Enhanced energy absorption performance of 3D printed 2D auxetic lattices

Choudhry, N. K., Panda, B. and Kumar, S. (2023) Enhanced energy absorption performance of 3D printed 2D auxetic lattices. Thin-Walled Structures, 186, 110650. (doi: 10.1016/j.tws.2023.110650)

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Abstract

Auxetic lattices have attracted increasing attention due to their unusual mechanical behavior and potential for an array of applications. However, a narrow window of stiffness realizable for a given cell topology limits their applications. In this study, a pair of novel 2D re-entrant auxetic lattices capable of exhibiting enhanced stiffness and energy absorption is proposed by introducing vertical ligaments into conventional re-entrant structures. These modified re-entrant auxetic lattices were realized via fused deposition additive manufacturing. The deformation patterns and the energy absorption characteristics of 3D printed auxetic lattices under quasi-static compression were investigated both via Finite Element (FE) simulations and experiments. The effective elastic stiffness of the proposed lattices was theoretically estimated. The FE results corroborated by experiments, elucidate the role of different sub-cells on the effective mechanical properties of the proposed auxetic lattices. The results indicate that the proposed structures — Type A and B variants, exhibit enhanced stiffness (+355%) and superior energy absorption (+165%) in comparison to conventional 2D re-entrant lattices of the same mass. Furthermore, the findings of the study suggest that the strength, stiffness, energy absorption capacity and Poisson’s ratio of 2D auxetic lattices can be tailored by tuning the sub-cell properties and cell wall thickness.

Item Type:Articles
Additional Information:BP would like to thank Science and Engineering Research Board (SERB), India for the start-up grant [award no: SRG/2021/000052]. S.K. would like to thank the University of Glasgow, United Kingdom for the start-up grant (Award No: 144690-1).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kumar, Professor Shanmugam
Creator Roles:
Kumar, S.Writing – review and editing
Authors: Choudhry, N. K., Panda, B., and Kumar, S.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Thin-Walled Structures
Publisher:Elsevier
ISSN:0263-8231
ISSN (Online):1879-3223
Published Online:16 March 2023
Copyright Holders:Copyright © 2023 The Authors
First Published:First published in Thin-Walled Structures 186: 110650
Publisher Policy:Reproduced under a Creative Commons License

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