Mechanical Characterization of Stacked Roselle Fibre Composites: Effect of Fibre Orientation
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Abstract
The effect of fibre orientation on the tensile and dynamic mechanical performance of stacked Roselle fibre epoxy composites has been investigated. The hand layup method is employed to produce 0/90, 0/45 and ± 45 oriented Roselle fibre epoxy composites. The tensile test and dynamic mechanical analysis (DMA) were conducted as per ASTM standards. Results revealed that the tensile strength of 0/45 oriented Roselle fibre composite is 341% more than neat epoxy, 44% higher than 0/90 oriented composite and 106% greater than ± 45 oriented composite. As compared to pure resin, composites possess enhanced storage modulus. The composite with 0/45 orientation has higher storage modulus value than other composites. All Roselle fibre composites have up to 15% reduced glass transition temperature as compared to neat epoxy. SEM images cover the fibre pull-out and the presence of micro-voids in the epoxy matrix.
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