Reversible energy absorption of elasto-plastic auxetic, hexagonal, and AuxHex structures fabricated by FDM 4D printing

Namvar, N, Zolfagharian, A, Vakili-Tahami, F and Bodaghi, M ORCID: https://orcid.org/0000-0002-0707-944X, 2022. Reversible energy absorption of elasto-plastic auxetic, hexagonal, and AuxHex structures fabricated by FDM 4D printing. Smart Materials and Structures, 31 (5): 055021. ISSN 0964-1726

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Abstract

The present study aims at introducing reconfigurable mechanical metamaterials by utilising four-dimensional (4D) printing process for recoverable energy dissipation and absorption applications with shape memory effects. The architected mechanical metamaterials are designed as a repeating arrangement of re-entrant auxetic, hexagonal, and AuxHex unit-cells and manufactured using 3D printing fused deposition modelling process. The AuxHex cellular structure is composed of auxetic re-entrant and hexagonal components. Architected cellular metamaterials are developed based on a comprehension of the elasto-plastic features of shape memory polylactic acid materials and cold programming deduced from theory and experiments. Computational models based on ABAQUS/Standard are used to simulate the mechanical properties of the 4D-printed mechanical metamaterials under quasi-static uniaxial compression loading, and the results are validated by experimental data. Research trials show that metamaterial with re-entrant auxetic unit-cells has better energy absorption capability compared to the other structures studied in this paper, mainly because of the unique deformation mechanisms of unit-cells. It is shown that mechanical metamaterials with elasto-plastic behaviors exhibit mechanical hysteresis and energy dissipation when undergoing a loading-unloading cycle. It is experimentally revealed that the residual plastic strain and dissipation processes induced by cold programming are completely reversible through simple heating. The results and concepts presented in this work can potentially be useful towards 4D printing reconfigurable cellular structures for reversible energy absorption and dissipation engineering applications.

Item Type:	Journal article
Publication Title:	Smart Materials and Structures
Creators:	Namvar, N., Zolfagharian, A., Vakili-Tahami, F. and Bodaghi, M.
Publisher:	IOP Publishing
Date:	19 April 2022
Volume:	31
Number:	5
ISSN:	0964-1726
Identifiers:	Number Type 10.1088/1361-665x/ac6291 DOI 1542766 Other
Rights:	© 2022 the author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	04 May 2022 15:31
Last Modified:	04 May 2022 15:33
URI:	https://irep.ntu.ac.uk/id/eprint/46250

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