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Estimation du comportement élastique transverse de composites unidirectionnels, application à l'étude du rôle des fluctuations morphologiques locales

Abstract : In order to combine performance, low weight and durability, unidirectional fiber reinforced composites are sometimes an efficient alternative to traditional metallic solutions. However, testing the efficiency of these composite materials in an industrial process can be time consuming and expensive. Estimating longitudinal effective properties, i.e. in the fiber direction, is quite simple by knowing the properties of the constituents and their volume respective volume fraction. This is not as simple for the transverse effective properties (transverse effective shear and bulk moduli in this study). Experimentally, it is quite difficult to obtain these moduli. Numerically, transverse properties are strongly influenced by the fibre arrangement. “Realistic” micromechanical modelling is though needed to understand the influence of the fiber packing on the mechanical properties. In this context, coupled numerical and analytical micromechanical modelling approaches are an efficient way to move forward. In this work, the transverse elastic behaviour of transversely isotropic multi-phased materials is studied. As an application example, the case of UD with “trapped” matrix regions is investigated. For this purpose, a “n-phase” Generalized Self-Consistent Scheme coupled with a Morphologically Representative Pattern approach have been developed. Analytical solutions, depending on two morphological parameters are provided to predict the transverse shear modulus and the transverse bulk modulus. Moreover, the proposed model, written in a transversely isotropic formalism, is valid for a wide range of inclusion volume fractions and specifically for the highest volume fractions we can find in high performance composites. A microstructural Finite Element Model is used to handle the complex morphologies, approaching as closely as possible real microstructures. Those numerical simulations help supplying the analytical implementation for a better description of interactions between the constituents and calibrate the two morphological parameters. This new model is compared with the models commonly used by the composite community to predict transverse properties.
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Submitted on : Wednesday, June 8, 2022 - 11:15:14 AM
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  • HAL Id : tel-03690439, version 1

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Jennifer Blondel. Estimation du comportement élastique transverse de composites unidirectionnels, application à l'étude du rôle des fluctuations morphologiques locales. Matériaux. Université Paris sciences et lettres, 2021. Français. ⟨NNT : 2021UPSLM059⟩. ⟨tel-03690439⟩

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