Abstract
For studying the mechanical properties of composite material at high temperature, fatigue and creep tests were carried out for two types of ceramics matrix composites, that is, the reaction bonded and the precursor SiC/SiC composites. And then analysis of data regression was conducted for evaluating damage accumulation. As a result, following conclusions were obtained. 1) At room temperature, fatigue strength of precursor CMC is above twice higher than that of reaction bonded CMC, but at 1 300°C, fatigue strength of both composites is reversed in the range of longer life. 2) Fatigue and creep strength of reaction bonded CMC correspond each other if it is explained that fractures are caused by the crack extension process of time dependence except for flexure strength. 3) In precursor CMC, fatigue and creep strength for a short term coincide with flexure strength, which can be also explained by the crack extension process of time dependence. But high temperature strength for a long term rapidly decline because of internal oxidation.
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