International Journal of Innovative Technology and Exploring Engineering (IJITEE) ISSN: 2278-3075, Volume-8 Issue-10, August 2019 1724 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number J90480881019/2019©BEIESP DOI: 10.35940/ijitee.J9048.0881019 Abstract: Sisal fiber reinforced composites are being replaced with manmade composites as these materials are difficult to manufacture and non biodegradable. On the other hand, the natural fiber reinforced composites such as sisal fiber reinforced composites shows less strength compared to manmade composites. The objective of the present work is to explore the mechanical properties of sisal fiber composites and hybrid sisal composites using analytical and experimental methods. The sisal composites and hybrid sisal composites are prepared by using hand layup techniques. The hybrid composites are prepared by reinforcing nano carbon powder and sisal fibers in a polymer matrix with the weight fraction of 9% of carbon powder and 50% of sisal fiber. The elastic modulus of polymer matrix with carbon powder reinforcement and polymer matrix, carbon powder and sisal fiber reinforced composites are identified by conducting suitable experiments. Later by using the finite element method, the fracture behavior of sisal fiber composites and hybrid composites are estimated. The energy released (ER) and energy required to create the surface (ES) are estimated to identify the critical crack length of the respective material. The present work is used for the design of sisal fiber composites with respect to young’s modulus and fracture response. Index Terms: Sisal fiber composites, Young’s modulus, Fracture behavior, crack length. I. INTRODUCTION Researchers in early 80’s have made considerable efforts to replace the metals with polymers which are having high strength to weight ratio and low density also. From space applications to household products, polymers have been used intensively[1]. The polymers are having advantages along with the disadvantages like disposal problem. Use of the polymers is also causing environmental pollution; it can be reduced by replacing the polymers with the biodegradable polymers. Researchers are interested in the development of the natural reinforced fibers to replace the synthetic fiber reinforced composites. For example, glass fiber causes threat to the environment and health problems to people working on it. Revised Manuscript Received on August 05, 2019 A.Eswar, Department of Mechanical Engineering, Assistant Professor, K. L. Deemed to be University, Vaddeswaram, A.P., India K.Venkata Rao, Department of Mechanical Engineering, Assistant Professor, Prasad V. Potluri Siddhartha Institute of Technology, Kanuru, Vijayawada, A.P, India. Snigdha Surapaneni, Prasad V. Potluri Siddhartha Institute of Technology, Kanuru, Vijayawada, A.P, India. Dr. P.Phani Prasanthi, Prasad V. Potluri Siddhartha Institute of Technology, Kanuru, Vijayawada, A.P, India. Dr. M. Mounika, Prasad V. Potluri Siddhartha Institute of Technology, Kanuru, Vijayawada, A.P, India. Abdul Khalil, Alwani [2] has shown the wide range of natural fiber application and also mentioned that fibers like bamboo fiber has prominent potential in composite making due to its high strength to weight ration and environmentally friendly nature. The combination of Sisal fiber with the epoxy as matrix has been used by various researchers. C. McCarthy et al found that the stress concentration at the tip of the transverse crack results in delamination at the boundaries of the ply and results in redistribution of the stress to nearby plies, causing earlier failure through fibre fracture and affects the composite on the ‘laminate level’.[3] Qian Li et al reported that using the experimental applied stress as reference, the double-interface model provide a more accurate quantitative theoretical prediction of the interfacial failure behavior of PFRCs during multi-stage fracture of the two interfaces.[4] Z. Khan et al reported that the Bamboo fiber reinforced epoxy composite of fiber length of 25mm are having more fracture toughness (KIC) value than the composites having smaller fiber lengths. Matrix cracking, fiber pull out, fiber breakage and fiber matrix debonding are the main causes of failures [5]. According to Shane Johnson et al, two new macro and one micromechanical models are developed to characterize the nonlinear orthotropic behavior of the composite in the transverse, axial and shear directions.[6].Several researchers developed hybrid composites by chemically modifying fibers chemically or by making use of the coupling agents to improve the fiber-matrix interface in composites .Mustafa Abu Ghalia et al, determined the influence of fracture toughness and compressive response of natural and synthetic fiber-reinforced composites.[7]M K Guptaa& R K Srivastava studied that the Mechanical, thermal, water absorption properties and dynamic mechanical analysis of sisal fiber composites and also found that the glass transition temperature value obtained from loss modulus curve is lower than that tan delta curve.[8]Quim Tarresa et al, reported that the henequen fibers have a high cellulose content that results in the strong interfaces in addition of coupling agent to the composite formulation.[9] According to the report by Arain Muhammad Fahad et al, the interfacial behavior was studied making use of the single fiber pull-out tests and tensile test was carried out to analyze Fracture Behavior of Nano Particle Reinforced Sisal Fiber Composites using Analytical and Experimental Methods Snigdha Surapaneni, P.Phani Prasanthi, M. Mounika, A.Eswar, K.Venkata Rao