Low velocity impact behavior of twill basalt/epoxy composites modified by graphene nanoparticles

Abstract

Nanoparticles are considered as feasible strengthening agent which strengthen different types of polymeric materials with minor reduction in the density of composites. In this study, 0.1 and 0.5 wt. % Graphene Nano Platelets (GNPs) are added to the matrix of basalt fiber reinforced epoxy composites (BECs) and the effects of such addition on low velocity impact behavior are investigated. In this regard, the epoxy matrix is reinforced in macro scale by basalt fibers weaved together in 2/2 Twill pattern. Vacuum Assisted Resin Infusion Molding (VARIM) method is used to fabricate the pure and multi-scale BECs. The profile energy method is also used to evaluate the penetration and perforation threshold of fabricated pure and multi-scale BEC specimens. The force versus time and deflection, energy and deflection versus time curves are plotted and the key parameters of low velocity impact test including maximum force, energy and deflection are compared. According to the results, introducing of GNP nanoparticles in the matrix of BECs improves the low velocity impact behavior of these composites by increasing the contact force and decreasing the absorbed energy in rebounding state. Finally, based on the experiments, the 0.5 wt.% BEC has the best impact performance by applying 15.08 kN impact force against the applied forces of 13.78 kN and 11.208 kN for 0.1 wt.% and pure BECs.

The effects of graphene oxide addition on low velocity impact performance of aramid fiber reinforced epoxy composites

“…However, when the dispersion magnitude of GO is increased to 0.5 wt.%, the deflection increases to 23.33 mm. This demonstrates a decrease in the stiffness of the composite by approximately 43% due to increased agglomeration within the composite matrix 60 . During the contact of the impactor with the surface of the specimen, three states may occur 61 .…”

“…This demonstrates a decrease in the stiffness of the composite by approximately 43% due to increased agglomeration within the composite matrix. 60 During the contact of the impactor with the surface of the specimen, three states may occur. 61 In the first state, the energy of the impactor (E max ) is lower than the penetration threshold of the composite material.…”

Impact Damage Prediction of Carbon Fiber Foam Sandwich Structure Based on Hashin Failure Criterion

“…Domestic and foreign scholars had done considerable research on low-energy impact of composite foam sandwich structures. Azimpour-Shishevan F et al [5] added graphene nanosheets to the composite material, reducing rebound by increasing contact force, thereby enhancing the ability of the composite material to resist low-speed impact. Zhang Wenping et al [6] conducted a mechanical analysis of the dynamic response characteristics of a new bionic honeycomb sandwich structure under low-speed oblique impact by establishing a finite element model.…”