Effects of Water Ageing on the Mechanical Properties of Flax and Glass Fibre Composites: Degradation and Reversibility

Abstract : Mechanical properties of flax-fibre reinforced composites (FFRC) are strongly affected by water ageing compared to glass-fibre reinforced composites (GFRC). This study highlights the influence of water absorption during immersion at 30 °C on mechanical properties of unsaturated polyester reinforced composites . Flax-fibre composites showed a Fickian absorption behaviour and a water uptake 15 times higher than that of glass-fibre composites. GFRC’s tensile modulus and maximum stress were slightly affected by water uptake while FFRC’s tensile modulus decreased by 37 %, and ultimate stress increased by 34 %. A silane-based chemical treatment (1 % compared to flax fibres) was applied onto flax fibres. Water uptake was slightly reduced by 9 % while tensile modulus at saturation was enhanced by 22 % on treated FFRC compared to untreated ones. Moreover, the complete recovery of the tensile modulus after desiccation suggests that ageing was mainly reversible: fibre and matrix plasticizing phenomena occurred during immersion at 30 °C. No damage was noticed but composites’ initial properties changed with the action of water: further crosslinking of matrix and release of fibre’s small cell-walls components into water were observed. Finally, the drying conditions influenced the return to the initial state before ageing insofar the flax fibres partially lost their initial humidity.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01300570
Contributeur : Magalie Prudon <>
Soumis le : lundi 11 avril 2016 - 11:33:21
Dernière modification le : lundi 25 novembre 2019 - 14:42:06

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Guilherme Apolinario, Patrick Ienny, Stéphane Corn, Romain Léger, Anne Bergeret, et al.. Effects of Water Ageing on the Mechanical Properties of Flax and Glass Fibre Composites: Degradation and Reversibility. Raul Fangueiro, Sohel Rana Natural Fibres: Advances in Science and Technology Towards Industrial Applications. From Science to Market, 12, Springer Netherlands, pp.183-196, 2016, RILEM Bookseries, 978-94-017-7513-7. ⟨10.1007/978-94-017-7515-1_14⟩. ⟨hal-01300570⟩

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