Title: Mechanical responses of coated solids in elastohydrodynamically lubricated line contacts

Authors: Yangyi Xiao; Wankai Shi; Jing Luo

Addresses: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China ' State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China ' State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China

Abstract: For layered solids consisting of physical vapour deposition coatings on steel substrates in lubricated line contacts, the elastohydrodynamic lubrication (EHL) behaviour is studied by the full-system finite element approach. Numerical solutions illustrate that the coating thickness, elastic modulus, and operating conditions have significant influences upon the EHL film pressure and thickness profiles, along with the coefficient of friction. Results for stress distributions provide insight into the tendency for yielding, pitting, and interfacial delamination in coated bodies. Furthermore, the film pressure and stress status induced by the interfacial micro-valley as well as rough coating surface and interface are investigated. It is demonstrated that optimised multi-layer coatings are propitious to reduce the stress gradient and failure risks of coated materials.

Keywords: elastohydrodynamic lubrication; EHL; coating; multi-layer; mechanical response.

DOI: 10.1504/IJSURFSE.2017.088131

International Journal of Surface Science and Engineering, 2017 Vol.11 No.5, pp.450 - 487

Received: 09 Jan 2017
Accepted: 17 May 2017

Published online: 21 Nov 2017 *

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