Effect of Notch Geometry on Rupture Strength at Elevated Temperatures

    Published: Jan 1953

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    Three series of creep-rupture tests of notch bars with varying geometry of the notch were performed at elevated temperatures on several heat-resistant alloys. The effect on notch sensitivity of the following were also investigated: stress level, grain size, hardness, ductility, and heat treatment. Increasing the sharpness of the notch with constant-depth notches may raise or lower the notch sensitivity depending on the ductility and microstructure of the alloy. The size effect or effect of shank diameter can be practically eliminated by using a “standard” notch geometry. The notch sensitivity is accentuated by increasing the depth of the notch to about one-fourth of the shank diameter. It is postulated that the fracture originates just below the surface at the root of the notch.

    Author Information:

    Davis, E. A.
    Westinghouse Research Laboratories, East Pittsburgh, Pa.

    Manjoine, M. J.
    Westinghouse Research Laboratories, East Pittsburgh, Pa.

    Committee/Subcommittee: E04.05

    DOI: 10.1520/STP41685S

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