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Hygrothermal effect on moisture kinetics and mechanical properties of hemp/polypropylene composite: experimental and numerical studies

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Toubal, Lotfi et Cuillière, Jean-Christophe et Bensalem, Karim et Francois, Vincent et Gning, Papa-Birame (2016). Hygrothermal effect on moisture kinetics and mechanical properties of hemp/polypropylene composite: experimental and numerical studies. Polymer Composites, 37 (8). p. 2342-2352. ISSN 1548-0569 DOI 10.1002/pc.23414

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Résumé

The exposition of thermoplastic composites reinforced with natural fibers to moisture and heat is likely to lower their mechanical properties and restrain their use in the design of parts. The present work is focussed on investigating the effects of hygrothermal aging on the mechanical behaviour of injected polypropylene reinforced with short hemp fibers. Moreover, the kinetic of isothermal moisture absorption has been studied for four immersion temperatures. The experimental results show that the time taken to reach saturation decreases significantly with increase in immersion temperature. These tests also reveal that moisture absorption in this type of materials does not follow Fick's law. Thus, a new model is proposed to predict this behaviour by the use of a variable coefficient of diffusion. This model is implemented using both analytical and finite element analysis (FEA) approaches. The results obtained with this new model show a very good correlation between experimental, analytical, and FEA absorption curves.

Type de document: Article
Date de dépôt: 17 mai 2021 13:03
Dernière modification: 17 mai 2021 13:03
Version du document déposé: Post-print (version corrigée et acceptée)
URI: http://depot-e.uqtr.ca/id/eprint/9611

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