“…The optimal Al 2 O 3 wt% obtained for the shear strength agreed well with that obtained by Hiremath et al. 33 They have pointed that the maximum improvement in the flexural properties (strength and modulus) of the nanocomposites was at 1.0 wt% Al 2 O 3 . Figure 8.In-plane shear strength and the improvement percentages in the nanocomposites vs. wt% of Al 2 O 3 .…”
Section: Resultssupporting
confidence: 88%
“…The maximum improvement in the impact properties at 1.0 wt% Al 2 O 3 agree well with the results of some researchers. 14,33,40 The impact force is dependent on the input energy and target stiffness. As the target stiffness increases, the impact force also increases.…”
The present work aims to improve the mechanical properties of Epocast 50-A1/946 epoxy via incorporation of alumina nanoparticles using an ultrasonic agitation method. The optimum weight percentage of alumina nanoparticles was determined based on the improvement in the shear and impact properties of the nanocomposites at room temperature and 50 ℃. Accordingly, neat epoxy panels and nanocomposite panels with 0.5, 1.0, 1.5, and 2.0 wt% alumina nanoparticles were fabricated. The shear and thermo-mechanical impact properties of the panels were measured using an instrumented drop-weight impact machine and an Iosipescu shear test fixture, respectively, according to ASTMs D5379 and D7136. The maximum improvement in shear strength and modulus was 10.9% and 8.1%, respectively, for the nanocomposites containing 1.0 and 1.5 wt% alumina nanoparticles. The predicted shear moduli of the nanocomposites agreed well with the measured values with a maximum error of 6.52%. The optimal performance of impact properties was achieved by incorporating 1.0 wt% of alumina nanoparticles. Namely, the maximum impact-bending stiffness, contact force, and absorbed energy were increased by 12.9%, 13.0%, and 23.4%, respectively. The test temperature of 50 ℃ was found to have a negative effect on the impact-bending stiffness and the maximum contact force. On the other hand, the absorbed energy was increased up to 12.1%.
“…The optimal Al 2 O 3 wt% obtained for the shear strength agreed well with that obtained by Hiremath et al. 33 They have pointed that the maximum improvement in the flexural properties (strength and modulus) of the nanocomposites was at 1.0 wt% Al 2 O 3 . Figure 8.In-plane shear strength and the improvement percentages in the nanocomposites vs. wt% of Al 2 O 3 .…”
Section: Resultssupporting
confidence: 88%
“…The maximum improvement in the impact properties at 1.0 wt% Al 2 O 3 agree well with the results of some researchers. 14,33,40 The impact force is dependent on the input energy and target stiffness. As the target stiffness increases, the impact force also increases.…”
The present work aims to improve the mechanical properties of Epocast 50-A1/946 epoxy via incorporation of alumina nanoparticles using an ultrasonic agitation method. The optimum weight percentage of alumina nanoparticles was determined based on the improvement in the shear and impact properties of the nanocomposites at room temperature and 50 ℃. Accordingly, neat epoxy panels and nanocomposite panels with 0.5, 1.0, 1.5, and 2.0 wt% alumina nanoparticles were fabricated. The shear and thermo-mechanical impact properties of the panels were measured using an instrumented drop-weight impact machine and an Iosipescu shear test fixture, respectively, according to ASTMs D5379 and D7136. The maximum improvement in shear strength and modulus was 10.9% and 8.1%, respectively, for the nanocomposites containing 1.0 and 1.5 wt% alumina nanoparticles. The predicted shear moduli of the nanocomposites agreed well with the measured values with a maximum error of 6.52%. The optimal performance of impact properties was achieved by incorporating 1.0 wt% of alumina nanoparticles. Namely, the maximum impact-bending stiffness, contact force, and absorbed energy were increased by 12.9%, 13.0%, and 23.4%, respectively. The test temperature of 50 ℃ was found to have a negative effect on the impact-bending stiffness and the maximum contact force. On the other hand, the absorbed energy was increased up to 12.1%.
“…It appeared that the cross-link density became saturated after 140 C, and optimum PCT to have maximum tensile strength for the used epoxy system was around 140 C. At higher PCT, the tensile strength decreased, which can be correlated to destroying of the cross-linked linkages. 38 Moreover, this reduction is an evidence that one or more of the composite components are modified during post curing. Campana et al 39 showed that the higher the PCT is, the lower the tensile stress is.…”
In this study, the response surface methodology was used to investigate the tensile properties of epoxy/graphene nanoplatelets/carboxylated nitrile butadiene rubber ternary nanocomposites. Box-Benhken method was used to design experiments for four factors consisting of graphene nano-platelets (at 0, 0.75, and 1.5 wt%), carboxylated nitrile butadiene rubber (0, 5, and 10 wt%), hardener contents (80, 90, and 100 phr), and also different post curing temperature (130, 140, and 150 C). After the samples were prepared, a tensile test was performed to obtain the tensile strength, tensile modulus, and elongation at break of nanocomposites. Moreover, field-emission scanning electron microscopy was used to observe the state of graphene nano-platelets dispersion. The results obtained from the tensile tests showed that increasing the graphene nano-platelets, carboxylated nitrile butadiene rubber, and hardener contents and high post curing temperature reduced the tensile strength. The optimum value of tensile modulus was achieved at low concentration of carboxylated nitrile butadiene rubber and high contents of graphene nano-platelets, whereas maximum elongation at break occurred at high content of carboxylated nitrile butadiene rubber and low concentration of graphene nano-platelets and hardener. In addition, a second-order polynomial model was used to correlate the tensile properties of ternary nanocomposites to the desired factors. Finally, contour plots were used to determine optimum values of the desired factors. It was seen that the presence of 10 wt% of carboxylated nitrile butadiene rubber in the epoxy matrix increased the elongation at break by the considerable amount of *49%.
“…Hiremath et al determined the optimum post-curing temperature for epoxy/alumina polymer nanocomposite in order to obtain better viscoelastic and flexural properties [14]. Similarly, Kumar et al determined both optimum post-curing temperature and time for interlaminar shear strength (ILSS) and the corresponding glass temperature (Tg) of glass FRP composites.…”
Abstract.Composite materials for the most part depicted as the mixes of two or more materials that outcome in the unmistakable properties than that of guard materials. Fibre strengthened plastics have been all around utilized for get-together flying machine and transport key parts as a delayed consequence of their specific mechanical and physical properties, for example, high particular quality and high particular robustness. Another pertinent application for fibre maintained polymeric composites (particularly glass fibre strengthened plastics) is in the electronic business, in which they are utilized for passing on printed wiring sheets. The utilization of polymer composite materials is winding up being powerfully essential. The present work delineates the change and mechanical portrayal of new polymer composites including glass fibre fortress, epoxy and maple cellulose fibre. The starting late made composites are delineated for their mechanical properties. The composite spreads were set up by utilizing hand layup framework. The experiments were conducted on and studied the effect of post curing on hybrid composites. The result reveals that the samples only with natural fibre have more promising results compared with synthetic fibre. The synthetic fibres get wrinkled due to post curing were as no such visuals in the natural fibres.
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