Caractérisation et Modélisation du comportement micromécanique des matériaux composites SMC sous chargement thermomécanique de type quasi-statique et fatigue.

Abstract : The composite materials are strongly conditioned by the ability of the company to design the automotive structures under various complexes loadings such as fatigue. The aim of this thesis is to develop a multi-scale modeling coupled to a phenomenological approach in order to provide a response to the dimensioning need of structural parts subjected to cyclic loading at different temperatures of 23°C, 80°C and -30°C. By this way, the work was conducted along two main lines; firstly, an experimental investigation under monotonic and fatigue loadings. The results of this experimental study provide the necessary data for the construction of a micromechanical model which constitute the basis of the second part of this work; the predictive approaches of the fatigue lifetime for SMC composite. Thus, two hybrid, phenomenological/micromechanical, modeling approaches have been proposed. Both are based on a micromechanical modeling that allows describing the mechanical behavior of our material under monotonic loading, taking into account the microstructure and the damage phenomenon. These two predictive models require only a limited number of experimental tests and investigations but remain very reliable in their capacity to predict the lifetime of an SMC composite material under fatigue loading. The approach is validated in the case of thermomechanical sequential loadings at variable temperatures or amplitudes.
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Mohamed Amine Laribi. Caractérisation et Modélisation du comportement micromécanique des matériaux composites SMC sous chargement thermomécanique de type quasi-statique et fatigue.. Mécanique des matériaux [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM; Ecole Nationale d'Ingénieurs de Sousse-ENISo (Tunisie), 2018. Français. ⟨NNT : 2018ENAM0062⟩. ⟨tel-02148477⟩

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