Finite element simulations on erosion and crack propagation in thermal barrier coatings
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Erosion of thermal barrier coatings occurs when atmospheric or carbon particles from the combustion chamber are ingested into aviation turbine engines. To understand the influence of erosion on the service life of thermal barrier coatings, we introduce the erosion and crack propagation models, and then by using finite element simulations, determine the relationship between the penetrating depth, the maximum principle stress and impingement variables such as velocity and angle. It is shown that cracks nucleate and extend during the erosion process and the length of a crack increases with the increase of the particle velocity and impact angle.
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Yao, W.; Dai, C.; Mao, W.; Lu, Chungsheng; Yang, L.; Zhou, Y. (2012)An acoustic emission technique was used to monitor the cracking behavior and fracture process of thermal barrier coatings subjected to tensile loading. Acoustic emission signals were extracted and preformed by fast Fourier ...
Real-time testing of the failure process and rupture time prediction in thermal barrier coatings using accoustic emission.Lu, Chungsheng; Yang, L.; Zhou, Y. (2011)The real-time testing and quantitative assessment of damage evolution in thermal barrier coatings (TBCs) is desirable, but still intractable. In this paper, the fracture process of TBCs subjected to mechanical or thermal ...
Numerical study on interaction of surface cracking and interfacial delamination in thermal barrier coatings under tensionZhu, W.; Yang, L.; Guo, J.; Zhou, Y.; Lu, Chunsheng (2014)The interaction of surface cracking and interfacial delamination in thermal barrier coatings under tension is investigated by using a cohesive zone finite element model. It is found that the surface crack density has a ...