硬涂层半空间体的弹性场分析

The Analysis of Elastic Fields of Hard Layered Solids

运用Hankel积分变换详细推导了具有一个硬涂层的半空间体在Hertz半椭圆接触应力作用下的轴对称弹性场．计算结果表明，涂层厚度对表层应力场有显著影响．在考虑表面粗糙度后，增加涂层厚度会使涂层底部出现较大的拉应力，导致涂层的断裂剥离，对滚动接触疲劳（RCF）中陶瓷硬涂层（TiN或TiC镀膜）的作用及破坏机理进行了较详尽的分析．

The Hankel integral transformation is used to reformulate the stress and displacement fields of an elastic half-space with a hard ceramic layer. The numerical results show that the thickness of the hard layer has a strong influence on the stress distribution both in the layer and in the substrate. At the surface asperity level, it is found that the increase of the layer thickness will result in a tension stress at the bottom of the layer, which is likely to develop microcracks in the radial direction, thus shortening the rolling contact fatigue (RCF) life of the layer and substrate materials.This conclusion is consistent with recent RCF experiment results conducted by other reseachers.