Model of accumulation of tribo damage in high-speed friction

Abstract

A model of the wear of bodies at high friction speeds in a probabilistic setting is proposed. The model is based on the thermokinetic theory of destruction of materials. The identification of the parameters of the wear models was carried out taking into account the random nature of the influencing factors. The model is presented in discrete form and adapted for numerical simulation using a step-by-step discrete calculation algorithm. As a result, it was found that the stress state of the surface layer of the parts of the tribosystem and, accordingly, wear significantly depend on the kinetics of the change in the coefficient of sliding friction during the transition from static to dynamic loading. It is proposed to use the kinetics of variation of the coefficient of friction to assess the effectiveness of using methods to increase the durability of tribosystems under conditions of high sliding speeds. As a result of the presented studies, a laboratory experiment was conducted to study the influence of the friction coefficient and relative sliding speed on the wear processes of samples from various materials. Experimental data confirm that the coefficient of change of the coefficient of friction is sensitive to the technology of formation of the surface layer