2232 レーザのスリット光を用いた疲労損傷の可視化と評価(S15-2 実験力学と材料評価(2),S15 実験力学と材料評価)

概要

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We investigated a method to evaluate fatigue damage of steels in the whole view field without contact using laser. In fatigue of mild steels, slipbands are produced on a metal surface and the slipband density increases with progress of fatigue damage. Diffusion pattern of the reflected laser light illuminated on the specimen surface changes due to fatigue and we are able to detect fatigue damage based on diffusion change pattern caused by slipbands. We tried three types of optical setups to detect fatigue damaged area in the whole view field of the observing area with a CCD camera and also evaluate fatigue damage. Observations were made by fatigue loading under constant stress amplitude. The results showed that there is a possibility of detecting fatigue damaged area and evaluating fatigue damage by the optical setup using slit beam of laser light.
社団法人日本機械学会の論文
2007-09-07