8th International Conference on Mehanical and Physical Behaviour of Materials under Dynamic Loading
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 103-107
DOI: 10.1051/jp4:2006134017

Constitutive modeling of polymer materials at impact loading rates

J. Richeton¹, S. Ahzi¹, A. Makradi¹ and K.S. Vecchio<sup>2

1</sup>  Institut de Mécanique des Fluides et des Solides, UMR 7507, Université Louis Pasteur, 67000 Strasbourg, France
²  Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093, USA

(Published online 26 July 2006)

Abstract
Starting from physical basis, a robust three-dimensional constitutive model for the finite strain response of amorphous polymers is briefly presented. This model accounts for the high strain rate and temperature effect. Intramolecular as well as intermolecular interactions under large elastic-inelastic behavior are considered for the mechanisms of deformation and hardening. In particular, it is found that the secondary relaxations of polymer chains play an important role in the deformation process for the high strain rates and low temperatures. For a wide range of temperature and strain rate, the proposed constitutive model has been validated in compression for three amorphous polymers: polymethylmethacrylate (PMMA), polycarbonate (PC) and polyamideimide (PAI).

© EDP Sciences 2006

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