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Journal of Materials Processing Technology 140 (2003) 335339Comprehensive analysis of delamination in drillingof composite materials with various drill bitsH. Hocheng , C.C. TsaoDepartment of Power Mechanical Engineering, National Tsing-Hua University, Hsinchu 300, Taiwan, ROCAbstractBeside the twist drill, the effects of various drill geometries were rarely discussed in analytical fashion. This study presents a comprehensive analysis of delamination in use of various drill types, such as saw drill, candle stick drill, core drill and step drill. In this analysis,the critical thrust force at the onset of delamination is predicted and compared with the twist drill. 2003 Elsevier B.V. All rights reserved.Keywords: Delamination; Drilling; Saw drill; Candle stick drill; Core drill; Sep drill1. IntroductionComposite materials possess peculiar characteristics thatgovern behavior during machining. Drilling is the most frequently employed operation of secondary machining forfiber-reinforced materials owing to the need for structurejoining. Twist drills are widely used in industry to produceholes rapidly and economically. In fact, the chisel edge ofthe drill point pushes aside the material at the center as itpenetrates into the hole. Various drills have been used forneat drilling of composite materials, such as saw drill, candle stick drill and core drill etc.The delamination damage caused by the tool thrust hasbeen recognized as one of the major problem

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