Investigation and modeling of the elastic-plastic fracture behavior of continuous woven fabric-reinforced ceramic composites

摘要

The paper describes a study which attempted to extrapolate meaningful elastic-plastic fracture toughness data from fiexure tests of a chemical vapor-infiltrated SiC / Nicalon fiberreinforced ceramic matrix composite. Fibers in the fabricated composites were pre-coaed with pyrolytic carbon to varying thiknesses. In the tests, crak length was not measured and the study employed an estimation procedure, previously used successfully for ductile metals, to derive J-R curve information. Results are presented in normalized load vs. normalized displacements and comparative J_(Ic) behavior as a function of fiber precoating thickness.