STP700: Elastic-Plastic Fracture Mechanics for High-Temperature Fatigue Crack Growth

    Sadananda, K
    Research metallurgist and supervisory metallurgist, Thermostructural Materials Branch, Material Science and Technology Division, Naval Research Laboratory, Washington, D.C.,

    Shahinian, P
    Research metallurgist and supervisory metallurgist, Thermostructural Materials Branch, Material Science and Technology Division, Naval Research Laboratory, Washington, D.C.,

    Pages: 12    Published: Jan 1980


    Abstract

    Application of linear elastic and elastic-plastic fracture mechanics parameters to high-temperature fatigue crack growth is examined to determine which parameter provides a better correlation of crack growth data. It is concluded that the J-integral concept is applicable to fatigue, and methods of determination of J for both load-controlled and displacement-controlled fatigue are discussed. The J-integral parameter is shown to be better than the linear elastic parameter K in correlating fatigue crack growth, particularly so in materials that undergo metallurgical changes during test resulting in changes in flow properties. Application of the J-integral concept to time-dependent and combined cycle and time-dependent crack growth is discussed in detail.

    Keywords:

    fracture mechanics, fatigue, creep, crack growth, high temperature, J-integral, load-controlled, displacement controlled, time dependent, fractures (materials), crack propagation


    Paper ID: STP36969S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP36969S


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