Calculation method for contact stiffness of contact surface based on multi-scale plastic index model

被引：0
作者：
Zhao Y. [1 ,2 ]
Niu N. [1 ,2 ]
Yang C. [1 ,2 ]
Liu Z. [1 ,3 ]
Jiang K. [1 ,3 ]
Meng L. [1 ,3 ]
机构：
[1] Institute of Advanced Manufacturing and Intelligent Technology, Beijing University of Technology, Beijing
[2] Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing
[3] Mechanical Industry Key Laboratory of Heavy Machine Tool Digital Design and Testing, Beijing University of Technology, Beijing
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2022年 / 41卷 / 03期
关键词：
Contact stiffness; Contact surface; Fractal theory; Frequency ordinal number; Plastic index;
D O I：
10.13465/j.cnki.jvs.2022.03.014
中图分类号：
学科分类号：
摘要：
Contact characteristics of bolt connection contact surface are the key to affect dynamic and static characteristics of mechanical system. When a contact surface is in vibration fatigue state, it can cause increase in damping and decrease in resonance frequency. Therefore, establishing an accurate contact model of bolted contact surface is of great significance to study dynamic characteristics of the whole machine tool. Here, combined with the plastic index expression, statistical roughness parameters and fractal parameters given by Greenwood and Williamson, a plastic index model related to frequency ordinal number of micro-convex body was established. According to the plastic index, the critical frequency ordinal number of elastic-elastoplastic-plastic deformation of micro-convex body was obtained. Based on Hertz contact theory, the contact load and contact stiffness of the whole contact surface were obtained through integrating the micro-convex body within different frequency intervals. Finally, the correctness of the theoretical model was verified through the combination of finite element simulation and tests. It was shown that the theoretical model described above has stronger engineering application value. © 2022, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：115 / 122and164
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