Si-Ti-C-O繊維/SiC基複合材料の高温クリープ変形(クリープ,OS.14 先進材料の力学)

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The present work investigates the high temperature creep deformation of Si-Ti-C-O fiber/SiC Matrix composites. Since an examination is performed in the high temperature atmosphere, the surface of this composite material is covered with the glass sealant for oxidization prevention. In this study, tensile creep testing was conducted at 1200℃ in air. For creep stresses between 80 and 160MPa, creep rate decreased continuously with time. Generally steady-state creep rate, dε_<cr>/dt, is represented by Bailey-type and the stress exponent is constant. However, in this composite material, the stress exponent decreased with creep time. Therefore, a new creep deformation formula was proposed by considering the time dependent stress exponent. Using this formula, the effect of loading rate on stress/strain behavior was examined. The estimated curve based on strain hardening agreed with the experimental results. The creep deformation generated in the high temperature and a short-term was influenced by hardening, and had appeared as loading rate dependability.
社団法人日本機械学会の論文
2004-03-03