Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 16, 2018
This paper describes mechanical properties of Fiber-reinforced self-healing ceramics (shFRC) affected by shape stability of fiber bundle. The shFRC was proposed one of the candidates for turbine blade, because this material has high reliability consisted of fiber-reinforcing and self-healing. When crack was initiated in shFRC, the crack is forced not to progress by fiber bundle and can be branched along interlayer designed as weakest region. After this mechanism, the crack is filled up and bonded by oxidation of non-oxide interlayer. Finally, the strength of shFRC recovers. However, the cause of strength dispersion for shFRC is unexplained, so policy about process parameters cannot be determined. The point is that there is some roughness on the fiber bundle interlayer after coating process. The scale of roughness is the same as thickness of interlayer and pores in the material. Thus, there is a possibility that shape stability of fiber bundle affect the mechanical properties of shFRC. Therefore, this study tried to evaluate the shape stability and investigate relationship between the shape stability and the mechanical properties of shFRC. As a result, the shape stability can be evaluated by using average values and standard deviation arithmetic mean roughness about fiber bundles after coating process. And as result of tensile test, strengths of interlayer are affected by the shape stability. Hence the shape stability is one of the effective process parameters for shFRC.
