Reprogrammable flexible mechanical metamaterials
Reprogrammable flexible mechanical metamaterials
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DOI：
10.1016/j.apmt.2022.101662
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发表时间：
2022-12
影响因子：
8.3
通讯作者：
Xiaoyang Zheng;K. Uto;Wei-Hsun Hu;Ta-Te Chen;M. Naito;I. Watanabe
中科院分区：
文献类型：
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作者：
Xiaoyang Zheng;K. Uto;Wei-Hsun Hu;Ta-Te Chen;M. Naito;I. Watanabe
机械超材料是具有结构依赖特性的人工结构。它们通常利用零能量变形模式，例如，单一形状的变化限制了它们的应用，导致需要可变的机械响应。我们通过使用一种称为光响应形状记忆聚二甲基硅氧烷（SM-PDMS）的柔性材料来解决这一限制，将可编程性引入柔性机械超材料中。SM-PDMS是一种具有形状记忆和光热效应的类橡胶功能材料。具体来说，我们提出了三种具有不同力学响应的不同可编程SM-PDMS超材料，即auxetic SM-PDMS，手性SM-PDMS和屈曲诱导SM-PDMS。最后，利用屈曲诱导SM-PDMS制作具有可重新编程首选运动方向的软执行器。尽管我们的研究重点是利用光致SM效应对柔性超材料进行重新编程，但我们的策略可以很容易地扩展到其他结构和智能材料。更重要的是，我们的策略为改变类似架构的机械响应铺平了道路。此外，我们设计的柔性超材料具有不同应用的潜力，例如软体机器人，驱动，自适应安全性和运动设备。
Mechanical metamaterials are artificial structures with structure-dependent properties. They often harness zero-energy deformation modes, e.g., a single shape change that limits their applications, resulting in the need for changeable mechanical responses. We address this limitation by using a flexible material, called light-responsive shape-memory polydimethylsiloxane (SM-PDMS), to introduce reprogrammability into flexible mechanical metamaterials. The SM-PDMS is a rubber-like functional material with shape-memory and photothermal effects. Specfically, we propose three different reprogrammable SM-PDMS metamaterials with different mechanical responses, namely, an auxetic SM-PDMS, a chiral SM-PDMS, and a buckling-induced SM-PDMS. Finally, a buckling-induced SM-PDMS was harnessed to make a soft actuator with a reprogrammable preferred locomotion direction. Despite focusing on reprogramming flexible metamaterials using the light-induced SM effect, our strategy can be easily extended to other structures and smart materials. More importantly, our strategy paves the way to change the mechanical responses for similar architectures. Furthermore, our designed flexible metamaterials have the potential for different applications, such as soft robots, actuation, adaptive safety, and sports equipment.