Fabrication, characterisation and analytical modelling of gradient auxetic closed cell foams

DUNCAN, Olly, ALDERSON, Andrew and ALLEN, Tom (2021). Fabrication, characterisation and analytical modelling of gradient auxetic closed cell foams. Smart Materials and Structures.

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Abstract

Auxetic (negative Poisson's ratio) and gradient open cell foams have shown promise for their conformability and high impact energy absorption – useful in applications like protective equipment, footwear and prosthetics. Recent methods fabricated closed cell auxetic foam by steaming conventional closed cell foam. Methods developed herein control the cell structure of auxetic closed cell foam, to produce novel intentionally anisotropic and gradient auxetic closed cell foam. Pins passed through the foam constrained or stretched regions during steaming to further modify cell structure and impart gradients in cell structure, Young's modulus and Poisson's ratios. Fabricated foams had Poisson's ratios between 1 and -1. Imparted Young's moduli of 1 to 12 MPa were similar to foams used in footwear, prosthesis, helmets and other impact protection. The effect of changes to cell structure on Young's moduli and Poisson's ratio are explained by combining analytical models of auxetic open cell and conventional closed cell foam.

Item Type:	Article
Uncontrolled Keywords:	03 Chemical Sciences; 09 Engineering; Materials
Identification Number:	https://doi.org/10.1088/1361-665x/abdc06
SWORD Depositor:	Symplectic Elements
Depositing User:	Symplectic Elements
Date Deposited:	03 Feb 2021 11:27
Last Modified:	14 Jan 2022 01:18
URI:	https://shura.shu.ac.uk/id/eprint/28069

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