エポキシ樹脂及び不飽和ポリエステルの引張特性に及ぼす強化CFRPの影響

抄録

Carbon-fiber-reinforced plastic (CFRP) is one of the composite materials which have been employed widely in our society. In addition to the low density of CFRP, the tensile strength is 10 times higher than that of the conventional steel. Due to various fields used, the production amount has increased in recent years. However, there is a problem for CFRP: lack of recycling method for used CFRP. In the present work, an attempt was made to propose recycled CFRP (rCFRP) technology, in which used CFRP was crushed with two different sizes: 0.1 mm × 0.007 mm (milled CFRP) and 30 mm × 2 mm (chopped CFRP). In addition, two different resins were employed: epoxy and unsaturated polyester. The tensile properties were experimentally investigated. With increasing the chopped CFRP, the tensile strength increased for both unsaturated polyester and epoxy resin samples, while the reduction of ductility occurred. Thus, chopped CFRP reinforced both resins. On the contrary, the material ductility enhanced with increment of the milled CFRP until 20%, which is attributed to the change of the material characteristics: dimple based failure occurred with addition of the milled CFRP. However, rCFRP for a high content of milled CFRP 30% made the large size of blow holes leading to low ductility.