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Caractérisation expérimentale et numérique du comportement mécanique des agro-composites renforcés par des fibres de chanvre

Abstract : In this thesis, fibres extracted from hemp plant and bio-composites polypropylene reinforced by short hemp fibres was investigated. Experimental studies coupled to numerical modelling have enabled to understand and determined their mechanical behaviour taking into account the geometrical shape, the natural defects and the size of hemp fibres. Microscopic experimental method has enabled to characterize the unitary fibre behaviour independently of fibre bundles. Due to their vegetal origins, hemp unitary fibres and bundles present a complex morphology and structure which have an impact on the mechanical properties of composite. Studies carried out the effect of the growing conditions and hemp variety on the fibre behaviour.For the bio-composite material, optical and macroscopic experimental characterization methods were used in order to determine the behaviour of a polypropylene PP reinforced by hemp fibres. The imaging correlation method is also used to analyse the local behaviour showing the heterogeneity of PP/hemp fibres reinforced material. Moreover, complementary work showed the impact of the fibre distribution and the manufacturing process on the composite properties and the damage initiation and growth
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Submitted on : Tuesday, October 13, 2020 - 2:48:08 PM
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Florent Ilczyszyn. Caractérisation expérimentale et numérique du comportement mécanique des agro-composites renforcés par des fibres de chanvre. Matériaux et structures en mécanique [physics.class-ph]. Université de Technologie de Troyes, 2013. Français. ⟨NNT : 2013TROY0016⟩. ⟨tel-02965743⟩

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