Abstract
Abstract: This experimental study highlights the effect of the geometric form factor (λ=length/diameter) and the fiber mass fraction on the mechanical behavior of an Alfa/Greenpoxy bio-composite. The Alfa stalks, collected in the Djelfa region in the Algeria highlands, were cut into pieces with length of 7 to 10 cm, washed and dried for two days at 70 °C. Using a knife mill coupled to three sieves (1.6, 2 or 2.5 mm), three categories of short fibers, according to their form factor λ, were obtained. Depending on the incorporated mass fraction (5, 10, 15 or 20 %) and the three form factors λ of the fibers, twelve types of plates were manufactured by hand molding followed by a curing cycle to accelerate the polymerization, reduce porosity and improve the final surface state. The main mechanical characteristics were determined with tensile, bending and shock tests on ISO 3167-type A samples, obtained by laser cutting. The results revealed that the increase of the form factor and the mass fraction gives rise to a significant improvement of the mechanical properties. We conclude that optimal processing conditions will maximize the mechanical properties of Alfa/Greenpoxy bio-composites. RESUME : Cette etude experimentale met en valeur l’effet du facteur de forme geometrique (λ=longueur/diametre) et de la fraction massique de fibre sur le comportement mecanique d’un bio-composite Alfa/Greenpoxy. Les tiges d’Alfa, collectees dans la region de Djelfa des hauts plateaux de l’Algerie, sont decoupees en morceaux de 7 a 10 cm, lavees et sechees durant deux jours a 70 °C. Trois categories de fibres courtes, suivant leur facteur de forme λ, ont ete obtenues par passage dans un broyeur a couteaux suivi d'un tamisage (tamis 1,6, 2 ou 2,5 mm). En fonction de la fraction massique incorporee (5, 10, 15 ou 20 %) et des trois facteurs de forme λ des fibres, douze types de plaques ont ete elabores par moulage manuel suivi d’un cycle de cuisson pour accelerer la polymerisation, reduire la porosite et ameliorer l’etat de surface final. Des echantillons ISO 3167-type A, preleves par decoupe laser, ont ete testes en traction, flexion et choc pour determiner les principales caracteristiques mecaniques. Les resultats ont revele que l’augmentation du facteur de forme et de la fraction massique engendre une sensible amelioration des proprietes mecaniques. Nous concluons que l’adoption de conditions optimales permettra de maximiser les proprietes mecaniques des bio-composites Alfa/Greenpoxy.
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