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STUDYING THE EFFECT OF CHEMICAL TREATMENT AND ORIENTATION ON FRACTURE TOUGHNESS OF KENAF FIBRE EPOXY COMPOSITES

Author: Mushtaq Albdiry,
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2017 Volume: 10 Issue: 4 Pages: 505-515
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

In this paper, the effect of surface modification and fibre arrangements of kenaf fibers on fracture toughness of epoxy composite was investigated. The chemical treatment of kenaf fibers (KFs) with 6 % NaOH was achieved, and composites with two different fibre arrangements (X and Y) directions were fabricated. Values of fracture toughness (KIc) measured of the compact tension (CT) specimens for both untreated kenaf fibre-reinforced epoxy (ut-KFRE) composites and treated kenaf fibre-reinforced epoxy (treated-KFRE) were much better than the neat epoxy. The KIc value of the treated-KFRE composite in Y-fibre direction was the highest of 2.74 MPa.m1/2 while it was 1.45 MPa.m1/2 for the neat epoxy. Different toughening mechanisms were noticed in the fracture surfaces of the composites in relation to the fibre reinforcement planar, they are shear yielding and fibre splaying with the X-direction and broken fibers, fibre pullout and fibre delamination with the Y-fibre orientation.


Article
Influence of treated kenaf fibers on the mechanical behavior for thermoset - based Polymer composite

Author: Bushra H. Musa
Journal: Journal of College of Education مجلة كلية التربية ISSN: 18120380 Year: 2015 Issue: 3 Pages: 315-328
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

In this research, some mechanical properties such as (flexural strength, young modulus and wear rate) have been studied to the composite Epoxy resin (EP) reinforced with % 5 volume fraction of chopped kenaf fibers (KF) ) by using hand lay-up technique . The natural fibers treated with 0.5normality of NaOH solution. The experimental results were compared with treated fibers composite, un treated fiber composite and pure epoxy. It was found that the treated kenaf fibers have increasing in young modulus, flexural strength values of the (EP/ KF) composite, comparing with neat resin (EP), while wear rates were increased with applied load of all samples.

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