FN Archimer Export Format PT J TI Hygroscopic expansion: A key point to describe natural fibre/polymer matrix interface bond strength BT AF LE DUIGOU, Antoine MEROTTE, Justin BOURMAUD, Alain DAVIES, Peter BELHOULI, Karim BALEY, Christophe AS 1:1;2:1,3;3:1;4:2;5:3;6:1; FF 1:;2:;3:;4:PDG-REM-RDT-LCSM;5:;6:; C1 Univ Bretagne Sud, Polymer & Composites, FRE CNRS 3744, IRDL, Lorient, France. Ctr Bretagne, IFREMER, Marine Struct Grp, BP 70, F-29280 Plouzane, France. EcoTechnilin SAS, F-76190 Valliquerville, France. C2 UBS, FRANCE IFREMER, FRANCE ECOTECHNILIN SAS, FRANCE SI BREST SE PDG-REM-RDT-LCSM IN WOS Ifremer jusqu'en 2018 copubli-france copubli-univ-france IF 5.16 TC 60 UR https://archimer.ifremer.fr/doc/00397/50830/51594.pdf LA English DT Article DE ;Flax fibres;Fibre/matrix bond AB 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. PY 2017 PD OCT SO Composites Science And Technology SN 0266-3538 PU Elsevier Sci Ltd VL 151 UT 000413796100028 BP 228 EP 233 DI 10.1016/j.compscitech.2017.08.028 ID 50830 ER EF