Modelling the creep of open-cell polymer foams

Zhu, Hanxing ORCID: https://orcid.org/0000-0002-3209-6831 and Mills, N.J. 1999. Modelling the creep of open-cell polymer foams. Journal of the Mechanics and Physics of Solids 47 (7) , pp. 1437-1457. 10.1016/S0022-5096(98)00116-1

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Abstract

The high-strain creep of open-cell low-density polymer foams is analysed using linearviscoelasticity theory. The microstructure is represented by the Kelvin foam, a regular lattice oftetrakaidecahedral cells. Compressive creep curves are predicted from the measured stressrelaxation modulus of a polyurethane (PU) and the foam density. Geometric non-linearitydevelops as some cell edges become S-shaped, causing the creep rate to increase. The low-straincreep response can be predicted accurately. The response for strains between 10 and 50% is qualitatively correct, but the Kelvin foam, if it maintains its initial symmetry when compressedin the [001] lattice direction, has less geometric non-linearity than the irregular PU foam. Abuckling mode is proposed which would cause increased geometric non-linearity. Polymernon-linearity also contributes to the medium strain creep response of some low-density PUfoams.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords:	A Buckling; Creep; B Finite deformations; Foam material; Polymeric material.
Publisher:	Elsevier
ISSN:	0022-5096
Last Modified:	27 Oct 2022 09:07
URI:	https://orca.cardiff.ac.uk/id/eprint/64467

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