TiN涂层疲劳损伤的数值分析  

Numerical Analysis of Fatigue Damage in TiN Coatings

作　　者：赵华[1] 朱勇战[1] 

机构地区：[1]西南交通大学

出　　处：《中国机械工程》2009年第4期492-495,共4页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(10472097)

摘　　要：在能量释放率断裂准则的基础上,新定义了损伤的演化过程,并数值模拟了承载压块在TiN涂层/基体表面上循环滑动时,涂层和基体内部的塑性累积和疲劳损伤过程。循环剪应力导致涂层和基体的交界面上出现塑性累积和疲劳损伤,这是涂层接触疲劳破坏的主要原因。外部载荷、摩擦因数和涂层厚度对涂层/基体系统的疲劳寿命有显著影响。The damage evolution was defined on the basis of the fracture criterion ot energy release rate in damage mechanics. While a loaded body was sliding cyclically on the surface of TiN coating/ substrate system, the plastic accumulation and fatigue damage of the system were simulated numerically. The equivalent plastic strain accumulation and fatigue damage on the interface are mainly contributed by the cyclic shear stress,which is a key factor to eause the contact fatigue fail of coating/substrate system. The external loads, frictional coefficient and coating thickness all have some obvious influence on the fatigue life of coating/substrate system.

关 键 词：TIN涂层 塑性累积 疲劳损伤 数值分析 

分 类 号：TH117[机械工程—机械设计及理论]