Evaluation of Mixed-mode Interlaminar Fracture Toughness of Carbon Fabric/Epoxy Composites for Tilting Train Carbody

틸팅차량용 탄소섬유직물/에폭시 복합재의 혼합모우드 층간파괴인성 평가

Mixed-mode interlaminar fracture toughness of carbon fabric/epoxy composites, which are applicable to tilting train carbody, was evaluated through the MMB (Mixed-mode bending) test. Specimens were made of CF3327 plain woven fabric with epoxy and a starter delamination at one end was made by inserting Teflon film with the thickness of 12.5 μ m. Mixed-mode interlaminar fracture test was conducted for 6 types of specimens with the mode II ratio of 20 ,35, 50, 65, 80, 90%. Also crack propagating behaviors and fractured surfaces were examined through an optical travelling scope and a scanning electron microscope, respectively.