Effect of matrix on fatigue strength of carbon fiber composite materials

J. Ocean Eng. Technol. 1992;6(1):113-121.

탄소섬유강화 복합재료의 피로강도에 미치는 모재의 영향

유승원

대림전문대학 공업재료과

Keywords: CF/PEEK(Carbon Fiber/Polyetheretherketone), CF/EPOXY(Carbon Fiber/EPOXY), Fiber Breakage, Matrix carcking, Delamonation, Specific Modulus

핵심용어: 탄소섬유와 PEEK가 혼합된 복합재료, 탄소섬유와 EPOXY가 혼합된 복합재료, 섬유파손, 모재 균열, 층간 분리 비강성

Abstract

In this study, the variation of fatigue strength in CF/PEEK and CF/EPOXY, the matrix and interfacial strength of which differ from each other, has been studied from the viewpoint of microfracture behavior. The results obtained are as follows; According as the fatigue strength moves from the lower cycle range to the higher cycle range, that of CF/PEEK shows higher curve than that of CF/EPOXY does. In the early stage of fatigue life, the characteristic of fatigue crack in CF/PEEK is mainly the fracture of longitudinal fiber, while that in CF/EPOXY is the fracture of transverse fiber. The difference of fatigue strength in these materials can be explained by the fracture criteria of transverse fiber and longitudinal fiber.