Periodic co-continuous acoustic metamaterials with overlapping locally resonant and Bragg band gaps
Periodic co-continuous acoustic metamaterials with overlapping locally resonant and Bragg band gaps
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DOI：
10.1063/1.4902129
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发表时间：
2014-11-10
影响因子：
4
通讯作者：
Wang, Lifeng
中科院分区：
文献类型：
--
作者：
Chen, Yanyu;Wang, Lifeng
这封信报道了一组三周期共连续声学超材料，同时表现出滤波能力和增强的机械性能。我们数值模拟了这些声学超材料中完全带隙的存在，这归因于局部共振和布拉格散射的耦合效应。本质上，耦合效应由共连续结构的拓扑布置和组成相的力学性质决定。我们进一步表明，频率调谐的完整的带隙可以通过定制的几何排列和体积分数分布的共连续声学超材料。这项工作提供了一个线索，机械鲁棒的声学超材料的设计，以吸收声波和弹性波在恶劣的环境下。(C)2014 AIP出版有限责任公司。
This Letter reports a group of triply periodic co-continuous acoustic metamaterials exhibiting simultaneous wave filtering capability and enhanced mechanical properties. We numerically demonstrate the existence of complete band gaps in these acoustic metamaterials, which is attributed to the coupling effects of local resonances and Bragg scattering. Intrinsically, the coupling effects are governed by the topological arrangements of the co-continuous structures and mechanical properties of constituent phases. We further show that the frequency tunability of the complete band gaps can be achieved by tailoring the geometrical arrangements and volume fraction distribution of the co-continuous acoustic metamaterials. This work provides a clue to the design of mechanically robust acoustic metamaterials to absorb acoustic and elastic waves under harsh environments. (C) 2014 AIP Publishing LLC.