About the article
V.V. IZMAILOV, Dr. Sc., M.V. NOVOSELOVA, Cand. Sc.
An empirical formula is proposed to describe the dependence of the hardness (microhardness) of the material H on the depth h, which is a consequence of hardening during the processing of a part or the use of hardening technology. The formula contains two empirical parameters characterizing the degree of hardening of the material and the thickness of the hardened layer. The proposed analytical dependence H(h) made it possible to generalize the well-known in tribology Archard’s equation, which relates the wear rate to the hardness of the material of the wear part, to the case of contact of parts with a hardness variable over the depth of the material. Based on the generalized Archard’s equation, a formula was obtained for quantitative prediction of the frictional interface resource by the criterion of admissible linear wear. The quantitative assessment of the resource is the maximum value of the friction path. The influence of the parameters of the hardened layer on the estimation of the value of the frictional coupling resource and its error arising when determining the resource without taking into account the hardening of the surface layer is analyzed. It is shown that this error can be significant, especially for a significant degree of hardening.
friction, wear, surface hardening, resource, prediction.