STP1189: Static Fatigue in Dilatant-Zone-Toughened Ceramics

    Duan, K
    Postgraduate student, reader, and professor, Centre for Advanced Materials Technology, Department of Mechanical Engineering, University of Sydney, NSW

    Cotterell, B
    Postgraduate student, reader, and professor, Centre for Advanced Materials Technology, Department of Mechanical Engineering, University of Sydney, NSW

    Mai, Y-W
    Postgraduate student, reader, and professor, Centre for Advanced Materials Technology, Department of Mechanical Engineering, University of Sydney, NSW

    Pages: 9    Published: Jan 1993


    Abstract

    An approximate model is presented for the effect of crack-tip shielding due to dilatant zone toughening on subcritical crack growth in ceramics. This model relies on estimating the transformed zone from the applied stress intensity factor. Slow crack growth can be predicted with this model in ceramics toughened by the stress-triggered martensitic transformation in zirconia-bearing ceramics, if the slow' crack growth data for the same ceramic with the transformation either already completed by thermal aging or suppressed by stabilizers is known.

    Keywords:

    transformation-toughened ceramics, static fatigue, subcritical crack growth, magnesia-stabilized zirconia, zirconia-toughened alumina, fracture mechanics, fatigue (materials)


    Paper ID: STP24302S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP24302S


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