2324 人工関節用ジルコニアにおける微視破壊過程のAE法による評価(S32-3 セラミックスおよびセラミックス系複合材料(3),S32 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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Microfracture process of zirconia for artificial joints was evaluated using the acoustic emission technique. In order to investigate the effects of environment and strain rate on the microfracture process, four point bending tests were carried out in air and physiological saline at various loading rates. From the AE behavior, rapid AE increasing point was observed before the final fracture. It was suggested from the previous work that the point corresponds to the maincrack formation. The critical stress for maincrack formation, σ_C, was determined from the bending stress at the point. The critical stress as well as bending strength, σ_B, decreased in physiological saline. In particular, the decrease in critical stress was remarkable. It was then understood that stress corrosion cracking by water in physiological saline affected maincrack formation rather than the final fracture. Consequently, it was suggested that the evaluation of σ_C is essential for the reliability assessment of bioceramics.
一般社団法人日本機械学会の論文
2005-09-18