The effect of temperature on fatigue strength of poly(ether-imide)/multiwalled carbon nanotube/carbon fibers composites for aeronautical application
Luis F.P. Santos (São Paulo State University)
Bruno Ribeiro (Universidade Federal de Sao Paulo)
Luis R.O. Hein (São Paulo State University)
Rene C. Alderliesten (TU Delft - Structural Integrity & Composites)
D. Zarouchas (TU Delft - Structural Integrity & Composites)
Edson Cocchieri Botelho (São Paulo State University)
Michelle Leali Costa (São Paulo State University)
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Abstract
This work concerns the fatigue behavior at three different temperature conditions (−40, 20, and 80°C) and the addition of multiwalled carbon nanotube (MWCNT) into a carbon-fiber reinforced poly(ether-imide) composite. The incorporation of MWCNT into the composite increased the tensile strength and Young's modulus by up 5 and 2%, respectively. At low temperature, the incorporation of the nanoparticles improved the fatigue strength of the laminates by 15%. The shear strength results obtained by interlaminar shear strength and compression shear test tests have shown an increase of about 16 and 58%, respectively, by the introduction of nanotubes into the laminates. Fractographic observations revealed that the surface of carbon nanotube laminate (PEI/MWCNT/CF) presented a ductile behavior, and differences in the fracture aspects of the material compared to the traditional PEI/CF laminate have been observed.