. . . . . . . . . .    ANM 2010     3rd International Conference on Advanced Nano Materials     12-15 September 2010 - Agadir, Morocco Back    Abstract ANMM349 NANOSILICA-FILLED POLY(METHYL METHACRYLATE): CHARACTERISATION AND MODELLING OF THE MECHANICAL BEHAVIOUR     J.L. Halary 1, M. Muriel 1, R. Matadi 2, N. Bahlouli 2, S. Ahzi 2,3 1 Laboratoire PPMD (UMR 7615), Ecole Supérieure de Physique et Chimie Industrielles de la Ville de Paris, 10 rue Vauquelin, 75231 Paris cedex 05, France 2 IMFS,  Université de Strasbourg, 2 rue Boussingault, 67000 Strasbourg, France 3 TEMA, University of Aveiro, 3810-193 Aveiro, Portugal . Mechanical tests of nanosilica-filled PMMA samples were used to characterize their thermomechanical properties and stress-strain response. A thermomechanical model based on an elastic–viscoplastic rheological approach, was developed to describe the mechanical response of these polymer nanocomposite materials over a wide range of temperatures and strain rates under uniaxial compression. Our model accounts for the effects of temperature, strain rate, hydrostatic pressure and nanosilica concentration. Intramolecular, as well as intermolecular, interactions under large elastic–inelastic behavior are considered for the mechanisms of deformation and hardening. The constitutive model shows very good agreement with the experimental data for various temperatures, strain rates, and nanosilica concentrations. . © nanoAC . . . . . . . . . .

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