Research on the stability of thermal barrier coatings under thermal cyclic loading

【Author】

Sun Jian;Xu Yingqiang;Li Wanzhong;Lv Kai;

【Abstract】

Thermally grown oxide(TGO) and the material thermal expansion misfit under thermal cyclic loading significantly affect the interfacial stress field and stability of thermal barrier coatings(TBCs). In this study, the stability evaluation method of TBCs under thermal cyclic loading based on energy is established using the visco-elastoplastic and shakedown theorem. The effect of TGO thickening on the stability and stress field of TBCs under thermal cyclic loading is analyzed through the numerical simulation of TBCs with the semicircle interface geometry and the TGO thickening data obtained from experiment. It is concluded that estimating from the stress-strain evolution behavior, the local stability of the TBCs decreases with the TGO thickening, and assessing from energy, TBCs shows instable with TGO thickening.

【Keywords】

TBCs;Research on the stability of thermal barrier coatings under thermal cyclic loading;

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