セパレーションを発生する鋼板の破壊靱性とその評価

概要

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In a study the authors performed this time, low-temperature steel plate and 50kgf/mm^2-class high-tensile steel plate produced by TMCP (Thermo-Mechanical Control Process) with separation appearance were analyzed for strength characteristics and fracture toughness, to evaluate their engineering practicality. A summary of the results of the study follows. (1) The higher the maximum separation index SImax of the steel plate, the more excellent that plate is in brittle crack propagation-arrest characteristic. Also, the brittle crack propagation-arrest characteristic can be predicted from the V-notch Charpy transition temperature vTrs and the maximum separation index. (2) The higher the maximum separation index SImax of the steel plate, the lower the Z-directional fracture toughness gets in values, although the maximum separation index of, say, 0.5mm/mm^2 or less would pose no problem for practical purposes.
社団法人日本船舶海洋工学会の論文
1985-03-22