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Theses

Simulation macro-méso de la mise en forme de renforts tissés interlocks

Abstract : The forming stage in the RTM process is crucial because it strongly influences the mechanical behavior of composites in service. In order to better predict the appearance of possible defects of composite materials, numerical simulations are increasingly developed taking into account the duration and the cost of experiences. Deformations and orientations of yarns at the mesoscopic scale are essential to simulate the resin flow in the stage of injection. Given the number of elements and their complex interactions, it is difficult to conduct the shaping simulations for the entire reinforcement at this mesoscopic scale. This present thesis consists in developing a multiscale method that allows linking the macroscopic simulations of reinforcements and the mesoscopic modellings of RVE (representative volume element) during the forming process. Firstly, the numerical simulations for three different woven reinforcements at the macroscopic scale are carried out using an anisotropic hyperelastic constitutive law, by the finite element method with a dynamic explicit scheme. Then, the geometrical modelling of RVE at the mesoscopic scale are reconstituted based on the tomographic images. The mesoscopic displacement-deformation fields of woven reinforcements are determined from the macroscopic results and the position of the yarns. In order to take into consideration sliding effects of yarns, two approaches of mesoscopic simulations of RVE are developed. Finally, the mesoscopic numerical results are compared with the experimental results.
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Submitted on : Tuesday, May 12, 2020 - 11:24:10 AM
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  • HAL Id : tel-02570641, version 1

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Jie Wang. Simulation macro-méso de la mise en forme de renforts tissés interlocks. Matériaux. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSEI075⟩. ⟨tel-02570641⟩

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