Asymmetric energy barrier and mechanical diode effect from folding multi-stable stacked-origami
Asymmetric energy barrier and mechanical diode effect from folding multi-stable stacked-origami
复制标题
DOI：
10.1016/j.eml.2017.09.008
复制
发表时间：
2017-11-01
影响因子：
4.7
通讯作者：
Li, Suyi
中科院分区：
文献类型：
--
作者：
Fang, Hongbin;Wang, K. W.;Li, Suyi
折纸，一种古老的折纸艺术，已经演变成一种广泛的工程系统的设计框架，例如可展开的结构和建筑的蜂窝材料。从根本上说，三维折叠不仅是产生形状变换的有力工具，而且是编程复杂弹性特性的强大平台。本研究研究了由多个Miura-Ori薄片组成的堆叠折纸细胞固体的多稳定性特征，特别是双细胞链结构。实验结果表明，折叠在相邻的两个双稳态折纸细胞之间施加了独特的运动约束，可以显著增加伸缩开关从一个稳态到另一个稳态的势垒，而不会显著增加相反开关的势垒，从而产生不对称势垒。我们建立了一个几何力学模型来检验观察到的不对称行为的基本物理原理，并展示了增强这种不对称能垒和实现静态机械二极管效应的潜力。也就是说，多稳定折纸可以很容易地通过在不同稳定状态之间的切换来压缩，但需要很大的外力来扩展。由于这种二极管效应有可能将相互作用的载荷修正为单向变形，因此本研究的结果可以成为具有新功能的折纸固体的基础。(C)2017爱思唯尔有限公司。保留所有权利。
Origami, the ancient art of paper folding, has evolved into a design framework of a wide variety of engineering systems such as deployable structures and architected cellular materials. The fundamentally three-dimensional folding is not only a capable tool to generate shape transformation, but also a powerful platform to program sophisticated elastic properties. This study investigates the multi-stability characteristics of a stacked origami cellular solid consisting of multiple Miura-ori sheets, specifically focusing on a dual-cell chain structure. Experiment results indicate that folding imposes a unique kinematic constraint between the two adjacent bistable origami cells, which can significantly increase the energy barrier of the extensional switch from one stable state to another without notably increasing the barrier of the opposite switch, creating an asymmetric barrier. We formulate a geometric mechanics model to examine the underlying physical principles of the observed asymmetric behaviors, and demonstrate the potentials to strengthen this asymmetric energy barrier and to achieve a static mechanical diode effect. That is, the multi-stable origami could be easily compressed via switching between different stable states, but demand a large external force to be extended. Since such diode effect has the potential to rectify reciprocal loads into unidirectional deformation, the results of this study can become the building blocks for origami solids with novel functionalities. (c) 2017 Elsevier Ltd. All rights reserved.