STP969

    Experimental Evaluation of an Equation Applicable for Surface Cracks Under Tensile or Bending Loads

    Published: Jan 1988


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    Abstract

    If a structural material behaves in a linear elastic manner, it is generally assumed that plane-strain fracture toughness (KIc) may be used with applicable solutions to predict conditions for catastrophic fracture. There have been a few instances where the adequacy of this approach has been verified, but these evaluations were conducted for specific applications. This paper evaluates an approach using specimens containing surface cracks, with substantial variations in crack size and shape, and loaded by either tension or bending. Test results are used to compare the critical stress-intensity factor (Kcrit) with KIc. Moiré interferometry is used to obtain KI at the free surface for comparison with the calculated result.

    Keywords:

    linear elastic fracture mechanics, surface cracks, tensile or bending loads, plane-strain fracture toughness, moiré interferometry, fracture mechanics


    Author Information:

    Reuter, WG
    Principal investigator and engineering specialist, Idaho National Engineering Laboratory, EG&G Idaho, Inc., Idaho Falls, ID

    Epstein, JS
    Principal investigator and engineering specialist, Idaho National Engineering Laboratory, EG&G Idaho, Inc., Idaho Falls, ID


    Paper ID: STP33096S

    Committee/Subcommittee: E08.07

    DOI: 10.1520/STP33096S


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