期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 143, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2020.104052
关键词
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资金
- National Natural Science Foundation of China [11972296]
- 111 Project [BP0719007]
- Institute CARNOT (ICEEL)
- La Region Grand Est
- Fundamental Research Funds for the Central Universities [310201901A005]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX201936]
- China Scholarship Council (CSC) [201806290176]
A broadband elastic wave absorption by a sub-wavelength and lightweight structure is of considerable significance in vibration suppression, especially for low frequencies in plate-like structure. However, it has always been a great challenge. In this research, we systematically study the flexural wave diffraction in a thin plate. Based on the diffraction mechanism, we propose the concept of sub-wavelength lossy gradient elastic metasurface for flexural wave absorption. We theoretically reveal high-efficiency and quasi-omnidirectional absorption behavior, which stem from maximum multireflection-enhanced absorption of the 0th order diffraction. We experimentally demonstrate a robust high-efficiency absorption in the frequency range from 343 to 1000 Hz (larger than 1.5 octaves). In addition, we propose a general approach which involves new physics of adjusting an arrangement sequence of subunits to suppress the first-order diffraction mode. This allows to further reduce the sub-wavelength thickness of the metasurface while maintaining its high-efficiency absorption. Our designs could provide new routes to broadband vibration suppression and cancelation in low frequency by lossy elastic metamaterials and metasurfaces. (C) 2020 Elsevier Ltd. All rights reserved.
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