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In this work, the use of circumferentially cracked bar (CCB) sample to determine material fracture\udtoughness in the upper shelf regime for carbon steels has been investigated. Since high fracture toughness\udmaterials are known to exhibit extensive crack tip blunting before ductile crack initiation, accurate specimen\uddesign is required to provide realistic fracture toughness measurement. Here, a CCB was designed to have\udsimilar loss of constraint as for SENT sample. Continuum damage mechanics was used to predict the\udoccurrence of ductile crack initiation and propagation. Finite element analysis was performed to predict\udspecimen response and to compare computed J-integral crack driving force with measured CTOD. Finally,\udexperimental tests were performed on X65 carbon steel and the measured critical CTOD was compared with\udavailable fracture data obtained with SENT

Use of Circumferentially Cracked Bar sample for CTOD fracture toughness determination in the upper shelf regime