热障涂层二向应力状态分析与危险点预测

doi:10.7527/S1000-6893.2021.24937

Abstract

Abstract: The spallation life cycle of thermal barrier coat (TBC) is a key factor for failure in one operating period of the aircraft engine. Research on the thermal fatigue life (TFL) of TBC has great significance for prolonging the service life of engine. An effective failure analysis method for TBC is performed using biaxial stress state analysis, finite element method, phenomenology theory, and linear cumulative damage model. It is demonstrated that with the increase of thermally grown oxide layer thickness, the position of the maximum thermal stress moves from peak to valley along the cosine curve of the top coat. Comparing with the traditional stress analysis method, the biaxial stress state analysis method is more suitable to predict the accurate position of the risk point, because the position of the normal stress peak and shear stress peak calculated by biaxial stress state analysis method is closer to each other. Based on the phenomenology theory and linear cumulative damage model, the accurate position of the risk point is determined at 3/10 of the axial distance from the peak to valley of the top coat. The predicted position of risk point is basically consistent with the normal crack location inside the top layer of TBC, which can verify the accuracy of the failure analysis method proposed in this paper.

Key words: thermal barrier coating, top coat, analysis of biaxial stress state, analysis of biaxial strain state, dangerous point prediction

CLC Number:

V235.11

YAO Yudong, AI Yanting, SONG Chun, GUAN Peng, TIAN Jing. Prediction of dangerous point of thermal barrier coating by biaxial stress state analysis[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(1): 424937-424937.

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Prediction of dangerous point of thermal barrier coating by biaxial stress state analysis

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