Experimental Investigation of the Effects of Different Conditioning Temperatures on Mode-I Fracture Toughness in Intraply Hybrid Carbon/Aramid/Elium Composites

In this study, the fracture behavior of carbon/aramid intraply hybrid fiber-reinforced composites with a thermoplastic Elium matrix were examined under various conditioning temperatures using the double-cantilever beam (DCB) test. Specimens were conditioned at -50, -25, 0, +25, and +50 °C to evaluate the effect of temperature on Mode-I interlaminar fracture toughness. Compared to the reference temperature (+25 °C), the maximum force increased by 17.33% at -50 °C, while the highest fracture toughness value was obtained at +50 °C with a 10.61% improvement. The results indicate that both low and high temperature conditioning can enhance the delamination resistance of carbon/aramid/Elium composites, although the toughening mechanisms vary depending on the temperature.