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.

Issue Section:
Research Papers
Keywords:
hoop tensile strength, pressurized cylindrical specimen, ceramic, continuous-fiber ceramic composite (CFCC), high temperature, mechanical properties, fracture behavior, diametral strain

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