带热障涂层构件界面应力分析边界元法

提出带热障涂层构件二维应力分析边界元法。对薄体应力分析边界元中近奇异积分处理方法进行完善及改进，并将其推广应用于热应力及离心应力边界元分析，提出可以考虑温度及离心载荷的多层域结构应力分析边界公式，数值算例结果表明，采用本文方法可用少量单元得到梯度温度场，面力和／或离心载荷条件下涂层界面应力分布，三种载荷情况下界面切向拉伸应力的最大相对误差小于0．23％，本方法可作为带热障涂层构件设计及涂层剥落失效分析的有效工具。

ADVANCED BOUNDARY ELEMENT METHOD FOR INTERFACIAL STRESS ANALYSIS OF THERMAL BARRIER COATED COMPONENTS

An advanced boundary element method (BEM) was proposed for two-dimensional interfacial stress analysis of thermal barrier coated components. First, the non-linear transformation scheme in stress analysis of thin-body under traction by BEM was improved and extended to evaluate the nearly singular integral in BEM for thermal and centrifugal stress analysis. Then BEM formulation for multi-layer structure under thermal and centrifugal loads was presented. Numerical examples demonstrate that accurate interfacial stresses of thermal barrier coated components can be obtained efficiently by the method in this paper. The maximum relative percentage errors of interfacial tangent tension stresses under gradient temperature field, traction and centrifugal load were less than 0.08%, 0.13% and 0.23%, respectively, even when the ratio of element length to coating thickness approached 10 9. The BEM presented in this paper will be an efficient tool for thermal barrier coating design and coating-peeling-failure analysis.