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TECHNICAL PAPERS

Chisel Edge and Pilot Hole Effects in Drilling Composite Laminates

[+] Author and Article Information
M. S. Won, C. K. H. Dharan

Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720

J. Manuf. Sci. Eng 124(2), 242-247 (Apr 29, 2002) (6 pages) doi:10.1115/1.1448317 History: Received December 01, 1998; Revised June 01, 2001; Online April 29, 2002
Copyright © 2002 by ASME
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References

Wong, T. L., Wu, S. M., and Croy, G. M., 1982, “An Analysis of Delamination in Drilling Composite Materials,” Proc. of 14th SAMPE Tech. Conf., pp. 471–483.
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Koenig,  W., and Grass,  P., 1989, “Quality Definition and Assessment in Drilling of Fiber Reinforced Thermosets,” CIRP Ann., 38, No. 1, pp. 119–124.
Hocheng, H., Puw, H. Y., and Yao, K. C., 1992, “Experimental Aspects of Drilling of Some Fiber-Reinforced Plastics,” Proc. of the Machining of Composite Materials Symposium, Chicago, pp. 127–138.
Dillio, A., Paoletti, A., Tagliaferri, V., and Veniali, F., 1992, “Progress in Drilling of Composite Materials,” Proc. of the Machining of Composite Materials Symposium, Chicago, pp. 199–203.
Park,  K. Y., Choi,  J. H., and Lee,  D. G., 1995, “Delamination-Free and High Efficiency Drilling of Carbon Fiber Reinforced Plastics,” J. Compos. Mater., 29, No. 15, pp. 1988–2002.
Tagliaferri,  V., Caprino,  G., and Diterlizzi,  A., 1997, “Effect of Drilling Parameters on the Finish and Mechanical Properties of CFRP Composites,” Int. J. Mach. Tools Manuf., 30, No. 1, pp. 77–84.
Chen,  W. C., 1997, “Some Experimental Investigations in the Drilling of Carbon Fiber-Reinforced Plastic (CFRP) Composite Laminates,” Int. J. Mach. Tools Manuf., 37, No. 8, pp. 1097–1108.
Ho-Cheng,  H., and Dharan,  C. K. H., 1990, “Delamination During Drilling in Composite Laminates,” ASME J. Eng. Ind., 112, pp. 236–239.
Jain,  S., and Yang,  D. C. H., 1994, “Delamination-Free Drilling of Composite Laminates,” ASME J. Eng. Ind., 116, pp. 475–481.
Shaw,  M. C., and Oxford,  C. J., 1957, “On the Drilling of Metals: Part 2-The Torque and Thrust in Drilling,” Trans. ASME, 79, pp. 139–148.
Dharan,  C. K. H., 1978, “Fracture Mechanics of Composite Materials,” ASME J. Eng. Mater. Technol., 100, pp. 233–247.
Timoshenko, S., and Woinowsky-Krieger, S., 1959, Theory of Plates and Shells, 2nd ed., McGraw-Hill.
DiPaolo,  G., Kapoor,  S. G., and DeVor,  R. E., 1996, “An Experimental Investigation of the Crack Growth Phenomenon for Drilling of Fiber-Reinforced Composite Materials,” ASME J. Eng. Ind., 118, pp. 104–110.
Dharan, C. K. H., Tomizuka, M., Won, M. S., Ozaki, M., and Sheng, Y., 1998, “Integration of Machine Control Schemes in the Machining of Composite Materials,” 3rd Intl. Conf. on Integrated Design & Process Tech., ASME Engg. Syst. Design & Analysis Conference, Berlin, Germany, pp. 294–301.
Saghizadeh,  H., and Dharan,  C. K. H., 1986, “Delamination Fracture Toughness of Graphite and Aramid Epoxy Composites,” ASME J. Eng. Mater. Technol., 108, pp. 290–295.

Figures

Grahic Jump Location
Experimental setup for drilling tests
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Measured thrust forces compared with values calculated from Eqs. (1) and (2)
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Comparison of thrust force curves with pilot hole and without pilot hole (drill diameter=6.35 mm (0.25 in.), spindle speed=1000 rpm, feed rate=200 mm/min)
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Circular plate model for delamination analysis used in the current model
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A circular plate with a clamped boundary condition having a circular hole and distributed forces along internal edges 13
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Comparison of the critical thrust force predicted by the current model for drilling with a pilot hole and that by Hocheng-Dharan’s model for drilling without a pilot hole, for CFRP with E=41.3 GPa,GIC=232 J/m2,h=0.127 mm and v=0.3
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Determination of allowable feeds for delamination-free drilling of carbon fiber-reinforced laminates. Note that the measured thrust force data (Δ) for drilling with a pilot hole lies well below the theoretically predicted critical thrust force above which delamination is initiated.

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