期刊
PHYSICS LETTERS A
卷 383, 期 23, 页码 2789-2796出版社
ELSEVIER
DOI: 10.1016/j.physleta.2019.05.039
关键词
Bragg bandgap; Dispersion relation; Elastic metamaterials; Local resonance; Pseudo bandgap; Seismic metamaterials
资金
- Shenzhen Science and Technology Funding Fundamental Research Program [JCYJ20170413141248626]
- General Research Grant from the Research Grants Council of the Hong Kong Special Administrative Region [CityU 11212017, 11216318]
A comprehensive numerical simulation study on elastic wave propagation for a novel engineered thin plate metamaterial structural system is presented. To enhance the accuracy of model, a mesh convergence study is validated. The wave dispersion spectra with bandgaps for three types of structures are presented. Based on local resonance phenomena, the low frequency pseudo and local resonance bandgaps are reported. Highlights are also included for the Bragg scattering induced directional bandgaps. The effects of material and geometric parameters on bandgaps are discussed. The finite element based frequency response study further validates the reported bandgaps. The conclusions. provide a new perspective for designs and applications of thin plate metamaterials for subwavelength wave manipulation including seismic shielding of civil infrastructures. (C) 2019 Elsevier B.V. All rights reserved.
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