炭素繊維強化エポキシ積層板の混合モードＩ＋ＩＩ繰返し荷重による層間疲労き裂進展挙動

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タイトル別名
  • Mixed-Mode (I+II) propagation of Delamination Fatigue Cracks in Unidirectional Graphite/Epoxy Laminates.
  • タンソ センイ キョウカ エポキシ セキソウバン ノ コンゴウ モード 1 2 クリカエシ カジュウ ニ ヨル ソウ カン ヒロウ キレツ シンテン キョドウ

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説明

Mixed-mode propagation behavior of interlaminar fatigue cracks was studied with unidirectional graphite/epoxy laminates. T800H/# 3631. Mixed-mode fatigue tests were conducted by the mixed-mode bending method under a stress ratio of R=0.2. The mixed-mode ratio, GI/GII, was 0.030, 0.19, 0.57 and 1.37. When the crack propagation rate da/dN, was correlated to the maximum value of the total energy release rate, Gmax, the propagation rate increased as the GI/GII value increased. For each mixed-mode ratio, the crack propagation rate was given by a power function of the maximum value of the energy release rate in the region of rates above 10-9m/cycle. The exponent of the power function decreased as the GI/GII value decreased. Below da/dN=10-9m/cycle, there exists the threshold for fatigue crack propagation. At the threshold, the relation between the mode I and mode II components of the maximum energy release rate, GImax and GIImaxth, is given by the following equation : GImax/GImaxth+GIImax/GIImaxth=1, where GImaxth and GIImaxth are the threshold values of the maximum energy release rate for pure mode I and pure mode II loadings.

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