Effect of criteria for inter-particle bond breaking and formation on the friction layer structure modeled by movable cellular automata.

The method of movable cellular automata (MCA) has been successfully used to simulate the mechanical behavior of materials under severe deformation conditions for over 20 years. One of the important applications of the MCA method is friction. In most of the published results obtained within the MCA method, the region where actually friction of metallic materials occurs consists of a so-called quasi-liquid layer, i.e., a mixing zone of particles detached from the base material and forming a dynamic system, where inter-particle bonds are constantly switching between two basic states: bonded and unbonded. In this work, we try to reveal the influence of the criteria of breaking and the formation of bonds between elements of the MCA method on the features of the structure formation in the friction layer for metallic materials. For this purpose, a new fracture criterion was implemented, based on the specific work of elastic-plastic deformation in the interaction point of movable cellular automata. Test calculations have shown that the use of such a criterion makes it possible to significantly expand the capabilities of the method for describing structure formation in the friction zone of metallic materials. [ABSTRACT FROM AUTHOR]