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Modelling the creep of open-cell polymer foams

Zhu, Hanxing ORCID: 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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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: 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

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