Liquid Metal‐Polymer Microlattice Metamaterials with High Fracture Toughness and Damage Recoverability,Small

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Liquid Metal‐Polymer Microlattice Metamaterials with High Fracture Toughness and Damage Recoverability
Small ( IF 13.0 ) Pub Date : 2020-10-26 , DOI: 10.1002/smll.202004190
Wenqiang Zhang ₁ , Juzheng Chen ₂ , Xiang Li ₂ , Yang Lu _{1,

2,

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Affiliation

Biological materials exhibit excellent fracture toughness due to their ability to dissipate energy during crack propagating through the combination of various constituents with different stiffnesses. Replicating this mechanism in engineering materials is important in mechanical systems and emerging applications such as flexible electronics and soft robotics. Here a novel liquid metal (LM)‐filled polymer microlattice metamaterial, fabricated by projection micro‐stereolithography (PμSL) 3D printing and vacuum filling of gallium (Ga), exhibiting high fracture toughness of 0.8 MJ m⁻³, is reported. Moreover, the LM metamaterials demonstrate shape memory effect and even essentially recover its original shape upon severe fractures. These unique features arise from the tunable properties of gallium at a relatively low temperature range. The result offers new insights into design and manufacturing mechanical metamaterials with tunable properties and high recoverability for soft robots, flexible electronics, and biomedical applications.

中文翻译：

具有高断裂韧性和损伤修复能力的液态金属聚合物微晶格超材料

由于生物材料通过具有不同刚度的各种成分的组合在裂纹扩展过程中耗散能量的能力，因此它们具有出色的断裂韧性。在工程材料中复制此机制对于机械系统和诸如柔性电子和软机器人等新兴应用非常重要。在此，通过投影微立体光刻（PμSL）3D打印和镓（Ga）真空填充制造的新型液态金属（LM）填充聚合物微晶格超材料，具有0.8 MJ m ^-3的高断裂韧性，已报告。此外，LM超材料表现出形状记忆效果，甚至在严重断裂时甚至可以基本恢复其原始形状。这些独特的特征是由于镓在相对较低的温度范围内具有可调节的特性而产生的。结果为软机器人，柔性电子产品和生物医学应用提供了具有可调性和高可恢复性的机械超材料设计和制造新见解。

更新日期：2020-11-19

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