Fracture Toughness Prediction in Probabilistic Statement Based on the New Local Fracture Criteria

摘要

The probabilistic model for fracture toughness prediction has been elaborated on the basis of the local criteria for cleavage and ductile fracture proposed by authors and the approximated solution for problem about stress-strain state near the crack tip. This probabilistic model allows one to predict the dependence K_(IC) on temperature for any given probability of brittle fracture; to describe the effect of the specimen thickness on K_(IC); to determine the scatter band for the brittle-to-ductile transition temperature. Comparison of experimental and calculated results has been performed as applied to 2.5 Cr-Mo-V nuclear pressure vessel steel.