Quantitative analysis method for electromagnetic ultrasonic SH guided wave detection of aerospace stainless steel sheet

被引：0
|
作者：
Wu R. [1 ]
Shi W. [1 ,2 ]
Lu C. [1 ,3 ]
Li Q. [1 ]
Chen G. [1 ]
机构：
[1] Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang
[2] State Key Laboratory of Acoustic Field and Acoustic Information, Academy of Acoustics, Chinese Academy of Sciences, Beijing
[3] Key Laboratory of Simulation and Numerical Modeling Technology of Jiangxi Province, Gannan Normal University, Ganzhou
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2022年 / 43卷 / 09期
基金：
中国国家自然科学基金;
关键词：
aerospace stainless steel sheet; Distance Amplitude Curve (DAC); Electromagnetic Ultrasonic Transducer (EMAT); radiated sound field; SH wave guide;
D O I：
10.7527/S1000-6893.2021.25888
中图分类号：
学科分类号：
摘要：
he Shear Horizontal (SH) wave Electromagnetic Ultrasonic Transducer (EMAT) has the advantages of non-contact, no coupling agent, insensitivity to surface oil coating, single point excitation and wide range detection. It has important technical advantages in rapid guided wave detection of aviation stainless steel sheet. A finite element model of SH guided wave propagation in stainless steel sheet with defects is established. The Distance Amplitude Curve (DAC) of the defects corresponding to different design parameters of EMAT is analyzed, and the DAC was verified by experiments. A finite element model for the acoustic field analysis of SH guided waves in stainless steel plates is established. The effects of the width, length and logarithm of the Permanent Magnet in Periodic-Permanent-Magnet Electromagnetic Acoustic Transducer (PPM EMAT) on the acoustic field characteristics of SH guided waves are studied. The axial sound pressure distribution of EMAT is obtained. On this basis, the optimal design parameter combination of EMAT is obtained. The results show that increasing the length and logarithm of permanent magnet can improve axial radiation acoustic field intensity of the EMAT, which makes the EMAT have good uniformity of sound pressure distribution in remote detection. When the number, length and width of permanent magnet are 6 pairs, 25 mm and 7 mm respectively, the corresponding EMAT has higher axial radiation acoustic field intensity and more stable DAC, and is more suitable for long-distance rapid guided wave detection of aviation stainless steel sheet. © 2022 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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