Modeling of hydrothermal aging of short flax fiber reinforced composites |
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| Affiliation: | 1. LAUM – Laboratoire d’Acoustique de l’Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France;2. ESTACA’Lab – Pôle Mécanique des Matériaux Composites et Environnement, Parc Universitaire Laval-Changé, Rue Georges Charpak, BP-76121, 53061 Laval Cedex 9, France;3. LAMPA – Laboratoire Angevin de Mécanique Procédés et innovAtion, Arts et Métiers ParisTech Campus Angers 2, Boulevard du Ronceray, 49 035 Angers Cedex 01, France;1. C2MA, Ecole des mines d’Alès, F-30319 Alès, France;2. FEMTO-ST UMR6174, Univ. Bourgogne Franche-Comté, F-25000 Besançon, France;3. DRIVE EA1859, Univ. Bourgogne Franche-Comté, F-58000 Nevers, France;1. CRITT Matériaux Poitou-Charentes ZA Beligon, rue Maurice Mallet, 17300 Rochefort, France;2. LUNAM Université, Ecole Supérieure du Bois, rue Christian Pauc, 44000 Nantes, France |
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| Abstract: | As a contribution to the prediction of the evolutionary behavior of biocomposites in service conditions, this study focused on the simulation of the hydrothermal aging of short natural fiber reinforced composites made by extrusion/injection molding. We endeavored to model the reversible modifications of the behavior of PLA and PLA/flax composites when immersed in water at different temperatures (20, 35 and 50 °C). A numerical model accounting for the heterogeneous mechanisms involved during aging such as water diffusion and the resulting swelling and plasticizing of polymers was implemented. Simulated data proved to be in perfect accordance with experimental results as long as no irreversible mechanism was occurring. The deviations of the simulated data from experimental results were limited at 35 °C but significant at 50 °C. Finally, the influence of moisture on the local elastic modulus of flax fibers was inferred thanks to the Halpin-Kardos homogenization model. |
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| Keywords: | A Biocomposite B Elasticity C Finite element analysis (FEA) D Moisture |
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