Lattice Metamaterials with Mechanically Tunable Poisson's Ratio for Vibration Control
Lattice Metamaterials with Mechanically Tunable Poisson's Ratio for Vibration Control
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DOI：
10.1103/physrevapplied.7.024012
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发表时间：
2017-02-09
影响因子：
4.6
通讯作者：
Wang, Lifeng
中科院分区：
文献类型：
--
作者：
Chen, Yanyu;Li, Tiantian;Wang, Lifeng
具有人工设计结构的超材料越来越被认为是具有不寻常物理性能的新范式材料系统。在这里，我们报告了一类具有机械可调负泊松比和振动缓解能力的结构晶格超材料。所提出的晶格超材料是通过用正弦形状的梁代替规则的直梁来构建的，正弦形状的梁在单轴拉伸下是高度可拉伸的。我们的实验和数值计算结果表明，所提出的晶格表现出极端的泊松比变化之间的-0.7和0.5的大拉伸变形高达50%。泊松比值的这种大的变化归因于正弦形状的梁内从弯曲到拉伸的变形模式切换。多尺度（韧带和细胞）架构和波传播之间的相互作用也使显着的宽带振动缓解能力的晶格超材料，它可以动态调整外部机械刺激。材料设计策略提供了对具有潜在应用的建筑超材料类的发展的见解，包括能量吸收，可调声学，振动控制，响应设备，软机器人和可拉伸电子产品。
Metamaterials with artificially designed architectures are increasingly considered as new paradigmatic material systems with unusual physical properties. Here, we report a class of architected lattice metamaterials with mechanically tunable negative Poisson's ratios and vibration-mitigation capability. The proposed lattice metamaterials are built by replacing regular straight beams with sinusoidally shaped ones, which are highly stretchable under uniaxial tension. Our experimental and numerical results indicate that the proposed lattices exhibit extreme Poisson's-ratio variations between -0.7 and 0.5 over large tensile deformations up to 50%. This large variation of Poisson's-ratio values is attributed to the deformation pattern switching from bending to stretching within the sinusoidally shaped beams. The interplay between the multiscale (ligament and cell) architecture and wave propagation also enables remarkable broadband vibration-mitigation capability of the lattice metamaterials, which can be dynamically tuned by an external mechanical stimulus. The material design strategy provides insights into the development of classes of architected metamaterials with potential applications including energy absorption, tunable acoustics, vibration control, responsive devices, soft robotics, and stretchable electronics.