Investigation Of Fatigue Behaviour Of Pineapple Leaf Fiber Reinforced Polylactic Acid Composited

Norhaminudin, Nurul Shaqirah (2019) Investigation Of Fatigue Behaviour Of Pineapple Leaf Fiber Reinforced Polylactic Acid Composited. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Natural fibre reinforced polymer bio-composites constitute an important branch in the field of green composite materials. The fatigue life of pineapple leaf fibre(PALF) reinforcedpolylactic acid(PLA) composites is investigated.The objective of the study is to analysethe fatigue life of the PALF reinforced PLA composite at different fibreloadingand observe the secant modulus, energy dissipation and fatigue fracture surface by using scanning electron microscope (SEM). In this study, pineapple leaf fibre (PALF) is used as specimen whilePLAis use asthe matrix.The purpose of this study is to evaluate the fatigue properties of the PALF reinforced PLA in tension-tension condition.The specimens with different fibre loading which are 40wt% and 70wt% are cycles to tension-tension fatigue loading at stress ratio 0.1 with 2Hz of frequency to determine the fatigue life at given two stress levels; 50% and 75% of ultimate tensile strength and the curves of stiffness degradation has been plotted.At 50% UTS, the number of cycle for 40 wt.% and 70wt% PALF composite are 23966and 597532respectively. While higher stress level (75 %UTS), the number ofcyclefor 40 wt.% and 70 wt.% composite are5410and 5286 respectively.The fatigue strength of the composite is higher at higherfibrecontent indicating that fatigue life could be improved by using higher amount of reinforcement. The facture behaviour of the composite was matrix depended at low fibre content (40 wt.%) and fibre dependent at higher fibre content (70 wt.%). Morphology analysis showed fibre pull out and debonding occurred during the failure

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