Fracture Characteristics Obtained from the Instrumented Impact Test of A533B Steel for Reactor Pressure Vessel

Abstract

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 ratioσ _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.