Programmable active kirigami metasheets with more freedom of actuation
Programmable active kirigami metasheets with more freedom of actuation
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DOI：
10.1073/pnas.1906435116
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发表时间：
2019-12-26
影响因子：
11.1
通讯作者：
Yin, Jie
中科院分区：
文献类型：
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作者：
Tang, Yichao;Li, Yanbin;Yin, Jie
Kirigami（切割和/或折叠）提供了一种很有前途的策略来重新配置超材料。传统上，kirigami超材料通常由在机械力下重新配置的被动切割单位单元组成。相反，活性kirigami超材料中的组成刺激响应材料将使潜在的机械性能和功能性成为可能，这是由切割单位细胞的主动控制引起的。然而，传统kirigami结构中的铰链的平面特征显著地限制了切割单元的变形和致动两者的自由度（DOF）。为了释放这两个约束，在这里，我们展示了一个通用的设计，实现折叠，以重建单一切割的超材料。我们发现，补充折叠不仅丰富了结构重构超越唯一的削减，但也使更多的自由度在致动kirigami元片成3维（3D），以响应环境温度。利用多自由度的变形的单位细胞，我们证明，具有相同的切割设计的平面元片可以自折叠成具有不同的机械性能的可编程的3D kirigami元结构。最后，我们展示了可编程kirigami机器人和易转向软机器人的潜在应用。
Kirigami (cutting and/or folding) offers a promising strategy to reconfigure metamaterials. Conventionally, kirigami metamaterials are often composed of passive cut unit cells to be reconfigured under mechanical forces. The constituent stimuli-responsive materials in active kirigami metamaterials instead will enable potential mechanical properties and functionality, arising from the active control of cut unit cells. However, the planar features of hinges in conventional kirigami structures significantly constrain the degrees of freedom (DOFs) in both deformation and actuation of the cut units. To release both constraints, here, we demonstrate a universal design of implementing folds to reconstruct sole-cuts- based metamaterials. We show that the supplemented folds not only enrich the structural reconfiguration beyond sole cuts but also enable more DOFs in actuating the kirigami metasheets into 3 dimensions (3D) in response to environmental temperature. Utilizing the multi-DOF in deformation of unit cells, we demonstrate that planar metasheets with the same cut design can self-fold into programmable 3D kirigami metastructures with distinct mechanical properties. Last, we demonstrate potential applications of programmable kirigami machines and easy-turning soft robots.