The effect of temperature on fatigue strength of poly(ether‐imide)/multiwalled carbon nanotube/carbon fibers composites for aeronautical application

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.

The influence of carbon nanotube buckypaper/poly (ether imide) mats on the thermal properties of poly (ether imide) and poly (aryl ether ketone)/carbon fiber laminates

“…The incorporation of nanoparticles dispersed in polymeric matrices is not a new concept since several researchers have already carried out studies in this area of knowledge [6][7][8]85]. Among the available nanoparticles to be employed in nanocomposite are the carbon nanotubes (CNT), which consist of a perfect graphene sheet rolled into a cylinder, formed by a fullerene structure hexagonal and pentagonal faces.…”

Reconsolidation effect on impact, compression after impact and thermal properties of poly (aryl ether ketone) composites for aeronautical applications

“…Such thermoplastic matrices stand out in applications that require high temperatures, since they have high thermal stability and higher service temperatures (some high-performance thermoplastic polymers can operate up to 250°C) when compared to thermosets. 9–12…”

“…Such thermoplastic matrices stand out in applications that require high temperatures, since they have high thermal stability and higher service temperatures (some high-performance thermoplastic polymers can operate up to 250°C) when compared to thermosets. [9][10][11][12] The PAEK matrix used in this work is characterized by high stability at high temperatures and high mechanical resistance, whose chemical structure is composed of ketone (R-C=O-R) and ether (R-O-R) groups, with the aryl group responsible for the R bond between the functional groups. This polymer presents a glass transition temperature of approximately 157°C and a melting temperature of 305°C, however, the ratio and sequence of ether and ketone groups affects the melting and glass transition temperature, heat resistance and processing temperature.…”