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Stiffness model of fixed joint considering self-affinity and elastoplasticity of asperities

Hongxu Chen (School of Mechanical Engineering, Sichuan University, Chengdu, China)
Qin Yin (School of Mechanical Engineering, Sichuan University, Chengdu, China)
Guanhua Dong (China Ship Development and Design Center, Wuhan, Hubei, China)
Luofeng Xie (School of Mechanical Engineering, Sichuan University, Chengdu, China)
Guofu Yin (School of Mechanical Engineering, Sichuan University, Chengdu, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Publication date: 18 September 2019

Abstract

Purpose

The purpose of this paper is to establish a stiffness model of fixed joint considering self-affinity and elastoplasticity of asperities.

Design/methodology/approach

The proposed model considers that asperities of different scales are interrelated rather than independent. For elastoplastic contact, a spring-damper model and an elastic deformation ratio function were proposed to calculate the contact stiffness of asperities.

Findings

A revised fractal asperity model was proposed to calculate the contact stiffness of fixed joint, the impacts of the fractal dimension, the fractal roughness parameter and the Meyer index on the contact stiffness were discussed, and the present experimental results and the Jiang’s experimental results showed that the stiffness can be well predicted by proposed model.

Originality/value

The contradiction between the Majumdar and Bhushan model and the Morag and Etsion model can be well explained by considering the interaction among asperities of different scales. For elastoplastic contact, elastic deformation ratio should be considered, and the stiffness of asperities increases first and then decreases with the increasing of interference.

Keywords

Acknowledgements

This research was financially supported by the National Science and Technology Major Project of China Project (grant no. 2017ZX04020001-005) and Science and Technology Support Plan Project of Sichuan Province (grant no. 2017GZ0071).

Citation

Chen, H., Yin, Q., Dong, G., Xie, L. and Yin, G. (2019), "Stiffness model of fixed joint considering self-affinity and elastoplasticity of asperities", Industrial Lubrication and Tribology, Vol. 72 No. 1, pp. 128-135. https://doi.org/10.1108/ILT-05-2019-0192

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Publisher

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Emerald Publishing Limited

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