|Author(s)||Le Duigou Antoine1, Merotte Justin1, 3, Bourmaud Alain1, Davies Peter2, Belhouli Karim3, Baley Christophe1|
|Affiliation(s)||1 : Univ Bretagne Sud, Polymer & Composites, FRE CNRS 3744, IRDL, Lorient, France.
2 : Ctr Bretagne, IFREMER, Marine Struct Grp, BP 70, F-29280 Plouzane, France.
3 : EcoTechnilin SAS, F-76190 Valliquerville, France.
|Source||Composites Science And Technology (0266-3538) (Elsevier Sci Ltd), 2017-10 , Vol. 151 , P. 228-233|
|WOS© Times Cited||28|
|Keyword(s)||Flax fibres, Fibre/matrix bond|
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 βr flax of single flax fibres estimated by Environmental Scanning Electron Microscopy (ESEM) observation is many orders of magnitude higher (βf,R = 1.14 ε/Δm) than thermal expansion (αf, R = 78 10−6 ε/°C). Thus, its contribution to the development of residual stresses σrad 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°] curvature generation at macroscopic scale. Similar radial stresses are obtained, while relevant values of μ (IFSS/σrad) ≈ 0.46 are calculated. Therefore, the interfacial bond strength of natural fiber/polymer systems should be described by taking into account their hygroscopic behavior.
Le Duigou Antoine, Merotte Justin, Bourmaud Alain, Davies Peter, Belhouli Karim, Baley Christophe (2017). Hygroscopic expansion: A key point to describe natural fibre/polymer matrix interface bond strength. Composites Science And Technology, 151, 228-233. Publisher's official version : https://doi.org/10.1016/j.compscitech.2017.08.028 , Open Access version : https://archimer.ifremer.fr/doc/00397/50830/