STP833

    Influence of Loading Rate on the Fracture Toughness of Some Structural Steels in the Transition Regime

    Published: Jan 1984


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    Abstract

    The fracture toughness of five structural steels was determined as a function of temperature in static and dynamic conditions (˙K ≈ 2 × 104 MPa √m/s). The most significant effect of increasing the strain rate was to shift the KIc-temperature curve towards higher temperatures. The amplitude of the temperature shift between the transition temperatures obtained in static (TKIc) and dynamic (TKId) conditions were compared with the predictions given by different models. It appeared that the variations of yield strength cannot always account for the change of fracture toughness with temperature and strain rate.

    A correlation between Charpy V-notch (CVN) transition temperature (TK 28) and dynamic toughness transition temperature (TKId) was established. This correlation is an extension of the one proposed previously between TK 28 and TKIc. Assuming that fracture toughness transition is a thermally activated process, it was possible to calculate theoretically the slopes of the correlations; these were found to be in good agreement with the experimental results.

    Keywords:

    fracture properties, toughness, dynamic tests, Charpy V-notch, steels, correlations


    Author Information:

    Marandet, B
    Institut de Recherches de la Sidérurgie Française (IRSID), St. Germain en Laye, Cedex,

    Phelippeau, G
    Institut de Recherches de la Sidérurgie Française (IRSID), St. Germain en Laye, Cedex,

    Sanz, G
    Institut de Recherches de la Sidérurgie Française (IRSID), St. Germain en Laye, Cedex,


    Paper ID: STP32577S

    Committee/Subcommittee: E08.07

    DOI: 10.1520/STP32577S


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