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The elastic loading behaviour of rough surfaces is derived based on the physical understanding of the contact phenomena, where the pressure distribution is analytically obtained without any negative values or convergence problems, thus the evolution of the contact behaviour is obtained in a semi-analytical manner. Numerical results obtained by the proposed approach facilitate the understanding of the contact behaviour in the following aspects: 1) the ratio of contact area to load decreases with an increase in real contact area; 2) normal approach-load relationship is approximated by an exponential decay under relatively small loads and a linear decay under relatively large loads; and 3) average gap shows an exponential relationship with load only in moderate load range.


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A semi-analytical approach to the elastic loading behaviour of rough surfaces

Show Author's information Xiaogang ZHANG1Yali ZHANG1( )Zhongmin JIN1,2,3
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Schoolof Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK

Abstract

The elastic loading behaviour of rough surfaces is derived based on the physical understanding of the contact phenomena, where the pressure distribution is analytically obtained without any negative values or convergence problems, thus the evolution of the contact behaviour is obtained in a semi-analytical manner. Numerical results obtained by the proposed approach facilitate the understanding of the contact behaviour in the following aspects: 1) the ratio of contact area to load decreases with an increase in real contact area; 2) normal approach-load relationship is approximated by an exponential decay under relatively small loads and a linear decay under relatively large loads; and 3) average gap shows an exponential relationship with load only in moderate load range.

Keywords: surface roughness, real contact area, interfacial stiffness, normal contact stiffness

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Publication history

Received: 21 March 2019
Revised: 10 June 2019
Accepted: 28 July 2019
Published: 05 December 2019
Issue date: October 2020

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© The author(s) 2019

Acknowledgements

The authors acknowledge the financial supports by the National Key Research and Development Program of China (2016YFF0204305), the National Natural Science Foundation of China (51775460 and 51905456), and the China Postdoctoral Science Foundation (2019M653836XB).

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