Carbon fiber-reinforced polymer composites employed in practical aerospace applications are subjected to harsh temperature changes and preloads (PLs) simultaneously. Thus, it is important to analyze the mechanical behavior of carbon fiber/polyether-ketone-ketone (CF/PEKK) composites under such conditions. Therefore, this study first performed bending tests on CF/PEEK samples at room temperature (RT), 80[Formula: see text]C, and 120[Formula: see text]C. Subsequently, bending tests were performed on CF/PEEK samples preloaded with 30%, 50%, and 70% of the ultimate load for 24 h and 72 h. Finally, bending tests were conducted on CF/PEKK samples subjected to both temperature and PL variations. The results show that as temperature increased from RT to 120[Formula: see text]C, the strain values increased, but the modulus ([Formula: see text]) and strength ([Formula: see text]) decreased. As PL increased, the flexural stress, [Formula: see text], and strain ([Formula: see text]) decreased. The samples preloaded with 30% of the ultimate load at 80[Formula: see text]C had the highest [Formula: see text], [Formula: see text], and [Formula: see text] values. However, the [Formula: see text], [Formula: see text], and [Formula: see text] values at 120[Formula: see text]C were only slightly lower than those at 80[Formula: see text]C. This proves that preloaded CF/PEKK composites maintain their high strength, toughness, and plastic behavior at high temperatures, and thus, they are suitable for aerospace applications.
Because particles that accumulate without movement can lead to a deposition gradient, the formation of a stable suspension is essential for the electrophoretic dispersion (EPD) process. The hydrophobic properties of Halloysite nanotubes (HNTs) were easily dispersed in many nonpolar polymers without further deformation steps. However, the uniform dispersion of HNTs in aqueous solutions is a pre-EPD process task. The zeta potential controls the main parameters of EPD processes, such as the density of deposits, particle orientation and velocity, and repulsive interactions between particles, which determine the stability of the suspension. In this study, the solution stability range for the addition of nanoparticles was measured and the optimal dispersion range was determined. In addition, an HNT-reinforced composite material was created by determining the optimal dispersion stability range of HNT, and the impact strength and fracture mechanism of the interface were analyzed. The solution stability and dispersion were the best between pH 6.6 and 6.8, and the highest impact strength was confirmed at 0.7 wt%. The HNT confirmed the interfacial dispersion of the EPD-fibers using scanning electron microscopy and dispersive X-ray spectroscopy (SEM-EDS).
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