S. Rajesh

Experimental Investigation of Mechanical behavior of Jute-Flax Based Glass Fiber Reinforced Composite

Present technological development and innovation needs a better class of material that meets all the practical applications along with its environmental friendly nature and economical value. Hybrid natural fiber composites, a sector of natural composites meets these requirements. This paper deals with fabrication, mechanical characterization of a hybrid (Jute+Flax+GFRP) composite and also the comparison of it with the (Jute+GFRP) based composite. These composites are fabricated using hand lay-up technique. The arrangement of hybrid composite is such that a layer of vertically laid flax fiber is flanked between layers of horizontally laid jute fiber. Epoxy resin alongside with HY951 hardener is used as the binding agent throughout the layer. Glass fiber laminates are used on both sides for improving the surface finish and surface hardness. The volumetric fraction is such that one third of total volume is occupied by Jute and Flax fibers. Test results shows that the hybrid natural composite has excellent properties under tensile, flexural loading. At last failure morphology analysis is done using Scanning Electron Microscope (SEM) and the internal structure of the broken specimen is discussed.

Properties and Performance Analysis of Woven Roving Composite Laminates for Automotive Panel Board Applications

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.

Investigation on mechanical behaviour of twisted natural fiber hybrid composite fabricated by vacuum assisted compression molding technique

Nowadays, automotive, packaging and sport equipment industries are using natural fibre based composite materials as they are cheap, abundantly available and having a lot of ecological advantages. The main objective of this paper is to introduce a new concept of fibre twisting and to investigate the effect of twisting and the fibre orientation on the mechanical properties of bio degradable green composites. Here, the composites are fabricated by vacuum assisted compression molding technique in which the problems of hand lay process are eliminated. Here, two fibers namely twisted neem and twisted kenaf are sandwiched between layers of glass fibres to enhance the stiffness and strength of the laminates. Initially, the fibers are alkalized to increase the mechanical properties. The result shows that there is a significant improvement in mechanical properties of composites due to the presence of twisted fibers. It also shows the influence of fiber orientation on mechanical properties.

Fabrication and Testing of Abaca Fibre Reinforced Epoxy Composites for Automotive Applications

The natural fibre composite materials are nowadays playing a vital role in replacing the conventional and synthetic materials for industrial applications. This paper proposes a natural fiber composite made of Abaca fibre as reinforcing agent with Epoxy resin as the matrix, manufactured using Hand Lay-up method. Glass Fiber Reinforced Plastics (woven rovings) are used to improve the surface finish and impart more strength and stiffness to natural fibers. In this work, the fibers are arranged in alternative layers of abaca in horizontal and vertical orientation. The mechanical properties of the composite are determined by testing the samples for tensile and flexural strength. It is observed that the tensile strength of the composite material is dependent on the strength of the natural fiber and also on the interfacial adhesion between the reinforcement and the matrix. The composite is developed for automobile dashboard/mudguard application. It may also be extended to biomedical, electronics and sports goods manufacturing. It can also be used in marine products due to excellent resistance of abaca to salt water damage since the tensile strength when it is wet.

Evaluation of Tensile Behaviour of GFRP/SiC Polymer Reinforced Composites

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 epoxy resin is better for tensile strength, in both Sic/GFRP reinforced and SiC composite material.

Investigation of Mechanical Behaviour of Glass Fibre Based SiC Polymer Composites

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.

Common Fixed Point Theorems in Quasi-Gauge Space for Six Self Maps

The aim of this paper is to prove, mainly, a common fixed point theorem for six self mappings and its consequences under the condition of weakly compatible mappings in a Quasi-Gauge space. Keywords— common fixed point, weakly compatible mappings, Quasi-Gauge space.