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Analyse expérimentale et numérique multi-échelles des champs mécaniques dans un polymère semi-cristallin

Abstract : This work is devoted to the analysis of the mechanical behaviour of semi-crystalline polymers at two scales: the lamellar stack scale and the spherolitic scale. At the lamellar stack scale, full-field microstructure simulations are performed in the small strain range using the ABAQUS® software. The influence of parameters of the macroscopic response during long-term stress relaxation and cycling is analyzed: the choice of the viscoelastic behaviour of the amorphous phase on the one hand, and the effects of microstructure and induced heterogeneities on the other. The results obtained with a simplified microstructure highlight several microstructure effects. At the spherolitic scale, the digital image correlation technique (DIC) is developed inside the SEM to perform in-situ displacement field measurements. The strain fields obtained in uniaxial tension of two semi-crystalline polymers show the existence of an heterogeneous deformation related to the spherolitic microstructure. Deterministic and statistical methods of the literature are applied to the field measurements, in order to identify the domain size over which the average measured strain corresponds to the macroscopic strain. In the absence of any information on the size of the Representative Volume Element (RVE) for this kind of materials, such estimation constitutes a significant step. Finally, prospects are given for the modeling of the mechanical behaviour of this kind of materials with scale transition, through a combination of numerical and experimental tools.
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Submitted on : Monday, October 22, 2012 - 3:02:27 PM
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José Teixeira-Pinto. Analyse expérimentale et numérique multi-échelles des champs mécaniques dans un polymère semi-cristallin. Matériaux. Ecole Nationale de Mécanique et d'Aérotechnique - Poitiers, 2012. Français. ⟨NNT : 2012ESMA0011⟩. ⟨tel-00744206⟩

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