Modular multistable metamaterials with reprogrammable mechanical properties
Modular multistable metamaterials with reprogrammable mechanical properties
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DOI：
10.1016/j.engstruct.2022.114976
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发表时间：
2022-12
影响因子：
5.5
通讯作者：
J. Mao;Shuai Wang;W. Tan;Mingchao Liu
中科院分区：
文献类型：
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作者：
J. Mao;Shuai Wang;W. Tan;Mingchao Liu
多稳态超材料具有优异的力学性能，在工程领域有着广泛的应用前景，近年来引起了学术界和工业界的广泛关注。然而，现有的多稳态超材料的功能是很难调整，一旦制造。为了克服这一局限性，本文提出了一种具有可编程机械性能的模块化多稳态超材料（MMM）的想法，该材料由具有可调跳穿行为的单元组装而成。该单元电池由一个可拆卸的杆和一个固定的框架组成，该框架包含两个弯曲的梁。通过在框架中插入不同长度的杆，我们可以改变曲梁的形状，从而调整单元格的跳变行为，这是其可调多稳定性的基础。我们通过理论分析和数值模拟来评估这些单胞的几何和力学性能的可调性。所获得的定量结果为磁记忆模块的组装提供了设计指导。我们通过3D打印制造了一定数量的组件，并将它们组装成单向MMM，以检查其可重新编程的宏观力学行为。我们首先从实验和数值两方面研究了可调负载-位移响应，然后通过数值模拟探索了可调带隙。最后，我们展示了组装形成双向和三向以及梯度MMM的更广泛的可能性。本文的研究结果对模块化超材料的设计和拓展其在工程结构中的应用前景具有重要意义。
Owing to extensive potential applications in various engineering areas, the multistable metamaterials with remarkable mechanical properties have gained increasing interest from both academia and industry recently. However, the functionality of existing multistable metamaterials is hard to adjust once fabricated. To overcome the limitation, in this paper, we propose an idea of modular multistable metamaterial (MMM) with reprogrammable mechanical properties, which is assembled by unit cells with tunable snap-through behaviours. The unit cell is made by a dismountable bar and a fixed frame containing two bistable curved beams. By inserting the bar with different length into the frame, we can change the shape of curved beams and therefore tune the snap-through behaviour of the unit cell, which lies the foundation of its tunable multistabilities. We evaluate these tunabilities of geometry and mechanical properties of single unit cell by employing theoretical analyses and validate them by numerical simulations. The obtained quantitative results provide us the design guide for assembling of the MMM. We fabricate a certain number of components by 3D printing and assemble them as a unidirectional MMM to examine its reprogrammable macroscopic mechanical behaviours. We firstly investigate the tunable load–displacement responses experimentally and numerically; and then explore the tunable bandgaps through numerical simulations. Finally, we demonstrate the broader possibilities of assembly to form bi- and tri-directional, as well as gradient MMMs. The results presented in this paper have great significance for the design of modular metamaterials and expanding their application prospects in engineering structures.