The effect of graphene nanoparticles on the strength of inspired sandwich panel structure under quasi-static loading

Dragonfly wings have an interesting biological composite structure and are very specialized flight organs that are well adapted for the flight behavior of each dragonfly. This paper aims to investigate the effect of graphene nanoparticles on the strength of a sandwich structure inspired by the dragonfly wing configuration under quasi-static loading. The streak structures are made of glass/epoxy layers with different percentages of graphene nanoparticles. Also, polyurethane foam was used in the central core of the vein. The crashworthiness characteristics of these structures were discussed. On the other hand, the effect of polyurethane foam on the damage rate of sandwich veins due to quasi-static loading was investigated. In order to investigate the damage in sandwich structures, pictures of the damaged surface and the cut view of the damage were taken, and the results were reported. Finally, FE-SEM analysis was used to evaluate the distribution of graphene nanoparticles in the polymer structure. The results of this study show that the presence of graphene nanoparticles in the sandwich structure resin with foam core will not have much effect on the strength of the structure if it is less than one value. On the other hand, if the amount of graphene nanoparticles in the resin of this type of structure exceeds a certain amount, it shows relatively good resistance.