Abstract
To utilize the advantage of Charpy impact test, a study was made of the empirical correlation between crack arrest test, such as DWTT and temperature gradient ESSO test, and instrumented Charpy test by a modified notch specimen. Main results were as follows.
1) Fracture initiation resistance was reduced in the order of the V-notch, the fatigue-notch, the fatigue-notch after embrittlement by an electron beam welding and the V-notch after embrittlement by the welding (EBV-notch).
2) The lowest temperature where 100% shear fracture occurred in the EBV-notch Charpy test (EBVTrs=100) coincided with DWTT 85% SATT.
3) Kca value deduced from instrumented Charpy test by EBV-notch specimen almost coincided with Kca value obtained from temperature gradient ESSO test.
