通过软微结构卷曲的波控制：带隙移动，可重构的各向异性和可切换的手性
Wave control through soft microstructural curling: bandgap shifting, reconfigurable anisotropy and switchable chirality
摘要：
在这项工作中，我们讨论和数值验证的战略，以实现可逆的宏观变化的波传播特性的细胞与软微结构的超材料。所提出的细胞结构的特点是由单位细胞具有辅助人口的平行分布的智能杠杆源于节点的位置。通过外部刺激（施加电场），我们诱导极端的，局部的，可逆的卷曲变形的悬臂-形状修改，不影响整体形状，刚度和承载能力的结构。通过仔细设计直的（非激活的）和卷曲的（激活的）杠杆的空间图案，我们可以诱导结构的声子特性的几个深刻的修改：总带隙和部分带隙的产生和/或移动，细胞对称性弛豫（这意味着可重构的波束），和手性切换。虽然在这项工作中，我们讨论的具体情况下，复合材料的PDMS核心和活性层的电致伸缩材料（VDF-TrFE-CTFE），该策略可以扩展到其他智能材料（如介电弹性体或形状记忆聚合物）。
英文摘要：
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).
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