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Influence of the plastic potential on the mechanical response of thermoplastic components


A new developed hyperelastic-viscoplastic constitutive model for thermoplastic materials was recently proposed [1]. The model involves the mechanical response due to intermolecular resistance, and an entropic hyperelastic response due to re-orientation of molecular chains. A Neo-Hookean material model is selected for describing large elastic deformations. Moreover, the Raghava plastic yield surface is introduced to capture the pressure sensitivity behaviour, and a non-associative visco-plastic flow potential is assumed for volumetric plastic strain control. The strain-rate effects are formulated in a format well-suited for structural applications. The model is developed within a framework developed for finite elastic and plastic strains, using a multiplicative decomposition of the deformation gradient.
One of the improvements proposed in the conclusions of the original paper [1] addressed the use of more complex flow potentials but with the cost of adding additional parameters.
In this work three different flow potentials (e.g. linear, parabolic and elliptic) are implemented and the numerical response of a centrally loaded plate on a PP material is studied. The final objective is to analyse the influence of the different flow potential in a large-scale finite element analysis of polymeric structural components under impact loading conditions.


Academic lecture





  • SINTEF Industry / Materials and Nanotechnology

Presented at

Computational Plasticity XI, Fundamentals and Applications




07.09.2011 - 09.09.2011


International Center for Numerical Methods in Engineering



External resources

View this publication at Cristin