Severe damages may occur during the drilling of carbon fiber reinforced plastics (CFRP). In practice, this damage is limited by adding a backup support to the drilled parts. For some aeronautical parts with curvatures, backing up parts is a demanding process. In order to simplify the operation, this research studies the effect of using a configurable setup to support parts on the resulting quality of drilled holes. The test coupons referenced in this study are twenty four-plies unidirectional laminates made of carbon fibers and epoxy resin. Different signals were measured during the drilling process for these laminates, including the thrust force, the displacement and the acceleration. The processing of these signals demonstrated that the damage is due to the combination of two main factors: the spring-back of the thin part and the thrust force. The results found were confirmed for different feeds and speeds. When the distance between supports is increased, it is observed that the spring-back increases but the thrust force decreases. The study proves the feasibility of unsupported drilling of thin CFRP laminates without creating any observable damage.<\/p>\r\n","references":"[1] C. C. Tsao et H. Hocheng, \u201cEffects of exit back-up on delamination in\r\ndrilling composite materials using a saw drill and a core drill\u201d,\r\nInternational Journal of Machine Tools & Manufacture, vol.45,\r\nP.1261\u20131270, 2005.\r\n[2] W. Koenig, P. Gra\u00df, \u201cQuality definitions and assessment in drilling of\r\nfibre reinforced thermosets\u201d, Annals of the CIRP, vol. 38, pp.119\u2013124,\r\n1989.\r\n[3] A. B. Sadat, W.S. Chan, and B.P. Wang, \u201cDelamination of\r\ngraphite\/epoxy laminate during drilling operation\u201d, Journal of Energy\r\nResources Technology, Transactions of the ASME, vol. 114, no. 2: pp.\r\n139-141, 1992.\r\n[4] R. Teti, \u201cMachining of composite materials\u201d, CIRP Annals -\r\nManufacturing Technology, vol. 51, no. 2, pp. 611-634, 2002.\r\n[5] F. Lachaud, R. Piquet, F. Collombet and L. Surcin. \u201cDrilling of\r\ncomposite structures\u201d, Composite Structures, vol. 52, pp.511-516, 2001.\r\n[6] C. K. H Dharan, M. S. Won, \u201cMachining parameters for an intelligent\r\nmachining system for composite laminates\u201d, International Journal of\r\nMachine Tools & Manufacture, vol. 40, no. 3, pp. 415-26, 2000.\r\n[7] H. Hocheng and C. K. H. Dharan, \u201cDelamination during drilling in\r\ncomposite laminates\u201d. Journal of engineering for industry, vol. 112,\r\npp.236-239, 1990\r\n[8] J-F. Chatelain J-F, I. Zaghbani, \u201cA Comparison of Special Helical Cutter\r\nGeometries Based on Cutting Forces for the Trimming of CFRP\r\nLaminates\u201d, NAUN International Journal of Mechanics, vol. 6, no. 1, pp.\r\n52-59, 2012.\r\n[9] H. Hamedanianpour, J-F. Chatelain, \u201cEffect of Tool Wear on Quality of\r\nCarbon Fiber Reinforced Polymer Laminate during Edge Trimming\u201d,\r\nAdvanced MaterialsResearch Journal, to be published, 2013.\r\n[10] H. Hocheng, C. C. Tsao, \u201cComprehensive analysis of delamination in\r\ndrilling of composite materials with various drill bits\u201d, Journal of\r\nMaterials Processing Technology, vol. 140, no. 1-3, pp. 335-339, 2003.\r\n[11] H. Hocheng, C. C. Tsao, \u201cThe path towards delamination-free drilling of\r\ncomposite materials\u201d, Journal of Materials Processing Technology, vol.\r\n167, no. 2-3, pp. 251-264, 2005.\r\n[12] S. Gouleau, S. Garnier, B. Furet, \u201cPer\u00e7age d\u2019empilages multimat\u00e9riaux\u201d,\r\nM\u00e9canique et Industries, vol. 8, no. 5, pp. 463-469, 2007.\r\n[13] C. Murphy, G. Byrne, M. D. Gilchrist, \u201cThe performance of coated\r\ntungsten carbide drills when machining carbon fibre-reinforced epoxy\r\ncomposite materials\u201d, Proc. of the Institution of Mechanical Engineers,\r\nPart B: Journal of Engineering Manufacture, vol. 216, no. 2, pp. 143-\r\n152, 2002.\r\n[14] Tsao, W.-C. Chen, \u201cPrediction of the location of delamination in the\r\ndrilling of composite laminates\u201d, Journal of. Materials. Processing.\r\nTechnology vol. 70, pp. 185\u2013189, 1997.\r\n[15] G. DiPaolo, S.G. Kapoor, R.E. DeVor, \u201cAn experimental investigation of\r\nthe crack growth phenomenon for drilling of fibre-reinforced composite\r\nmaterials\u201d, Journal of engineering for industry. Transactions of the\r\nASME, vol. 118, pp.104\u2013110, 1996.\r\n[16] E. Capello, \u201cDamping and its effect on delamination damage in drilling\r\nthin composite laminates\u201d, Journal of Materials Processing Technology,\r\nvol 148, no. 2, pp. 186\u2013195, 2004.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 81, 2013"}