Abstract
The questions of the influence of the lubricant on the conditions of deformation in the contact of solids are considered. The steel spherical specimen was pressed into a greased and dry metal surface. The microstructures of the structure of the surface layer are studied under various conditions of deformation. The diagrams of the relative deformation of the surface layers are constructed. The mechanism of the formation and distribution of internal stresses for dry and greased contact is described. Experimental studies of the introduction of a moving steel indenter into a lubricated surface have been carried out. The relationship of the deformation mechanisms of lubricated surfaces with their wear resistance is determined.
 
Highlights
Most of the machines’ friction units operate in the conditions of boundary lubrication of contacting surfaces
This contributes to increased wear resistance compared to contacting surfaces without lubrication
The analysis of the deformation conditions for the lubricated contact showed that the deformation deep into the surface of the material along the axis of the deformation hole is described by a linear regularity and a non-linear one for dry contact
Summary
Most of the machines’ friction units operate in the conditions of boundary lubrication of contacting surfaces. The oscillation attenuation curve on an unordered layer of lubricant is characterized by the logarithmic law of damping These data were obtained experimentally and the study lacks a theoretical description of the mechanisms of viscous friction, which explain the results received. Authors of article [4] conducted a nonlinear regression analysis based on the results of experimental studies into the damped oscillations of a physical pendulum, which made it possible to formulate the criteria for choosing a theoretical model of the dissipation of viscous friction. 3. Methodology and research results in conditions of the static contact Experimental studies of the deformations of lubricated and dry contact were carried out by means Brinell’s test. To analyze the structure of the material in the result of deformations in a lubricated and dry contact, micrometric studies were carried out.
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