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首页> 外文期刊>Smart Materials & Structures >Wave control through soft microstructural curling: bandgap shifting, reconfigurable anisotropy and switchable chirality
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Wave control through soft microstructural curling: bandgap shifting, reconfigurable anisotropy and switchable chirality

机译：通过柔软微观结构卷曲的波控制：带隙转移，可重新配置各向异性和可切换性的手性

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摘要

In this work, we discuss and numerically validate a strategy to attain reversible macroscopic changes in the wave propagation characteristics of cellular metamaterials with soft microstructures. The proposed cellular architecture is characterized by unit cells featuring auxiliary populations of symmetrically-distributed smart cantilevers stemming from the nodal locations. Through an external stimulus (the application of an electric field), we induce extreme, localized, reversible curling deformation of the cantilevers-a shape modification which does not affect the overall shape, stiffness and load bearing capability of the structure. By carefully engineering the spatial pattern of straight (non activated) and curled (activated) cantilevers, we can induce several profound modifications of the phononic characteristics of the structure: generation and/or shifting of total and partial bandgaps, cell symmetry relaxation (which implies reconfigurable wave beaming), and chirality switching. While in this work we discuss the specific case of composite cantilevers with a PDMS core and active layers of electrostrictive terpolymer P(VDF-TrFE-CTFE), the strategy can be extended to other smart materials (such as dielectric elastomers or shape-memory polymers).
机译：在这项工作中，我们讨论和数值验证了一种策略，以实现具有柔软微观结构的蜂窝状超材料波传播特性的可逆宏观变化。所提出的蜂窝架构的特征在于单位电池，其特征在于具有从节点位置源的对称分布的智能悬臂的辅助群体。通过外部刺激（电场的应用），我们诱导悬臂的极端，局部，可逆的卷曲变形 - 一种不影响结构的整体形状，刚度和承载能力的形状改性。通过小心地用直线（未激活）和卷曲（激活）悬臂的空间图案，我们可以诱导结构的张素特性的几种深刻修改：总和/或移位的总和部分带隙，细胞对称松弛（这意味着可重构的波束）和手性切换。虽然在这项工作中，我们讨论具有PDMS核心和电致伸缩三元共聚物P（VDF-TRFE-CTFE）的PDMS核心和有源层的复合悬臂器的具体情况，该策略可以扩展到其他智能材料（例如介电弹性体或形状记忆聚合物。 ）。

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