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Lookup NU author(s): Dr Xinwei LiORCiD
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© 2024 Wiley-VCH GmbH.Characterized by periodic cellular unit cells, microlattices offer exceptional potential as lightweight and robust materials. However, their inherent periodicity poses the risk of catastrophic global failure. To address this limitation, a novel approach, that is to introduce microlattices composed of aperiodic unit cells inspired by Einstein's tile, where the orientation of cells never repeats in the same orientation is proposed. Experiments and simulations are conducted to validate the concept by comparing compressive responses of the aperiodic microlattices with those of common periodic microlattices. Indeed, the microlattices exhibit stable and progressive compressive deformation, contrasting with catastrophic fracture of periodic structures. At the same relative density, the microlattices outperform the periodic ones, exhibiting fracture strain, energy absorption, crushing stress efficiency, and smoothness coefficients at least 830%, 300%, 130%, and 160% higher, respectively. These improvements can be attributed to aperiodicity, where diverse failure thresholds exist locally due to varying strut angles and contact modes during compression. This effectively prevents both global fracture and abrupt stress drops. Furthermore, the aperiodic microlattice exhibits good damage tolerance with excellent deformation recoverability, retaining 76% ultimate stress post-recovery at 30% compressive strain. Overall, a novel concept of adopting aperiodic cell arrangements to achieve damage-tolerant microlattice metamaterials is presented.
Author(s): Wang X, Li X, Li Z, Wang Z, Zhai W
Publication type: Article
Publication status: Published
Journal: Small
Year: 2024
Pages: epub ahead of print
Online publication date: 06/01/2024
Acceptance date: 02/04/2018
ISSN (print): 1613-6810
ISSN (electronic): 1613-6829
Publisher: Sage Publications Ltd
URL: https://doi.org/10.1002/smll.202307369
DOI: 10.1002/smll.202307369
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