International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 04 | Apr -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 3053 A REVIEW ON MECHANICAL AND THERMAL PROPERTIES OF NATURAL FIBER REINFORCED HYBRID COMPOSITES Santhosh S 1 , Bhanuprakash N 2 1Mechanical Department, M.Tech student, Machine Design, SJBIT, Bengaluru, Karnataka, India 2Mechanical Department, Assistant Professor, SJBIT, Bengaluru, Karnataka India ----------------------------------------------------------------------------------------------------------------------------------------------------- Abstract – Development of the composites with natural fibers and fillers as a sustainable alternative material for some engineering applications, particularly in aerospace applications and automobile applications. Natural fibers such as jute, coir, sisal, bamboo etc. Natural fibers are renewable, cheap, biodegradable, and environment friendly materials. In this paper Hybrid composites are in the form of sisal/Sic/Glass Fiber, jute/sansevieria fiber, sisal/jute fiber, jute/bamboo fiber. The mechanical and Thermal properties are discussed here, for the hybrid composites the Epoxy resin is used as binder, by adding the Filler to the Natural fibers materials we can further improve the performance of the composites. Some of the commonly used fillers are Carbon black, Calcium Carbonate, Alumina, Magnesium Hydroxide, Bone powder, Coconut Powder, Hematite powder, Tio2, Sio2 Graphite etc. The filler used in this paper is the Silicon Carbide. Key Words; Composite material, Hybrid Composite, Sisal fiber, Jute fiber, Glass fiber, Bamboo, Silicon Carbide, Mechanical properties, Thermal properties, Epoxy. 1. INTRODUCTION A composite is a structural material that consists of two or more combined constituents that are combined at a macroscopic level and are not soluble in each other. One constituents is called reinforcing phase and the one which it is embedded is called matrix. The reinforcing phase materials may be in the form of fibers, particles or flakes. The matrix phase materials are continuous. Composites Materials are classified into Ceramic Matrix Composites (CMCs), Metal Matrix Composites (MMCs), Polymer Matrix Composites (PMCs). When the polymer resin is used as a matrix material then it is called as polymer matrix composite. Polymer composites are having properties such as low density, good thermal and electrical insulator & low cost. PMCs and MMCs are most commonly used. The polymer matrix composites consisting of polymer (e.g., epoxy, polyester) reinforced by fibers The metal Matrix composites have a metal matrix. Metals are mainly reinforced to increase or decrease the properties. The glass is the most commonly fiber used in polymer matrix composites Because of its high strength, low cost, high chemical resistance and easy available fiber. 1.1 Natural Fiber Natural fibers such as jute, coir, sisal, bamboo etc. Natural fibers are renewable, cheap, biodegradable, and environment friendly materials. Fibers from plants such as cotton, hemp, jute, sisal, pineapple, ramie, bamboo, banana, etc. as well as wood and seeds of flax are used as the reinforcement in polymer matrix composites. Their availability, low density and price as well as satisfactory mechanical properties, make them attractive reinforcement to glass, carbon and other manmade fibers. Although glass fibers possess high specific strength, their fields of application are very limited because of their inherent higher cost of production. Natural fibers such as sisal jute fibers are replacing the glass and carbon fibers due to their easy availability and cost. 1.2 Resin The resins that are used in fiber reinforced composites can also be referred to as 'polymers'. All polymers exhibit an important common property in that they are composed of long chain-like molecules consisting of many simple repeating units. Man-made polymers are generally called 'synthetic resins' or simply 'resins'. Polymers can be classified under two types, 'thermoplastic' and 'thermosetting', according to the effect of heat on their properties. There are three types of resins used in the composite material industry i.e. Epoxy Resin, Polyester resin and Vinyl ester resin. Most of industrial applications of epoxy resin react with a curing cross link agent known as a hardener. Epoxy resin.