Self‐Assembled Robust 2D Networks from Magneto‐Elastic Bars
Self‐Assembled Robust 2D Networks from Magneto‐Elastic Bars
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DOI：
10.1002/admt.202202189
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发表时间：
2023-06
影响因子：
6.8
通讯作者：
Xinyan Yang;J. Leng;Cheng Sun;S. Keten
中科院分区：
文献类型：
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作者：
Xinyan Yang;J. Leng;Cheng Sun;S. Keten
磁弹性材料具有形状可编程性、自适应刚度和可调强度等特性，这些特性对于结构和机器人材料的进步至关重要。磁弹性网络通常通过采用嵌入软基体中的硬磁体来构成整体来制造。这些架构的网络材料具有优异的机械性能，但在极端负载情况下造成的损坏是永久性的。为了克服这一限制，我们提出了一种末端带有永久固定偶极磁体的弹性杆的新颖设计，并证明了它们在随机振动下自组装成磁弹性网络的能力。磁弹性单元配置，最显着的是末端偶极子的方向，被证明决定了自组装网络拓扑，其范围可以从准有序三角形晶格到粒子堆叠或串。通过单轴拉伸试验探讨网络力学，并建立形成稳定的轻量级二维网络的设计标准。结果表明，这些磁弹性网络在大激励下在其磁节点处重新排列和优雅地断裂，但在中等随机激励下恢复其原始结构。这项工作为可以通过随机振动进行自组装和即时修复的结构材料铺平了道路，并拓宽了磁弹性软材料的应用。
Magneto‐elastic materials facilitate features such as shape programmability, adaptive stiffness, and tunable strength, which are critical for advances in structural and robotic materials. Magneto‐elastic networks are commonly fabricated by employing hard magnets embedded in soft matrices to constitute a monolithic body. These architected network materials have excellent mechanical properties but damage incurred in extreme loading scenarios are permanent. To overcome this limitation, we present a novel design for elastic bars with permanent fixed dipole magnets at their ends and demonstrate their ability to self‐assemble into magneto‐elastic networks under random vibrations. The magneto‐elastic unit configuration, most notably the orientation of end dipoles, is shown to dictate the self‐assembled network topology, which can range from quasi‐ordered triangular lattices to stacks or strings of particles. Network mechanics are probed with uniaxial tensile tests and design criteria for forming stable lightweight 2D networks are established. It is shown that these magneto‐elastic networks rearrange and break gracefully at their magnetic nodes under large excitations and yet recover their original structure at moderate random excitations. This work paves the way for structural materials that can be self‐assembled and repaired on‐the‐fly with random vibrations, and broadens the applications of magneto‐elastic soft materials.