Wear in a friction pair of components of the endoprosthesis has a significant impact on its operational life. The structure of the surface layers of the contacting elements plays a key role in the wear process. To improve the tribological characteristics of metal endoprostheses, hardening nanostructured coatings are used. In this case, titanium is usually used as a metal, and titanium nitride (TiN) is used as a coating. In this paper, an approach is proposed for multiscale modeling of the friction pair of the endoprosthesis “head-acetabulum cup” based on the method of movable cellular automata. The models of materials involved in the friction pair were verified by simulating the nanoindentation process. At the micro level, the process of friction of two rough surfaces is modeled. The results of modeling at the micro level were used in the macromodel of the friction unit as the tribological characteristics of the material surface of contacting pairs after one loading cycle. To test the performance of the micro and macro models, test calculations were performed with a single cycle loading.Keywords: nanostructured coatings, indentation, pair friction, simulation, movable cellular automata method.
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