بررسی رفتار مکانیکی و ارتعاشی تیرهای نانوکامپوزیتی تقویت‌شده با ترکیب هم‌افزایی نانولوله‌های کربنی چندجداره و اکسید گرافن کاهش‌یافته

In this study, the mechanical and vibrational behavior of epoxy nanocomposite beams reinforced with multi-walled carbon nanotubes (MWCNT) and reduced graphene oxide (rGO) was investigated in single and hybrid form. The samples were fabricated with different weight percentages of nanoparticles and tensile tests were performed to determine Young's modulus, yield stress, ultimate strength, fracture toughness and fracture strain. For theoretical analysis, the Halpin-Tsai model was used to predict the mechanical properties and the effect of aggregation and synergy of nanoparticles in the hybrid system was considered. The results showed that the addition of 0.06 wt% MWCNT and 0.6 wt% rGO at a ratio of 10:1 produced the greatest increase in Young's modulus and natural frequency of the beam. The natural frequencies of the rigid beam were calculated for the first to third modes and compared with the experimental results from Abaqus simulation. The results show that adding an optimal percentage of nanoparticles significantly improves the mechanical properties and bending stiffness of the beam, and consequently increases its natural frequencies.