Abstract
Non-contact method for fatigue damage evaluation was investigated. We detect fatigue damage and estimate fatigue life of steels with optical method by detecting surface change caused by fatigue. In fatigue of mild steels, fatigue damage occurs from material surface, slipbands appear and density of the slipbands increases with progress of fatigue damage. In this method, surface change due to slipbands is detected by change in light intensity distribution of diffusion pattern of the reflected laser light from the object surface. We are able to detect fatigue damage before crack initiation by observing diffusion pattern change. In this study, we investigated relation between change of diffusion pattern and number of loading cycles and we devised a method to estimate fatigue life of the object material. We also investigated a method of fatigue detection in the whole view field.
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