815 直交三次元織物チラノ繊維強化セラミックス基複合材料の室温における疲労挙動について

概要

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Continuous fiber reinforced ceramic matrix composites (CMCs) exhibit fatigue fracture under static and cyclic loading. The monotonic and fatigue behavior of an orthogonal 3-D woven Tyranno ^<TM>Lox-M fiber reinforced Si-Ti-C-O matrix composite made by PIP (polymer infiltration and pyrolysis) was investigated at ambient temperature. The ultimate tensile strengths of the composite decreased with decreasing loading rate. Based on in-situ fiber strength estimation, it was revealed that the time dependency of the monotonic tensile strength was due to stress corrosion cracking (SCC) of Tyranno fiber. Cyclic fatigue tests were performed at frequency of 0.2 and 20 Hz and stress ratio R=0.1 at ambient temperature. Fatigue lifetimes decreased with decreasing frequency. Using simple models, it was suggested that the dominant fatigue mechanisms of the composite were stress corrosion cracking of fiber and degradation in the interface sliding stress. Therefore, both fatigue time and the number of cycles affected the fatigue behavior of the composite at ambient temperature.
社団法人日本機械学会の論文
2002-03-14