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Guided transition waves in multistable mechanical metamaterials.
Proceedings of the National Academy of Sciences of the United States of America ( IF 11.1 ) Pub Date : 2020-01-22 , DOI: 10.1073/pnas.1913228117
Lishuai Jin 1, 2 , Romik Khajehtourian 3 , Jochen Mueller 1, 4 , Ahmad Rafsanjani 1, 5 , Vincent Tournat 6 , Katia Bertoldi 4, 7, 8 , Dennis M Kochmann 9, 10
Affiliation  

Transition fronts, moving through solids and fluids in the form of propagating domain or phase boundaries, have recently been mimicked at the structural level in bistable architectures. What has been limited to simple one-dimensional (1D) examples is here cast into a blueprint for higher dimensions, demonstrated through 2D experiments and described by a continuum mechanical model that draws inspiration from phase transition theory in crystalline solids. Unlike materials, the presented structural analogs admit precise control of the transition wave's direction, shape, and velocity through spatially tailoring the underlying periodic network architecture (locally varying the shape or stiffness of the fundamental building blocks, and exploiting interactions of transition fronts with lattice defects such as point defects and free surfaces). The outcome is a predictable and programmable strongly nonlinear metamaterial motion with potential for, for example, propulsion in soft robotics, morphing surfaces, reconfigurable devices, mechanical logic, and controlled energy absorption.

中文翻译:

多稳态机械超材料中的导引过渡波。

近来,在双稳态体系结构的结构层面上,模拟了过渡前沿,它们以传播的畴或相边界的形式穿过固体和流体。限于简单的一维(1D)示例在此处被铸成更高尺寸的蓝图,通过2D实验进行演示,并通过连续力学模型进行描述,该模型从晶体固体中的相变理论中汲取了灵感。与材料不同,本发明提出的结构类似物通过空间定制底层周期网络体系结构(局部改变基本构件的形状或刚度,并利用过渡前沿与晶格缺陷的相互作用)来精确控制过渡波的方向,形状和速度。例如点缺陷和自由表面)。
更新日期:2020-02-04
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