Fracture toughness of SIC, Si3N4, and sialon ceramics using controlled surface flaws

S.G. Cook, J.E. King, J.A. Little

    Research output: Contribution to journalArticlepeer-review


    Knoop and Vickers indentation cracks have frequently been used as model 'precracks' in ceramic bend specimens for fracture toughness (K1c) determination. Indentation residual stress reduces the measured K1c but can be removed or accounted for by grinding, annealing, or modelling. Values of K1c are obtained for four materials using Vickers indentations and an improved stress intensity factor. Methods for residual stress removal or incorporation are compared, and the most reliable stress removal alternative is identified for each material. © 1996 The Institute of Materials.

    Original languageEnglish
    Pages (from-to)366-370
    Number of pages5
    JournalMaterials Science and Technology
    Issue number4
    Publication statusPublished - Apr 1996


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