An origami-inspired structure with graded stiffness
An origami-inspired structure with graded stiffness
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DOI：
10.1016/j.ijmecsci.2017.12.026
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发表时间：
2018-02-01
影响因子：
7.3
通讯作者：
Chen, Yan
中科院分区：
文献类型：
--
作者：
Ma, Jiayao;Song, Jichao;Chen, Yan
以折纸为灵感的结构和机械超材料通常由单独的镶嵌重复单元组成，其折叠和相对几何形状决定了整体的机械性能。如果这些单元相同，则结构的力学行为从头到尾都是一致的，这意味着它不能适应变化的载荷条件。在这里，我们创造和研究了一个折纸结构，基于Miura-Ori折叠图案，它在体积和分级硬度上具有不同的几何形状。利用运动学分析，我们展示了如何改变折叠图案的几何参数，以创建刚性可折叠和自锁平台。从实验和数值两方面论证了该结构在准静态离面压缩时可以获得周期性的渐变刚度，并且可以通过改变基本的几何设计来调整力学响应。我们得到了一种具有良好能量吸收能力的结构，可以均匀地镶嵌重复单元，并有望将这一策略推广到其他结构和超材料，赋予它们非均匀和梯度的力学性能。(C)2017爱思唯尔有限公司。保留所有权利。
Origami-inspired structures and mechanical metamaterials are often made up of individual tessellating repeat units, the folding and relative geometry of which determine the overall mechanical properties. If these units are identical, then the mechanical behaviour of the structure is uniform throughout, meaning that it is not able to adapt to changeable loading conditions. Here we create and study an origami structure, based on the Miura-ori folding pattern, which has a varying geometry over its volume and graded stiffness. Using kinematic analysis, we show how geometric parameters of the folding pattern can be varied to create both rigid foldable and self locking stages. We demonstrate both experimentally and numerically that the structure can achieve periodically graded stiffness when subjected to quasi-static out-of-plane compression, and the mechanical responses can be tuned by changing the underlying geometric design. We obtain a structure with superior energy absorption capability to uniform tessellating repeat units, and anticipate that this strategy could be extended to other structures and metamaterials to impart them with non-uniform and graded mechanical properties. (C) 2017 Elsevier Ltd. All rights reserved.