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Modélisation de la mise en forme des renforts fibreux cousus (NCF) : Etude expérimentale et numérique de l’influence de la couture

Abstract : Continuous fibre composites (carbon, glass) are regularly used in the transport industries (automotive, aeronautics) for their excellent mechanical performance in relation to their mass. While woven reinforcements are widely used and studied, there is a growing interest in stitched reinforcements called "non crimp fabric" (NCF). These reinforcements consist of juxtaposed plies of unidirectional fibres , non-woven, but sewn together with a stitching thread. They allow a greater variety of fibre orientation and optimize the properties of the composite by reducing fiber interweaving. The manufacture of composite parts by automated processes such as RTM (Resin Transfer Molding) involves the forming of fibrous reinforcements to obtain complex 3D geometries. The draping of NCFs is strongly impacted by the presence of the stiching thread. The development of simulation tools should enable the manufacture of these products to be optimize. This work focuses on the mechanical role of stitching during forming. The study focuses on experimental tests and finite element simulations in explicit dynamics of various NCF reinforcements. Different modelling approaches at macroscopic scale are proposed for NCFs, based on previous work on woven reinforcements : integration of stitched thread and the stitch pattern into the laws of behaviour; development of models mixing continuous finite elements for fibre modelisation, and semi-discrete models for the stitch. The performance of these different approaches is compared with experimental results. Finally, a new contribution is add to consider the bending rigidity in the plane of the fibrous reinforcements by generalizing the use of finite elements shell called "rotation-free" for the calculation of all the curvatures (out of plane and in the plane).
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Quentin Steer. Modélisation de la mise en forme des renforts fibreux cousus (NCF) : Etude expérimentale et numérique de l’influence de la couture. Matériaux. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSEI115⟩. ⟨tel-02935601⟩

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