表面近傍の内部裂の欠陥評価法に関する検討

概要

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Facture toughness tests of embedded crack specimens produced by using the diffusion welding method were performed to investigate the method of assessment for embedded defects near surface. It was found that for l/r_6>0.5 (where l is ligament width and r_e the radius of reduced circular crack with an area equivalent to that of an elliptical crack), the K-value can be eatimated by supposing that a reduced circular crack is in the center of the specimen, and for l/l_e≦0.5, it can be evaluated by supposing that a semicircular surface crack with an area equivalent to that of an elliptical crack exists. The present method of assessment of defects needs to detect only the area and position of defects, while the standard codes published require theprecise shape and dimensions of defects. This suggests that a convenient method of assessment of embedded defects can be developed when incorporated with ultrasonic inspection which gives the area of crack easily.
社団法人日本材料学会の論文
1985-09-15