Energy analysis of wear sliding friction units

Abstract

This article deals with the calculation of friction and wear of working surfaces of sliding friction units on the basis of energy theory. Working surfaces have roughness, i.e., protrusions and depressions, which under the influence of load and as a result of slip undergo plastic deformation, as a result of which the roughness of contacting surfaces changes and differs from the initial one, which is called equilibrium roughness. Profilograms of surfaces with equilibrium roughness showed that their protrusions have approximately the same height and large rounding radii, which causes a large contact area of the mating friction surfaces. The intensity of wear of the friction pair depends largely on the normal load on the contact areas. If the contact stress does not exceed the yield strength of the tooth material, the wear of the friction surfaces occurs without seizure, if the yield strength of the material is exceeded, seizure may occur. The process of separation of wear products during meshing operation has a cyclic nature and occurs after a certain number of repeated deformations. The obtained results allow calculating the amount of wear of sliding friction surfaces [1].

Keywords

• energy theory of wear
• abrasion resistance
• friction forces
• wear
• friction coefficient
• elastic deformation
• abrasive wear
• protective layer