原子炉圧力容器用 A533B 鋼の計装化衝撃試験からえられる破壊特性に関する情報

概要

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Analyses of the date obtained from the instrumented impact test and of its correlation with static and dynamic J integral values and various tensile properties are made in this study. It is shown that a dynamic bending yield load recorded in the instrumented Charpy V test can be easily converted to a dynamic tensile yield stress using Server's equation. It is also possible to estimate a true fracture strain, COD value, and SZW easily if the load point displacement is recorded. Temperature dependency of Charpy V energy and J integral values is rather well simulated by a curve fitting method. However, a half value transition temperture obtained in that method has no physical meaning. Dynamic J_<Id> is larger than a static J_<Ic> in the ductile fracture range in this study. This rise is proportional to the yield stress ratio σ_<yd>/σ_y(∿1.2-1.3). It is found, therefore, that the following relation exists in the both cases ; J_I/σ_y=1.6COD. Correlation between the fracture toughness and tensile properties proposed by Hahn and Rosenfield shows a good result, but ROLFE-NOVAK'S equation on the impact value gives a poor one.
社団法人日本鉄鋼協会の論文
1983-07-01