Modeling of Normal Contact Stiffness of Interface Considering Side Contact of Asperity

doi:10.7652/xjtuxb202202013

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Modeling of Normal Contact Stiffness of Interface Considering Side Contact of Asperity

更新时间：2025-05-08

- Modeling of Normal Contact Stiffness of Interface Considering Side Contact of Asperity
- Vol. 56, Issue 2, Pages: 118-129(2022)
- 作者机构：
  
  西安理工大学机械与精密仪器工程学院,西安,710048
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202202013
  CLC： TH113.1
- Online First：10 February 2022，
  
  Published：2022
- 稿件说明：
移动端阅览
Modeling of Normal Contact Stiffness of Interface Considering Side Contact of Asperity[J]. 2022, 56(2): 118-129.
DOI：

Modeling of Normal Contact Stiffness of Interface Considering Side Contact of Asperity[J]. 2022, 56(2): 118-129. DOI： 10.7652/xjtuxb202202013.

摘要

提出了一种考虑微凸体侧接触影响的结合面法向刚度建模方法。通过采样获取接触表面轮廓数据后

用统计方法研究了接触表面上微凸体之间的水平距离分布

发现微凸体之间的水平距离分布近似呈正态分布。基于微凸体侧接触理论和微凸体连续变形理论

建立微凸体的法向接触刚度模型后

根据微凸体水平距离的分布规律

利用统计理论

构建了结合面法向接触刚度模型。分析结果表明:在两个接触表面平均间距相同时

提出模型的法向接触载荷大于KE模型

小于高志强(GZQ)模型; 在间距较小时

提出模型接触刚度小于KE(Kogut L和Etsion I)模型接触刚度

在间距较大时

提出模型接触刚度大于KE模型接触刚度

并且提出模型的法向接触刚度总是小于GZQ模型接触刚度; 基于提出模型的有限元分析获得的前三阶模态与试验结果一致

固有频率与试验结果最大相差8.2%

说明提出的模型能够比较准确地预测结合面的法向动态特性。

Abstract

A modeling approach for the normal stiffness of the lateral contact interface considering the horizontal distance distribution between asperities is proposed. After the information of contact plane are acquired by sampling

the distribution of the horizontal distances among asperities on the contact plane are investigated statistically. It is found that the distribution of the horizontal distances among asperities is approximatly the normal distribution. Once a normal stiffness of asperities is determined based on side contact theory between asperities and continuous deformation theory of asperities

according to the distribution law of the horizontal distances between asperities

a new normal contact stiffness model of contact interface is constructed following probability and statistics theory. The simulation indicates that the normal contact load of the new model is greater than the load of KE model and less than GZQ model when the average distance between contact surfaces is given. Meanwhile

when the distance is small

the normal contact stiffness of the new model always less than that of KE model. When the distance is large

the contact stiffness of this new model is greater than that of KE model

and the normal contact stiffness of the new model is always is less than that of GZQ model. And the top three-order vibration type acquired based on the finite element simulation of the new model coincides well with the test outcome

and the maximum natural frequency error reaches 8.2%

which verifies that this newly proposed model can forecast the normal dynamic performance of the joint plane more exactly.

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references

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