Journal Published Online: 10 August 2005
Volume 33, Issue 5

Hoop Tensile Properties of Ceramic Matrix Composite Cylinders



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.

Author Information

Verrilli, MJ
NASA Glenn Research Center, Cleveland, OH
DiCarlo, JA
NASA Glenn Research Center, Cleveland, OH
Calomino, A
NASA Glenn Research Center, Cleveland, OH
Yun, HM
Cleveland State University, Cleveland, OH
Barnett, TR
Southern Research Institute, Birmingham, AL
Pages: 7
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Stock #: JTE12668
ISSN: 0090-3973
DOI: 10.1520/JTE12668