热障涂层系统中TGO应力生成的数值模拟  

Numerical simulation of stress generated in TGO in thermal barrier systems

作　　者：黄霞[1] 丁军[1] 曾祥国[2] 

机构地区：[1]重庆工学院汽车学院,重庆400050 [2]四川大学建筑与环境学院,成都610065

出　　处：《机械设计与制造》2009年第12期199-201,共3页Machinery Design & Manufacture

基　　金：国家基金委重大研究计划资助项目(50490272);四川大学"985"科技创新平台引进人才资助项目

摘　　要：采用有限元分析软件ABAQUS对热障涂层系统中TGO的应力生成进行了数值模拟。基于实验测得的TGO生成厚度和材料性能参数,研究了热氧化循环载荷中TGO应力产生的机理和影响因素,验证了材料属性转化方法模拟TGO生成过程的有效性。结果表明,热膨胀系数差异和TGO高温生长是导致TGO应力产生的主要原因,TGO厚度的增加导致了外层TGO中拉伸应力的产生,随着厚度的增加该应力逐渐增大。当TGO达到某一厚度时,该应力保持恒定。The numerical simulation for the stress generation in TGO in TBCs has been performed using ABAQUS.Based on the in-house measured TGO thickness rate and the actual material properties,the mechanism and the factor of stress induced in TGO are investigated upon twenty four thermal cycles.The va-lidity of the material property change method employed to model TGO formation is also discussed.The result shows that the CTE misfit between materials and TGO growth at high temperature are the main causes of stress generation and that TGO thickening causes the tensile stress generating at the outer TGO layer.The tensile stress increases with the TGO thickness,while remains constant at a certain value of TGO thikness.

关 键 词：热生长氧化物 应力生成 热氧化循环载荷 数值模拟 

分 类 号：TH16[机械工程—机械制造及自动化] TG174.453[金属学及工艺—金属表面处理]