Thermosetting resin has been mainly used for CFRP (carbon fiber reinforced plastics) since their high specific strength and specific rigidity open the new frontier of airplane, space, military affairs and sports. However, it is still difficult to apply CFRP to mass produced productions although the price of carbon fiber is getting down. One of the big barriers is that mechanical properties, in especially impact energy absorption ability, of CFRP decrease extremely after recycling. The reason is well known that the fiber length of recycled CFRP becomes shorter than that of fresh CFRP. In this paper we investigate an effect on the properties of recycled CFRP of the addition of aramid fiber which has high impact energy absorption ability.
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