Abstract
This chapter discusses the K-crack opening displacement (K-COD) relationship for pin loaded single-edge notched tension specimens. In steels, it is possible that low triaxiality induces fibrous fracture (a tough fracture and consequently a higher 6C), while high triaxiality induces cleavage. Triaxiality is a function of specimen dimensions and it is expected that the state of stress at the crack tip will depend on the extent of deformation at the tip and its proximity to unnotched free edge. Thus, the state of stress at the crack tip will continuously change from plane strain to plane stress as loading progresses and the crack tip deformation increases. The COD is defined as the resultant displacement at the crack tip when the crack mouth opening displacement is joined to the neutral axis.
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