Perez-Garcia Carlos, Zaera Ramon, Aranda-Ruiz Josue, Bordiga Giovanni, Risso Giada, Lopez-Donaire Maria Luisa, Bertoldi Katia, Garcia-Gonzalez Daniel
Department of Continuum Mechanics and Structural Analysis, Universidad Carlos III de Madrid, Calle Butarque 15, Leganes, 28911, Madrid, Spain.
School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA.
Adv Mater. 2025 Jun;37(24):e2412353. doi: 10.1002/adma.202412353. Epub 2025 Apr 16.
This study experimentally demonstrates the reprogrammability of a rotating-squares-based mechanical metamaterial with an embedded array of permanent magnets. How the orientation, residual magnetization, and stiffness of the magnets influence both the static and dynamic responses of the metamaterial is systematically investigated. It is showed that by carefully tuning the magnet orientation within the metamaterial, notable tunability of the metamaterial response can be achieved across static and dynamic regimes. More complex magnetic node configurations can optimize specific structural responses by decoupling the tunability of quasi-static stress-strain behavior from energy absorption under impact loading. Additionally, reprogrammability can be further enhanced by an external magnetic field, which modulates magnetic interactions within the structure. This work paves the way for developing engineered structural components with adaptable mechanical responses, reprogrammable through either the redistribution of magnetic elements or the application of an external magnetic field.
本研究通过实验证明了一种基于旋转方块的机械超材料与嵌入式永磁体阵列的可重新编程性。系统地研究了磁体的取向、剩余磁化强度和刚度如何影响超材料的静态和动态响应。结果表明，通过仔细调整超材料内磁体的取向，可以在静态和动态状态下实现超材料响应的显著可调性。更复杂的磁节点配置可以通过将准静态应力-应变行为的可调性与冲击载荷下的能量吸收解耦来优化特定的结构响应。此外，外部磁场可以进一步增强可重新编程性，该磁场可调节结构内的磁相互作用。这项工作为开发具有适应性机械响应的工程结构部件铺平了道路，这些部件可通过重新分布磁性元件或施加外部磁场进行重新编程。
