粗糙面在梯度表面层上滑动接触的应力分布

The Contact Stress Distribution Analysis for the Rough Surface Sliding on the Gradient Layers Coating

对粗糙面在梯度表面层上的滑动过程进行应力分布研究 ,以模拟实际摩擦过程中 ,考虑塑性变形情况下 ,梯度覆层体中的应力分布规律 ,同时与均质体及单覆层体进行比较研究 ,分析了在表面载荷相同时滑动接触的应力分布。结果表明覆层体出现塑性变形后 ,在接触表面上的压力分布与弹性变形时有很大变化 ,在界面处梯度层的应力分布比单层膜更为理想 ,其应变梯度也较小 ;受相同表面载荷作用下产生塑性变形时 ,梯度层膜在基体产生塑性变形较小。表明梯度层在改善膜层与基体界面的应力分布及减小基体中的塑性变形区方面比单覆层有明显优点。

The stress distribution for a rough surface sliding on the gradient layers coating is investigated in this paper to stimulate the actual friction process. Also the stess distribution problem in the half space with gradient layers coating is considered and compared with the homogeneous half space and half space with single layer coating under same sliding contact load and in plastic deformation condition. The results show that the contact pressure distributions on the coating surfaces under plastic deformation will change greatly compared to those under elastic deformation. The stress distribution on the interface of gradient layers coating is more perfect than that of single layer. Also its strain gradients near the interface and the plastic area in the substrate are less than those of single layer. It indicates that the gradient layers coating has many advantages over the single layer coating in preventing the substrate from plastic deformation and reducing the interface stresses.