Contact Stiffness Model of Mechanical Joint Surfaces Considering the Asperity Interactions

doi:10.3901/JME.2017.17.149

Abstract

Abstract: In order to accurately predict the contact characteristics of the two rough surfaces, in this paper, the contact problem of the rough surfaces when considering interaction between the surface asperities is studied. Based on the Saint Venant principle and the love equation, the function relationship between the local deformation quantity and the local contact load, the pressure between the joints and the material property parameters is established. After the function relationship substitution in KE model which using finite element method, put forward from the physical point of view, more stick close to the real contact state, and a numerical iterative method is proposed to solve the problem, the influence of the interaction between the asperities on the contact load, the real contact area and the contact stiffness is analyzed. The result shows, the interaction of the asperity has a significant effect on the relationship between the average distance of the two surface and the contact load, this makes it clear that the real contact area and contact stiffness of the asperity interaction KE model are obviously different with the result of KE model, and with the increase of the plastic index of rough surface, the difference is small; finally, the results of the KE and ZMC model of the asperities interaction are verified by the experimental results. The experimental analysis shows:the KE contact stiffness model of asperities interaction is more close to the experimental results.

Key words: asperity, contact stiffness, interaction, KE model, mechanical joint

CLC Number:

TG156

TIAN Xiaolong, WANG Wen, FU Weiping, GAO Zhiqiang, LOU Leiting, WU Jiebei, LI Pengyang. Contact Stiffness Model of Mechanical Joint Surfaces Considering the Asperity Interactions[J]. Journal of Mechanical Engineering, 2017, 53(17): 149-159.

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