Abstract
Statistical behavior of the cleavage fracture for several types of steels was experimentally and analytically investigated. Two types of low alloy steels with different grain size, a conventional mild steel and a simulated HAZ of steel welds were tested. The weakest link model was introduced to describe the scatter of the cleavage fracture stress and the fracture toughness. Based on the statistical local fracture criterion approach, a correlation between the cleavage fracture toughness in the transition temperature region and the cleavage fracture stress was investigated. Theoretical consideration on the correlation was done on the basis of FEM analysis for fracture toughness specimens. The experimental results showed a good agreement with the analytical prediction of the correlation. The validity of deterministic local fracture criterion in the previous work was also confirmed by the present statistical approach.
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