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Research Article | Open Access

Combined effect of boundary layer formation and surface smoothing on friction and wear rate of lubricated point contacts during normal running-in processes

Yazhao ZHANG, Alexander KOVALEV, Yonggang MENG( )
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
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Abstract

The combined effect of boundary layer formation and surface smoothing on friction and wear rate of metallic surfaces under lubricated point contact condition was investigated. The double trend of friction coefficient variations was revealed during running-in and sub-running-in processes. The evolution of surface topography was measured on-site using white-light interference profilometer and analyzed using bearing area curves. Comprehensive theoretical equations that explicitly express the contributions of boundary friction, adhesive friction and wear have been derived, and results obtained by these equations were compared with experimental observations. It is concluded that the theoretical models are quantitatively adequate to describe the combined effect of surface smoothing due to mechanical wear and formation of boundary films on the changes in friction and wear rate during normal running-in processes.

Keywords

running-inbearing area curvesfriction modelingwear modelingmixed lubrication

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Friction
Volume 6 Issue 3,
September 2018
Pages 274-288
DOI: 10.1007/s40544-018-0228-4

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ZHANG Y, KOVALEV A, MENG Y. Combined effect of boundary layer formation and surface smoothing on friction and wear rate of lubricated point contacts during normal running-in processes. Friction, 2018, 6(3): 274-288. https://doi.org/10.1007/s40544-018-0228-4

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Received: 05 April 2018
Revised: 26 June 2018
Accepted: 29 June 2018
Published: 06 September 2018
© The author(s) 2018

This article is published with open access at Springerlink.com

Open Access: The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.