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| Dynamic Response Characteristics of Closed Crack with the High Frequency Eddy Current Loading |
| Liu Suzhen1, Zhuang Dongchao1, Shang Shibo2, Zhang Chuang1, Cai Zhichao1, Jin Liang3 |
1. Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of Technology Tianjin 300130 China;
2. Huazhong University of Science and Technology Wuhan 430074 China;
3. Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin 300387 China |
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Abstract The closed crack is one of early forms of the metal fatigue damage. Because of the close-knit contact of interfaces of closed cracks, the conventional electromagnetic ultrasonic transducer (EMAT) method is not ideal for detection. This paper presents a new technique for nonlinear Rayleigh surface wave measurements combined with EMAT, and the finite element simulation model is established that can describe the electromagnetic transduction process and closed crack's response process. The displacement distribution and the amplitude frequency characteristics of vibration particles are simulated in the process of EMAT surface wave transmission with high frequency eddy current loading. By virtue of the second harmonic component, the nonlinear propagation characteristics of EMAT surface wave in aluminum plate are analyzed, which can provide theoretic basis to apply electromagnetic loading technique to nonlinear ultrasonic detection of the closed cracks.
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Received: 05 February 2015
Published: 20 October 2015
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2015, Vol. 30 
