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Issue title: Proceedings from the 17th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2015)
Guest editors: Fumio Kojima, Futoshi Kobayashi and Hiroyuki Nakamoto
Article type: Research Article
Authors: Yang, Guicaia | Pei, Cuixianga | Xiao, Pana | Chen, Zhenmaoa; * | Wang, Wanjinb | Luo, Guangnanb
Affiliations: [a] Shaanxi Engineering Research Centre for NDT and Structural Integrity Evaluation, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, Shaanxi, China | [b] Institue of Plasma Physics, Chinese Academy of Sciences (ASIPP), Hefei, Anhui, China
Correspondence: [*] Corresponding author: Zhenmao Chen, Shanxi Engineering Research Centre for NDT and Structural Integrity Evaluation, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, Shaanxi, China. Tel./Fax: +86 29 8266 8736; E-mail:[email protected]
Abstract: In this paper, an electromagnetic acoustic transducer (EMAT) method using rotating bias magnetic field was proposed for NDT of delamination defect in a thin multilayer tube of W-Cu monoblock in ITER divertor. To investigate its feasibility, a numerical simulation code was developed for EMAT signal simulation of tube configuration and uniform bias magnetic field. The EMAT signals of a typical EMAT transducer under bias magnetic field applied outside the tube were simulated for deboning defect of different size in the W-Cu interface of the mono-block. The reasonable sound speed and simple dependence of the signal amplitude on defect size demonstrated that the developed code is efficient and the proposed rotating bias field EMAT is feasible for inspecting delamination defect in thin multilayer tubes. In addition, an experiment was carried out to investigate the influence of the rotating speed on the EMAT signals. It is found that a normal rotation speed does not give significant influence on the EMAT signals, which further support the validity of the rotating bias field EMAT.
Keywords: EMAT, rotation bias magnetic field, monoblock, delamination, thin multilayer tube, Tokamak
DOI: 10.3233/JAE-162120
Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 3-4, pp. 1331-1339, 2016
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