High Temperature Spalling of Alumina Bars

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Abstract
Spalling experiments with alumina bars performed at temperatures up to 1500°C have been conducted in a new apparatus. A cylindrical uninstrumented specimen is located in an open-end furnace and dynamically loaded in tension by the reflection of a compressive pulse from its free end. A bridging piece of the same impedance covers the transition zone between the measuring rod and the specimen, which is positioned in the homogeneous part of the thermal field within the furnace. The data acquisition consists of the measuring of the incoming and reflected pulses in the transmitter, the temperature distribution in the furnace, and the positions of the spalling sites in the specimen. The evaluation procedure takes into account the high-temperature corrections, due to temperature-induced drop in the wave velocity and impedance of the bridging piece. This results in the change of the dispersion and the shape of the pulse. The results of the experiments show that the strength drop with the temperature growing up to 1500°C

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