1022 レーザを用いた疲労損傷の全視野可視化および評価(S04-1 実験力学における計測・解析法の新展開(1)光学的手法,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

抄録

We investigated a method to evaluate fatigue damage of steels without contact using laser. The technique is based on observation of reflected light pattern by a laser light illuminated on the specimen surface. The reflected light pattern changes by diffusion on specimen surface due to slipbands by fatigue and we can evaluate fatigue damage observing diffusion pattern change. We previously used a spot beam and made an observation at a point. In this study, we tried to develop a method to evaluate fatigue damage in the whole view field with a CCD camera. We used an optical setup using a slit beam and whole field observation was made by scanning the slit beam. The results showed that there is a possibility of visualizing fatigue damage and detecting fatigue area in the whole field and also evaluating fatigue damage by the optical setup using slit beam.