Plate-nanolattices at the theoretical limit of stiffness and strength
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 27, 2020
- Source ID
- 10.1038/s41467-020-15434-2
Entities
People
- Anna Guell Izard
- Cameron Crook
- Cristine Santos De Oliveira
- Jens Bauer
- Jonathan B. Berger
- Juliana Martins de Souza e Silva
- Lorenzo Valdevit
Organizations
- German Research Foundation
- Office of Naval Research