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Etude de l’influence des fluctuations morphologiques microscopiques sur le comportement élastique transverse de composites unidirectionnels

Abstract : This paper presents an enhanced micromechanical analytical model to predict the transverse elastic properties of unidirectionnal (UD) composite materials. Unlike the elastic longitudinal constants, the transverse effective properties does depend on the spatial fibre distribution. This model allows to take into account the effect of local morphological fluctuations, mainly induced by random fibre arrangements, on the effective transverse properties. For that purpose, a “n-phase” Generalized Self consistent Scheme (GSCS) has been extended by using a Morphologically Representative Pattern (MRP) approach. As an example, a two bi-phasic pattern-based model is combined with some recent data of the literature (ultrasonic methods) to explore the broad predictive ability of the model. A full range of fibre volume fractions with fibre packing effects can be covered by the proposed method. Analytical solutions based on two morphological parameters (to which is added the overall volume fraction of fibers) are provided to predict the transverse shear modulus and the transverse bulk modulus of any UD composite material. The two moduli are shown to be linked together. Very simple analytical calculations make possible parametric studies less expensive than numerical or experimental characterizations.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-02319182
Contributor : Sébastien Joannès <>
Submitted on : Thursday, October 17, 2019 - 5:12:03 PM
Last modification on : Wednesday, October 14, 2020 - 4:20:35 AM

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  • HAL Id : hal-02319182, version 1

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Jennifer Blondel, Sébastien Joannès, Eveline Hervé-Luanco. Etude de l’influence des fluctuations morphologiques microscopiques sur le comportement élastique transverse de composites unidirectionnels. JNC 21 - 21èmes Journées Nationales sur les Composites, Bordeaux INP, Jul 2019, Bordeaux, France. ⟨hal-02319182⟩

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