Hierarchical network structural composites for extraordinary energy dissipation inspired by the cat paw
Hierarchical network structural composites for extraordinary energy dissipation inspired by the cat paw
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DOI：
10.1016/j.apmt.2021.101222
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发表时间：
2021-10-22
影响因子：
8.3
通讯作者：
Peng, Hua-Xin
中科院分区：
文献类型：
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作者：
Lu, Wenjiang;Zhang, Qicheng;Peng, Hua-Xin
众所周知，猫的“九条命”是由于猫能够承受跳跃和从高楼上福尔斯坠落而不受致命伤害的能力，这在很大程度上是由于它们的抗冲击爪垫。该垫具有多尺度胶原纤维网络和脂肪团腔室的复杂结构。本文提出了一种分层复合材料的概念，该复合材料由多孔聚氨酯（PU）的主网络骨架涂有氧化石墨烯（GO）/多壁碳纳米管（MWCNTs），冻干构建的二级膜网络配置与GO/MWCNTs，并嵌入在聚硼二甲基硅氧烷（PBDMS）矩阵。该复合材料的设计灵感来自猫爪中存在的胶原蛋白的结构，并且该复合材料提供显著的抗蠕变性、承载性、形状恢复性以及刚度定制。更重要的是，分级复合材料在准静态循环压缩和动态机械载荷如振动（阻尼能力：与纯基体相比增加160%）和冲击（冲击能量吸收：类似于100%）期间具有显著的高能量耗散。在有限元模拟的支持下，多尺度变形机制进行了分析和讨论。在复合材料的制造过程中产生的主要纤维和次级膜状网络充当对脂质样基质的多尺度限制，使得具有可逆B-O键的基质可以显著地有助于不寻常的能量耗散特性。与猫爪类似，分层复合材料也是柔软的，灵活的，并在运动和广泛的工程应用中显示出安全穿戴设备的巨大潜力。(C)2021爱思唯尔有限公司保留所有权利。
The proverbial "nine lives" of cats are attributed to the capacity of the felines to withstand jumps and falls from a high-rise without being fatally wounded, and this is due in large part to their impact-resistant paw pads. The pads possess a complex architecture of multiscale collagen fiber networks and adipose mass chambers. We propose in this paper the concept of a hierarchical composite made of porous polyurethane (PU) main network skeletons coated with graphene oxide (GO)/multiwalled carbon nanotubes (MWCNTs), freeze-dry constructed secondary membrane network configurations with GO/MWCNTs, and embedded in a polyborondimethylsiloxane (PBDMS) matrix. The design of the composite is inspired by the architectures of collagens present in the cat paw and the composites provide significant creep resistance, load bearing, shape recovery and also stiffness tailoring. More importantly, the hierarchical composites possess remarkable high energy dissipations during quasi-static cyclic compression and dynamic mechanical loadings as vibration (damping capacity: 160% increase compared to the pure matrix) and impact (impacting energy absorption: similar to 100%). The multiscale deformation mechanisms are analyzed and discussed with the support of finite element simulations. The main fibrous and secondary membranous networks generated during the manufacturing of the composite act as multiscale confinements to the lipid-like matrix, so that the matrix with reversible B-O bonds can significantly contribute to the unusual energy dissipation characteristics. Similar to the cat paws, the hierarchical composites are also soft, flexible and show significant potential for safety wearing devices in sport and broad engineering applications. (C) 2021 Elsevier Ltd. All rights reserved.