Numerical simulation of laser-EMAT testing depth of surface crack technology

Penghui Zhang; Yang Zhao; Peng Li; Zhiquan Zhou; Xue Bai; Jian Ma

doi:10.1117/12.2615122

15 October 2021 Numerical simulation of laser-EMAT testing depth of surface crack technology

Penghui Zhang, Yang Zhao, Peng Li, Zhiquan Zhou, Xue Bai, Jian Ma

Proceedings Volume 11933, 2021 International Conference on Neural Networks, Information and Communication Engineering; 119330Z (2021) https://doi.org/10.1117/12.2615122
Event: 2021 International Conference on Neural Networks, Information and Communication Engineering, 2021, Qingdao, China

Abstract

Laser-EMAT (electromagnetic acoustic transducer) technology has the advantages of laser induced ultrasound and EMAT simultaneously. This paper introduced a novel simulation about laser-EMAT testing the surface crack with various depth in the aluminum block. A finite element model of laser-EMAT detection was set up for investigating the influence of groove-type crack on ultrasonic propagation in the way of numerical simulation. Then, the response curve of voltage in time domain was obtained by the testing coil in EMAT, which is proposed to determine the depth of crack above. Good coupling could be found between voltage of signal received by EMAT coil and amplitude of ultrasound generated by the laser. In addition, the snapshot of ultrasound field at different time demonstrates mode conversion occurs when the surface wave propagated through the crack. The simulation results show the relative error of determining crack depth by the proposed method is less than 6.5%.

Citation Download Citation

Penghui Zhang, Yang Zhao, Peng Li, Zhiquan Zhou, Xue Bai, and Jian Ma "Numerical simulation of laser-EMAT testing depth of surface crack technology", Proc. SPIE 11933, 2021 International Conference on Neural Networks, Information and Communication Engineering, 119330Z (15 October 2021); https://doi.org/10.1117/12.2615122

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