超音波顕微鏡によるCFRP円孔切欠材の疲労層間はく離進展特性評価と吸水効果

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This paper describes the influences of circular hole and water absorption on the tension-tension fatigue delamination growth behavior of a carbon fiber reinforced epoxy matrix composite material. The composites used were [0°/±45°/90°]_<2S> quasi-isotropic and [0°/90°]_<4S> cross-ply laminates. Dry and wet specimens were used, which had been respectively preconditioned in air and in water at 80℃ for two months. Tests were conducted in air for dry specimens and in water at 25℃ for wet specimens. Ply-to-ply fatigue delamination behavior was nondestructively and quantitatively examined with a scanning acoustic microscope operating in the reflection mode. In the case of quasi -isotropic laminates with a circular hole, delamination around a hole occurred at the first/second and the second/third interplies. As for flat specimens, however, the edge delamination occurred in the second/third and third/fourth interplies. In the case of circular notched cross-ply laminates, delamination initiated and grew around the hole at the first/second interply, although no conspicuous edge delamination was observed in flat specimens. Water absorption promoted delamination growth in both laminates. Compliance changes with fatigue loading were measured. We discuss the dominating factor in compliance changes especially from the standpoints of fatigue delamination area and the operating fracture mechanisms, including the influences of water absorption on fatigue delamination.
1993-12-25

超音波顕微鏡によるCFRP円孔切欠材の疲労層間はく離進展特性評価と吸水効果

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