The second-harmonic generation of the fundamental antisymmetric Lamb wave at a closed parallel crack in an elastic plate is studied by numerical analysis. The closed crack is modeled as a spring-type interface with quadratic nonlinearity. Based on a perturbation method, the problem of nonlinear Lamb wave scattering is decomposed into two linearized problems, i.e., for the linear reflection/transmission of the incident Lamb wave at the crack and for the generation/radiation of the second-harmonic Lamb waves due to the contact nonlinearity. The reduced problems are solved by the finite element method in the frequency domain. Numerical results demonstrate significant effects of the crack resonance on the linear and nonlinear Lamb wave scattering responses, which appear as sharp peaks/dips in the reflection/transmission spectra and enhanced second-harmonic amplitudes at some frequencies. Two simple frequency selection rules are established which explain the enhanced generation of the second-harmonic Lamb waves. The time-domain analysis is also carried out to supplement the frequency-domain analysis, which confirms that the incident Lamb wave interacts with the crack at some specific frequencies in its bandwidth in a selective manner and enhances the generation of the second-harmonic components.
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October 2020
October 14 2020
Second-harmonic generation of the lowest-order antisymmetric Lamb wave at a closed parallel crack
Tianming Ye;
Tianming Ye
1
Institute of Acoustics, Tongji University
, No. 1239 Siping Road, Shanghai 200092, China
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Shiro Biwa;
Shiro Biwa
a)
2
Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University
, Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
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Naoki Mori
Naoki Mori
2
Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University
, Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
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a)
Electronic mail: [email protected]
J. Acoust. Soc. Am. 148, 2073–2085 (2020)
Article history
Received:
May 23 2020
Accepted:
September 23 2020
Citation
Tianming Ye, Shiro Biwa, Naoki Mori; Second-harmonic generation of the lowest-order antisymmetric Lamb wave at a closed parallel crack. J. Acoust. Soc. Am. 1 October 2020; 148 (4): 2073–2085. https://doi.org/10.1121/10.0002171
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