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Imperfection-Enabled Strengthening of Ultra-Lightweight Lattice Materials

Lookup NU author(s): Dr Xinwei LiORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© 2024 The Author(s). Advanced Science published by Wiley-VCH GmbH.Lattice materials are an emerging family of advanced engineering materials with unique advantages for lightweight applications. However, the mechanical behaviors of lattice materials at ultra-low relative densities are still not well understood, and this severely limits their lightweighting potential. Here, a high-precision micro-laser powder bed fusion technique is dveloped that enables the fabrication of metallic lattices with a relative density range much wider than existing studies. This technique allows to confirm that cubic lattices in compression undergo a yielding-to-buckling failure mode transition at low relative densities, and this transition fundamentally changes the usual strength ranking from plate > shell > truss at high relative densities to shell > plate > truss or shell > truss > plate at low relative densities. More importantly, it is shown that increasing bending energy ratio in the lattice through imperfections such as slightly-corrugated geometries can significantly enhance the stability and strength of lattice materials at ultra-low relative densities. This counterintuitive result suggests a new way for designing ultra-lightweight lattice materials at ultra-low relative densities.

Publication metadata

Author(s): Ding J, Ma Q, Li X, Zhang L, Yang H, Qu S, Wang MY, Zhai W, Gao H, Song X

Publication type: Article

Publication status: Published

Journal: Advanced Science

Year: 2024

Volume: 11

Issue: 41

Print publication date: 06/11/2024

Online publication date: 16/09/2024

Acceptance date: 02/04/2018

Date deposited: 24/09/2024

ISSN (print): 2198-3844

ISSN (electronic): 2198-3844

Publisher: John Wiley and Sons Inc

URL: https://doi.org/10.1002/advs.202402727

DOI: 10.1002/advs.202402727

Data Access Statement: The data that support the findings of this study are available from the corresponding authors upon reasonable request

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