K-2327 予備亀裂入り光ファイバのマトリックス材料中破断によるセンサ形成とその評価(J03-5 ひずみ計測)(J03 知的材料・構造システム)

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This paper describes development of an optical loss type deformation sensor in matrix materials such as epoxy and aluminum by breaking a multiply pre-notched optical fiber embedded in them. The pre-notches were made on an optical fiber with an optical fiber cutter and the fiber was embedded in epoxy or aluminum matrix. The pre-notched optical fiber embedded material was tensile or bending tested under monitoring of optical transmission. The effect of spacing between pre-notches on probability of fracture at every pre-notch was examined. It was realized when the spacing was equal to or larger than 4mm. In order to decrease this critical spacing and increase number of fractures in the gauge length, bending was tried instead of tensile test. As the result, it was decreased down to 2mm. A similar result was obtained even in the case of aluminum matrix.
2001-08-22