Affiliations: [a] State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi ERC of NDT and Structural Integrity Evaluation, Xi’an Jiaotong University, Xi’an, China
Correspondence:
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Corresponding authors: Cuixiang Pei, State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi ERC of NDT and Structural Integrity Evaluation, Xi’an Jiaotong University, Xi’an, 710049, China. E-mail: pei.cx@mail.xjtu.edu.cn. Zhenmao Chen, State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi ERC of NDT and Structural Integrity Evaluation, Xi’an Jiaotong University, Xi’an, 710049, China. E-mail: chenzm@mail.xjtu.edu.cn
Abstract: Nondestructive testing (NDT) for damage in thermal barrier coatings (TBCs) is significant for the safety guarantee of gas turbine blades. As a new NDT technology, electromagnetic acoustic transducer (EMAT) is widely applied for NDT of conductive structural components due to its advantages of coupling-free and high adaptability. In this paper, numerical simulations are conducted to study the wave propagation and interaction with delamination defects in TBCs inspected with a Rayleigh wave EMAT of the Lorentz force mechanism. Based on the numerical results, the wave structure in TBC, wave conversion at delamination defect, time domain EMAT signals, and its B-scan images are evaluated and the feasibility of Rayleigh wave EMAT to inspect delamination in TBCs was theoretically clarified.
