On a model for the prediction of asperity interactions of the coated friction pair
Industrial Lubrication and Tribology
ISSN: 0036-8792
Article publication date: 18 October 2019
Issue publication date: 6 April 2020
Abstract
Purpose
Surface coatings have been introduced on the contact surfaces to protect the mechanical parts for a long time. However, in terms of the optimum design of coatings, some key coating parameters are still selected by trial and error. The optimum design of coatings can be conducted by numerical experiments. This paper aims to predict the contact behavior of the coated rough surfaces accurately. One improved asperity contact model for the coated rough surfaces considering the misalignment of asperities would be developed.
Design/methodology/approach
Incorporating the coated asperity contact model into the improved Greenwood Tripp-based statistical approach, the proposed model can predict the elastic-plastic behaviors of the interacting coated asperities.
Findings
According to numerical experiments, compared with the coated asperity contact model in which an equivalent rough surface against a plane is assumed, the improved asperity contact model for the coated contacts can account for the effect of permitting misalignment of two rough surfaces. The contacts having the thicker, stiffer and harder coatings result in higher asperity contact pressure and smaller real contact area fraction under the given Stribeck oil film ratio.
Originality/value
In this paper, one statistical coated asperity contact model for two rough surfaces was developed. The developed model can consider the elastic-plastic behavior of interacting coated asperities. The effects of the coating thickness and its mechanical properties on the contact behavior of the rough surfaces with coatings can be evaluated based on the developed model.
Keywords
Acknowledgements
This study is sponsored by Shanghai Sailing Program (No. 19YF1434500), the National Natural Science Foundation of China (No. 51875344) and the key project supported by the Science and Technology Committee of Shanghai Municipal (STCSM, No. 18060502400).
Citation
Gu, C. and Wang, S. (2020), "On a model for the prediction of asperity interactions of the coated friction pair", Industrial Lubrication and Tribology, Vol. 72 No. 3, pp. 449-454. https://doi.org/10.1108/ILT-06-2019-0232
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited