A Study on the Effect of Fiber Orientation on the Interlaminar Fracture Toughness

J. Ocean Eng. Technol. 1995;9(2):89-97.

Lee Jung-Kyu,Um Yoon-Sung,Kim Hyung-Jin,Koh Sung-Wi

층간파괴인성치에 대한 섬유방향의 영향에 관한 연구

이정규,엄윤성,김형진,고성위

부산수산대학교 산업대학원,부산수산대학교 대학원,경상대학교 기관공학과,부산수산대학교 기관공학과

Keywords: Interlaminar Fracture Toughness, Fracture Mechanisms, Fiber Orientation, Critical Energy Release Rate, Cross-Ply Laminate

핵심용어: 층간 파괴인성치, 파괴기구, 섬유방향, 임계 에너지 방출률, 사교적층판

Abstract

The investigate the effect of fiber orientation on the interlaminar fracture toughness of carbon fiber reinforced plastics three prepregs which are domestic products are used in this paper. Those are used for the unidirectional composites, but only one is used for the cross-ply laminate composites which is molded $[0/90]_{6s},;[0/45]_{6s},;and;[0/45/90]_{4s}$. The specimens used for the mode I and mode II Tests are DCB and ENF samples are examined by scanning electron microscope(SEM). The value of $G_{IC}$ is almost same when modified three calculating methods are applied. The highest value of $G_{IC}$at crack initiation is obtained at the $[0/90]_{6s}$ interlaminar and the lowest one is at the $[0/45/90]_{4s}$ interlaminar. The highest value of $G_{IIC}$ at crack initiation, however, is obtained at the $[0/90]_{6s}$ interlaminar and the lowest one is at the $[0/45]_{6s}$. The photographs of SEM show a difference behaviour between mode I and mode II fracture surface.