Tuning Buckling Behaviors in Magnetically Active Structures: Topology Optimization and Experimental Validation
Tuning Buckling Behaviors in Magnetically Active Structures: Topology Optimization and Experimental Validation
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调整磁活性结构中的屈曲行为：拓扑优化和实验验证
DOI：
10.1115/1.4062536
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Zhang, Xiaojia Shelly
中科院分区：
文献类型：
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作者：
Zhao, Zhi;Wang, Chao;Zhang, Xiaojia Shelly
屈曲，一种历史上被认为是不受欢迎的现象，最近被利用来实现材料和结构的创新功能。虽然实现特定屈曲行为的方法被广泛研究，但在不改变其几何形状的情况下调整装配结构中的这些行为仍然是一个重大挑战。在这里，我们介绍了一种逆设计方法来调整屈曲行为的磁有源结构，通过施加的磁刺激的变化。我们提出的磁力学拓扑优化公式不仅生成这些结构的几何形状和磁化分布，而且还告知如何施加外部磁场来控制其屈曲行为。通过利用所提出的策略，我们发现磁活性结构展示了广泛的可调屈曲机制，包括可编程的峰值力和屈曲位移，以及可控的机械和磁致双稳态。此外，我们的实验表明，多个单元的设计可以组装成架构，导致可调的多稳定性和可编程的屈曲序列下不同的施加磁场。通过采用混合制造方法，我们制造和实验验证所产生的设计和架构，确认他们的能力，表现出精确的编程和可调屈曲行为。这项研究有助于利用屈曲现象的多功能材料和结构的进步，为各种应用释放变革潜力，包括机器人，能量收集以及可部署和可重构设备。
Buckling, a phenomenon historically considered undesirable, has recently been harnessed to enable innovative functionalities in materials and structures. While approaches to achieve specific buckling behaviors are widely studied, tuning these behaviors in fabricated structures without altering their geometry remains a major challenge. Here, we introduce an inverse design approach to tune buckling behavior in magnetically active structures through the variation of applied magnetic stimuli. Our proposed magneto-mechanical topology optimization formulation not only generates the geometry and magnetization distribution of these structures but also informs how the external magnetic fields should be applied to control their buckling behaviors. By utilizing the proposed strategy, we discover magnetically active structures showcasing a broad spectrum of tunable buckling mechanisms, including programmable peak forces and buckling displacements, as well as controllable mechano- and magneto-induced bistability. Furthermore, we experimentally demonstrate that multiple unit designs can be assembled into architectures, resulting in tunable multistability and programmable buckling sequences under distinct applied magnetic fields. By employing a hybrid fabrication method, we manufacture and experimentally validate the generated designs and architectures, confirming their ability to exhibit precisely programmed and tunable buckling behaviors. This research contributes to the advancement of multifunctional materials and structures that harness buckling phenomena, unlocking transformative potential for various applications, including robotics, energy harvesting, and deployable and reconfigurable devices.