탄소나노튜브 및 하이브리드 적층구조가 CFRP/GFRP 복합재의 층내 파괴인성에 미치는 영향에 관한 연구

Abstract

Fiber reinforced composite material has significant advantages such as Light-weightness, high strength & stiffness, thermal resistance and durability of abrasion. Therefore, it is widely used in the aerospace, vehicle, power and heavy industries. However, composite material is vulnerable to Internal Flaws like delamination or damages of the matrix. Lately Many researches were Proceeded related to Interlaminar that is the delamination between laminates by using standardized methods of research such as ASTM. Comparatively Intralaminar that is the fracture in the laminate has experimental difficulties though is has been discussed through a few researchers. Thus It was studied using only monofibre composite materials but various types of composite materials such as Hybrid composites and particulate composites materials. In this present work, 4 types of CFRP/GFRP hybrid composite materials that have different layer structures are studied to compare and analyze intralaminar fracture toughness of different structures under 4-pont bending test. Also characteristics of the crack propagation behaviour is examined using microscopes after fracture test. And 4-pont bending test using CNT reinforced composite materials is conducted to figure out the effect of the CNT addition at the intralaminar fracture. The obtained results can be useful information to evaluate the intralaminar fracture toughness of the hybrid and CNT composite materials.