Tensile deformation of single-crystal copper along  orientation is modeled. Single
crystal is deformed at three sets of high strain rates, ranging from 103 to 105 s−1, using the three-dimensional dislocation dynamics technique to simulate dislocation
microstructure evolution and the resultant macroscopic response. Two initial dislocation
configurations consisting of straight dislocations and Frank–Read sources are randomly
distributed over the simulation volume with an edge length of 1 μm. For both initial
setups, the mechanical response of the single crystal to the external loading demonstrates
a considerable effect of strain rate. In addition, strain rate influences dislocation
density evolution and consequently development of the dislocation microstructure.
At all applied strain rates for both initial dislocation setups, dislocations evolve
into a heterogeneous microstructure and this heterogeneity increases with plastic
strain and strain rate.