STP969

    Three-Dimensional Effects Affecting the Precision of Lifetime Predictions

    Published: Jan 1988


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    Abstract

    A series of laboratory experiments on smooth and side-grooved compact specimens, as well as plates under tension with surface flaws, has been reevaluated by means of three-dimensional elastic-plastic finite-element analyses. Particular emphasis is laid on the calculation of the local crack-tip loading parameter, J, and of the local constraint factor, q. These parameters are correlated with experimental findings concerning initiation and stable crack propagation. A first-guess correlation between q and the slope of Ja) curves is established.

    Keywords:

    fracture mechanics, finite-element method, J, (Δ, a, ) curves, initiation, crack propagation, triaxiality of the stress-strain state (constraint)


    Author Information:

    Kordisch, H
    Head, Numerical Stress Analysis, and director, Fraunhofer-Institut für Werkstoffmechanik, Freiburg,

    Sommer, E
    Head, Numerical Stress Analysis, and director, Fraunhofer-Institut für Werkstoffmechanik, Freiburg,


    Paper ID: STP33070S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP33070S


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