Plastic deformation and quasi-periodic vibrations in a tribological system

A one-dimensional macroscopic model is used to analyze the plastic deformation of materials without coating and with a plastic hardening coating or a plastic nonhardening coating at friction. The calculations show that mechanical vibrations can be excited in a tribological system and that their frequency decreases sharply when going from elastic to plastic deformation. One of the causes of the development of plastic deformation in the surface layer and in the sublayer of the material under a hard coating is found to be a decrease in the elastic properties of the material because of frictional heating. An intense plastic shear in the material under the hard coating can cause its failure due to incompatible strains of the coating and the base.