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Many investigations have identified geometry dependence of Jc at initiation of cleavage fracture and Ji at initiation of fibrous tearing. This geometry dependence is predictable from elastic-plastic finite element analyses, which show that the crack tip stress-strain distribution is not always uniquely defined by J. This paper investigates the ability of the elastic T stress to explain experimentally observed trends in Jc with changes in specimen geometry. Data on mild steel three-point bend and center-cracked tension specimens are presented.
fracture, J, T, stress, mild steel, three-point bend specimens, center-cracked tension specimen
Senior principal scientific officer, Admiralty Research Establishment, Dunfermline,