Computer Simulation of Accelerated Modes for Faster Testing of Friction Pairs Having Solid Lubricant Coatings
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uter Simulation of Accelerated Modes for Faster Testing of Friction Pairs Having Solid Lubricant Coatings O. V. Sutyagina, * and A. A. Rachishkinb aScientific
and Innovation Center for the Operational Reliability of Mechanical Systems, Tver, 170100 Russia bTver State Technical University, Tver, 170026 Russia *e-mail: [email protected] Received February 17, 2020; revised July 2, 2020; accepted July 7, 2020
Abstract—The approach to forecasting accelerated modes for faster testing of friction pairs having solid lubricant coatings using computer simulation is examined. Load and temperature test modes under which acceleration leads to faster testing were defined. Loads and temperatures have been revealed that determine the multiple transition from predominantly elastic and elastoplastic deformation of solid lubricant coatings to a predominantly elastoplastic and plastic one, which characterizes the maximum performance of highresource friction pairs with solid lubricant coatings. Comparison of the results of the full-scale experiment and numerical experiments confirmed the correctness of the proposed method. It is shown that the ratio of elastoplastic contacting to all contacting protrusions determines the conditions under which the forcing of the modes leads to accelerated testing. Keywords: faster testing, accelerated modes, solid lubricant coatings, computer simulation, numerical testing DOI: 10.3103/S1068366620050190
INTRODUCTION Increasing demands on the reliability of mechanical systems and the introduction of new materials poses the problem of a reliable assessment of the durability of their friction pairs. Tribological properties of materials, lubricants, and coatings are evaluated at the stage of laboratory tests. Laboratory tests differ from full-scale and operational tests by idealization of their conditions and accurate registration of the investigated quantities. The results of these tests are data on the wear of rubbing bodies, the coefficient of friction, the life of the friction pair, and their dependence on the characteristics of samples, test conditions, and environmental parameters. The importance of laboratory tribotechnical tests is confirmed by the large number of standardized and non-standardized methodological recommendations regulating them and the variety of equipment used [1]. Testing under nominal conditions, as a rule, is associated with significant time expenditures; therefore, the development of methods for their acceleration is very relevant. The standard [2] regulates that in the case when accelerated tests are conducted with boosting modes, they must meet direct and indirect criteria for determining the permissible upper limit of boosting the acting factor. For friction pairs with solid lubricant coatings (SLCs), the most important are the criteria for maintaining the type of contact, the type of wear, and the moment of increase in the friction force [3]. However,
the results of laboratory tribotechnical tests are not sufficiently reproducible due to the influence on experiments of
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