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Elasto-viscoplastic constitutive equations for the description of glassy polymers behavior at constant strain rate

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2007
auteur(s) Zaïri Fahmi; Naït Abdelaziz Moussa; Woznica Krzysztof; Gloaguen Jean-Michel
journal (abréviation) Journal of Engineering Materials and Technology (J Eng Mater Tech)
volume (numéro) 129 (1)
pages 29 – 35
résumé In this study, a modelization of the viscoplastic behavior of amorphous polymers is proposed, from an approach originally developed for metal behavior at high temperature, in which state variable constitutive equations have been modified. A procedure for the identification of model parameters is developed through the use of experimental data from both uniaxial compressive tests extracted from the literature and uniaxial tensile tests performed in this study across a variety of strain rates. The numerical algorithm shows that the predictions of this model well describe qualitatively and quantitatively the intrinsic softening immediately after yielding and the subsequent progressive orientational hardening corresponding to the response of two polymers, amorphous polyethylene terephthalate and rubber toughened polymethyl methacrylate.
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