2749 SiC/SiCミニコンポジットの繰返し変形挙動(S18-2 セラミックス(2),S18 セラミックスおよびセラミックス系複合材料)

概要

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The tension-tension fatigue tests for SiC/SiC composites were performed under the conditions with the maximum load P_<max> of 80-90% to tensile strength and the stress ratio was R_σ=0.5. The composites exhibited non-linear behaviors under one load cycling. In some cases the mean strain ε_<mean> gradually increase with increasing in number of cycles. These variations would reflect the developments of the fatigue damage at the fiber/matrix interface and the fiber broken during the cyclic loading process. The SiC fiber bundle specimen with 800 fibers was also subjected to cyclic loadings. The non-linear behaviors were also shown in the fiber bundle specimen, despite single SiC fiber exhibits linier elastic behavior. It was guessed from the cyclic loading test of fiber bundle specimen with machine oil that the friction between fibers affects on the stress-strain response in cyclic loadings.
2007-09-07