Abstract
Modern structural integrity assessment relies upon fracture mechanics, thus utilizing fracture mechanical parameters describing the material fracture resistance against crack initiation and crack propagation as well as the material crack-arrest behaviour. However, crack-arrest fracture toughness values are usually difficult and expensive to determine. In this paper correlations are proposed for estimating the nil-ductility temperature (T NDT ) and the crack-arrest fracture toughness (K la ) from a transition temperature, based on instrumented Charpy-V crack-arrest load information. The transition criteria used are the 4 kN crack-arrest force and the mean crack-arrest fracture toughness of 100 MPa√m according to the master curve approach. Correlations between transition temperatures, T(F a = 4 kN), T(K la ), and T NDT , which were proposed for various structural steels, work very well for the 18Ch2MFA material.
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