Principal engineer, Idaho National Engineering,
Pages: 23 Published: Jan 1988
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
Paper ID: STP27702S