S0304-3-3 レーザーの反射光を用いた疲労による表面損傷の全視野評価([S0304-3]光学的手法)

概要

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The authors investigated a method to evaluate fatigue damage on the surface of mild steels without contact using laser. In the previous work, we used a laser spot beam illuminating the fatigue damaged point of a specimen surface and observed diffusion pattern change of the reflected light pattern due to surface change by slipband. In this paper, we tried to detect fatigue damaged area in the full field of the observing area with a CCD camera and evaluate fatigue damage using an optical setup with a laser slit beam. The results showed that full-field visualization and evaluation of fatigue damage is possible by scanning the slit beam on the specimen surface and superimposing the reflected pattern images for each slit beam. The authors also tried to find distribution of evaluated fatigue damage inside the fatigue area.
2010-09-04