首页|The coupling of SH guided wave and Lamb wave in the three-dimensional waveguides with finite cross-section
The coupling of SH guided wave and Lamb wave in the three-dimensional waveguides with finite cross-section
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NETL
NSTL
Elsevier
The waveguides with finite cross-section (such as rail, flat steel) are one of the most crucialconfigurations in infrastructure. When the shear horizontal (SH) guided waves are excited, thethree-dimensional deformation of the elastomer will excite weak Lamb waves. In the finite crosssectionwaveguides, Lamb waves and SH waves are coupled together with each other. Modecoupling will influence the vibration direction of particles, resulting in wavelength changes ofguided waves, which affects precise localization and quantification of defects. In this study, theSH0-like guided wave of flexural-like motion in the rectangular plate are analyzed theoretically.For the rectangular plate, the wavelength difference of SH0-like guided wave decreases with theincrease of rectangular plate width and with the decrease of the excitation wavelength, respectively.The wave finite element method (WFEM) was used to calculate the dispersion curves ofSH0-like guided wave, and the law of the wavelength changes is consistent with the theoreticalanalysis. Rectangular plates with different widths are selected and the excitation frequencies alsovary according to different wavelengths. The changes of wavelengths and particle vibration directionare obtained by simulation, which are consistent with the theoretical analysis. Theperiodic-permanent-magnet (PPM) electromagnetic acoustic transducer (EMAT) with differentwavelengths are constructed and used in the experiments to excite SH0-like guided wave. Thewavelengths of experimental signal are calculated by two-dimensional fast Fourier transform(2DFFT), and the law of the wavelength changes are verified.
Finite cross-sectionSH guided waveMode couplingFirst-order shear deformationWave finite element method
Songtao Hu、Guofu Zhai、Zhichao Li、Zhengyang Qu、Chao Lu
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School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China
NETL
NSTL
Elsevier
