Deeply subwavelength giant monopole elastodynamic metacluster resonators.
Deeply subwavelength giant monopole elastodynamic metacluster resonators.
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深亚波长巨型单极弹性动力亚团谐振器。
DOI：
10.1098/rspa.2022.0026
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发表时间：
2022-07
影响因子：
3.5
通讯作者：
Parnell, William J.
中科院分区：
文献类型：
--
作者：
Cotterill, Philip A.;Nigro, David;Parnell, William J.
巨共振是一种众所周知的现象，用于调节在弹性基质中包括空隙的复合材料（例如弹性体）的动态响应，所述弹性基质具有比其剪切模量大得多的体积模量。这种低频共振（例如，对于标准弹性体，其中和分别是压缩波长和空隙半径）已经推动了数十年的声学材料设计，利用了亚波长范围。尽管这种广泛的使用，其中的共振所产生的空隙在紧密接近的方式是由它们的相互作用的影响是不理解的。在这里，我们说明，平面弹性动力学（圆柱形空隙），耦合由于近场剪切显着修改的压缩（压缩）共振响应。我们表明，通过修改的数量和配置的空隙在一个metacluster，方向性，散射振幅和共振频率可以定制和调谐。也许最值得注意的是，元簇提供了一个较低的频率共振比一个单一的空白。例如，与相同体积的单个空隙相比，两个接触空隙的谐振频率降低了近16%。与其他谐振器相结合，这样的元团簇可以作为元原子用于具有奇异动态材料特性的弹性材料的设计。
The giant monopole resonance is a well-known phenomenon, employed to tune the dynamic response of composite materials comprising voids in an elastic matrix which has a bulk modulus much greater than its shear modulus, e.g. elastomers. This low frequency resonance (e.g. for standard elastomers, where and are the compressional wavelength and void radius, respectively) has motivated acoustic material design over many decades, exploiting the subwavelength regime. Despite this widespread use, the manner by which the resonance arising from voids in close proximity is affected by their interaction is not understood. Here, we illustrate that for planar elastodynamics (circular cylindrical voids), coupling due to near-field shear significantly modifies the monopole (compressional) resonant response. We show that by modifying the number and configuration of voids in a metacluster, the directionality, scattering amplitude and resonant frequency can be tailored and tuned. Perhaps most notably, metaclusters deliver a lower frequency resonance than a single void. For example, two touching voids deliver a reduction in resonant frequency of almost 16% compared with a single void of the same volume. Combined with other resonators, such metaclusters can be used as meta-atoms in the design of elastic materials with exotic dynamic material properties.
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影响因子：
13.6
作者：
Ma G;Sheng P
通讯作者：
Sheng P
影响因子：
1.7
作者：
Corless, RM;Gonnet, GH;Knuth, DE
通讯作者：
Knuth, DE
影响因子：
2.6
作者：
Brule, Stephane;Enoch, Stefan;Guenneau, Sebastien
通讯作者：
Guenneau, Sebastien
影响因子：
2.4
作者：
GAUNAURD, GC;UBERALL, H
通讯作者：
UBERALL, H
DOI：
10.1016/0022-5096(94)90039-6
发表时间：
1994-05-01
影响因子：
5.3
作者：
MCPHEDRAN, RC;MOVCHAN, AB
通讯作者：
MOVCHAN, AB