Thermoforming of a PMMA transparency near glass transition temperature

Authors

  • Pierre Gilormini,

    1. Laboratoire Procédés et Ingénierie en Mécanique et Matériaux, Arts et Métiers ParisTech, CNRS, 151 boulevard de l'Hôpital, 75013 Paris, France
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  • Luc Chevalier,

    1. Laboratoire Modélisation Simulation Multi Echelle, Université Paris-Est, CNRS, 5 boulevard Descartes, Champs-sur-Marne, 77 454 Marne-la-Vallée, France
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  • Gilles Régnier

    Corresponding author
    1. Laboratoire Procédés et Ingénierie en Mécanique et Matériaux, Arts et Métiers ParisTech, CNRS, 151 boulevard de l'Hôpital, 75013 Paris, France
    • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux, Arts et Métiers ParisTech, CNRS, 151 boulevard de l'Hôpital, 75013 Paris, France
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Abstract

To simulate the thermoforming of a transparency, constitutive equations are proposed for the nonlinear viscoelastic behavior of poly(methyl methacrylate) near glass transition temperature, which include large deformations. In a first step, they are fitted on a set of uniaxial tension-relaxation tests at various strain levels and strain rates. In a second step, their implementation in a finite element code is performed. Finally, the thermoforming of a transparency at a constant and uniform temperature is simulated and compared with experimental results. POLYM. ENG. SCI., 50:2004–2012, 2010. © 2010 Society of Plastics Engineers

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