The circumferentially cracked bar (CCB) specimen can be used to measure fracture toughness of ferritic steels when the compact-tension and single edge-cracked bend specimens are inappropriate. This paper reviews the fracture toughness data available in the literature with a view to providing advice for incorporating the CCB specimen in testing procedures. The analytical relationships used to derive the stress intensity factor, limit load and J-integral for the CCB specimen are also reviewed. The relationships are compared with finite element analyses to assess their accuracy and limits of applicability. Practical experience is assessed and recommendations are given to enable the fracture toughness of a material to be measured using CCB specimens.
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