Abstract
Effect of post heat treatment on tensile strength distribution and its size effect of poly-p-phenylene benzobisoxazole (PBO) fiber were investigated in monofilament tests. Two-parameter Weibull distribution adapted for dependence of fiber strength for both length and diameter direction. It was found that the tensile strength of PBO fibers showed size effect regardless of post heat treatment for both length and diameter direction. The size effect of tensile strength in diameter direction was larger than that in longitudinal direction. For relatively long gauge lengths (12.5mm and over), the tensile strength distribution separated size effect in diameter direction well fitted the Weibull distribution function with 2 parameters. For relatively short gauge lengths (under 12.5mm), it did not fit because distribution of fiber strength was lower than that of strength related to end fracture. The size effect of fiber strength for both length and diameter direction was increased by post heat treatment because crystalline regions increased by heat-treatment and fiber became brittleness.
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