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Totimorphic assemblies from neutrally stable units [Engineering]
Proceedings of the National Academy of Sciences of the United States of America ( IF 11.1 ) Pub Date : 2021-10-19 , DOI: 10.1073/pnas.2107003118
Gaurav Chaudhary 1 , S Ganga Prasath 1 , Edward Soucy 2 , L Mahadevan 2, 3, 4, 5
Affiliation  

Inspired by the quest for shape-shifting structures in a range of applications, we show how to create morphable structural materials using a neutrally stable unit cell as a building block. This unit cell is a self-stressed hinged structure with a one-parameter family of morphing motions that are all energetically equivalent. However, unlike kinematic mechanisms, the unit cell is not infinitely floppy and instead exhibits a tunable mechanical response akin to that of an ideal rigid-plastic material. Theory and simulations allow us to explore the properties of planar and spatial assemblies of neutrally stable elements, and solve the inverse problem of designing assemblies that can morph from one given shape into another. Simple experimental prototypes of these assemblies corroborate our theoretical results and show that the addition of switchable hinges allows us to create load-bearing structures. Altogether, totimorphs pave the way for structural materials whose geometry and deformation response can be controlled independently and at multiple scales.



中文翻译:

来自中性稳定单元的全形组件[工程]

受在一系列应用中寻求变形结构的启发,我们展示了如何使用中性稳定的晶胞作为构建块来创建可变形结构材料。该晶胞是一个自应力铰链结构,具有一个参数族的变形运动,它们在能量上都是等效的。然而,与运动学机制不同的是,晶胞并不是无限松软的,而是表现出类似于理想刚性塑料材料的可调机械响应。理论和模拟使我们能够探索中性稳定元素的平面和空间组件的特性,并解决设计可以从一种给定形状变成另一种形状的组件的逆问题。这些组件的简单实验原型证实了我们的理论结果,并表明添加可切换铰链使我们能够创建承重结构。总而言之,totimorphs 为结构材料铺平了道路,其几何形状和变形响应可以在多个尺度上独立控制。

更新日期:2021-10-15
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