| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Propagation Properties of Backward Lamb Waves in Plate Investigated by Dynamic Photoelastic Technique |
| Zhong-Tao Hu1,2, Zhi-Wu An1**, Guo-Xuan Lian1, Xiao-Min Wang1 |
1State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190
2University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Zhong-Tao Hu, Zhi-Wu An, Guo-Xuan Lian et al 2017 Chin. Phys. Lett. 34 114301 |
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Abstract The dynamic photoelastic technique is employed to visualize and quantify the propagation properties of backward Lamb waves in a plate. Higher energy leakage of second-order symmetric backward wave mode S$_{\rm 2b}$ in contrast to third-order anti-symmetric backward mode A$_{\rm 3b}$ is shown by the dispersion curve of a plate immersed in water, and then verified by experiments. To avoid the considerable high leakage, the plate is placed in air, both group and phase velocities of modes S$_{\rm 2b}$ and A$_{\rm 3b}$ in the glass plate are experimentally measured. In comparison with the theoretical values, less than 5% errors are found in experiments.
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Received: 28 July 2017
Published: 25 October 2017
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| PACS: |
43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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46.40.Cd
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(Mechanical wave propagation (including diffraction, scattering, and dispersion))
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43.20.+g
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(General linear acoustics)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11374325 and 11427809. |
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