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The aim of this study was to experimentally determine the effect of silica nanoparticles (NS) on the buckling characteristics of Kevlar/epoxy fiber reinforced composite laminates. The composite samples with different weight fractions of NS particles, namely 0.0, 0.5, 1.0, 1.5 and 2.5 wt%, were prepared by vacuum assisted resin transfer molding (VARTM) and subjected to axial and lateral buckling tests. Additionally, the buckling tests were performed on the samples with different lengths (125, 150, 175, 200 and 225 mm) to analyze in more detail the influence of NS fractions on axial and lateral buckling performances. Morphology and failure mechanisms of the samples were analyzed using scanning electron microscopy images of critical regions of each sample. The results showed that the incorporation of NS particles led to higher critical buckling load values for both axial and lateral buckling. The highest critical buckling load values for both axial and lateral buckling events were observed for 1.5 wt% NS particle content in Kevlar/epoxy composite laminates. Further

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-Damping and vibration characteristics of basalt epoxy fibre-reinforced composite laminated materials have been investigated with respect to the effect of fibre orientations. Four symmetric laminates having [(0/90) 4 ] S fibre orientation angles were prepared using plain weave basalt fabrics as reinforcement. The dynamic modal analysis was performed to determine dynamic characteristics of the composite laminates. Using half power band-width method, the damping properties were deduced from vibration response envelope curve. Loss modulus, storage modulus and damping ratio of the structures were also determined. It was observed that damping and vibration characteristics of the composite samples were strongly affected by the fibre orientation of basalt/epoxy composite. The increase in angle of fibre orientation from 0˚ to 45˚ resulted in a decrease in natural frequencies and an increase in damping ratios.