In this paper, the effects of the adding of carbon nanotubes on quasi-static punch shear behavior of glass/epoxy laminated composites under penetration of three different indenters has been investigated experimentally. The hybrid laminate nanocomposites have 12 layers is manufactured by Hand lay-up method. Fibers have a plain-weave configuration with density of 200 g/m2, while the epoxy resin system is made of diglycidyl ether of bisphenol A resin (DGEBA), Epon 828, with Epikure F-205 as the curing agent. The multi-walled carbon nanotubes (MWCNTs) modified with hydroxide (-COOH) are dispersed into the epoxy system in a 0% and 1% ratio in weight with respect to the matrix. In order to study of influence of the nose shape, three different indenters, flat, conical and ogival, were used. Moreover, the tensile test was performed on the nanomatrix and the hybrid laminate nanocomposite samples. The tensile test indicated that the addition of nanotubes on the tensile properties of resin were seen a significant increase, but no significant changes were observed in the tensile properties of the hybrid laminate nanocomposites. Results of the quasi-static punch shear test show that the highest contact force is exhibited by flat indenter, while the highest absorbed energy is shown by conical indenter. Totally, the adding of carbon nanotubes reduces the contact force and absorbed energy.

Keywords: Nanocomposite, punch shear, Carbon nanotubes, indenter geometry and absorbed energy

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