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Surface-cracked specimens are used to simulate the behavior of structures containing defects. For these ferritic steel specimens, the test temperatures of 255 and 297 K corresponded to the lower shelf and the lower region of the ductile-brittle transition curve, respectively. Therefore, the conditions tested ranged from elastic to elastic-plastic to fully plastic with only small changes in tensile properties but substantial changes in fracture toughness. This paper compares experimental results based on crack initiation for the surface-cracked specimens with predictions of JIc and on an empirical correlation using the flow stress.
surface cracks, ferritic steel, fracture toughness, fracture mechanics, nonlinear fracture mechanics
Principal engineer, Idaho National Engineering,