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틸팅열차 차체8 탄소섬유직물/에폭시 복합재의 모우드 II 층간파괴인성 평가
윤성모,이은동,허광수,정종절,신광복,Yoon Sung-Ho,Lee Eun-Dong,Heo Kwang-Soo,Jung Jeong-Cheol,Shin Kwang-Bok 한국철도학회 2005 한국철도학회논문집 Vol.8 No.2
Mode II interlaminar fracture behaviors of carbon fabric/epoxy composites, which are applicable to tilting train carbodies, was investigated by the ENF (End notched flexure) test. The 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$mu$m or 25.0$mu$m. The equation for mode II interlaminar fracture toughness was suggested based on the effective crack length from the compliance of load-displacement curve. Mode II interlaminar fracture toughness was evaluated for several types of the specimens. Also crack propagating behaviors and fracture surfaces were examined through an optical travelling scope and a scanning electron microscope.