Molecular-dynamics study of the features of dynamic vortex structure formation in a material with micropores under high-rate deformation conditions

The response of a material containing a system of micropores subjected to high-rate shear deformation has been computer-simulated by methods of molecular dynamics. Deformation of such materials is accompanied by the formation of vortexlike dynamic defects. This process can be divided into three stages. The first stage is characterized by a predominating laminar character of atomic displacements in the regions adjacent to the loaded layers. A special feature of the second stage is the development of a correlated vortexlike motion of atoms in the regions between micropores, with periodic formation and breakage of vortices in a period on the order of several picoseconds. The third stage is related to the loss stability of the atomic structure and the formation of deformation localization bands. This is accompanied by the loss of correlation of the vortexlike motion of atoms in the regions between micropores. The results can be used in analyzing the behavior of materials under conditions involving irradiation.