Tuning the performance of metallic auxetic metamaterials by using buckling and plasticity

Ghaedizadeh, A, Shen, J, Ren, X and Xie, Y 2016, 'Tuning the performance of metallic auxetic metamaterials by using buckling and plasticity', Materials, vol. 9, no. 1, pp. 1-17.

Document type: Journal Article
Collection: Journal Articles

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Title Tuning the performance of metallic auxetic metamaterials by using buckling and plasticity
Author(s) Ghaedizadeh, A
Shen, J
Ren, X
Xie, Y
Year 2016
Journal name Materials
Volume number 9
Issue number 1
Start page 1
End page 17
Total pages 17
Publisher MDPI AG
Abstract Metallic auxetic metamaterials are of great potential to be used in many applications because of their superior mechanical performance to elastomer-based auxetic materials. Due to the limited knowledge on this new type of materials under large plastic deformation, the implementation of such materials in practical applications remains elusive. In contrast to the elastomer-based metamaterials, metallic ones possess new features as a result of the nonlinear deformation of their metallic microstructures under large deformation. The loss of auxetic behavior in metallic metamaterials led us to carry out a numerical and experimental study to investigate the mechanism of the observed phenomenon. A general approach was proposed to tune the performance of auxetic metallic metamaterials undergoing large plastic deformation using buckling behavior and the plasticity of base material. Both experiments and finite element simulations were used to verify the effectiveness of the developed approach. By employing this approach, a 2D auxetic metamaterial was derived from a regular square lattice. Then, by altering the initial geometry of microstructure with the desired buckling pattern, the metallic metamaterials exhibit auxetic behavior with tuneable mechanical properties. A systematic parametric study using the validated finite element models was conducted to reveal the novel features of metallic auxetic metamaterials undergoing large plastic deformation. The results of this study provide a useful guideline for the design of 2D metallic auxetic metamaterials for various applications.
Subject Structural Engineering
Keyword(s) Auxetic
Large deformation
Mechanical metamaterial
DOI - identifier 10.3390/ma9010054
Copyright notice © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
ISSN 1996-1944
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