Dean, G D; McCartney, L N; Mera, R D; Urquhart, J M (2011) Modelling non-linear viscoelasticity in polymers for design using finite element analysis. Polym. Eng. Sci., 51 (11). pp. 2210-2219.

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Abstract

A non-linear viscoelastic model is described that can predict the time-dependent deformation of a polymer under a multiaxial stress. The main material property requirements are tensile creep compliances over a suitable time range and at different stress levels. Some creep data under uniaxial compression are also required. Relationships are derived between stress and strain components for arbitrary stress or strain histories. An assumption is required that either the Poisson¿s ratio or the bulk modulus does not change significantly with time over the time scale of the predictions. The model has been coded into a finite element system to enable stress analyses to be carried out on objects of complex geometry. The validity of the model is explored through comparisons of predicted and measured results from a test that is designed to produce a predominantly pure shear stress state in the gauge region of the specimen. Results are presented for loading under constant stress and constant deformation rate.

Item Type:	Article
Keywords:	Non-linear viscoelasticity, creep modelling, finite element analysis
Subjects:	Advanced Materials Advanced Materials > Polymers
Identification number/DOI:	10.1002/pen.21993
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5304

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