Dean, G; Read, B; Wright, L (2002) A comparison of the data requirements and predictive accuracy of the cavitation model and a simple model for non-linear behaviour in finite element systems. NPL Report. MATC(A)120

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Abstract

Two elastic-plastic models are considered here for describing the non-linear deformation of tough plastics at large strains. These models can be used to predict the impact performance of a component up to failure. One is a relatively simple method that is commonly implemented in commercial finite element systems. The limitations of this model for use with certain types of plastics are illustrated with results for an ABS and a propylene-ethlene copolymer. The limitations arise with materials that undergo stress whitening through cavitation under tensile stress states. The second model has been developed to describe the influence of cavitation on deformation behaviour. Two formulations of this model have been developed and are needed to model the behaviour of two types of cavitating material, rubber-toughened plastics and semi-crystalline polymers with a rubbery amorphous phase.
The determination of parameters for each model is described and their predictive accuracies are compared with experimental data from uniaxial tension, uniaxial compression and constrained tension tests.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MATC(A)120
Subjects:	Advanced Materials Advanced Materials > Materials Modelling
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/2466

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