects on dislocation movement are systematically investigated.
