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Magnetostrictive Guided Wave Transducer with Semicircular Structure for Defect Detection of Semi-Exposed Pipe

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Abstract

The existing magnetostrictive guided wave transducers are usually circumferential symmetric and cannot be installed on semi-exposed pipes, such as water wall pipes. To test the semi-exposed pipes, we proposed a magnetostrictive transducer with semicircular structure, which consists of a semi-ring magnet and a semicircular coil. Firstly, energy coupling mechanism of magnetostrictive guided wave in the semi-exposed pipe is analyzed. The finite element models of the semi-ring magnet and the semicircular coil are established to study the magnetic field distributions in the pipes. From the simulation results, the semi-ring magnet can provide an axial static magnetic field that is uniform in circumferential direction and the axial direction of the pipe. The semicircular coil can generate the asymmetry axial alternating magnetic field. The magnetic field strength of the pipe surface covered by the semicircular coil is about two times than the uncovered pipe surface. The asymmetry magnetic field causes the induced guided waves include not only axisymmetric modes, but also non-axisymmetric modes. A prototype magnetostrictive guided wave transducer for semi-exposed pipe is provided. Experiments are carried out on two pipes with notch and wear defects respectively. The results show that the transducer can generate the longitudinal mode guided waves as the mainstay and the flexural mode as the auxiliary. The flexural mode is removed by the chirplet transform and the proposed transducer can be used to detect the flaw in the semi-exposed pipe.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 51575213) and the National Key Research and Development Program of China (Grant No. 2016YFC0801904).

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Authors and Affiliations

  1. School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, People’s Republic of China

    Linhao Wang, Jiang Xu & Chaoyue Hu

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  1. Linhao Wang
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  2. Jiang Xu
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  3. Chaoyue Hu
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Correspondence to Jiang Xu.

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Wang, L., Xu, J. & Hu, C. Magnetostrictive Guided Wave Transducer with Semicircular Structure for Defect Detection of Semi-Exposed Pipe. J Nondestruct Eval 40, 96 (2021). https://doi.org/10.1007/s10921-021-00831-4

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