Ultrahigh Energy Absorption Multifunctional Spinodal Nanoarchitectures
Ultrahigh Energy Absorption Multifunctional Spinodal Nanoarchitectures
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DOI：
10.1002/smll.201903834
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发表时间：
2019-09-18
期刊：
影响因子：
13.3
通讯作者：
Valdevit, Lorenzo
中科院分区：
文献类型：
--
作者：
Izard, Anna Guell;Bauer, Jens;Valdevit, Lorenzo
纳米晶格被推广为下一代多功能高性能材料，但其机械响应仅限于极强但脆性，或极强的变形能力但低强度和刚度。理想的冲击保护系统需要在长变形范围内保持高应力平台，以最大限度地吸收能量。在这里，玻璃碳纳米旋节，即，纳米结构与spinodal壳拓扑结构，结合了低能量吸收和特殊的强度和刚度在低重量。显示了高达80%应变的非灾难性变形和比其他纳米、微米、宏观架构和固体高一个数量级的能量吸收以及最先进的冲击保护结构。同时，其强度和刚度与最先进但易碎的纳米晶格相当，展示了真正的多功能性。有限元模拟表明，优化的壳厚曲率半径比抑制灾难性的故障，阻碍危险的定向裂纹的传播。与大多数微米和纳米结构的材料相比，旋节结构可以在工业规模上容易地制造，并且可以成为用于结构应用的下一代上级蜂窝材料。
Nanolattices are promoted as next-generation multifunctional high-performance materials, but their mechanical response is limited to extreme strength yet brittleness, or extreme deformability but low strength and stiffness. Ideal impact protection systems require high-stress plateaus over long deformation ranges to maximize energy absorption. Here glassy carbon nanospinodals, i.e., nanoarchitectures with spinodal shell topology, combining ultrahigh energy absorption and exceptional strength and stiffness at low weight. Noncatastrophic deformation up to 80% strain, and energy absorption up to one order of magnitude higher than for other nano-, micro-, macro-architectures and solids, and state-of-the-art impact protection structures are shown. At the same time, the strength and stiffness are on par with the most advanced yet brittle nanolattices, demonstrating true multifunctionality. Finite element simulations show that optimized shell thickness-to-curvature-radius ratios suppress catastrophic failure by impeding propagation of dangerously oriented cracks. In contrast to most micro- and nano-architected materials, spinodal architectures may be easily manufacturable on an industrial scale, and may become the next generation of superior cellular materials for structural applications.