광섬유 센서를 삽입한 지능형 복합재 구조물의 피로특성

Abstract

To evaluate the effect of embedded optical fibers within the unidirectional and crossply specimens on the fatigue behavior of the laminates, fatigue tests were performed. The optical fibers embedded within the composite layer of the same direction have little influence on the fatigue life reduction, while the optical fibers embedded in the 90 direction to the adjacent ply cause the fatigue life reduction. For the unidirectional specimens, the splitting of laminates was initiated from the interracial cracking due to the weak interracial bonding strength between the optical fiber and matrix resin, and these effect on the fatigue life was not so significant. For the crossply specimens, the splitting of laminates was initiated from the stress concentration caused by embedded optical fibers and these effect of splitting in the crossply laminates on the fatigue life was relatively high compared to the unidirectional ply case.