溶接構造用鋼の曲げ試験における破壊挙動におよぼす衝撃速度の影響

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Mechanical properties and fracture toughness bending strength of weldable structural steel (SM41) have been studied with three point bending test over the wide range of nominal bending speed ranging from 6mm/min to 40m/sec and testing temperature, from -196 to 70℃. The results obtained were as follows. 1) Nominal skin stress of smooth specimen had been increased with lowering temperature and increase of bending rates. In static bending of fatigue-cracked and mechanically notched specimens, it showed no remarkable temperature and notch root radius dependency except at lower temperature, while in dynamic bending, it was observed strong temperature, notch root radius and bending speed dependencies. 2) Ratio of nominal skin stress of notched specimens to that of smooth ones was increased with notch root radius and showed no strong temperature dependency in static bending. In dynamic bending, the ratio was increased sharply with temperature and shifted to higher temperature with bending speeds. 3) The effect of notch root radius was not strong in fracture toughness. Plane strain fracture toughness was obtained at higher temperature in dynamic bending than in static one. 4) The relation between cross head displacement and clip gage one showed linear relationship for both experimental results and finite element method (FEM). 5) Critical COD in dynamic bending might be calculated from the relation between cross head displacement and clip gage one in static test, and the experimental equation about COD and displacement in dynamic test. 6) In critical COD, transition behavior was observed for temperature and it shifted to higher temperature with bending speeds.
独立行政法人海上技術安全研究所の論文
1976-03-20

溶接構造用鋼の曲げ試験における破壊挙動におよぼす衝撃速度の影響

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