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In-situ and real-time tests on the damage evolution and fracture of thermal barrier coatings under tension: a coupled acoustic emission and digital image correlation method

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Authors
Zhou, M.
Yao, W.
Yang, X.
Peng, Z.
Li, K.
Dai, C.
Mao, W.
Zhou, Y.
Lu, Chunsheng
Date
2014
Type
Journal Article

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Zhou, M and Yao, W and Yang, X and Peng, Z. and Li, K. and Dai, C. and Mao, W. et al. 2014. In-situ and real-time tests on the damage evolution and fracture of thermal barrier coatings under tension: a coupled acoustic emission and digital image correlation method. Surface & Coatings Technology. 240: pp. 40-47.
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Surface & Coatings Technology
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Abstract

By using a coupled acoustic emission (AE) and digital image correlation (DIC) technique, the failure behavior of air plasma sprayed thermal barrier coatings (TBCs) was investigated. The in-situ DIC observations show that the characteristics of AE signals, extracted from the fast Fourier transform, are closely related to the failure modes of a TBC system, which was applied to real-time reveal its damage evolution during tension. It is shown that there is a typical power-law relationship between the vertical crack density in coating and strain in substrate. A damage variable defined as a function of the cumulative AE events can be used to characterize the different fracture stages of a TBC system. With the increase of strain in substrate, the AE-b value estimated by the Gutenberg–Richter law varies from 2.0 at the initial regime to a plateau value of 1.2.