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arXiv 2409.01533cond-mat.softphysics.app-ph
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双网络启发的机械元材料

Double-network-inspired mechanical metamaterials

Massachusetts Institute of Technology(麻省理工学院)

James Utama Surjadi, Bastien F. G. Aymon, Molly Carton, Carlos M. Portela

AI总结:

本文提出双网络启发的机械元材料,通过结合单体桁架(刚性)和编织(柔性)组件,实现了比纯编织和桁架组件高十倍的刚度和伸展性,同时通过内部缺陷增强能量耗散。

摘要:

机械元材料以其在低密度下实现高刚度和强度而闻名,通常以牺牲低延展性和可拉伸性为代价。相比之下,双网络水凝胶等材料具有相互穿插的柔性和刚性聚合物网络,展现出前所未有的高刚度和可拉伸性组合,从而具有优异的韧性。本文提出双网络启发(DNI)的元材料,通过将单体桁架(刚性)和编织(柔性)组件整合到元材料架构中,实现了比其纯编织和桁架对应物高十倍的刚度和可拉伸性。非线性计算力学模型表明,这些DNI元材料中增强的能量耗散源于由于两个网络之间纠缠增加的摩擦耗散。通过引入通常会降低机械性能的内部缺陷,我们展示了这些元材料通过失效局部化实现了三倍的能量耗散增加。本工作为受聚合物网络拓扑结构启发的高可变形 regime 中开发新类元材料开辟了途径。

英文摘要:

Mechanical metamaterials are renowned for their ability to achieve high stiffness and strength at low densities, often at the expense of low ductility and stretchability-a persistent trade-off in materials. In contrast, materials such as double-network hydrogels feature interpenetrating compliant and stiff polymer networks, and exhibit unprecedented combinations of high stiffness and stretchability, resulting in exceptional toughness. Here, we present double-network-inspired (DNI) metamaterials by integrating monolithic truss (stiff) and woven (compliant) components into a metamaterial architecture, which achieve a tenfold increase in stiffness and stretchability compared to their pure woven and truss counterparts, respectively. Nonlinear computational mechanics models elucidate that enhanced energy dissipation in these DNI metamaterials stems from increased frictional dissipation due to entanglements between the two networks. Through introduction of internal defects, which typically degrade mechanical properties, we demonstrate an opposite effect of a threefold increase in energy dissipation for these metamaterials via failure delocalization. This work opens avenues for developing new classes of metamaterials in a high-compliance regime inspired by polymer network topologies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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