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A numerical study on the contact fatigue life of a coated gear pair under EHL

Ye Zhou (State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China)
Caichao Zhu (State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China)
Huaiju Liu (State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China)
Chaosheng Song (State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China)
Zufeng Li (State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 8 January 2018

353

Abstract

Purpose

Coatings are widely used in gears to keep interface from wearing excessively. The purpose of this paper is to study the effect of coating properties and working conditions on the pressure, the shear traction, stresses as well as the fatigue life of spur gear.

Design/methodology/approach

A numerical contact fatigue life model of a coated spur gear pair under elastohydrodynamic lubrication (EHL) is developed based on the characteristics of gear geometry and kinematics, lubrication conditions and material properties. Frequency response functions and the discrete convolute and fast Fourier transform (DC-FFT) algorithm are applied to obtain elastic deformation and stress. Mutil-axial fatigue criteria are used to evaluate the contact fatigue life based upon the predicted time-varying stress fields of coated bodies.

Findings

The maximum Mises stress decreases while the fatigue life increases as the coating modulus decreases. A thinner coating leads to a longer life and a smaller maximum Mises stress for hard coatings. The load has more significant effect on the contact fatigue life of soft coatings.

Originality/value

The developed model can be used to evaluate the contact fatigue life of coated gear under EHL and help designers analyze the effect of coating elastic modulus and thickness on the contact pressure, film thickness and stress.

Keywords

Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (No. 51575061, 51535012, 51775060).

Citation

Zhou, Y., Zhu, C., Liu, H., Song, C. and Li, Z. (2018), "A numerical study on the contact fatigue life of a coated gear pair under EHL", Industrial Lubrication and Tribology, Vol. 70 No. 1, pp. 23-32. https://doi.org/10.1108/ILT-10-2016-0256

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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