Abstract
A two-parameter fracture criterion has been proposed to predict fracture conditions of notched components. This criterion includes the critical notch stress intensity factor Kρ,c, which represents fracture toughness of a material with a notch of radius ρ, and the second non-vanishing parameter from the Williams equation, A3 term. The effective A3 –term A3,efhas been estimated as the average value of the A3 term distribution in the region ahead of the notch tip at the effective distance Xef. These parameters were derived from the volumetric method of notch fracture mechanics. The master curve Kρ,c=f(A3,ef) has been established as a result of the notched specimen. It was shown that the notch fracture toughness is a linear decreasing function of the A3ef,c-stress. The use of the master curve to predict fracture conditions was demonstrated on gas pipes with the longitudinal surface notch.
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