Abstract
Carbon fibre-reinforced polymer (CFRP) composites are used in various engineering fields with their excellent mechanical properties and lightweight. However, thermoset epoxy composites with brittle epoxy resin system are leading low fracture toughness that caused deterioration during cyclic loading. In addition, the delamination occurred on the thermoset laminated composite material to impact. In this study, to improve these problems, thermoplastic resin added on the top and bottom of thermoset composites and to impregnate two resins that are not compatible on reinforcement, combined prepregs were manufactured for co-curing process. As a result, the formation of thermoplastic layers on the top and bottom of thermoset composites was not significantly affecting much of impact load. However, this improved greatly the energy absorption so that improved fracture toughness.
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