Papers by Author: S. Rajesh

Abstract: Silicon Carbide/GFRP reinforced matrix composite and SiC matrix composite has been developed by using hand layup and resin casting methods respectively. The GFRP reinforced polymer composite is made by sandwiching two layers of GFRP in between the SiC material. The resin used for the preparation the samples are epoxy and polyester, for both Sic/GFRP composite and SiC composite. An Arcan fixture with butterfly specimen is used to measure the fracture occurring in various modes of the polymer composite. The objective of the proposed testing method is to determine the variation in the stress value depending on the resin material as well as the influence of GFRP in the strength of SiC polymer composite. Results from the tests are analyzed to show that the polyester resin is better for shear strength, in both Sic/GFRP reinforced and SiC composite material.

Abstract: Now-a-days natural Fibers are employed in various engineering applications because of their high tensile strength, low thermal expansion, high strength to weight ratio and good corrosion resistance. In this paper, woven roving composite laminates are prepared to produce automotive panel boards. Even though, various methods are available for preparing composites like Pultrusion method, filament winding method and hand layup method, hand lay method is used in this paper. The bundles of woven roving are alkalized at concentration between 1.2 and 6% of NaoH. Then, the treated fibres with increased strength are used as reinforcement with Epoxy LY556 resin with HY951 hardener under room temperature. The tensile analysis is conducted for the specimens like plain specimen, specimen with circular central hole and specimen with rectangular central hole. The results show that plain specimen is having more strength followed by circular hole and then rectangular hole specimens. It suggested that the case industry can make near optimal circular hole for its components by replacing rectangular hole.