FORECASTING OF THE MAXIMUM LINEAR WEAR OF CONTACT SURFACES IN EXTREME FRICTION CONDITIONS
Journal Title: Проблеми тертя та зношування - Year 2018, Vol 81, Issue
Abstract
The influence of the contact voltage on the tribotechnical properties of lithium lubrica-tions under unsteady friction conditions at the termination of the supply of lubricant to the contact zone is analyzed. The interrelation between the intensification of destructive changes in the boundary layer of a lubricant and deformation changes of thin surface metal layers is established. These processes cause an increase in the energy density of the tribocontact and an increase in the wear of the contact surfaces. An empirical dependence of the linear wear of the contact surfaces under extreme friction conditions is obtained, taking into account the influ-ence of the contact load, the specific work of friction and the thickness of the lubricant layer. The studies were conducted on samples of steel 30ХГСА (HRC 35) under conditions of lubri-cation of the surface with lithium greases based on Aero Shell Grease 33 and Ера ВНІІНП - 286М. Aero Shell Grease 33 is characterized by more efficient lubricating properties, and its synthetic components with rheological characteristics are more stable to an increase in the shear rate gradient, compared to the components of Ера ВНІІНП -286M lubricant. The destruction of a lubricating film under friction is one of the leading factors determining the intensification of the energy processes occurring in the contact zone. First of all, this is manifested in the violation of the structural adaptability of the contact surfaces and the lubricant in critical conditions of friction, the destruction of previously formed metastable structures. The transition of the tribosystem to the thermodynamically unstable state is characterized, first of all, by a sharp activation of the metal due to the concentration of stresses in the local areas of the frictional contact at the places of destruction, which shields the lubricant film, manifested in an increase in the specific work of friction. It was established experimentally that the lubricant Aero Shell Grease 33 is characterized by more effective anti-wear properties, compared to the lubricant Ера ВНІІНП-286M of similar operational purpose.
Authors and Affiliations
R. G. MNATSAKANOV, O. A. MIKOSIANCHYK, O. Ye YAKOBCHUK, V. V. TOKARUK
Keywords
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