4D printed shape memory metamaterial for vibration bandgap switching and active elastic-wave guiding
4D printed shape memory metamaterial for vibration bandgap switching and active elastic-wave guiding
复制标题
用于振动带隙切换和主动弹性波导的 4D 打印形状记忆超材料
DOI：
10.1039/d0tc04999a
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发表时间：
2021-01-28
影响因子：
6.4
通讯作者：
Tan, K. T.
中科院分区：
文献类型：
--
作者：
Li, Bing;Zhang, Chao;Tan, K. T.
依赖于工程微结构而不是化学成分的声学/弹性超材料能够实现丰富多样的非凡有效特性，适用于各种应用，包括振动/噪声隔离，高分辨率医学成像以及能量收集和缓解。然而，这些弹性波导的静态性质限制了它们用于主动弹性波导的潜力，因为由于偏振和结构敏感性的相互作用，微结构转变仍然是有效应用于传统弹性超材料的挑战。在这里，提出了一种可调谐的局部谐振结构波导，并基于锌中和的聚（乙烯-共-甲基丙烯酸）离聚物（Surlyn 9910）的3D打印构建块在1000-4000 Hz之间进行主动振动带隙切换和弹性波操纵。离聚物表现出形状记忆行为，以通过施加热刺激来实现重新排列成新的形状图案，所述热刺激在空间和时间维度上调节机械性能（4D超材料）。热诱导的形状重组被编程为将一系列频带从通带翻转到带隙，反之亦然。连续切换带宽可超过500 Hz。因此，将带隙从“开”改变为“关”产生可编程弹性波传播路径以实现有源波导现象。一个各向异性的质量阻尼模型被证明可以预测打印结构的自适应动态响应，分析工作和实验结果之间有很好的一致性。基于可调超材料的波导展示了4D打印形状记忆聚合物在设计和制造弹性波控制和振动隔离智能设备方面的潜力。
Acoustic/elastic metamaterials that rely on engineered microstructures instead of chemical composition enable a rich variety of extraordinary effective properties that are suited for various applications including vibration/noise isolation, high-resolution medical imaging, and energy harvesting and mitigation. However, the static nature of these elastic wave guides limits their potential for active elastic-wave guiding, as microstructure transformation remains a challenge to effectively apply in traditional elastic metamaterials due to the interplay of polarization and structural sensitivity. Here, a tunable, locally resonant structural waveguide is proposed and demonstrated for active vibration bandgap switching and elastic-wave manipulation between 1000-4000 Hz based on 3D printed building blocks of zinc-neutralized poly(ethylene-co-methacrylic acid) ionomer (Surlyn 9910). The ionomer exhibits shape memory behavior to enable rearrangement into new shape patterns through application of thermal stimuli that tunes mechanical performance in both space and time dimensions (4D metamaterial). The thermally induced shape-reorganization is programed to flip a series of frequency bands from passbands to bandgaps and vice versa. The continuously switched bandwidth can exceed 500 Hz. Consequently, altering the bandgap from "on" to "off" produces programmable elastic-wave propagation paths to achieve active wave guiding phenomena. An anisotropic cantilever-in-mass model is demonstrated to predict the self-adaptive dynamic responses of the printed structures with good agreement between the analytical work and experimental results. The tunable metamaterial-based waveguides illustrate the potential of 4D printed shape memory polymers in the designing and manufacturing of intelligent devices for elastic-wave control and vibration isolation.