IOSR Journal of Engineering (IOSRJEN) www.iosrjen.org ISSN (e): 2250-3021, ISSN (p): 2278-8719 Vol. 04, Issue 03 (March. 2014), ||V6|| PP 36-41 International organization of Scientific Research 36 | P a g e Experimental Investigation of Mechanical Behavior of Glass- Fiber Reinforced Polyurethane ResinComposite in three Different ratios Sureshkumar.P, Karthick.B, Dinakaran.S, R.Rajapradeepan PG Student, Department of Mechanical Engineering, Sri Krishna College of Engineering and Technology, Coimbatore-641008, Tamil Nadu, India. Abstract:In this experimental study, the glass fiber reinforced polyurethane composite is prepared and the Tensile, Flexural and Impact Strengths are analyzed.Currently the glass fiber is manufactured with other resins such as epoxy, vinylester and polypropylene. These composites are used as sports goods, automobile bodies, etc. Comparing to other resin the price of polyurethane resin is one third only. The glass fiber reinforced polyurethane composite laminates was prepared by hand layup method and it was placed on the matched plate mold for curing. The composites were manufactured at various ratios such as 30:70, 35:65, and 40:60 (Fiber: Resin). The specimen is prepared from composite laminates andthe mechanical properties such as tensile strength, flexural strength and impact strength has been analyzed as per the ASTM standard D3039, D790 and D256 respectively. The results show the best suitable fiber resin ratio with respect to strength. Keywords-Composite laminate, Hand layup method, match plate mould, ASTM standard I INTRODUCTION Glass fibers are the most common of all reinforcing fibers for polymeric matrix composites (PMC). The principal advantages of glass fibers are low cost, high tensile strength, high chemical resistance and excellent insulating properties. The two types of glass fibers commonly used in the fiber reinforced plastics industry are E-glass and S-glass. Another type known as C-glass is used in chemical applications requiring greater corrosion resistance to acids than is provided by E-glass. E-glass has the lowest cost of all commercially available reinforcing fibers, which is the reason for its wide used in the FRP industry. S-glass, originally developed for aircraft components and missile casings, has the highest tensile strength among all fibers in use. However, the compositional difference and the higher manufacturing cost make it more expensive than E-glass. A lower cost version of S-glass called S-2 glass is also available. Although S-2 glass is manufactured with less-stringent non military specifications, its tensile strength and modulus are similar to those S-glasses. Glass fibers are available in the form of continuous strand roving, chopped strands and woven roving. Woven cloth is wired using twisted continuous strands called yarns. The form of woven roving is suitable for hand layup moulding. The average tensile strength of glass fiber may exceed 3.45N/mm2. The tensile strength of glass fiber may reduce due to surface damage and presence of water. The major structural applications for fiber reinforced composite are in the field of automobile components and sporting goods. In automobile applications it is classified in to three groups they are body components, chassis components and engine components. Exterior body components such as hood, door panels require high stiffness and dent resistance as well as Class-A surface finish for appearance. The composite material used for these components is E-glass fiber reinforced sheet moulding compound composite. Other body components are roof frames, door frame, bumper beams, engine valve covers, timing chain covers, oil pan etc., Unileaf E-glass fiber-reinforced epoxy springs have been used to replace multi leaf steel springs with as much as 80% weight reduction. Other structural chassis components such as drive shaft and road wheels have been successfully in the laboratory and further research is going onto regularize for common use. In sporting goods application the glass fibers reinforced epoxy is prepared over wood and aluminium in pole vault poles because of its high strain energy storage capacity. A good pole must have a reasonably high stiffness and high elastic limit stress so that the strain energy of the bent pole can be recovered to propel the athlete above the horizontal bar.Other glass fiber sporting goods are surf boards, archery bows and arrows.