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.
In order to have a better idea of the interaction of the defect centres produced by y-irradiation with dislocation in the processes of deformation destruction, mechanoluminescence (ML) and thermoluminescence (TL) of gamma-irradiated CaSO4:Dy, these phosphors have been investigated. CaSO4:Dy phosphors were prepared by dissolving CaSO4.2H2O in sulphuric acid and evaporating the excess acid around 300 degrees C. ML was excited impulsively by dropping a load on to the sample. Two peaks have been observed in the ML intensity against time curve. The total light output, i.e. integrated ML intensity, increases with concentration of dopant, strain rate and with irradiation doses. The TL glow curves of CaSO4:Dy phosphors at different concentrations of dopant and irradiation doses were also recorded. Studies of the influence of post-irradiation annealing on the ML of CaSO4:Dy show that with the removal of the TL dosemetric peak (approximately 210 degrees C) the ML intensity decreases markedly. A spectroscopic study of ML and TL has also been carried out to elucidate the mechanism of ML. Correlation between ML and TL has also been found.
Metasurfaces have the ability to control classical and non‐classical states of light to achieve controlled emission even at the level of a single emitter. Here, the Kerker condition induced emission rate enhancement with strong directivity is unveiled from a single emitter integrated within a dielectric metasurface consisting of silicon nano‐disks. The simulation and analytical calculations attest the Kerker condition with unidirectional light scattering evolved by the constructive interference between electric dipole, toroidal dipole, and the magnetic quadrupole. The results evince spatially‐dependent enhanced local density of optical states, which reciprocates localized field intensity. The emission rate enhancement of 400 times is achieved close to the zero phonon line of the nitrogen‐vacancy center with superior emission directivity and collection efficiency. The results have implications in on‐demand single photon generation, spin‐photon interface, many‐body interactions, and strong coupling.
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