Abstract
It is known that the single-modal Weibull model describes well the size effect of brittle fiber tensile strength. However, some ceramic fibers have been reported that single-modal Weibull model provided biased estimation on the gauge length dependence. The objective of this study is thus to assess if the Weibull parameters are dependent on the gauge length for the case of small gauge length samples. Tyranno ZMI Si-Zr-C-O fiber has been selected as an example fiber. To analyze the dependence of the Weibull parameters on the gauge length, the tensile tests have been done on several gauge lengths. The derived Weibull parameters have shown a dependence on the gauge length. Fracture surfaces were observed with SEM. Then we categorized fracture surfaces by four kinds of fracture patterns. The percentage of each fracture pattern was found variable with the gauge length.
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