Hoop Tensile Properties of Ceramic Matrix Composite Cylinders

    Volume 33, Issue 5 (September 2005)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 10 August 2005

    Page Count: 7


    Verrilli, MJ
    Materials Research Engineer, NASA Glenn Research Center, Cleveland, OH

    DiCarlo, JA
    Senior Technologist, NASA Glenn Research Center, Cleveland, OH

    Calomino, A
    Materials Research Engineer, NASA Glenn Research Center, Cleveland, OH

    Yun, HM
    Research Associate, Cleveland State University, Cleveland, OH

    Barnett, TR
    Test Engineer, Southern Research Institute, Birmingham, AL

    (Received 23 June 2004; accepted 22 February 2005)

    Abstract

    Tensile stress-strain properties in the hoop direction were obtained for 100-mm diameter ceramic matrix composite cylinders using ring specimens machined from the cylinder ends. The silicon carbide fiber-reinforced silicon carbide matrix composite (SiC/SiC) cylinders were fabricated from 2D balanced SiC fabric with several material variants, including wall thickness (6, 8, and 12 plies), SiC fiber type (Sylramic, Sylramic-iBN, Hi-Nicalon, and Hi-Nicalon S), fiber sizing type, and matrix type (full CVI SiC, and partial CVI SiC plus slurry cast + melt-infiltrated SiC-Si). Cloth ply splices existed in all the hoops. Tensile hoop measurements were made at room temperature and 1200°C using hydrostatic ring test facilities. Room temperature hoop strengths for the various cylinders were generally similar and at 1200°C, ultimate strengths and strains of the hoops were about 70 % of their room temperature values, and elastic moduli were about 90–100 % of their room temperature values. The hoop properties are compared with in-plane data measured on flat panels using same material variants, but containing no splices. A lower strength and failure strain of hoops compared to panels was observed and was due to a stress concentration associated with the cloth splice geometry. The failure mode of the hoops, determined through microstructural examination, revealed that a fracture surface always existed at the cloth ply splice on the inner diameter of the failed specimens.


    Paper ID: JTE12668

    DOI: 10.1520/JTE12668

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    Author
    Title Hoop Tensile Properties of Ceramic Matrix Composite Cylinders
    Symposium , 0000-00-00
    Committee C28