STP856

    On the Determination of Elastic-Plastic Fracture Material Parameters: A Comparison of Different Test Methods

    Published: Jan 1985


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    Abstract

    J-initiation values and J-resistance curves are the most promising candidates for the characterization of fracture resistance of materials used in the transition and upper shelf toughness region. Though their use for prediction of initiation of crack growth and of ductile tearing instability was successfully demonstrated in evaluations of large-scale tests, there still remain several problems concerning the determination of initiation values and generation of J-resistance curves. This paper reports on results of investigations conducted on different materials with different specimen types. It covers the comparison of different methods for initiation detection and J-resistance curve determination and the influence of side grooves and specimen dimensions. For both the measurement of J-initiation values Ji and J resistance JR, the DC potential drop technique, the partial unloading compliance technique, and the multiple specimen interrupted loading procedure were used on compact specimens with dimensions ranging from B = 12 5 to 100 mm. The tests were carried out in a temperature range of 25 to 600°C (77 to 1112°F). The generated J-resistance curves agree very well, but slightly different values of crack initiation were determined. The definition of initiation of crack growth is discussed.

    Keywords:

    fractures (materials), crack initiation, crack propagation, fracture tests, fracture toughness, elastic-plastic fracture, J integral, specimen size, fracture mechanics


    Author Information:

    Hollstein, T
    Senior scientist, head of metallic materials group, and senior scientist, Fraunhofer-Institut für Werkstoffmechanik, Freiburg,

    Blauel, JG
    Senior scientist, head of metallic materials group, and senior scientist, Fraunhofer-Institut für Werkstoffmechanik, Freiburg,

    Voss, B
    Senior scientist, head of metallic materials group, and senior scientist, Fraunhofer-Institut für Werkstoffmechanik, Freiburg,


    Paper ID: STP34520S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP34520S


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