ISSN   1004-0595

CN  62-1095/O4

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许迪初, 汪久根. 粗糙表面的弹塑性接触研究[J]. 摩擦学学报, 2016, 36(3): 371-379. DOI: 10.16078/j.tribology.2016.03.015
引用本文: 许迪初, 汪久根. 粗糙表面的弹塑性接触研究[J]. 摩擦学学报, 2016, 36(3): 371-379. DOI: 10.16078/j.tribology.2016.03.015
XU Dichu, WANG Jiugen. On Deterministic Elastoplastic Contact for Rough Surfaces[J]. TRIBOLOGY, 2016, 36(3): 371-379. DOI: 10.16078/j.tribology.2016.03.015
Citation: XU Dichu, WANG Jiugen. On Deterministic Elastoplastic Contact for Rough Surfaces[J]. TRIBOLOGY, 2016, 36(3): 371-379. DOI: 10.16078/j.tribology.2016.03.015

粗糙表面的弹塑性接触研究

On Deterministic Elastoplastic Contact for Rough Surfaces

  • 摘要: 建立了综合载荷作用下粗糙表面弹塑性接触的确定性模型, 考虑了微凸峰接触的弹塑性变形阶段, 数值求解得到实际接触面积、压力分布和微凸峰塑性形变. 分析了实际接触面积与法向载荷的关系, 并研究了点接触的椭圆参数对上述关系的影响. 建立了结点增长模型, 分析了结点增长与滑动摩擦系数的关系以及滑动摩擦系数随椭圆参数的变化. 结果表明: 随着法向载荷增大, 实际接触面积与法向载荷之间的非线性关系愈加显著; 椭圆参数越大, 实际接触面积越小, 选择较小的椭圆参数可降低平均接触压力; 结点增长的速率随滑动摩擦系数增大而增大; 表面剪切作用力使最大Mises应力值升高, 疲劳裂纹的发生源向表面靠近; 重载时选择较小的滚动轴承沟曲率半径系数有利于减小摩擦功耗.

     

    Abstract: A deterministic contact model of rough surfaces was established, which contained the elastoplastic deformation of the asperities. Some important parameters, e.g. real contact area, local pressure and plastic deformation, were calculated. Contact area variations with the normal load in different elliptical parameters were presented. Junction growth and its variations with the sliding friction coefficient under different normal loads were also investigated. It is obvious that the real contact area was nonlinearly related with the normal load at high normal load. A larger elliptical parameter resulted in a smaller real contact area. Thus, the smaller elliptical parameter was preferred given to the lower mean contact pressure. The rate of junction growth increased as the sliding friction coefficient increased. The maximum von Mises stress increased and its location moved upward to the surface when considering interfacial shear. Under the heavy-load condition, a smaller raceway groove curvature radius coefficient resulted in the reduction of frictional work.

     

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