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Vol.25, No.3, 2025, pp. 399–404 |
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INFLUENCE OF LUBRICANT CONTAMINATION ON BALL BEARING RATING LIFE Ivan Shatskyi1*
1) Laboratory of Modelling of Damping Systems, Institute for Applied Problems in Mechanics and Mathematics, NAS of Ukraine, Ivano-Frankivsk, UKRAINE I. Shatskyi https://orcid.org/0000-0003-0223-038X , *email: ipshatsky@gmail.com M. Makoviichuk https://orcid.org/0000-0003-4202-1953 2) National University ‘Zaporizhzhia Polytechnic’, Zaporizhzhia, Ukraine I. Lazariev https://orcid.org/0009-0002-1780-1464 3) Department of Computerized Engineering, Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine L. Ropyak https://orcid.org/0000-0002-9374-2550
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Abstract The purpose of the paper is to analyse the stress state and the limit equilibrium of oxide ceramic coatings under action of abrasive particles. 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 plane strain conditions. In an analytical form, the spatial distribution of the equivalent von Mises stress and factor of safety are investigated. Cases of contact of the coating with fixed and unfixed abrasive are considered. Specific calculations are made for an aluminium alloy strengthened by plasma-electrolytic oxidation and for ceramics formed on aluminium sputtered onto a steel part. It is shown that the interaction of the coating with a fixed abrasive is always more dangerous than with an unfixed one. Keywords: • ceramic coating • abrasive • local load • stressed state |
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