Abstract
The validity of the caustic method on the fracture problems of partially stabilized zirconia at room and elevated temperatures up to 1200°C 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 KId is abruptly decreased as the testing temperature increases over about 500°C and the ratio of KId and static fracture toughness is increased from 2.0 at room temperature to 5.0 at 800°C. Moreover, it is ascertained that the crack-propagation fracture toughness is increased with the crack velocity at any testing temperature up to 1200°C 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.
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