K-0820 溶接構造用鋼SM490Aの靭性に及ぼす材料と切欠き底半径の影響(S11-5 構造健全性評価(5))(S11 構造健全性評価)

概要

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The brittle fracture was occurred in steel box columns of high-rise building in Hanshin-Awaji great earthquake. This study aims at developing the fracture toughness evaluation method useful for real-size components. Charpy impact tests and tensile tests with compact-tension type specimen were carried out for two heats of SM490A steel with high and low toughness values, ranging the radius curvature of notch from 0.1mm to 0.5mm. The relationship between Charpy impact values or J-integral and depth of ductile fracture region from notch root showed the unique curve, while the relationship between Charpy impact energy or J-integral and test temperature was dependent on the toughness of steels and the radius curvature of notch . This suggests that the depth of ductile fracture region is the important factor when the fracture toughness is evaluated for the real-size components.
2001-08-22