Stacking Sequence Effect of Aramid-UHMPE Hybrid Composites by Flexural Test Method

Abstract

Aramid Fibre-ultra-high modulus polyethylene(UHMPE) fibre inter;ly hybrid composites were fabricated with changes in the stacking sequence. The flexural strength and modulus of hybrid composites were measured in order to investigate the effect of stacking sequence. Scanning electron microscopy (SEM) was used to examine the fracture surface of interply hybrid composites. When aramid fibre was at the compressive side and dispersion extent of fibers was small, the figher flexural strength and positive hybrid effect were observed. In addition, the different stacking sequence resulted in a change in flexural failure mechanism which had an effect on the flexural strength. As the dispersion extent of fibers decreased, the introduction of cohesive failure in aramid-aramid interface and PE-PE interface improved the flexural strength of hybrid composites.