지능형 복합재 적층판 구조물에 삽입된 광섬유 센서의 정적 인장강도에 관한 연구

Abstract

Statistical analysis and experiment with test machine newly devised for the static strength of optical fiber embedded within composite laminates was performed. The static strength of optical fiber embedded within the composite laminate was measured by the use of intensity drop-off of laser signal transmitted through the optical fibers. The optical fiber embedded within composite laminate showed lower static strength compared to the strength of bare optical fiber due to the thermal degradation. However the strength of embedded optical fiber was higher than that of the bare optical fiber which was exposed to the same thermal cycle as that of curing of composite. The fracture of optical fiber embedded within the cross-ply laminate was caused by the transverse matrix crack, while the fracture of optical fiber within the unidirectional-ply laminate was caused by the internal defect of optical fiber itself.