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Fiber metal laminates (FMLs) based on unidirectional glass fabric and aluminum alloy 7075-T6 sheet bonded with 5052 epoxy, were prepared by vacuum molding followed by hand layup method. Interface of metal-adhesive was improved by a series of surface treatments of aluminum sheets, which increased the surface roughness (Ra) of aluminum from 227 to 1067 nm.Matrix was modified by incorporation of graphene nanosheets (GNs) and nanodiamonds (NDs). In-order to optimize the quantity of nanoreinforcements three different proportions were used, that is, 0.5, 1, and 1.5 wt %, inclusive of equal proportions of GNs and NDs. For comparison, pristine epoxy based FMLs were also fabricated. Synergetic effect of GNs and NDs improved the tensile strength by 25%, inter laminar shear strength (ILSS) 46%, and fracture toughness 70%, by combination of GNs and NDs up to 0.5 wt%.Surface roughness test and water drop contact angle test were performed to evaluate the surface roughness of aluminum, while the microscopic analysis was conducted to observe the fracture behavior of FMLs. Finite element method (FEM) for numerical validation of experimental results was also performed. From the results, it was concluded that combination of aluminum surface treatment and matrix modification improved the overall performance of FMLs.

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