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Journal Articles Composites Science and Technology Year : 2017

Hygroscopic expansion: A key point to describe natural fibre/polymer matrix interface bond strength

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Abstract

The present article aims to investigate the contribution of hygroscopic expansion of flax fibres to interfacial radial stresses and Interfacial Shear Strength (IFSS) of Maleic Anhydride grafted Polypropylene (MAPP)/Flax biocomposites. During manufacturing of thermoplastic biocomposites and storage at 50% RH, a weight variation is observed, attributed to water content evolution within plant cell-walls. The hygroscopic radial expansion coefficient beta r (flax) of single flax fibres estimated by Environmental Scanning Electron Microscopy (ESEM) observation is many orders of magnitude higher (beta(f,R) = 1.14 s/Delta m) than thermal expansion (alpha(f,R) = 78 10(-6) epsilon/degrees C). Thus, its contribution to the development of residual stresses sigma(rad) during processing should be prevalent. A multiscale analysis of interfacial stress state and hygroscopic contribution is performed with the use of a cylindrical concentric model at microscopic scale and asymmetric composite laminates [0, 90 degrees] curvature generation at macroscopic scale. Similar radial stresses are obtained, while relevant values of mu (IFSS/sigma(rad)) approximate to 0.46 are calculated. Therefore, the interfacial bond strength of natural fiber/polymer systems should be described by taking into account their hygroscopic behavior. (C) 2017 Elsevier Ltd. All rights reserved.

Dates and versions

hal-01689998 , version 1 (22-01-2018)

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Antoine Le Duigou, Justin Merotte, Alain Bourmaud, Peter Davies, Karim Belhouli, et al.. Hygroscopic expansion: A key point to describe natural fibre/polymer matrix interface bond strength. Composites Science and Technology, 2017, 151, pp.228-233. ⟨10.1016/j.compscitech.2017.08.028⟩. ⟨hal-01689998⟩
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