P045 PBO繊維の疲労強度に及ぼす微細構造の影響(フェロー賞表彰対象ポスターセッション)

概要

論文の詳細を見る
In this paper, the fatigue strength of high-modulus (HM) type poly-p-phenylene benzobisoxazole (PBO) fiber improved tensile modulus by heat-treatment have been investigated. 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. AS span (AS) type PBO fiber that authors reported its properties before was employed as standard specimen. The fatigue strength of HM type PBO fiber was higher than that of AS type fiber over all fatigue lives. The relation between the stress amplitude and fatigue life depended on the stress ratio. However, the relation between the maximum stress ratio and fatigue life was independent of the stress ratio. Therefore, it was found that the maximum stress was useful to describe the fatigue lives at the different stress ratios. Additionally, the factor governing fatigue fracture tended to vary from the mean stress to stress amplitude at the low stress ratio because crystalline regions increased by heat-treatment and fiber became brittleness.
一般社団法人日本機械学会の論文
2007-10-24