The Combined Effect of Creep and TGO Growth on the Cracking Driving Force in a Plasma-Sprayed Thermal Barrier System
作者： Zhi-Yuan Wei , Hong-Neng Cai , Rui-Xue Feng , He Zhang
DOI: 10.1007/S11666-019-00873-1
关键词:
摘要: A comprehensive understanding of the failure mechanisms plasma-sprayed thermal barrier coatings (TBCs) under temperature cycling is a prerequisite for developing next advanced gas turbine with prolonged cyclic lifetime. In this study, finite element model including dynamic growth thermally grown oxide (TGO) proposed to explore combined effect creep and TGO on cracking driving force in TBCs. different group material configurations designed satisfy objective. An adapted interface based virtual crack closure technique obtain strain energy release rate, namely force, assessed using mixed-mode criterion. The results reveal that predicted by simulation line experiment results. Two possible coalescence are proposed. increase lateral will induce premature coating spallation. bond coat only have slight impact ceramic if comparatively low stress included. Hence, optimization suggested study may provide additional options development TBCs extended
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