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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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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