Abstract
The complex deterioration on fatigue reliability at elevated temperature for carbon-fiber-rein-forced PEEK was examined. In particular, the influence of thermal and mechanical fatigue on the fatigue mechanism of a sharp notched specimen was focused on. The main results were as follows. (1) An S-N curve was formed as a polygonal line having a downward convex regardless of the environmental temperature and fiber content. For long fatigue life, the influence of the carbon-fiber-content on fatigue strength was more remarkable than for a short fatigue life. (2) From fractography using SEM (Scanning Electron Microscope), temperature rise and cyclic deformation measurements, it was found that the fatigue mechanism for short life (Nf<105) is thermal fatigue, while one for long life (Nf>105) is mechanical fatigue. (3) The resistant mechanism against FCP (Fatigue Crack Propagation) in thermal fatigue is the capability to convert from strain energy into thermal energy, while that of mechanical fatigue is the bridging effect of reinforced fiber.
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