Asperity model construction and contact characteristics analysis of rough surfaces

被引：0
|
作者：
Li L. [1 ]
He B. [1 ]
Wang J. [1 ]
Zhang J. [1 ]
Cai A. [1 ]
机构：
[1] School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2023年 / 42卷 / 02期
关键词：
contact model; contact stiffness; parameters of asperity; rough surface; surface topography;
D O I：
10.13465/j.cnki.jvs.2023.02.006
中图分类号：
学科分类号：
摘要：
A method using the equivalent asperity of a quadratic rotating body was proposed based on rough surface topography measurement experiments. The analytical relationship between the contact radius and the contact deformation of the asperity was established, which makes up the defect of using a single radius of curvature in the hemisphere model. Then, the contact expressions of a single asperity in three deformation stages of elastic, elastoplastic and fully plastic were deduced by virtue of the geometric model. The microscopic contact model of the rough surface was established based on the theory of contact mechanics and statistical methods. Finally, the simulation results by the model were compared with those by the CEB model, ZMC model and KE model to verify the validity of the model proposed. Furthermore, the influences of plasticity index and asperity size parameters on contact characteristics were revealed. The results show that the quadratic function model is better than the hemisphere model in fitting the contour of the asperity. The model can more accurately analyze the contact characteristics of the joint surface under higher loads. Additionally, the plasticity index is the main factor affecting the contact stiffness, and the contact area decreases with the increase of the plasticity index, resulting in a weaker ability to resist deformation. The influence of asperity size parameters on contact stiffness is relatively small, and the contact area and contact stiffness increase with the increase of the ratio of asperity diameter to height. © 2023 Chinese Vibration Engineering Society. All rights reserved.
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页码：43 / 50
页数：7
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