Abstract
Critical CTOD is widely used as a fracture toughness parameter for structural steels. Critical CTOD often has a scatter of more than one order of magnitude. To explain this scatter, Beremin proposed a model called Weibull stress or Beremin model, but some researches cast doubts on the model. Some models were proposed so that they consider microcrack nucleation by taking plastic strain into account. However, these models cannot completely describe experiments, nor did they calculate the scatter of fracture initiation points. The aim of the present paper is to propose a new model which more precisely predict fracture toughnesses as well as fracture initiation points.
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