A hybrid elastic metamaterial with negative mass density and tunable bending stiffness
A hybrid elastic metamaterial with negative mass density and tunable bending stiffness
复制标题
具有负质量密度和可调弯曲刚度的混合弹性超材料
DOI：
10.1016/j.jmps.2017.05.009
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发表时间：
2017-08-01
影响因子：
5.3
通讯作者：
Huang, Guoliang
中科院分区：
文献类型：
--
作者：
Chen, Yangyang;Hu, Gengkai;Huang, Guoliang
利用局部共振超材料实现振动和/或波衰减由于其频率相关的负有效质量密度而引起了极大的关注。此外，具有分流压电片的自适应声子晶体还通过控制电路来实现负有效刚度而展示了可调谐波衰减机制。在本文中，我们提出了一种自适应的混合超材料，具有负的质量密度以及通过适当地利用机械和电气元件的刚度非常可调。首先建立了一个多物理场分析模型，研究并揭示了混合超材料在有效负质量密度和弯曲刚度方面的可调谐波操纵能力。然后通过混合超材料板的三维（3D）多物理数值模拟说明了编程的弯曲波操纵，宽带负折射和波导。我们的数值结果表明，弯曲波的传播基本上可以切换之间的“开/关”状态，通过连接不同的分流电路。(C)2017爱思唯尔有限公司版权所有
Achieving vibration and/or wave attenuation with locally resonant metamaterials has attracted a great deal of attention due to their frequency dependent negative effective mass density. Moreover, adaptive phononic crystals with shunted piezoelectric patches have also demonstrated a tunable wave attenuation mechanism by controlling electric circuits to achieve a negative effective stiffness. In this paper, we propose an adaptive hybrid meta-material that possesses both a negative mass density as well as an extremely tunable stiffness by properly utilizing both the mechanical and electric elements. A multi-physical analytical model is first developed to investigate and reveal the tunable wave manipulation abilities in terms of both the effective negative mass density and/or bending stiffness of the hybrid metamaterial. The programmed flexural wave manipulations, broad-band negative refraction and waveguiding are then illustrated through three-dimensional (3D) multi-physical numerical simulations in hybrid metamaterial plates. Our numerical results demonstrate that the flexural wave propagation can essentially be switched between "ON/OFF" states by connecting different shunting circuits. (C) 2017 Elsevier Ltd. All rights reserved.