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于庆民,石永志.热不匹配应力对热障涂层表面裂纹扩展的影响[J].稀有金属材料与工程(英文),2018,47(10):3052~3057.[Yu Qingmin and Shi Yongzhi.Effect of Thermal Mismatch Stress on Surface Crack Propagation of Thermal Barrier Coatings[J].Rare Metal Materials and Engineering,2018,47(10):3052~3057.]
Effect of Thermal Mismatch Stress on Surface Crack Propagation of Thermal Barrier Coatings
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Received:December 07, 2016  Revised:August 11, 2018
Key words: thermal barrier coating  thermal mismatch stress  surface crack  extended finite element method
Foundation item:中央高校基本科研业务费专项资金资助(项目号3102015ZY031)
Author NameAffiliation
Yu Qingmin and Shi Yongzhi  
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      In this study, the effect of thermal mismatch stress on the surface crack propagation of thermal barrier coatings was investigated by using extended finite element method (XFEM). The results show that the location, slope angle and length of crack have a significant impact on crack propagation length, energy release rate and stress level at crack tip under the influence of thermal mismatch stress. The crack length is the longest and the energy release rate is the largest in the valley for the same initial crack. The larger the slope angle is, the shorter the length of crack expansion is but the larger the strain energy is. The larger the initial crack length is, the longer the crack growth length and the faster the expansion rate is, and the greater the energy release rate is. The crack propagation affects each other under the condition of multiple cracks.