Hybrid elastic solids
Hybrid elastic solids
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DOI：
10.1038/nmat3043
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发表时间：
2011-08-01
期刊：
影响因子：
41.2
通讯作者：
Zhang, Zhao-Qing
中科院分区：
文献类型：
--
作者：
Lai, Yun;Wu, Ying;Zhang, Zhao-Qing
超材料可以表现出超越自然界的电磁和弹性特性。在这项工作中，我们提出了一种设计的弹性超材料，表现出多个共振在其积木。能带结构计算显示了两个负色散带，其中一个只支持压缩波，从而模糊了有限频率范围内流体和固体之间的区别，而另一个显示“超各向异性”，其中压缩波和剪切波只能沿沿着不同的方向传播。有效介质理论很好地解释了这种不寻常的特性，在常规固体中没有可比的类似物，并可能导致新的应用。
Metamaterials can exhibit electromagnetic and elastic characteristics beyond those found in nature. In this work, we present a design of elastic metamaterial that exhibits multiple resonances in its building blocks. Band structure calculations show two negative dispersion bands, of which one supports only compressional waves and thereby blurs the distinction between a fluid and a solid over a finite frequency regime, whereas the other displays 'super anisotropy' in which compressional waves and shear waves can propagate only along different directions. Such unusual characteristics, well explained by the effective medium theory, have no comparable analogue in conventional solids and may lead to novel applications.