Stiffness Behaviour Of Pineapple Leaf Fibre/Poly Lactic Acid Composites Under High Stress Fatigue Conditions

The tension-tension fatigue behaviour of polylactide based composites incorporated with 40 and 70 wt. % of pineapple leaf fibre at 0.75 ultimate strength has been investigated. The measure stress-strain data allowed to observe the evolution of the mechanical properties under high stress as the function of the imposed cycle. The dynamic modulus increase of 1-5 % for both composites with loading cycles confirming stiffening phenomenon occurred in the unidirectional pineapple fibres reinforcement orientated parallel to the loading direction.