セラミックファイバーのねじり及びループ試験の理論計算と測定結果の検討

概要

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The correspondence between theoretical concept and the experimental fracture behaviors of ceramic fibers such as Pitch based and PAN based carbon fibers, alumina and glass fibers were discussed using twisting test and the loop test. In twisting test under the combined stress, the theoretical value of tensile strength was approximately consistent with the measurement value of that in Pitch based carbon fibers. Thus correspondence was not confirmed in PAN based carbon fibers by the effect of structural anisotropic. In the loop test, the fracture surfaces of alumina, carbon and glass fibers in- dicated a typical pattern containing a line shape, which appeared on the compression side of alumina fibers and on the tension side of carbon and glass fibers. These fracture morphologies are interpreted as being locations of crack initiation (tension side in alumina and compression side in carbon) by bend-breaking. The loop test proved to be a useful and sim- ple method to identify the fracture process.
長崎大学の論文