Mechanical Properties of Carbon Fiber Reinforced Thermoplastic Matrix Composites

摘要

Carbon fiber reinforced thermoplastic (CFRTP) composites have a great potential for use in aircraft structures especially where toughness is concerned. In this study, experiments are conducted on a fabric-CFRTP and fabric CFRP composites subjected to the effect of elevated temperature on short beam shear strength and flexural fatigue strength. Composites were fabricated from carbon fiber 8-harness satin fabric reinforced with two thermoplastic matrices, polyethersulphon (PES) and polyetheretherketon (PEEK) and compared with those of an epoxy matrix system. The CFTRP laminates were prepared by the film stacking method, namely thermoplastic resin films and carbon fiber fabric were stacked alternately then consolidated into a laminate by heat and pressure. Short beam shear tests were performed under environmental conditions at temperatures of 25 to 180 C. Flexural fatigue tests were performed at a room temperature of 25 C and elevated temperatures of 80 to 90 and 130 to 140 C. Short beam shear strength under elevated temperature conditions for fabric-CFRTP is comparable to that obtained with most fabric-CFRP. The fatigue failure specimens indicated that the tough thermoplastic matrix system shows an improved fatigue behavior compared to the brittle epoxy matrix system, mainly due to resistance to the initiation and growth of fatigue damage related to the matrix.