Temperature Dependence of Flexural Fatigue Strength of Pitch/PAN Hybrid Unidirectional CFRP
Hiroshi MATSUI, Yasushi MIYANO, Masayuki NAKADA and Noriyuki KIUCHI
Abstract:This paper is concerned with the temperature dependence of flexural fatigue strength of pitch/PAN hybrid unidirectional CFRP laminates. The hybrid laminates were constructed by replacing few compressive surface layers of the pitch-based CFRP composites by PAN-based layers. Three point bending fatigue tests for the hybrid laminates were carried out for a temperature range from -20 to 120 which is below the glass transition temperature, 143, of matrix resin. The flexural fatigue strength for the hybrid laminates is significantly higher than that for the pitch-based laminates at all the temperatures tested. These experimental results were compared with the predicted ones obtained from the mechanical properties of pitch and PAN based unidirectional CFRP laminates. Key Words:Fiber reinforced plastics, PAN based carbon fiber, Pitch based carbon fiber, Hybrid, Flexural fatigue strength,Temperature dependence