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Presently, continuous-fiber ceramic composites (CFCCs) are considered leading candidate materials for many high-temperature applications, such as high-pressure heat exchangers, radiant burner tubes, and engine combustors. To adequately evaluate these materials in their cylindrical configurations, a hoop tension test is needed.
A hydrostatic pressurized test was developed to obtain the hoop tensile strength from ambient to elevated temperatures (> 1500°C). The method allows only hydrostatic pressure to develop inside the cylinder to cause failure from a hoop tensile stress.
This test method evolved from testing monolithic ceramics to continuous-fiber ceramic matrix composite (CMC) tubes. The results of early hydrostatic tests are briefly reviewed. A highlight of one test identified fiber tow pull-out at 1000°C where the tube indicated localized aneurysm-type deformation. Another CFCC material system, evaluated at room temperature, exhibited fiber pull-out on the order of 5 to 7 mm. The circumferential elastic modulus was also obtained.
Group leader and senior research ceramist, University of Dayton Research Institute, Dayton, OH
Associate materials scientist, University of Dayton Research Institute, Dayton, OH
Stock #: CTR10029J