STP590: Effect of Specimen Size on Fracture Toughness of a Titanium Alloy

    Munz, D
    DFVLR, Institut für Werkstoff-Forschung, Linder Höhe,

    Galda, KH
    DFVLR, Institut für Werkstoff-Forschung, Linder Höhe,

    Link, F
    DFVLR, Institut für Werkstoff-Forschung, Linder Höhe,

    Pages: 16    Published: Jan 1976


    This paper describes the effect of specimen size on slow crack growth and fracture toughness of the titanium alloy Ti-6A1-4V. The load versus crack opening displacement curve rises steeply after reaching the end of the linear part. Stable crack extension starts within the linear part of the P-v-curve. The crack growth resistance curve is independent of thickness B until KQ in the range 2 < B < 20 mm, leading to the conclusion that slow crack growth can occur in plane strain.

    The secant method, leading to KQ at 2 percent crack extension, yields a specimen geometry dependent fracture toughness. KQ increases with width, W and is only slightly dependent on thickness, B.

    The consequences of this behavior for fracture toughness determination in connection with the ASTM recommendation are discussed.


    fracture properties, crack propagation, toughness, titanium alloys, tests

    Paper ID: STP33948S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP33948S

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