Evaluation of Mode I Interlaminar Fracture Toughness for Carbon Fabric/Expocy Composite for Tilting Train Carbody

틸팅열차 차체용 탄소섬유직물/에폭시 복합재의 모우드 I 층간파괴인성 평가

  • 허광수 (금오공과대학교 기계공학부) ;
  • 김정석 (한국철도기술연구원) ;
  • 윤성호 (금오공과대학교 기계공학부)
  • Published : 2005.12.01

Abstract

Model I interlaminar fracture behaviors of the carbon/epoxy composite, one of the candidate composites for a tilting train carbody, were investigate by the use of DCB(Double cantilever beam) specimens. These specimens were made of CF3327 plain woven fabric with epoxy resin, and an artificial starter delamination was fabricated by inserting Teflon film with the thickness of $12.5{\mu}m$ of $25.0{\mu}m$ at the one end of the specimen. Mode I interlaminar fracture toughness was evaluated for the specimens with the different thickness of an inserter. Also delamination propagating behaviors and interlaminar fracture surface were examined through an ooptical travelling scope and a scanning electron microscope. We found that abruptly unstable crack propagation called as stick-slip phenomena was observed. In addition, interlaminar fracture behaviors were affected on the location and the morphology of a crack tip as well as an interface region.

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