レーザーを用いた疲労損傷の全視野可視化と評価

概要

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We have investigated a method to evaluate fatigue damage of mild steels without contact using laser. In high cycle fatigue of mild steels, we used a laser spot beam illuminating the fatigue damaged point of a specimen surface and observed diffusion pattern change of the reflected light from the specimen surface due to surface change by slipband in the previous work. This method was a point method observing at a point where spot beam is illuminating. 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 there is a possibility of detecting fatigue damaged area and also evaluating fatigue damage by this optical setup. Full-field visualization and evaluation of fatigue damage is possible by scanning the slit beam on the specimen surface and observing reflected light pattern of the slit beam. There is also a possibility to predict a position where final fracture occurs based on the distribution of evaluated fatigue damage inside the fatigue area.
日本実験力学会の論文