Abstract
This paper investigates effects of moisture (30RH%, 65RH%, 80RH% and 100RH%) on the morphological, physical and mechanical properties of unidirectional bamboo fibers reinforced composites at different fibers loadings (20, 30 and 40 wt%). Moisture adsorption kinetic, dimensional stability, adsorption-desorption and mechanical behaviour are determined. The obtained results showed that moisture adsorption and swelling monotonously increase with respect of the fibers content and relative humidity. Composites with 30 wt% fibers fraction show better tensile strength at 80RH% and 100RH%. However, all composites exhibit low tensile strength at small relative humidity, due to the shrinkage of fibers that increases interfacial voids. SEM and OM analyses allow to investigate the fracture surface of the specimens. A finite element model of the hygro-mechanical behaviour is performed and compared to analytical micromechanical predictions and experimental data. Interestingly, not only a simple finite element model but the coupling between hygroscopic and mechanical behaviours is used to analyze the internal stresses induced by swelling.
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