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Effect of water content on the constitutive response of a cellulose foam

Published version
Peer-reviewed

Repository DOI


Type

Article

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Authors

Cheng, L 
Deshpande, V 

Abstract

Cellulose foams can undergo a large one-way actuation strain when taken from a dry, pre-compressed state to a damp state by the addition of water. In order to develop a predictive capability for the 3D actuation of a foam-based structure with a non-uniform water concentration, it is first necessary to understand the mechanical properties of the foam (including actuation strain) as a function of water content. Here, we report the anisotropic constitutive response of a cellulose foam as a function of water content. Over the range of strain rate and water content considered, the cellulose foam is adequately approximated by a visco-plastic, transversely isotropic, compressible constitutive model. Unloading from the plastic state by a stress drop equal to the initial yield stress leads to reversed plastic flow: this is an extreme form of kinematic hardening.

Description

Keywords

Cellulose foams, Anisotropy, Constitutive model, Soft solid, Actuation strain, Non-linear kinematic hardening

Journal Title

European Journal of Mechanics, A/Solids

Conference Name

Journal ISSN

0997-7538
1873-7285

Volume Title

100

Publisher

Elsevier BV