Comportement en fatigue avant et après impact de composites tissés chanvre/époxy

Abstract : This study focuses on a woven hemp/epoxy composite. Tests were first conducted on its components. They showed that the behaviour of resin impregnated yarn is more representative of the yarn behaviour in the composite than the dry yarn usually studied. These tests were also used to determine the material parameters necessary for the development of a finite element model of a composite ply. This model is based on a simplified representation of the fabric. Variability of properties of the components was taken into account. Strain fields were compared with those measured by the DIC technique on the surface of the composites. Fatigue tests were conducted on composites [0°/90°]7 and [±45°]7. Heating was measured by IR camera; the damage was followed by AE and high resolution camera. Observations were made by microscopy and X-ray microtomography. A detailed analysis of damage mechanisms was performed. A model of S-N fatigue curve was adapted to the studied hemp/epoxy composite. The resistance to impact and the post-impact mechanical behaviour of the [0°/90°]7 hemp/epoxy composite were studied. The results showed the influence of a non-destructive impact on the fatigue life of the composite, and the evolution of the damage was analyzed. It has been shown that the model of S-N fatigue curve can be applied to impacted specimens. It is thus possible to predict the fatigue life of the impacted composite from the tensile strength and fatigue behaviour of the non-impacted material.
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Davi Silva De Vasconcellos. Comportement en fatigue avant et après impact de composites tissés chanvre/époxy. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2013. Français. ⟨NNT : 2013ESMA0017⟩. ⟨tel-00933157⟩

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