繊維強化樹脂基複合材料の衝撃・圧縮破壊特性と水環境効果

概要

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An investigation of water absorption effects on the impact fracture mechanism and compression after impact (CAI) behavior was conducted using carbon fiber reinforced thermoplastic matrix composite (AS-4/PEEK) and aramid fiber reinforced epoxy matrix composite (K-49/828), which have a quasi-isotropic stacking sequence of [0°/±45°/90°]_<2s>. The impact tests were carried out using a falling weight tester. Impact-induced internal damage was observed with a scanning acoustic microecope (SAM). The delamination area was evaluated by the subtraction method. The delamination area of AS-4/PEEK was much smaller than that of a CF/epoxy composite (MM-1/982X), and no influence of water absorption was observed. In contrast, that of K-49/828 was the largest, and the impact-load-induced delamination area was increased by water absorption. In the case of AS-4/PEEK the compressive strength of the impacted specimen at 3 J was the same as that of a virgin specimen, and no influence of water absorption was observed. Impact energy affected the CAI strength of K-49/828 as much as that of MM-1/982 X. The fracture surface was closely examined using a scanning electron microscope, and the fracture mechanisms were discussed.
1997-06-25