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    Crack Growth in Creeping Solids

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    The creep crack growth behavior in a creep-ductile material, 6061 aluminum, and a creep brittle material, Ti-6242, has been investigated. In the creep ductile material an observed load dependency in the relation between the load-point displacement rate, ˙Δ, and the crack growth rate, ˙a, precluded the straightforward application of the C* approach. An alternative approach has been developed in which ˙Δ, ˙a, and P are interrelated through an equation of form ˙ΔPα˙aθ The exponent α determines the contribution of creep deformation to ˙Δ and therefore relates to the creep ductility or creep brittleness of the material. For both materials tested the foregoing relationship was able to describe the experimental results without any systematic scatter.


    creep crack growth, creep ductility, creep brittleness, parameter approach, creep crack opening displacement, elastic-plastic fracture

    Author Information:

    Radhakrishnan, VM
    Assistant director, Fatigue and Fracture Mechanics Group, Defense Metallurgical Research Laboratory, Hyderabad,

    McEvily, AJ
    Professor, University of Connecticut, Storrs, Conn

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP37322S