コースティックス法による部分安定化ジルコニアセラミックスの高温動的破壊挙動の解析

概要

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The validity of the caustic method on the fracture problems of partially stabilized zirconia at room and elevated temperatures up to 1200℃ is confirmed, and we investigated the dynamic fracture behavior of this material from the pictures taken using the apparatus of caustics together with an ultrahigh-speed camera of Imacon 790. Consequently, it is pointed out that dynamic fracture toughness K_<Id> is abruptly decreased as the testing temperature increases over about 500℃ and the ratio of K_<Id> and static fracture toughness is increased from 2.0 at room temperature to 5.0 at 800℃. Moreover, it is ascertained that the crack-propagation fracture toughness is increased with the crack velocity at any testing temperature up to 1200℃ and this tendency is decreased with the rise of temperature. Finally, an example of the visualized acoustic emission wave is shown. It is revealed that the velocity of this AE-wave is slightly decreased as the temperature rises and it coincides with the Rayleigh wave speed of this material.
社団法人日本機械学会の論文
1993-03-25