The mechanical and acoustic properties of two-dimensional pentamode metamaterials with different structural parameters
The mechanical and acoustic properties of two-dimensional pentamode metamaterials with different structural parameters
复制标题
不同结构参数的二维五模超材料的力学和声学性能
DOI：
10.1063/1.4963818
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发表时间：
2016-09-26
影响因子：
4
通讯作者：
Chen, Hong
中科院分区：
文献类型：
--
作者：
Cai, Xuan;Wang, Lei;Chen, Hong
研究了不同结构参数的二维五模超材料的有效力学和声学特性。结果表明，随着结构参数的变化，有效体积模量和密度保持不变，与水的相同，而品质因数，即，体积模量与剪切模量之比（B/G）由于剪切模量的降低而逐渐增加。然而，全波模拟发现，随着B/G的增加，声散射越来越强烈，这表明五模超材料的声学特性逐渐偏离水的声学特性。这些反常的声学行为被认为是由于五模微结构中弯曲模的存在而引起的。结果表明，对于五模超材料，其力学性能不能简单地转化为声学性能，结构参数影响其力学和声学性能。
The effective mechanical and acoustic properties of two-dimensional pentamode metamaterials (PMs) with different structural parameters are investigated in this paper. It is found that with varying structural parameters, the effective bulk modulus and density remain constant as the same as those of water, while the figure of merit, i.e., the ratio of the bulk modulus to the shear modulus (B/G) gradually increases due to the decrease of the shear modulus. However, full wave simulations reveal that with the increase of B/G, the acoustic scattering becomes more and more intense, which indicates that the acoustic properties of pentamode metamaterials gradually deviate from those of water. These anomalous acoustic behaviors are proposed to arise from the existence of the bending modes in pentamode microstructures. Our results show that for pentamode metamaterials, the mechanical properties cannot be simply translated to their acoustic properties, and the structural parameters affect the mechanical and acoustic ...