Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8028165 | Surface and Coatings Technology | 2014 | 8 Pages |
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.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
M. Zhou, W.B. Yao, X.S. Yang, Z.B. Peng, K.K. Li, C.Y. Dai, W.G. Mao, Y.C. Zhou, C. Lu,