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    STP1417

    Fatigue Crack Growth Mechanisms in Alumina at High Temperature

    Published: 01 January 2003


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    Abstract

    The wake fracture process zone (FPZ) of an alumina WL-DCB specimen subjected to cyclic loading at room temperature to 800°C was analyzed by a hybrid experimental-numerical procedure involving phase-shifting moiré interferometry and finite element analysis. A residual crack opening profile was found upon unloading and remained during subsequent cyclic loading. This anomaly is attributed to the butting of fully and partially pulled-out grains and provides a mechanistic explanation for the common notion that monolithic ceramics do not fatigue.

    Keywords:

    fatigue, alumina, fracture process zone


    Author Information:

    Kokaly, MT
    Research Engineer, Fatigue Technology Inc., Seattle, WA

    Kobayashi, AS
    Professor Emeritus, University of Washington, Seattle, WA

    White, KW
    Professor, University of Houston, Houston, TX


    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP11092S