摘要
利用有限元分析软件中的UMAT子程序,开发了一种新的数值模拟方法来研究热障涂层的位移不稳定性。它可以模拟TGO的实际增长情况,并且可以开放给工程人员进行更多更好的后续分析。对于热障涂层位移不稳定性的研究先是通过实验观察得到TGO的应力以及位移情况。然后利用有限元仿真分析得到其数值模拟结果,所用到的有限元模型是针对较小的TGO厚度(小于1μm),并且将数值模拟结果与目前公认的Karlsson的结果以及实验观察结果作对比。结果表明,TGO的最终变形以及应力分布与Karlsson的分析结果具有相当不错的吻合程度,证明了该数值模拟方案的正确性和有效性,为后续的工作特别是热障涂层系统失效的分析提供了很好的工程参考价值。
Using a subroutine UMAT in finite element analysis software ABAQUS, a new numerical simulation method was developed to study the displacement instability of thermal barrier coatings. It can simulate the actual growing process and be open to engineers to make further analysis based on the obtained result. To study the displacement instability of thermal barrier coatings, the stress and displacement of TGO was observed with experiments. Numerical simulation results were obtained by finite element analysis for thin TGO （less than 1 μm）, and experimental results were compared with Karlsson′s numerical results. The contrast has shown the validity and effectiveness of the proposed method based on the agreement with Karlsson′s results. This method can be a good reference for subsequent failure analysis of thermal barrier coatings.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第4期141-146,151,共7页
Materials Reports
基金
国家自然科学基金青年基金(11302272)
关键词
热障涂层
数值模拟
位移不稳定性
TGO
UMAT
thermal barrier coating, numerical simulation, displacement instability, TGO, UMAT
