Local resonance bandgap control in a particle-aligned magnetorheological metamaterial
Local resonance bandgap control in a particle-aligned magnetorheological metamaterial
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DOI：
10.1038/s43246-023-00419-7
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发表时间：
2023-11
影响因子：
7.8
通讯作者：
M. Moghaddaszadeh;Andrew Ragonese;Yong Hu;Zipeng Guo;Amjad Aref;Chi Zhou;Shenqiang Ren;M. Nouh
中科院分区：
文献类型：
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作者：
M. Moghaddaszadeh;Andrew Ragonese;Yong Hu;Zipeng Guo;Amjad Aref;Chi Zhou;Shenqiang Ren;M. Nouh
刺激响应弹性超材料增强了独特的亚波长特征和波操纵能力，具有一定程度的可调谐性，这使它们能够跨越不同的时间尺度和频率范围。在这里，我们提出了一个实验框架，强大的局部共振带隙控制，使磁流变弹性体的增强磁-机械耦合特性，作为超材料细胞的共振刚度。在固化过程中，弹性体基质中的铁磁颗粒在外部磁场的作用下排列。结果，具有优选取向的颗粒链沿场方向形成沿着。所得到的各向异性行为显著地提高了超材料的弹性模量对操作期间所施加的场的灵敏度，然后利用该灵敏度来控制色散动力学并且实验性地沿着频率轴移动基于谐振的带隙的位置和宽度沿着。最后，数值模拟被用来预测在更强的磁场和增加的材料各向异性水平的磁可调超材料的性能，作为更广泛的实施方案的蓝图原位可调有源超材料。
Stimuli-responsive elastic metamaterials augment unique subwavelength features and wave manipulation capabilities with a degree of tunability, which enables them to cut across different time scales and frequency regimes. Here, we present an experimental framework for robust local resonance bandgap control enabled by enhanced magneto-mechanical coupling properties of a magnetorheological elastomer, serving as the resonating stiffness of a metamaterial cell. During the curing process, ferromagnetic particles in the elastomeric matrix are aligned under the effect of an external magnetic field. As a result, particle chains with preferred orientation form along the field direction. The resulting anisotropic behavior significantly boosts the sensitivity of the metamaterial’s elastic modulus to the imposed field during operation, which is then exploited to control the dispersive dynamics and experimentally shift the location and width of the resonance-based bandgap along the frequency axis. Finally, numerical simulations are used to project the performance of the magnetically-tunable metamaterial at stronger magnetic fields and increased levels of material anisotropy, as a blueprint for broader implementations of in situ tunable active metamaterials.