一方向強化ＣＦ／ＰＥＥＫ積層板のモードＩ層間はく離疲労き裂伝ぱ挙動

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  • Mode I propagation of delamination fatigue cracks in unidirectional CF/PEEK laminates.
  • 1ホウコウ キョウカ CF PEEK セキソウバン ノ モード 1 ソウカン

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The effect of the stress ratio on the near-threshold growth of delamination fatigue cracks was investigated with unidirectional laminates made from ICI APC-2 thermoplastic prepregs (AS4/PEEK). Tests were carried out under mode I opening loading by using double cantilever beam specimens with a special loading device in which the geometrical non-linearity is negligible for the calculation of the energy release rate. The crack growth rate under different stress ratios was a unique function of the equivalent stress intensity range proposed by the authors. The fatigue crack growth rate near the threshold was controlled by the stress range rather than by the maximum stress. The fatigue crack growth resistance of APC-2 laminates was much higher than that of conventional CF/epoxy laminates even near the threshold region. The increase in resistance of fatigue crack growth, however, was smaller than that in fracture toughness. The difference of the growth behavior between CF/PEEK and CF/epoxy laminates was discussed on the basis of the fractographic observation and mechanism consideration.

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