L. Chuck et Ga. Graves, HOOP TENSILE-STRENGTH AND FRACTURE-BEHAVIOR OF CONTINUOUS FIBER CERAMIC COMPOSITE (CFCC) TUBES FROM AMBIENT TO ELEVATED-TEMPERATURES, Journal of composites technology & research, 19(3), 1997, pp. 184-190
presently, continuous-fiber ceramic composites (CFCCs) are considered
leading candidate materials for many high-temperature applications, su
ch as high-pressure heat exchangers, radiant burner tubes, and engine
combustors. To adequately evaluate these materials in their cylindrica
l configurations, a hoop tension test is needed. A hydrostatic pressur
ized test was developed to obtain the hoop tensile strength from ambie
nt to elevated temperatures (>1500 degrees C). The method allows only
hydrostatic pressure to develop inside the cylinder to cause failure f
rom a hoop tensile stress. This test method evolved from testing monol
ithic ceramics to continuous-fiber ceramic matrix composite (CMC) tube
s. The results of early hydrostatic rests are briefly reviewed. A high
light of one test identified fiber tow pull-out at 1000 degrees C wher
e 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.