Constraint assessment of brittle fracture of steel components, ISO 27306 vs. FITNET FFS

Abstract

ISO 27306 and FITNET FFS have been developed recently for correction of constraint loss in structural components. Both methods employ the Weibull stress as a driving force of brittle fracture. Nevertheless, the dissimilarity is found between the two methods. This paper compares ISO 27306 with FITNET FFS in terms of the constraint correction ratio provided by these methodologies. Discussion is conducted on 2-dimensional (FITNET) vs. 3-dimensional (IST) approach and input material parameters. Case studies are shown on the fracture assessment of tension wide plates within the context of the failure assessment diagram (FAD).