Construction of Environmental Sound Design System for Energy Machines Produced of Advanced reinforced Plastic Used at Elevated Temperature : Influence of Environmental Temperature on fatigue Crack Propagation Property of Recycled Fiber Reinforced Plastic

This study was done to clarify the influence of complex deterioration on fatigue reliability of thermal plastic in order to construct environmentally sound design system for energy machines. Especially, the influence of recycling process and high environmental temperature on fatigue crack propagation property of fiber-reinforced PA46 were experimentally examined. Main results were as follows ; (1) FCP property was declined remarkably by complex deterioration between elevated temrerature above Tg and recycling process. (2) From fractography using SEM, it could be understood that fibers were easy to pulled out because the matrix resin became ductile due to declining the dynamic elasticity at elevated temperature above Tg. (3) The interfacial bonding between matrix and fibers in specimens were become worse by recycling process and environmental temperature above Tg. Therefor it could be interpreted that the decline of FCP property was caused by the interfacial separation between matrix and fibers.