Strength of a Ceramic Sectored Flexural Test Specimen

    Volume 36, Issue 1 (January 2008)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 16 August 2007

    Page Count: 7


    Wereszczak, A. A.
    Senior Staff Scientist and Post-BS Research Associate, Ceramic Science and Technology Group, Oak Ridge National Laboratory, Oak Ridge, TN

    Duffy, S. F.
    Professor, Civil Engineering Department, Cleveland State University, Cleveland, OH

    Principal, Connecticut Reserve Technologies, Inc., Strongsville, OH

    Baker, E. H.
    Principal, Connecticut Reserve Technologies, Inc., Strongsville, OH

    Swab, J. J.
    Ceramic Engineer, Ordnance Materials Branch, U.S. Army Research Laboratory, Aberdeen Proving Ground, MD

    Champoux, G. J.
    Senior Staff Scientist and Post-BS Research Associate, Ceramic Science and Technology Group, Oak Ridge National Laboratory, Oak Ridge, TN

    (Received 12 January 2007; accepted 20 June 2007)

    Abstract

    A new test specimen, defined here as the “sectored flexural strength test specimen,” was developed to measure the strength of ceramic tubes specifically for circumstances when flaws located at the tube’s outer diameter are the strength-limiter when subjected to axial tension. The understanding of such strength-limitation is relevant when ceramic tubes are subjected to bending or when the internal temperature is hotter than the tube’s exterior (e.g., heat exchangers). The test specimen is both economically and statistically attractive because eight test specimens (eight in the case of this project—but the user is not necessarily limited to eight) were extracted out of each length of tube. An analytic expression for maximum (or failure) stress, and relationships portraying effective area and effective volume as a function of Weibull modulus were developed. Lastly, it was shown through the testing of two ceramics that the sectored flexural specimen was very effective; it produced failures caused by strength-limiting flaws located on the tube’s original outer diameter.


    Paper ID: JTE100823

    DOI: 10.1520/JTE100823

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    Author
    Title Strength of a Ceramic Sectored Flexural Test Specimen
    Symposium , 0000-00-00
    Committee C28