Abstract
On fatigue crack propagation characteristics of recycling FRTP, the recycling evaluation using infrared thermometer and thermal analysis equipment is carried out. In this paper an explanation is given why the crack tip temperature of recycled fiber reinforced thermo-plastics(FRTP) is higher than that of its virgin material,and the deteriorative mechanism fatigue crack propagation property of recycled materials is investigated by measuring their crystallinity. The main results are as follows ; (1) Recycling process causes the decrease in crystallinity of fiber-reinforced PA46 because of its matrix resin. (2) It is caused by the decrease in crystallinity in recycling process that the mechanical properties(yield strength and elastic modulus) of recycled materials are inferior to chose of virgin material. The increase in hysterics heating for recycled materials is caused by the decrease in mechanical properties. The thermal conductivity of its matrix resin is reduced by the decrease in crystallinity. Therefore the crack tip temperature of recycled materials is higher than that of virgin material. (3) Comparing with virgin material, the recycled materials have higher crack tip temperature and lower mechanical properties so that their fatigue crack propagation property is deteriorated.
