Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5022301 | Composites Science and Technology | 2017 | 22 Pages |
Abstract
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/Îm) than thermal expansion (αf, R = 78 10â6 ε/°C). Thus, its contribution to the development of residual stresses Ïrad 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/Ïrad) â 0.46 are calculated. Therefore, the interfacial bond strength of natural fiber/polymer systems should be described by taking into account their hygroscopic behavior.
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Authors
Antoine le Duigou, Justin Merotte, Alain Bourmaud, Peter Davies, Karim Belhouli, Christophe Baley,