表面涂层裂纹的特性分析  

The Analysis of Surface Coating Cracks

作　　者：赵华[1] 孙兵[1] 

机构地区：[1]西南交通大学应用力学与工程系,四川成都610031

出　　处：《四川大学学报（工程科学版）》2007年第6期50-54,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(10472097)

摘　　要：采用有限元方法研究TiN涂层裂纹在弹性球循环挤压和滑动接触状态下的三维弹塑性特性,计算分析了涂层-基体的应力分布规律、涂层表面及界面裂纹的断裂强度。结果表明:在接触区边缘、涂层基体结合界面应力幅较大,容易萌生疲劳裂纹;裂纹强度J积分随载荷循环而呈周期性变化;涂层厚度、基体材料、裂纹形状、裂纹倾角等参数对涂层表面和界面裂纹的J积分有显著影响。Three-dimensional elasto-plastic behaviors of cracks in TiN coatings under the cyclically indenting ,and sliding contacts of an elastic sphere are studied using finite element method. The stress distributions in the coating and substrate, and the fracture intensity, J integral, of cracks at the surface and interface are calculated. It is shown that the maximum stress is near the contact boundary, where the fatigue cracks will be easily initiated under the cyclic loadings. The parameters, such as thickness of coatings, substrate material, shape and obliquity of crack, have obvious influence on J-integrals of surface and interface cracks.

关 键 词：TiN涂层裂纹 J积分 弹塑性应力 有限元 

分 类 号：TH117[机械工程—机械设计及理论]