Plate-nanolattices at the theoretical limit of stiffness and strength

Cameron Crook, Jens Bauer (), Anna Guell Izard, Cristine Santos de Oliveira, Juliana Martins de Souza e Silva, Jonathan B. Berger and Lorenzo Valdevit
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Cameron Crook: University of California
Jens Bauer: University of California
Anna Guell Izard: University of California
Cristine Santos de Oliveira: Martin-Luther-Universität Halle-Wittenberg
Juliana Martins de Souza e Silva: Martin-Luther-Universität Halle-Wittenberg
Jonathan B. Berger: Nama Development, LLC
Lorenzo Valdevit: University of California

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-15434-2

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