炭素繊維強化複合材料積層板のモードIIとIIIの混合モード破壊の安定進展条件下における破壊抵抗の評価

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  • Characterization of Fracture Resistance of Carbon/Epoxy Composite Laminates during Mixed-Mode II and III Stable Damage Propagation
  • 炭素繊維強化複合材料積層板のモード2と3の混合モード破壊の安定進展条件下における破壊抵抗の評価
  • タンソ センイ キョウカ フクゴウ ザイリョウ セキソウバン ノ モード 2 ト 3 ノ コンゴウ モード ハカイ ノ アンテイ シンテン ジョウケン カ ニ オケル ハカイ テイコウ ノ ヒョウカ

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Mixed mode II and III interlaminar fracture resistance of cross-ply carbon/epoxy composite laminates was experimentally and numerically evaluated using DNSCB (double notched split cantilever beam) test method, which enables a stable interface damage growth under the mixed-mode condition. Specimens with initial delaminations at two interfaces of 0° layers were used. The fracture morphology strongly depended on the mixed mode ratio. Complex damage comprising delaminations and inclined matrix cracks grew in the middle of the specimen where mode III component was dominant, while simple delaminations propagated outside the region of the complex damage where mode III component was comparatively small. Apparent dependence of the fracture toughness on the mixed-mode ratio was not found in the results obtained from the region of the simple delamination. The fracture resistance was considerably higher in complex damage region than in the region of simple delamination as expected from the significance of the damage state.

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