Investigation on the fatigue life characteristic of kenaf/glass woven-ply reinforced metal sandwich materials

Fatigue life characteristic of hybrid composite reinforced metal laminate is a notable investigation since this kind of material offers several superior characteristics over conventional metallic alloy. A majority of the researches have focused on the mechanical properties of hybrid composite and conventional fibre metal laminate such as glass reinforced aluminium epoxy and aramid fibre reinforced aluminium laminate. However, investigation on the fatigue life behaviour of hybrid composite reinforced metal laminate still remains unexplored. In this study, the fatigue life characteristic of hybrid kenaf/glass reinforced metal laminate with different fibre configurations, orientation and stress ratio was presented. Fibre metal laminate was manufactured through hot press moulding compression method using annealed aluminium 5052 as the skin layers and the composite laminate as the core constituent. Tensile test was conducted at a quasi-static rate in accordance with ASTM E8 while tension-tension fatigue test was conducted at force controlled constant amplitude according to ASTM E466. Experimental results revealed that fibre metal laminate with 0 degrees/90 degrees fibre orientation exhibited better tensile and fatigue properties compared to fibre metal laminate with +/- 45 degrees fibre orientation regardless of the woven-ply fibre configurations. Besides that, it was identified that higher stress ratio improves the fatigue life cycle of the fibre metal laminate structures.