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Effect of moisture uptake on flax-reinforced composite laminates: influence on dynamic and quasi-static properties

Abstract : This study proposes to investigate the effect of moisture uptake on a wide spectrum of mechanical behaviours of unidirectional flax fibre-reinforced epoxy laminates. It includes tensile monotonic and fatigue testing. Results show that UD flax-epoxy composites, whenexposed to hygrothermal conditioning at 70°C and 85% RH, exhibit a diffusion kinetic which follows a one dimensional Fickian behaviour. The mass uptake at equilibrium is approximately 3.3 % and the diffusion coefficient 6.5 10-6 m2.s-1. Water vapour sorption is shown to induce a significant change in the shape of the tensile stress-strain curve. Contrary to all expectations, water saturation does not degrade the monotonic tensile strength of such a flax-epoxy composites and induces an increase in the fatigue strength for a high number of cycles
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https://hal.archives-ouvertes.fr/hal-02131249
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  • HAL Id : hal-02131249, version 1

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Michaël Berges, Romain Léger, Véronique Person, Vincent Placet, Emmanuel Ramasso, et al.. Effect of moisture uptake on flax-reinforced composite laminates: influence on dynamic and quasi-static properties. ECCM17 - European Conference on Composites Materials, Jun 2016, Munich, Germany. ⟨hal-02131249⟩

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