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


    Abstract

    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.

    Keywords:

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


    Paper ID: STP33948S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP33948S


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