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Ayob, Siti Norain
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document
FABRICATION OF FUNCTIONALLY GRADED NATURAL FIBRE/EPOXY CYLINDER USING CENTRIFUGAL CASTING METHOD
Abstract
In this study, functionally graded natural fiber/epoxy (FGNF/epoxy) hollow cylinders are fabricated using the centrifugal casting method. The natural fiber (NF) used is banana trunk. Due to difference in density of NF and epoxy causes the NF particles in the epoxy liquid moves to the outside radius of the mold during casting. As a result, the hollow cylinders of FGNF/epoxy with different natural fiber content along the cylinder thickness are produced. NF is mixed with epoxy at three different fiber compositions which is at 2.5, 5 and 7.5 mass %. As the reference, the epoxy cylinder without fiber was fabricated. Three different speed rotating mold, i.e. 1145, 1187 and 1240 rpm are studied. In order to characterize the FGNF/epoxy cylinders fabricated, the hardness, density and compression test are carried out. Moreover, the microstructures of the FGNF/epoxy cylinders fabricated are observed using optical microscope. From the results, it is found that the NF particles can be graded from inner to outer surface of the FGNF/epoxy cylinders by centrifugal casting. The graded distribution in the FGNF/epoxy cylinders is significantly affected by the mold rotation speed and NF composition. Based on the result, the higher value of hardness, density and strength along the cylinder are located from the outer surface reduce gradually to the inner surface. It is because the NF composition of the outer was higher than that at the inner surface. In conclusion, it appears that FGNF/epoxy with a gradient in NF composition is superior to the homogeneous composite.