Assessment of the stress-strain state of the destructured protective coating of a threaded pipe under the contact action of a deformable obturating element

The article presents a study of the stress-strain state of the destructured protective coating of the channel surface of a threaded pipe during the contact action of a deformable obturating element forming on the conical section of the pipe channel and its transition to a cylindrical part. The relevance of the study is due to the need to build a quantitative model of the destruction of the coating, which begins precisely from this site. The above study complements the model of the destruction of a thermoprotective coating by a stream of high-temperature gases constructed by the authors, taking into account the decisive mechanism describing the fatigue failure of coatings under conditions of their repeated high-temperature and force loading by a stream of combustion products and contact forces.