G. Ramachandra Reddy

Chemical Resistance and Tensile Properties of Short Bamboo Fiber Reinforced Epoxy Composites

Short bamboo fiber reinforced epoxy composites have been developed with varying fiber length. The chemical resistance tests indicate that the composite materials are resistant to acetic acid, hydrochloric acid, nitric acid, sodium hydroxide, sodium carbonate, ammonia, benzene, carbon tetrachloride and toluene. The variation of tensile load at break with fiber length has been studied and the tensile load is found to be maximum for the fiber length of 30 mm.

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.

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.

Flexural and Compressive Properties of Bamboo and Glass Fiber Reinforced Epoxy Hybrid Composites

The flexural, compressive properties of bamboo/glass fiber-reinforced epoxy hybrid composites were studied. The effect of alkali treatment of the bamboo fibers on these properties was also studied. It was observed that both flexural and compressive properties of the hybrid composite increase with glass fiber content. These properties were found to be higher when alkali-treated bamboo fibers were used in the hybrid composites. The elimination of amorphous hemi-cellulose with alkali treatment leading to higher crystallinity of the bamboo fibers with alkali treatment may be responsible for these observations.The flexural, compressive properties of bamboo/glass fiber-reinforced epoxy hybrid composites were studied. The effect of alkali treatment of the bamboo fibers on these properties was also studied....

Void Content, Density and Weight Reduction Studies on Short Bamboo Fiber–Epoxy Composites

Short bamboo fiber reinforced epoxy composites were developed with varying fiber content. The void content, density, and weight reduction of these composites were determined. The void content of these composites was found to be decreasing with increasing fiber content. The density of these composites was found to be decreasing with fiber content. The percentage weight reduction of these composites from the matrix was found to be increasing linearly. The bamboo fibers, and the epoxy resin system constituted lighter composites.

Chemical Resistance and Tensile Properties of Glass and Bamboo Fibers Reinforced Polyester Hybrid Composites

The chemical resistance of the glass/bamboo fibers reinforced polyester composites to acetic acid, sodium hydroxide, ammonium hydroxide, sodium carbonates, benzene, toluene, carbon tetrachloride, and water was studied. The hybrid fiber composites showed better resistance to these chemicals. Besides this, the tensile properties of glass/bamboo fibers reinforced polyester hybrid composites were studied. The effect of alkali treatment of the bamboo fibers on these properties was also studied. It was observed that tensile properties of the hybrid composites increased with glass fiber content. These properties were found to be higher when alkali treated bamboo fibers were used in the hybrid composites. The elimination of amorphous hemi-cellulose with alkali treatment leading to higher crystallinity of the bamboo fibers may be responsible for these observations.The chemical resistance of the glass/bamboo fibers reinforced polyester composites to acetic acid, sodium hydroxide, ammonium hydroxide, sodium carbonates, benzene, toluene, carbon tetrachloride, and water was studied. The hybrid fiber composites showed better resistance to these chemicals. Besides this, the tensile properties of glass/bamboo fibers reinforced polyester hybrid composites were studied. The effect of alkali treatment of the bamboo fibers on these properties was also studied. It was observed that tensile properties of the hybrid composites increased with glass fiber content. These properties were found to be higher when alkali treated bamboo fibers were used in the hybrid composites. The elimination of amorphous hemi-cellulose with alkali treatment leading to higher crystallinity of the bamboo fibers may be responsible for these observations.

Tensile properties of sun hemp, banana and sisal fiber reinforced polyester composites

Experiments are conducted to find out the tensile properties of short sun hemp, banana, and sisal fiber reinforced composites. Length of these natural fibers and fiber weight are varied and are impregnated in polyester resin to prepare tensile test specimen. Optimum values of fiber length and fiber weight ratios are found through experimental results. Analysis is done on these results.

Mechanical characterization of hybrid composites: A review

Although natural fiber-based composite materials attract with their special features like low specific weight, biodegradability and easy processing, these fibers in combination with artificial fibers show interesting properties and are suitable for certain engineering applications. Such engineered biocomposites are needed to meet the needs of users of construction and commodity products which will simultaneously maximize the sustainability of natural resources. Various researchers researched to develop and characterize such materials. This paper throws a light on recent trends, developments, advancements and applications of hybrid composite materials.

Effect of Fiber Length and Fiber Weight Ratio on Tensile Properties of Sun hemp and Palmyra Fiber Reinforced Polyester Composites

Short sun hemp and palmyra fiber reinforced polyester composites are developed using varied fiber lengths and weight ratio. The variation of tensile load at break with varied fiber length and varied weight ratios has been studied. The optimum length of fiber and optimum weight ratios of respective fibers are found in this experimental study.

Thermogravimetric analysis of Dendrocalamus strictus bamboo fibers

The primary thermogram of the bamboo fibers of Dendrocalamus strictus family was recorded. Using the primary thermogram and its derivative, the initial degradation, inflection point and final degradation were determined. The refractoriness and integral procedural degradation temperatures were also determined. These studies revealed the suitability of bamboo fibers as reinforcement even with thermoplastic polyolefin matrix materials.