４点曲げ疲労試験用自動き裂観察システムの開発

抄録

To substitute for a traditional replication technique, an in-situ fatigue crack observing system for 4-point bending fatigue has been newly developed. This system consists of (1) 4-point bending fatigue jig having reflector, (2) stroboscope synchronized with test frequency, (3) long working distant type microscope, (4) computer controlled XYZ automatic stages and (5) hi-definition digital video camera. For verifying performance of this observing system, fatigue tests were carried out by using several type of specimens. It is proved that this system can be detect a small fatigue crack and its propagation behavior.