3D-printed bio-inspired zero Poisson's ratio graded metamaterials with high energy absorption performance

Hamzehei, R., Zolfagharian, A., Dariushi, S. and Bodaghi, M. ORCID: 0000-0002-0707-944X, 2022. 3D-printed bio-inspired zero Poisson's ratio graded metamaterials with high energy absorption performance. Smart Materials and Structures, 31 (3): 035001. ISSN 0964-1726

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This study aims at introducing a number of two-dimensional (2D) re-entrant based zero Poisson's ratio (ZPR) graded metamaterials for energy absorption applications. The metamaterials' designs are inspired by the 2D image of a DNA molecule. This inspiration indicates how a re-entrant unit cell must be patterned along with the two orthogonal directions to obtain a ZPR behavior. Also, how much metamaterials' energy absorption capacity can be enhanced by taking slots and horizontal beams into account with the inspiration of the DNA molecule's base pairs. The ZPR metamaterials comprise multi-stiffness unit cells, so-called soft and stiff re-entrant unit cells. The variability in unit cells' stiffness is caused by the specific design of the unit cells. A finite element analysis (FEA) is employed to simulate the deformation patterns of the ZPRs. Following that, meta-structures are fabricated with 3D printing of TPU as hyperelastic materials to validate the FEA results. A good correlation is observed between FEA and experimental results. The experimental and numerical results show that due to the presence of multi-stiffness re-entrant unit cells, the deformation mechanisms and the unit cells' densifications are adjustable under quasi-static compression. Also, the structure designed based on the DNA molecule's base pairs, so-called structure F‴, exhibits the highest energy absorption capacity. Apart from the diversity in metamaterial unit cells' designs, the effect of multi-thickness cell walls is also evaluated. The results show that the diversity in cell wall thicknesses leads to boosting the energy absorption capacity. In this regard, the energy absorption capacity of structure 'E' enhances by up to 33% than that of its counterpart with constant cell wall thicknesses. Finally, a comparison in terms of energy absorption capacity and stability between the newly designed ZPRs, traditional ZPRs, and auxetic metamaterial is performed, approving the superiority of the newly designed ZPR metamaterials over both traditional ZPRs and auxetic metamaterials.

Item Type: Journal article
Publication Title: Smart Materials and Structures
Creators: Hamzehei, R., Zolfagharian, A., Dariushi, S. and Bodaghi, M.
Publisher: IOP Publishing
Date: 21 January 2022
Volume: 31
Number: 3
ISSN: 0964-1726
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 licence. 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: Linda Sullivan
Date Added: 24 Jan 2022 12:45
Last Modified: 24 Jan 2022 12:45
URI: https://irep.ntu.ac.uk/id/eprint/45399

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