Abstract
This study was done to clarify the influence of complex deterioration on fatigue crack propagation (FCP) mechanism. Especially, Influences of the recycling process and fatigue for carbon-fiber-reinforced PEEK were attention to. The main results were as follows : (1) It was noted that the FCP property of recycled PEEK/CF materials were as nearly equal to that of virgin material. (2) FCP curves on a da/dN-ΔK diagram for three materials were expressed as one curved line on a da/dN-ΔK/E diagram. Therefore, it could be understood that there FCP curves were influenced by the elasticity modulus on fatigue crack propagation, the crack opening displacement (COP). (3) Above da/dN=10-7 [m/cycle] on FCP curves, the'm'values of Paris's law for virgin material was smaller than that for recycled materials. This was because the bridging effect of virgin material was superior to that of recycled materials.
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