The mechanical properties and dry sliding wear behaviour of glass fabric reinforced epoxy (G-E) composite with varying weight percentage of silicon dioxide (SiO 2 ) filler have been studied in the present work. The influence of sliding distance, velocity, and applied normal load on dry sliding wear behaviour has been considered using Taguchi's L 9 orthogonal array. Addition of SiO 2 increased the density, hardness, flexural, and impact strengths of G-E composite. Results of dry sliding wear tests showed increasing wear volume with increase in sliding distance, load, and sliding velocity for G-E and SiO 2 filled G-E composites. Taguchi's results indicate that the sliding distance played a significant role followed by applied load, sliding velocity, and SiO 2 loading. Scanning electron micrographs of the worn surfaces of composite samples at different test parameters show smooth surface, microploughing, and fine grooves under low load and velocity. However, severe damage of matrix with debonding and fiber breakage was seen at high load and velocity especially in unfilled G-E composite.
The present paper studies water absorption behavior and its consequence on mechanical properties of untreated and chemically treated Sansevieria/carbon fiber reinforced hybrid epoxy (Sria/CF-Ep) composite with calcium carbonate (CaCO 3) nanoparticles. Sansevieria/carbon fiber (30/5 wt%) reinforced hybrid epoxy composite with 1.5, 3 and 4.5 wt% of CaCO 3 have been developed by hand lay-up method followed by heat press. The water absorption characteristics of the Sria fibers were obtained by immersing the composite samples in sea water at room temperature, until reaching their water content saturation level. The dry and water-immersed hybrid composite samples were subjected to hardness, interlaminar shear, tensile, flexural, and impact tests. The water absorption development of hybrid composites was found to follow Fickian diffusion behavior. Diffusion coefficients and maximum water uptake results were evaluated; the outcome showed that both increased with an increase in filler loading to study the consequence of water penetration in the fiber/matrix interface. The study shows that the mechanical and water-resistant properties of the Sria were improved through chemical treatment and hybridization. Nevertheless, as a result of water penetrating the fiber/matrix interface, longer water-immersion times reduced the tensile and flexural strength of the composites.
The work presents the mechanical investigation of composite materials that are meant to perform under different temperature condition with the application of tensile loading. The composite under study is developed using reinforcement materials made out of basalt and S-glass fiber reinforced with polymer matrix composite (epoxy resin) by hand layup technique with different compositions by changing the fiber layer sequence starting with pure form to hybrid once (fiber architecture). The test results reveals, that the tensile properties of the hybrid composites with fiber architecture of 2/2 basalt mixed S-glass fiber reinforced with epoxy composites are at its optimal level in both normal and elevated temperature conditions. Basalt fiber being good temperature resistant and S-glass fiber having high strength, with this hybrid combination, the material has out played under tensile force being applied when compared with other samples under test.
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