Mikosianchyk O. The structural, energy and rheological indicators of lubricant layer in friction contact under non-stationery friction conditions

The thesis was solving the scientific and technical problem of the process control of self-organization in dissipative structures; minimization of wear and resource increasing of friction pairs by developing methodology for evaluation and selection of lubricants, that take into account the structural, energy and rheological indicators to reduce the intensity of accumulation of demolishing energy for contact surfaces and lubricant layer; creating the gradient of durable characteristics through the localization of the deformation processes in thin surface layer. Thermo-kinetic model was developed to assess durability of contact surfaces based on structural and energy parameters under lubrication in non-stationery friction conditions that includes methodology for assessing activation characteristics of the materials that characterize the durability of area of high-cycle fatigue and area of low-cycle fatigue debris-layer. A mathematical model was devolved to evaluate localization of the vector of the maximum shear stress in the tribosystem transition from hydrodynamic to boundary mode of lubrication. The correlation was defined for triboelements wear rate from the change of energy intensity of the contact with the structural adaptation of secondary structures based on estimates of temperature and mechanical stability of the boundary films of the lubricant and strength of materials of the contact surfaces.