A statistical model of elastic-plastic contact between rough surfaces
A statistical model of elastic-plastic contact between rough surfaces
复制标题
粗糙表面弹塑性接触统计模型
DOI：
10.1139/tcsme-2017-0052
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发表时间：
2019-03
影响因子：
0.9
通讯作者：
Han Qing kai
中科院分区：
文献类型：
--
作者：
Zhao Guang;Li Sheng xiang;Xiong Zhi liang;Gao Wen dong;Han Qing kai
在机械界面中，接触表面形貌对接触刚度有重要影响。在微凸体的接触过程中，弹塑性变化会导致临界接触点处的不连续性和不光滑性。结果是在弹塑性变形和实际粗糙变形之间有很大的差异。根据赫兹接触理论，粗糙表面上的微凸体高度服从高斯分布。考虑到微凸体弹塑性变形的连续性，将微凸体的弹塑性变形分为弹塑性前、弹塑性中、弹塑性后三个阶段。建立了连续临界点处微凸体的弹塑性接触模型。单个微凸体的接触模型与Kogut-Etsion模型和Zhao-Maietta-Chang模型拟合较好，且变化趋势一致。在较低的塑性指数下，本模型与经典的接触面积和接触载荷模型相吻合。在较高塑性指数下，本模型的模拟结果与Greenwood-Williamson模型和Chang-Etsion-Bogy模型的模拟结果不同，但与Kogut-Etsion模型和Zhao-Maietta-Chang模型的模拟结果相似。该研究为粗糙表面的微观接触模型提供了更精确的描述，为界面设计和分析提供了理论框架。
In a mechanical interface, the contact surface topography has an important influence on the contact stiffness. In the contact processes of asperities, elastic-plastic change can lead to discontinuity and lack of smoothness at a critical contact point. The result is a large difference between the elastic-plastic deformation and the actual asperity deformation. Based on Hertz contact theory, the heights of asperities on a rough surface obey a Gaussian distribution. To take into consideration the continuity of elastic-plastic asperity deformation, we divide the elastic-plastic deformation into three stages: pre-elastic-plastic, mid-elastic-plastic, and post-elastic-plastic deformation. This establishes an elastic-plastic contact model of asperity at a continuous critical point. The contact model of a single asperity fits well with the Kogut–Etsion model and the Zhao–Maietta–Chang model, and the variation trend is consistent. At a lower plastic index, the present model coincides with classical models of contact area and contact load. At a higher plastic index, the simulation results of the present model differ from the Greenwood–Williamson model and the Chang–Etsion–Bogy model but are similar to results from the Kogut–Etsion and Zhao–Maietta–Chang models. This study provides a more accurate microscopic contact model for rough surfaces and a theoretical framework for interface design and analysis.
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影响因子：
2.5
作者：
Zhao, YW;Maietta, DM;Chang, L
通讯作者：
Chang, L
影响因子：
6.2
作者：
Jackson, Robert L.;Green, Itzhak
通讯作者：
Green, Itzhak
DOI：
10.1098/rspa.1966.0242
发表时间：
1966-01-01
影响因子：
--
作者：
GREENWOOD, JA;WILLIAMSON, JB
通讯作者：
WILLIAMSON, JB
影响因子：
2.5
作者：
Li Lin;J. Lin
通讯作者：
Li Lin;J. Lin
影响因子：
2.1
作者：
Kogut, L;Etsion, I
通讯作者：
Etsion, I