Effects of inhomogeneity on rolling contact fatigue life in elastohydrodynamically lubricated point contacts

Abstract

Purpose

This paper aims to investigate the effects of inhomogeneities on the rolling contact fatigue (RCF) life in elastohydrodynamically lubricated (EHL) point contacts.

Design/methodology/approach

A numerical model for predicting the RCF life of inhomogeneous materials in EHL contacts was established by combining the EHL model and the inclusion model through the eigen-displacement and then connecting to the RCF life model through the subsurface stresses. Effects of the type, size, location and orientation of a single inhomogeneity and the distribution of multiple inhomogeneities on the RCF life were investigated.

Findings

The RCF life of a half-space containing manganese sulfide (MnS) inhomogeneity or the mixed inhomogeneity of aluminium oxide (Al₂O₃) and calcium oxide (CaO) was longer than that for the case of Al₂O₃ inhomogeneity. For a single ellipsoidal MnS inhomogeneity, increases of its semi-axis length and decreases of its horizontal distance between the inhomogeneity and the contact center shortened the RCF life. Furthermore, the relationship between the depth of a single MnS inhomogeneity and the RCF life was found. For the half-space containing multiple inhomogeneitites, the RCF life decreased remarkably compared with the homogeneous half-space and showed discreteness.

Originality/value

This paper implements the prediction of the RCF life of inhomogeneous materials under EHL condition.

Citation

Zhang, Y., Yan, X., Zhang, X., Li, J. and Cheng, F. (2019), "Effects of inhomogeneity on rolling contact fatigue life in elastohydrodynamically lubricated point contacts", Industrial Lubrication and Tribology, Vol. 71 No. 5, pp. 697-701. https://doi.org/10.1108/ILT-01-2019-0029