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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (9): 425888-425888.doi: 10.7527/S1000-6893.2021.25888

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

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

WU Rui1, SHI Wenze1,2, LU Chao1,3, LI Qiufeng1, CHEN Guo1   

  1. 1. Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China;
    2. State Key Laboratory of Acoustic Field and Acoustic Information, Academy of Acoustics, Chinese Academy of Sciences, Beijing 100190, China;
    3. Key Laboratory of Simulation and Numerical Modeling Technology of Jiangxi Province, Gannan Normal University, Ganzhou 341000, China
  • Received:2021-05-31 Revised:2021-06-18 Online:2022-09-15 Published:2021-08-25
  • Supported by:
    National Natural Science Foundation of China (12064001, 52065049, 51705231); Natural Science Foundation of Jiangxi Province (20192ACBL20052); Science and Technology Innovation Platform of Jiangxi Province (20204BCJL22039, 20192BCD40028); Natural Science Fund Project in Jiangxi Province (20181BAB216020); Graduate Innovation Fund Project of Nanchang Hangkong University (YC2020057)

Abstract: The 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.

Key words: aerospace stainless steel sheet, Electromagnetic Ultrasonic Transducer (EMAT), SH wave guide, radiated sound field, Distance Amplitude Curve (DAC)

CLC Number: