擬似等方性炭素繊維強化プラスチックの疲労特性 : 2段変動荷重試験における疲労寿命の調査(FRPの疲労・環境破壊,OS.14 先進材料の力学)

概要

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This paper presents characteristics of variable loading of the polymer matrix composites. The specimens were the quasi-isotropic graphite/epoxy laminates;[-45/0/45/90]s, tension-tension fatigue loading was applied on condition that stress ratio R equaled 0.1. It was found that S-N diagram was linear in the range of this study. Two-step fatigue damage loading was applied to investigate applicability of cumulative damage law. The results of fatigue tests were not good agreement with the Linear Cumulative Damage rule (LCD: Palmgren-Miner's rule) at the condition of the high-low and low-high sequences. Several tests were stopped before ultimate failure to investigate the residual strength; the availability of the residual strength as a paramater of cumulative damage rule was discussed.
2004-03-03