Tensile testing of single‐crystal Al 2 O 3 fibers was conducted using a hot‐grip method developing during this study. Fracture strength was measured between 25° and 1500°C and was found to decrease with increasing temperature. However, a strength minimum, observed by others between 400° and 900°C, appeared to be absent The experimental results are in good agreement with calculated fracture strength values based on the fracture toughness of cleavage planes up to 1200°C. Strain rate experiments carried out at 1300°C indicate that strength is strongly time dependent. Fracture originates from both surface flaws and internal pores in the fibers.
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Ünal et al. (1994) studied this question.
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