走査電子顕微鏡による疲労き裂進展挙動の動的直接観察と画像処理技術の開発

概要

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The computer image processing system incorporated into the specially designed servo-hydraulic fatigue loading facilities operating in a scann using the image processing technique, and this processed ing electron microscope (SEM) has been developed. The image processing system developed is composed of a micro-computer (NEC PC9801,memory capacity is 4 Mbytes) and a high-speed direct mumory access type A/D converter (ELMEC EC-2390). The secondary electron signal of SEM was directly transferred to the memory of micro-computer through the converter at a digitizing rate of 5 to 50 μ sec per point. By using this system, the sampling of successive five flames of SEM image date during fatigue loading of 0.1 H_z become possible. Direct, real time observations of fatigue crack growth behavior under both constant amplitude and repeated two-step loadings were made. Both the crack profile and the contours of fine magnesium oxide particles, which were scattered on the specimen surface as location markers, were extraced from the original SEM image date by using the image processing technique, and this processed image data was used in quantitative analyses of crack opening displacement, dehavior near the crack tip and crack growth increment.
社団法人日本材料学会の論文
1990-11-15