Abstract
In this paper an explanation was given why the crack tip temperature of recycled fiber reinforced thermo-plastics (FRTP) was higher than that of its virgin material, and the deteriorative mechanism of fatigue crack propagation property of recycled materials was investigated by measuring their crystallinity. The main results were as follows ; (1) Recycling process causes the decrease of crystallinity of fiber-reinforced PA46 because of thermal deterioration of its matrix resin. (2) It was caused by the decreasing of crystallinity in recycling process that the mechanical properties (yield strength and elastic modulus) of recycled materials were inferior to that of virgin material. The increasing of hysteretic heating for recycled materials was caused by the decreasing of mechanical properties. And the thermal conductivity of its matrix resin was reduced by the decreasing of crystallinity. Therefore the crack tip temperature of recycled materials was 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 was deteriorated. (4) An improvement of the crystallinity of recycled FRTP directly affects its fatigue crack propagation property.
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