Abstract
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.
Keywords:
ceramic, continuous-fiber ceramic composite (CFCC), diametral strain, fracture behavior, high temperature, hoop tensile strength, mechanical properties, pressurized cylindrical specimen
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Author Chuck L, Graves GA
Title Hoop Tensile Strength and Fracture Behavior of Continuous Fiber Ceramic Composite (CFCC) Tubes from Ambient to Elevated Temperatures
Symposium ,
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