Abstract:Abstract. In this paper, tensile and fatigue strength of standard modulus type (As spun: AS) and high-modulus type (HM) poly-p-phenylene benzobisoxazole (PBO) fiber improved tensile modulus by heat-treatment have been investigated. The tensile tests of a monofilament were carried out at a gauge length of 12.5 mm and deformation rate of 0.5 mm/min. The fatigue tests of a monofilament were carried out to determine the S-N property at a frequency of 10 Hz with three stress ratios of 0.1, 0.5 and 0.7. It was found… Show more
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