IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 6, Issue 6 (May. - Jun. 2013), PP 40-52 www.iosrjournals.org www.iosrjournals.org 40 | Page Experimental and Analytical Investigation of Drilling of Sandwich Composites: A Review Patil A.A. 1 , Shende M.D. 2 1 (Department of Mechanical Engineering, SND COE YEOLA NASHIK) 2 (Department of Mechanical Engineering, SND COE YEOLA NASHIK) Abstract: A composite material is made out of a mixture or a combination of two or more distinctly differing materials which are insoluble in each other and differ in form or chemical composition. The technological and commercial interest in composite material lies in their superior properties of strength-to-weight, stiffness-to- weight, fatigue and thermal expansion compared to metals. Extensive use of composite in application such as rockets, satellites, missiles, light combat aircraft, advanced light helicopter and trainer air craft has shown that India is on par with the advanced countries in the development and use of composites in this area. Drilling is probably the most important conventional mechanical process and it is the most widely used machining operation. Prediction of cutting forces for any set of cutting parameters is essential in optimal design and manufacturing of products. It has been predicted that most of the problem associated with hole making operation, such as drilling, can be attributed to the force generated during cutting operation. Many developments and experiments are going on drilling of Sandwich composite for damage free drilling along with the quality of the hole and the effect of tool geometry and tool material. This paper aims at the comprehensive analytical and experimental investigation work done on the composites material. The conclusion of the paper discusses the development and outlines the trends for the research in this field. Keywords: Drilling, Delamination, Delamination factor, thrust force, Design of Experiment, Taguchi Analysis, ANOVA I. Introduction: Engineering materials are evolving faster and the choice is wider than ever before. Many an industry has transformed significantly over the past few decades. This is mainly because of the advancement in materials, processes, and computational capabilities. Advanced high – tech industries adopted new materials and processes; replacement of mild steel with high strength steel, lighter non – ferrous alloys, such as aluminum and magnesium alloys, plastics, and composites. Many industries developing high strength, low weight materials for wide applications such as composite materials. There are many parameters that will affect the drilling of composite material. Many researchers have done the experiments and analytical work to get the quality hole. By evaluating these experiments they provided the design function which increase the efficiency of the process and reduce the undesirable features. The feed rate and speed along with the thrust force is the most important factor which affects the delamination in drilling. Researchers provided feasible and effective methods for evaluating of drilling induced delamination factor in drilling of composite material. Present paper gives the review of the some researchers work on drilling of composite material and work on Sandwich composite material. II. Work on Drilling of CFRP Composites C. C. Tsao [1] analyzed the Taguchi method for drilling quality associates with core drill. The thrust force and surface roughness of core drill with drill parameters (grit size of diamond, thickness, feed rate and spindle speed) in drilling Carbon Fiber Reinforcement Plastic (CFRP) laminates was experimentally investigated. Composite material for drilling was fabricated using autoclave molding. A L 27 ( 3 13 ) orthogonal array and signal-to-noise (S/N) were employed to analyze the effect of drill parameters. Using Taguchi method for design of a robust experiment the interaction among factors is also investigated. For thrust force, thickness and feed rate are the most significant factors and for surface roughness, the feed rate and spindle speed are the most significant factors in drilling CFRP laminates as experimentally and analytically obtained. In general high speed and low drilling feed rate are recommended for the production of delamination free and good surface finish holes in epoxy composites.C.C. Tsao et al. [2] presented a prediction and evaluation of delamination factor of Carbon Fiber Reinforced Plastic (CFRP) in use of twist drill, candle stick drill, and saw drill. The experiment was conducted to study delamination factor under various cutting condition. They established the correlation between feed rates, spindle speed and drill diameter with induced