Plate-nanolattices at the theoretical limit of stiffness and strength.,Nature Communications

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Plate-nanolattices at the theoretical limit of stiffness and strength.
Nature Communications ( IF 14.7 ) Pub Date : 2020-03-27 , DOI: 10.1038/s41467-020-15434-2
Cameron Crook ₁ , Jens Bauer ₂ , Anna Guell Izard ₂ , Cristine Santos de Oliveira ₃ , Juliana Martins de Souza E Silva ₃ , Jonathan B Berger _{4,

5} , Lorenzo Valdevit _{1,

2}

Affiliation

Though beam-based lattices have dominated mechanical metamaterials for the past two decades, low structural efficiency limits their performance to fractions of the Hashin-Shtrikman and Suquet upper bounds, i.e. the theoretical stiffness and strength limits of any isotropic cellular topology, respectively. While plate-based designs are predicted to reach the upper bounds, experimental verification has remained elusive due to significant manufacturing challenges. Here, we present a new class of nanolattices, constructed from closed-cell plate-architectures. Carbon plate-nanolattices are fabricated via two-photon lithography and pyrolysis and shown to reach the Hashin-Shtrikman and Suquet upper bounds, via in situ mechanical compression, nano-computed tomography and micro-Raman spectroscopy. Demonstrating specific strengths surpassing those of bulk diamond and average performance improvements up to 639% over the best beam-nanolattices, this study provides detailed experimental evidence of plate architectures as a superior mechanical metamaterial topology.

中文翻译：

在刚度和强度的理论极限值下，板状纳诺蒂丝。

尽管基于梁的晶格在过去的二十年中一直占据着机械超材料的主导地位，但低的结构效率将其性能限制在Hashin-Shtrikman和Suquet上限的几分之一，即任何各向同性细胞拓扑的理论刚度和强度极限。尽管预计基于板的设计将达到上限，但是由于重大的制造挑战，实验验证仍然难以实现。在这里，我们介绍了一种由封闭单元板结构构成的新型纳米晶格。通过双光子光刻和热解制备碳板-nanoattiaceces，并通过原位机械压缩，纳米计算机断层扫描和显微拉曼光谱显示达到Hashin-Shtrikman和Suquet上限。

更新日期：2020-04-24

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