Elastic wave propagation in adaptive honeycomb-based materials with high connectivity
Elastic wave propagation in adaptive honeycomb-based materials with high connectivity
复制标题
DOI：
10.1088/0964-1726/25/8/085003
复制
发表时间：
2016-07
影响因子：
4.1
通讯作者：
Zhi-wei Zhu;Z. Deng
中科院分区：
文献类型：
--
作者：
Zhi-wei Zhu;Z. Deng
具有高连通性的梁型周期性材料显示出独特的带隙行为，类似于声学超材料中的局部共振带隙。在这项研究中，结构上的方形凹蜂窝，一个高度连接的晶格配置具有八个折叠梁连接在每个关节，被引入到智能材料的主机结构，以定制弹性波的传播。在梁表面布置有限长的压电片，并连接负电容分流电路，通过改变分流电路的参数实现主动调节。通过有限元法结合布洛赫定理研究了这种智能结构材料的能带结构特性。结果表明，根据驻波模态的变形特性，提出的简单启发式模型可以精确估计压电片位置和力学性能变化引起的内谐振带隙的变化。这一发现将促进高连通蜂窝结构在弹性波自适应控制中的实际应用。
Beam-type periodic materials with high connectivity have displayed unique band gap behaviors analogous to locally resonant band gaps in acoustic metamaterials. In this study, structurally square re-entrant honeycomb, one highly connected lattice configuration featuring eight folded beams connected at each joint, is introduced to be the host structure of a smart material to tailor the elastic wave propagation. Finite length piezoelectric patches connected with negative capacitance shunting circuits are arranged on the beam surfaces, providing active adjustment via altering the parameters of shunting circuits. The characteristics of band structure of this smart structured material are investigated through the application of finite element method in conjunction with the Bloch theorem. Results demonstrate that the variation of internally resonant band gaps induced by the alteration of the piezoelectric patches to those positions and mechanical properties, can be precisely estimated by simple heuristic models proposed according to deformation characteristics of standing wave modes. This founding could promote the practical implementation of the highly connected honeycombs in the adaptive control to elastic wave.