Interaction of a functionally gradient ceramic coating with fixed and unfixed abrasive

The operation of plasma-electrolytic oxidation of the surface of the metals of the valve group is an effective means of parts protecting from corrosion, overheating and mechanical overloads. The purpose of the study is to analyze the stress state and limit equilibrium of oxide ceramic coatings under the action of abrasive particles. A one-dimensional mathematical model of a functionally gradient coating as a non-homogeneous plate resting on a non-homogeneous elastic Winkler foundation has been developed. The action of a hard abrasive is considered as a local load with an arbitrarily oriented force. In an analytical form, the spatial distribution of the equivalent von Mises stress is investigated. Cases of contact with fixed and unfixed abrasive are considered. Specific calculations were made for an aluminum alloy strengthened by plasma-electrolytic oxidation.