埋込み光ファイバによるSiC繊維強化アルミニウム複合材料の損傷検出

抄録

This paper describes the monitoring method of reinforcement fiber fracture in a SiC fiber reinforced aluminum composite using optical fiber. The optical fiber embedded composites were produced by the interphase forming/bonding method with copper insert. During the tensile test of the composites, the optical transmission loss of the optical fiber was measured. The results show that breakage of the optical fiber starts at smaller strain than that of SiC fiber. Even after severe breakage of the optical fiber, it works as an optical path. Optical transmission loss is strongly dependent on the number of optical fiber breakage and also dependent on the gap ofbroken fiber. As breakage of SiC fiber strongly enhances that of optical fiber and is reflected on optical transmission loss, breakage of SiC fiber can be detected by monitoring of optical transmission loss. It can also reflect the type of fracture process of SiC fiber in the composite, that is, cumulative or concentrative.