Distribution of Fractare Toughness Measured in Weld Joint

摘要

A mew model on the distribution of measured fracture toughness values in weld joints was proposed, by taking account of the fractographic observation that cleavage cracks started from the crack tip were often arrested after a little extension in COD test of the weld joints. The model can explain the scatter of the measured fracture toughness and existence of crack initiation sites other than the local brittle zone, which were often observed for the weld joint CTOD test in the past literatures.