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| Electromagnetic Acoustic Emission Detection Method of Ferromagnetic Materials Based on the EMAT |
| Jin Liang1, Kou Xiaofei1, Guo Fukun1, Yang Qingxin1, Du Chongjie2 |
1. Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin 300387 China;
2. State Grid Hebei Electric Power Company Shijiazhuang 050021 China |
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Abstract The electromagnetic acoustic transducer (EMAT) is widely used in non-destructive testing and non-destructive evaluation due to its feature of non-contact testing. However, researches and reports on how to use it to judge the crack activity have not been seen. Since the electromagnetic acoustic emission technology can be used to detect microcracks and judge their activity, the detection by EMAT on the electromagnetic acoustic emission of ferromagnetic materials is realized in an innovative manner on the basis of taking the magnetostrictive effect into consideration and according to the principles and properties of the two detection methods of EMAT and electromagnetic acoustic emission technology. This paper offers simulation analyses and experiments on EMAT and provides a judgment basis for the crack activity. The simulation and experimental results show that EMAT can generate acoustic emission signals in the ferromagnetic material and accomplish the destruction assessment on the ferromagnetic material, which provides theoretical and practical instructions in the judgment of crack activity in actual detections by EMAT.
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Published: 10 October 2017
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2017, Vol. 32 
