等方性セラミック繊維のねじりおよび引張特性

概要

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Torsional and tensile tests of alumina and silicon carbide fibers from precursors were carried out. Their shear moduli, torsional strengths, Young's moduli and tensile strengths were evaluated and compared. Their shear moduli are about one half of their Young's moduli. Their fracture surfaces show the characteristic feature of isotropic brittle structure. The measured torsional strength of the alumina fiber coincides with that deduced from the tensile strength. Thus, this fiber has extremely isotropic properties of not only structure and moduli but also of strength. However, the measured torsional strength of the silicon carbide fiber is weaker than that deduced from the tensile strength. As for this reason, it is supposed that the sheath is weaker than the core and/or defects are preferentially oriented to the fiber axis.
一般社団法人日本機械学会の論文
1991-03-25