STP1392: Surface Finish and Notch Effect Model for Strength Predictions of Continuous Fiber Ceramic Composites (CFCCs)

    Ramulu, M
    Professor, University of Washington, Seattle, WA

    Jenkins, MG
    Associate professor, University of Washington, Seattle, WA

    Kunaporn, S
    Graduate student, University of Washington, Seattle, WA

    Pages: 12    Published: Jan 2000


    Surface texture and process defects resulting from net-shape machining of continuous fiber ceramic composites (CFCCs) are often ignored in the design and analysis of component parts. Recently a mathematical model was proposed which defines the effects of surface texture and notch effects on the strength of engineering components in terms of an effective stress concentration factor (kt). This model was experimentally verified using flexural strength resulting for a graphite/bismaleimide laminate. A further verification of the model applied to CFCC materials is presented in here using tensile test results. It was found that the model successfully predicts the retained strength of CFCCs resulting from net-shape machining over a large range in surface quality.


    ceramic composite, surface roughness, notch effect, stress concentration

    Paper ID: STP15012S

    Committee/Subcommittee: C28.07

    DOI: 10.1520/STP15012S

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