This paper describes a new procedure to calibrate the Weibull stress modulus, m, which employs SSY values for cleavage fracture toughness measured in the DBT region. The calibration scheme utilizes only one set of fracture toughness data while, at the same time, avoiding the non-uniqueness of calibrated Weibull stress parameters. An application follows to predict cleavage fracture behavior in different fracture specimens for an A515-70 structural steel tested in the transition region. The methodology predicts the measured statistical distribution of cleavage fracture toughness for the cracked specimens which provides a compelling support to the new calibration procedure.
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