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Modélisation et simulation numérique à l’échelle des fibres du comportement dynamique d’un multifilament unidirectionnel en placement de fibres robotisé

Abstract : The mechanical behavior of the carbon tow in lateral pressure characterized by the relative movement between fibers giving it a non-linear behavior because of the contact inter-fibers. The fact that the fibrous structure of the tow makes it difficult to characterize its mechanical behavior during the automated placement. The complexity of the mechanical modeling of this fibrous media at fiber scale is due to the fact that the mechanical non-linearity depends in large part to the geometric configuration of fibers, the friction between fibers and also the dynamic environment of the placement. The mechanical modeling complexity is a consequence of the tight coupling between loading and deformation directions modifying the microstructure. This thesis is in keeping with the parameter optimization of the Automated Dry Fiber Placement process with a laser heat source. In order to improve understanding the thermos-mechanical behavior of tow during placement, a dynamic model has been developed to simulate the interaction between fibers. The aim is to be able to predict the geometric configuration of fibers under loading, as well as the position of the contact points. These works are the first step to achieving the objective of identifying and optimizing process parameters in order to increase the lay down speed as well as the quality of the preform.
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Khalid El Azzouzi. Modélisation et simulation numérique à l’échelle des fibres du comportement dynamique d’un multifilament unidirectionnel en placement de fibres robotisé. Génie mécanique [physics.class-ph]. École centrale de Nantes, 2016. Français. ⟨NNT : 2016ECDN0027⟩. ⟨tel-02990945⟩

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