Modélisation micromécanique et caractérisation expérimentale du comportement des matériaux hétérogènes élastoviscoplastiques : application à la valorisation des polymères recyclés

Abstract : This work relates to the modelling of mechanical behavior of elastoviscoplastic heterogeneous composites with the aim of an application to recycled polymers. Therefore, our study investigates the effect of the presence of impurities or strengthening agents on the mechanical behaviour of widely distributed thermoplastic polymers. In this way, a model based on a micromechanical approach is carried out on such materials. However, the complexity of elastoviscoplastic behaviour, that involves the hereditary type of material and induces a space/time coupling, is due to the presence of delayed mechanical interactions that scale transition should try to take into account. Considering the complexity of numerical implementation in hereditary approaches, internal variables approaches are privileged for their numerical simplicity. Within this framework, this development is intended to provide a general approach to the problem of scale transition. It relies on a new integral formulation of Eshelby inclusion problem. Then homogenization stage is carried out according to two methods : Mori-Tanaka estimate and self-consistent scheme. The results are presented and compared with those of other models and experimental results. The application to the case of linear viscoelasticity, the model used in this study led to the exact solution referring to Rougier hereditary model (Laplace-Carson Transform). In the non linear viscoelastic area, and with the aim of an application for recycling, a series of trials was conducted on polypropylene charged with talc.
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Mamadou Coulibaly. Modélisation micromécanique et caractérisation expérimentale du comportement des matériaux hétérogènes élastoviscoplastiques : application à la valorisation des polymères recyclés. Autre. Université Paul Verlaine - Metz, 2008. Français. ⟨NNT : 2008METZ033S⟩. ⟨tel-01752600⟩

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