セラミックスの圧縮試験法の検討

概要

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In the previous paper, we reported several results of the compressive test for ceramics, and also proposed a dumbbell-type specimen and suitable equipment for measuring actual compressive strength. This paper discusses the fracture mechanism of ceramics under a compressive load and the edge effects in the specimen, using additional results for an acoustic emission (AE) test and the brittle fracture criterion under multiaxial stress. The results are as follows. (1) The compressive strength of ceramics is about 11 times as much as the tensile strength for Si_3N_4. (2) AE sounds are detected at the early stage of the compressive load, whose value coincides with the value estimated by means of the fracture criterion ; namely, about 22% of the fracture load. (3) The dumbbell-type specimen is highly recommended for ceramics as an edge effect-free specimen.
社団法人日本機械学会の論文
1993-07-25