A Fractal Model for Lateral Contact of Joint Considering Contact Angle Distribution Between Asperities

被引：0
|
作者：
Wang S. [1 ]
Liu X. [1 ]
Fan L. [1 ]
Cui S. [1 ]
Li P. [1 ]
机构：
[1] School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2023年 / 57卷 / 12期
关键词：
contact angle distribution; contact stiffness; fractal model; lateral contact;
D O I：
10.7652/xjtuxb202312019
中图分类号：
学科分类号：
摘要：
Aiming at the problem that the lateral contact and the source of contact angle distribution between asperities are ignored in the existing fractal models, a lateral fractal model of contact stiffness of joint considering the contact angle distribution between asperities was proposed. The profile of the contact surfaces was obtained by the profile microscope, and the surface profiles were modeled by the three-point peak method to obtain the data of the horizontal distance and height difference between adjacent asperities. The analysis results based on power spectral density method show that the horizontal distances and height differences between adjacent asperities have fractal laws. According to the discovered fractal law, the distribution function law of contact angle is derived when two asperities contact with each other, then the contact stiffness model of joint is established by the fractal theory. Based on this model, the effects of fractal parameters, plastic index, normal load coefficient, and contact mode on the normal and tangential contact stiffness were studied through the numerical simulation. The results indicate that the dimensionless tangential contact stiffness increases with the fractal dimension, plastic index, and normal load coefficient, while decreases as the fractal scale parameter increases. Comparing the results of finite element analysis and modal experiment, it is found that the absolute value of the maximum relative error is 4. 32%, and the accuracy is 46. 80% higher than that of the LZT model, which illustrates that this model can accurately predict the contact stiffness of joint. © 2023 Xi'an Jiaotong University. All rights reserved.
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页码：190 / 200
页数：10
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