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A mathematical model for the auxetic response of liquid crystal elastomers

Mihai, L. Angela ORCID:, Mistry, Devesh, Raistrick, Thomas, Gleeson, Helen F. and Goriely, Alain 2022. A mathematical model for the auxetic response of liquid crystal elastomers. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 380 , 20210326. 10.1098/rsta.2021.0326

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We develop a mathematical model that builds on the surprising nonlinear mechanical response observed in recent experiments on nematic liquid crystal elastomers. Namely, under uniaxial tensile loads, the material, rather than thinning in the perpendicular directions, becomes thicker in one direction for a sufficiently large strain, while its volume remains unchanged. Motivated by this unusual large-strain auxetic behaviour, we model the material using an Ogden-type strain-energy function and calibrate its parameters to available datasets. We show that Ogden strain-energy functions are particularly suitable for modelling nematic elastomers because of their mathematical simplicity and their clear formulation in terms of the principal stretches, which have a direct kinematic interpretation. This article is part of the theme issue ‘The Ogden model of rubber mechanics: Fifty years of impact on nonlinear elasticity’.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Mathematics
Additional Information: Published by the Royal Society under the terms of the Creative Commons Attribution License by/4.0/
Publisher: The Royal Society
ISSN: 1364-503X
Funders: Engineering and Physical Sciences Research Council
Date of First Compliant Deposit: 20 February 2022
Date of Acceptance: 20 February 2022
Last Modified: 02 May 2023 23:25

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