画像処理によるクリープ疲労微小分布き裂の計測

概要

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This study was carried out in relation to application of statistics of extremes to the evaluation of remaining life of high temperature components. When applying statistics of extremes, it is necessary to measure lengths of a large number of short cracks. This is time-consuming and laborious, and hence some automization of measurement is desirable. In the present paper, image processing was applied to measurement of short crack lengths and its usefulness was investigated. For this purpose, creep-fatigue tests were carried out on SUS 316 L. Smooth specimens were subjected to slow-fast cyclic strain of a total strain range of 1 % at 650℃ in air with ε^^.=2×10^<-5>/s in tension and ε^^.=2×10^<-3>/s in compression. Taking replicas of the specimen surface, the images of the replicas were put into the image processing equipment through the CCD camera and the stereoscopic microscope. Using some new algorithms developed in this study as well as conventional algorithms, individual crack lengths were measured. The crack length measured by means of image processing was compared with that by the eye observation. It was found that the error of measurement of crack length by image processing was within ±10%. The distribution of the crack length was also studied. Furthermore, propagation and coallescence behaviors of cracks were investigated by means of image processing.
一般社団法人日本機械学会の論文
1991-05-25