الفهرس | Only 14 pages are availabe for public view |
Abstract Silica, alumina and carbon nanoparticles were dispersed into epoxy resin with an ultrasonic liquid processor at 0.5, 1.5 and 3wt% content. Hardness, tensile and dynamic tests were carried out on these nanocomposites in comparison to neat epoxy. The hardness test shows that the addition of nanoparticles to epoxy resin increases the hardness over neat epoxy. The hardness and tensile strength are improved by adding 0.5wt% silica, 0.5wt% alumina and 1.5wt% carbon nanoparticles. The tensile modulus increases as the nanoparticle content increases. Further comparison of the theoretical predictions with experimental moduli show acceptable prediction models. The effect of adding nanoparticles in addition to the effect of varying moisture content on the dynamic behavior of nanocomposites was investigated. Results indicate that addition of nano powders tends to lower moisture absorption of epoxy except for the 1.5wt% and 3 wt% alumina and silica nanocomposites. Damping results show that dry silica and alumina nanocomposite have lower damping capability than dry neat epoxy at high frequencies. At half saturation, the loss factor of nanocomposites is higher than those determined under dry and saturated conditions. As the moisture reaches the saturation level the loss factor reduces. However, the damping behavior of some epoxy nanocomposites improves as a result of water absorption especially at high frequencies. |