S. Venkata Naidu

Frictional Coefficient, Hardness, Impact Strength, and Chemical Resistance of Reinforced Sisal-Glass Fiber Epoxy Hybrid Composites:

In this article, the epoxy-based hybrid composites were developed by combining the sisal and glass fibers into epoxy matrix. Hardness, impact strength, frictional coefficient, and chemical resistance of hybrid composites with and without alkali treatments were studied. Variation of the aforementioned mechanical properties and chemical resistance was studied with different fiber lengths such as 1, 2, and 3 cm. A 9 vol. % of the sisal and glass fibers was reinforced into the epoxy matrix. The aforementioned mechanical properties were optimally improved at 2-cm fiber length when compared with 1 and 3 cm fiber lengths. Chemical resistance was also significantly improved for all chemicals except sodium carbonates and toluene.In this article, the epoxy-based hybrid composites were developed by combining the sisal and glass fibers into epoxy matrix. Hardness, impact strength, frictional coefficient, and chemical resistance of hybrid composites with and without alkali treatments were studied. Variation of the aforementioned mechanical proper- ties and chemical resistance was studied with different fiber lengths such as 1, 2, and 3 cm. A 9 vol.% of the sisal and glass fibers was reinforced into the epoxy matrix. The aforementioned mechanical properties were optimally improved at 2-cm fiber length when compared with 1 and 3 cm fiber lengths. Chemical resistance was also significantly improved for all chemicals except sodium carbonates and toluene.

Tensile, flexural and compressive properties of sisal/silk hybrid composites

The natural fiber composites of sisal/silk unsaturated polyester based hybrid composites with different fiber lengths were prepared. Sisal—silk fiber at a ratio of 1 : 1 has been incorporated with unsaturated polyester resin with different fiber lengths such as 1, 2, and 3 cm. The variation of mechanical properties such as tensile, flexural, and compressive strengths of these composites with different fiber lengths has been studied. In the present work a hand lay-up method was used for making the composites. Sisal fibers are treated with NaOH and the effect of alkali treatment on the tensile, flexural, and compressive properties of the sisal/silk hybrid composites has also been studied. Significant improvement in tensile, flexural, and compressive strengths of the sisal/silk hybrid composites has been observed by these treatments.

Tensile, Flexural, and Compressive Properties of Coir/Silk Fiber-reinforced Hybrid Composites

The hybrid composites of coir/silk unsaturated polyester-based hybrid composites with different fiber lengths were prepared. Coir-silk fibers are taken in the ratio of 1 : 1, and these fibers are incorporated with unsaturated polyester resin with different fiber lengths like 1, 2, and 3 cm. The variation of mechanical properties such as tensile strength, flexural strength, and compressive strength of these composites with different fiber lengths has been studied. In the present work hand lay-up method was used for making the composites. Coir fibers are treated with NaOH and the effect of alkali treatment on the tensile, flexural, and compressive properties of the coir/silk hybrid composites has also been studied. Significant improvement in tensile, flexural, and compressive strengths of the coir/silk hybrid composites has been observed by these treatments.

Impact Properties of Kapok Based Unsaturated Polyester Hybrid Composites

Natural fabric-based thermoset composites are generally lower in strength performance compared to hybrid composites. However, they have the advantages of design flexibility, cost effectiveness, lack of health-hazard problems and recycling possibilities. Hybridization with some amounts of synthetic fibers makes these natural fabric composites more suitable for technical applications such as automotive interior parts. Kapok fabric is one of the important lignocellulosic plant fabrics and has been used as a reinforcement for hybridizing with glass and sisal fabrics in polyester matrix. This study focused on the performance of impact properties of kapok/ glass and kapok/sisal fabrics reinforced polyester hybrid composites. Results show that hybridization with glass fabric enhanced the performance properties. Similarly, addition of kapok fabric to sisal/ polyester composites enhanced the properties. The effect of alkali treatment of fabrics on impact strength of these composites was studied. Notched Izod impact strength of the hybrid composites exhibited great enhancement (34%). Analysis of fabric distribution in the composite and fracture surface was performed to study the breakage and fracture mechanism of the fabric. Also, we studied the thermal properties of kapok/glass and kapok/sisal fabric reinforced polyester composites.Natural fabric-based thermoset composites are generally lower in strength performance compared to hybrid composites. However, they have the advantages of design flexibility, cost effectiveness, lac...

Chemical Resistance Studies of Silk/Sisal Fiber-Reinforced Unsaturated Polyester-Based Hybrid Composites

The natural fiber environmental friendly composites of untreated and alkali treated silk-sisal unsaturated polyester-based hybrid composites were prepared by using hand lay-up technique. The fiber length was taken as 2 cm and the sisal fibers were treated with 2% NaOH. The chemical resistance of the treated and untreated silk/sisal hybrid composites to various acids, alkalis, and solvents was studied. The chemical resistance tests of these hybrid composites were performed in order to find out whether these composites can be used for manufacturing products that are resistant to chemicals.

