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    Comparison Between Experimental and Analytical (Including Empirical) Results of Crack Growth Initiation Studies on Surface Cracks

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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

    Author Information:

    Reuter, WG
    Principal engineer, Idaho National Engineering,

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP27702S