Abstract
The methods of measurement of stretched zone width (SZW) have been examined and its relative insensitivity to thickness and length of pre-fatigue crack in CT specimens, encourages its use to mark the end of blunting in the J–R curve. On the basis of SZW, a mathematical equation has been determined for the slope of blunting line, also as a function of strain hardening coefficient, in the limited context of SA333 Gr. 6 steel and HSLA steel. The internal consistency of the 0.2 mm offset blunting line equation has been demonstrated by comparing the estimated and the observed initiation fracture toughness. The equation has been validated also with the results from literature. The initiation fracture toughness obtained for SA333 Gr. 6 steel following 0.2 mm offset line equation determined here compares well with the results reported in earlier investigations.
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