Mechanical Properties of Coir/Glass Fiber Phenolic Resin Based Composites

Phenolic resin based coir/glass hybrid composites were developed using compression molding followed by hand lay-up technique. Mechanical properties such as tensile and flexural properties of coir based hybrid composites were investigated as a function of fiber content and fiber volume fraction. This study is focused on the mechanical performance of coir based and its hybrid composites. Results showed that tensile properties increase with increasing fiber content. Mechanical properties of composites with increased glass fiber content have high values. The effect of alkali-treatment of fibers on the mechanical properties was also studied. Significant improvement in coir based composites by alkali-treatment was observed. Overall studies indicated that the short coir/ glass fabric hybrid polyester composites are promising candidates for structural applications where high strength and stiffness is required.

Improvement of Tensile and Flexural Properties in Epoxy/Clay Nanocomposites Reinforced with Weave Glass Fiber Reel

The tensile strength, tensile modulus, flexural strength and flexural modulus properties were investigated on epoxy/clay nanocomposites to assess the influence of nanoclay. Mechanical properties were significantly increased due to an increase in clay content up to 5 wt%, and decreased with a further increase in clay content. Optimal improvement of properties was observed with increased clay content up to 5 wt%. Duo properties of the glass fiber were improved by clay addition due to the improved interface between the glass fiber and epoxy. SEM analysis was conducted on different fractured surfaces to study the mechanical behavior.

A Study on Hardness and Flexural Properties of Kapok/Sisal Composites

The natural fiber composites based on kapok/sisal and its hybrid composites with polyester as resin matrix have been prepared and tested for mechanical properties. In this paper hardness and flexural properties of kapok/sisal composites were determined with reference to the fabrics content and varying the volume ratios of fabrics. The maximum strength in the properties determined is observed for the optimum fabric loadings. The effect of alkali treatment of fabrics on polyester composites reinforced with kapok/sisal fabrics was studied. Increasing the sisal fiber content resulted in a reduction in the hardness and flexural properties. The properties were found to increase with alkali treated fabrics used in composite. The properties of kapok/polyester composites are found to be better than those of kapok/sisal polyester composites.The natural fiber composites based on kapok/sisal and its hybrid composites with polyester as resin matrix have been prepared and tested for mechanical properties. In this paper hardness and flexural properties of kapok/sisal composites were determined with reference to the fabrics content and varying the volume ratios of fabrics. The maximum strength in the properties determined is observed for the optimum fabric loadings. The effect of alkali treatment of fabrics on polyester composites reinforced with kapok/sisal fabrics was studied. Increasing the sisal fiber content resulted in a reduction in the hardness and flexural properties. The properties were found to increase with alkali treated fabrics used in composite. The properties of kapok/polyester composites are found to be better than those of kapok/sisal polyester composites.

Tensile, Flexural and Chemical Resistance Properties of Sisal Fibre Reinforced Polymer Composites: Effect of Fibre Surface Treatment

In this study, effect of fibre surface treatment on tensile, flexural and chemical resistance properties were studied for sisal fibre reinforced composites. Natural ligno cellulosic sisal fibre reinforced composites were prepared by different surface treatments by hand lay-up method. Fibre surface treatments were carried out to produce good interface between the fibre and the matrix to improve the mechanical properties. Fibre surface treatments were done by boiled the sisal fibres in different % of NaOH and treated the fibres in different % of NaOH, treated in acetic acid and methanol. Unsaturated polyester resin was used as the matrix for preparing the composites. For comparison, these properties for untreated sisal fibre reinforced composites were also studied. From the results it was observed that 18% aqueous NaOH boiled sisal fibre reinforced composites have higher tensile, flexural properties than other composites. Untreated sisal fibre composites show lower properties than treated composites. Chemical resistance properties indicate that all sisal fibre reinforced composites are resistance to all chemicals except carbon tetra chloride. The tests are carried out as per the ASTM standards.

Kapok/Glass Polyester Hybrid Composites: Tensile and Hardness Properties

The mechanical properties of short uniaxially-oriented intimately-mixed kapok/glass fabric-reinforced polyester hybrid composites were investigated with reference to the fabric content, keeping the volume ratios of kapok to glass at 1:0, 3:1, 1:1, 1:3, and 0:1. The 9 vol% of fabric for kapok/glass was optimized. Hybrid composite materials were made by hand layup technique. The mechanical properties like tensile and hardness properties of the composites were studied. Best results were obtained for composites having increased glass fabric content in kapok/glass. The effect of alkali treatment of fabrics on the mechanical properties of these kapok/glass hybrid composites has also been studied. A significant improvement was observed in tensile and hardness properties of these composites by alkali treatment. Tensile properties were found to be better in composites having volume ratios of kapok to glass at 1:3 ratios. The hybrid composites exhibited good properties compared to the single kind of fabric/polyeste...The mechanical properties of short uniaxially-oriented intimately-mixed kapok/glass fabric-reinforced polyester hybrid composites were investigated with reference to the fabric content, keeping the volume ratios of kapok to glass at 1:0, 3:1, 1:1, 1:3, and 0:1. The 9 vol% of fabric for kapok/glass was optimized. Hybrid composite materials were made by hand layup technique. The mechanical properties like tensile and hardness properties of the composites were studied. Best results were obtained for composites having increased glass fabric content in kapok/glass. The effect of alkali treatment of fabrics on the mechanical properties of these kapok/glass hybrid composites has also been studied. A significant improvement was observed in tensile and hardness properties of these composites by alkali treatment. Tensile properties were found to be better in composites having volume ratios of kapok to glass at 1:3 ratios. The hybrid composites exhibited good properties compared to the single kind of fabric/polyester composites.