双粗糙平面法向接触建模方法的有限元对比分析

发布时间：2018-05-22 14:57

本文选题：双粗糙模型 + 单粗糙模型　；参考：《润滑与密封》2017年11期

【摘要】：基于统计学方法,Greenwood和Tripp(GT模型)提出双粗糙平面法向接触(双粗模型)可以等效为单粗糙平面与刚性平板之间的接触(单粗模型),但这种等效处理缺乏对接触应力场分析以及材料硬化的考虑。为进一步研究GT模型,基于高斯粗糙表面数字化表征,通过控制自相关长度和滤波方法,得到双粗糙平面及其等效单粗糙平面;借助有限元软件ABAQUS对2组模型法向接触进行建模及分析。结果表明:2组模型预测的接触刚度和接触面积符合较好,但接触压力与接触面积关系存在差异;2组模型预测的等效应力和接触压强的应力幅值以及云图的分布区域大致相近,但双粗模型由于存在大量微凸体侧接触,弱化接触状态以及材料硬化,因而应力幅值偏低。
[Abstract]:Based on the statistical methods of Greenwood and Tripp(GT models, it is proposed that the double rough plane normal contact (double rough model) can be equivalent to the contact between a single rough plane and a rigid plate (a single rough model), but this equivalent treatment lacks the contact stress. Field analysis and consideration of material hardening. In order to further study the GT model, based on the digital representation of Gao Si rough surface, the double rough plane and its equivalent single rough plane are obtained by controlling the autocorrelation length and filtering method. Two groups of normal contact models were modeled and analyzed by finite element software ABAQUS. The results show that the contact stiffness and contact area predicted by the two groups of models are in good agreement, but the relationship between contact pressure and contact area is different. The stress amplitude of equivalent stress and contact pressure predicted by two groups of models and the distribution region of cloud map are approximately similar. However, due to the existence of a large number of micro-convex body side contact, weakening contact state and material hardening, the stress amplitude of the double coarse model is low.
【作者单位】：上海交通大学机械与动力工程学院;
【基金】：国家自然科学基金项目(11572192)
【分类号】：TH117

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