Rotational deformation modes in near-boundary regions of grain structure in a loaded polycrystal

Experiments were performed to study the defect structure formation in a thin surface layer of 20Cr18Ni10Ti steel in frictional wear. It is shown that plastic deformation constrained by a friction pair is inhomogeneous and displays a vortex rotational character. A method of excitable cellular automata is developed for a theoretical description of the formation of vortex structures in multiscale polycrystalline structures. Numerical experiments demonstrate the formation of rotational deformation modes on different structural scales-modulation of local moments of forces along the grain boundary and fragmentation of initial structural elements in initial conglomerates of self-consistently deformed grains in the field of couple stresses.