炭素繊維強化PEEK樹脂基複合材料の疲労破壊特性に及ぼす応力波形・水環境効果

概要

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The influences of stress waveform and water absorption on the tension-tention fatigue fracture behavior were investigated in a carbon fiber reinforced poly-ether-ether-ketone matrix composite (AS-4/PEEK), having an angle-ply stacking sequence of [±45゜] _<3s>. The fatigue tests were performed under sinusoidal, negative pulse and positive pulse waveforms on specimens preconditioned in dry air (dry specimens) and the ones which were immersed in deionized water at 80℃ for two months (wet specimens). For dry specimens, the fatigue strength under positive pulse waveform was the highest, and decreased in the order of negative pulse waveform, sinusoidal waveform. For wet specimens, the fatigue strength under positive pulse waveform showed the lowest. Internal damage was observed with a scanning acoustic microscope (SAM) and the fracture surface was closely examined using a scanning electron microscope (SEM).
2001-03-25