不同界面形状及结构的涂层残余热应力的有限元分析

为了提高大厚度耐磨涂层的结合强度,运用 ANSYS 软件对不同界面形状及结构的耐磨涂层中残余热应力进行有限元分析。分析表明:界面形状为齿形的涂层比界面形状为平面的涂层残余热应力值略大,但不存在局部的应力集中且应力分布较均匀;随着过渡层的增加,涂层热膨胀系数过渡越好,残余热应力越小。同时应用盲孔法获得残余应力实际值,用CMT4105型微机电子万能试验机测试涂层与基材的剪切结合强度,验证应力分布的正确性。

Finite element analysis of residual thermal stress in different interfacial shape and structure of coatings

Aiming at enhancing interfacial bonding strength of thick and wear-resistant coatings,residual thermal stress in different interracial shape and structure of coatings is analysed by finite element method with ANSYS soft-ware.The conclusion is that the residual thermal stress in coating of dentiform interface is a little larger than that in plane interface,but local stress concentration does not exist and stress distributes uniformly.Along with the increasing of transitional layer,the transition of heat expansion coefficient in coating becomes better,the residual thermal stress is less.Then in order to validate the correctness of stress distributing,hole drilling method is used to test stress,CMT4105 all-purpose experimentation engine is used to test combinative intensity.This paper provides instructional suggestion for optimizing the interfacial shape and structure of wear- resistant coatings.