EFFECTS OF FIBER LENGTH ON TENSILE-STRENGTH OF CARBON GLASS-FIBER HYBRID COMPOSITES

The tensile strength of epoxy resin reinforced with random-planar orie ntation of short carbon and glass fibres increased as the length of th e reinforcing fibres increased, and the increase in tensile strength r emained almost unchanged after the fibre length reached a certain leve l. The tensile strength of composites at any fibre length could be est imated by taking the strain rate and temperature dependence of both th e yield shear strength at the fibre-matrix interphase and the mean cri tical fibre length into consideration. The tensile strength of the hyb rid composite could be estimated by the additive rule of hybrid mixtur es, using the. tensile strength of both composites.