Vibration of five-layered sandwich beam with foam/GOAM cores and fiber-reinforced polymer composite face sheet/intermediate layers
Mohammadbagher Zahirian, Mehdi Mohammadimehr, Mobin Pourvaghar
Abstract
This work employs shape functions and the finite element technique (FEM) to analyze the vibrations of a five-layer sandwich beam based on the Reddy beam theory. Foam/Graphene origami auxetic metamaterial (GOAM) cores (third layer) and carbon/glass fibers are evaluated and contrasted with carbon nanotube (CNT)/carbon nanorod (CNR) reinforced polymer face sheets (first and fifth layers), and bamboo-fiber reinforced polylactic acid (PLA) polymer composites (second and fourth layers) in this study. The effect of temperature on these layers is also investigated to learn how the material behaves under different thermal settings. This study shows that a GOAM core may be used instead of the foam core to significantly increase the sandwich beam’s vibrations. This significant improvement in vibration characteristics is attributed to the better mechanical quality of the GOAM core compared to foam, resulting in greater stiffness and less vibrational deformation. The results impact the design of lightweight and vibration-resistant structures such as automobile, airplanes, and spacecraft. Different materials have studied in this research, and the results show that changes in the layer’s material significantly increase the free vibrations. For instance, using CNT layers from a volume fraction of 0.5% to 1% results in a 9.52% increase in free vibrations, while CNR layers from a volume fraction of 0.5% to 1% increase vibrations by 10.61%. Moreover, the natural frequency is increased by 37% from the volume percentage of 0 to 0.5 when glass fibers are used, and the vibrations are increased by 58.4% when carbon fiber is used. Moreover, by employing bamboo fibers, the natural frequency increases from 0 to 0.5 volume fraction, a 3% increase. Also, the bending mode shapes of a sandwich Reddy beam have plotted. These results pay to attention to the substantial impact of material choice on the structure’s vibration behavior and provide insightful information for improving composite sandwich beam design.