AUTHOR=Madenci Emrah , Özkılıç Yasin Onuralp , Bahrami Alireza , Hakeem Ibrahim Y. , Aksoylu Ceyhun , Asyraf Muhammad Rizal Muhammad , Beskopylny Alexey N. , Stel’makh Sergey A. , Shcherban’ Evgenii M. , Fayed Sabry TITLE=Behavior of functionally graded carbon nanotube reinforced composite sandwich beams with pultruded GFRP core under bending effect JOURNAL=Frontiers in Materials VOLUME=10 YEAR=2024 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2023.1236266 DOI=10.3389/fmats.2023.1236266 ISSN=2296-8016 ABSTRACT=

A novel generation of composite sandwich beams with laminated carbon fiber-reinforced polymer skins and pultruded glass fiber-reinforced polymer core materials was examined for their flexural behavior. The strength and failure mechanisms of the composite sandwich beams in flatwise and edgewise configurations were investigated using three-point static bending tests. These sophisticated composite structures must be designed and used in a variety of sectors, and our research provides vital insights into their performance and failure patterns. In comparison to the reference specimens (FGM-1), the carbon nanotube-reinforced specimens’ bending capacity was affected and ranged from −2.5% to 7.75%. The amount of the carbon nanotube addition had a substantial impact on the beams’ application level and load-carrying capacity. Particularly, the application of 0.5 wt% additive in the outermost fiber region of the beams, such as in FGM-4, led to an increase in the bending capacity. However, the stiffness values at the maximum load were decreased by 0.3%–18.6% compared to FGM-1, with the minimum level of the decrease in FGM-4. The experimental results were compared with the theoretical calculations based on the high-order shear deformation theory, which yielded an approximation between 11.99% and 12.98% by applying the Navier’s solution.