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Acoustic emission analysis on tensile failure of air plasma-sprayed thermal barrier coatings
Yao Wangbin 1 #,Dai Cuiying 1,Mao Weiguo 1 * #,Lu Chunsheng 2,Zhou Yichun 1
1.Faculty of Materials, Optoelectronics and Physics, Key Laboratory of Low Dimensional Materials & Application Technology, Ministry of Education, Xiangtan University, Hunan, 411105, China
2.Department of Mechanical Engineering, Curtin University, Western Australia 6845, Australia
*Correspondence author
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Funding: This work has been supported by the Open Fund of Aeronautical Science and Technology Key Lab. of Aeronautical Test and Evaluatio(No.No. HK2009005), the Young Teacher Fund of Ministry of Education)
Opened online: 9 December 2011
Accepted by: none
Citation: Yao Wangbin,Dai Cuiying,Mao Weiguo.Acoustic emission analysis on tensile failure of air plasma-sprayed thermal barrier coatings[OL]. [ 9 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4453646
 
 
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 transform, and their corresponding characteristic frequency spectrums and dominant bands were obtained to reveal fracture modes. Three different characteristic frequency bands were confirmed, corresponding to substrate deformation, surface vertical crack and interface delamination, with the aid of scanning electronic microscopy observations. A map of the tensile failure mechanism of air plasma-sprayed thermal barrier coatings was established. Using experimental data, the fracture strength and interface shear strength were estimated as 45.73 ± 3.92 MPa and 20.51 ± 1.74 MPa, respectively, which are well agreement with available results..
Keywords:Thermal barrier coating; Acoustic emission; Fast Fourier transform; Fracture mode
 
 
 

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