Delamination-Free Drilling of Composite Laminates

[+] Author and Article Information
S. Jain

United Technologies Research Center, East Hartford, CT 06108

D. C. H. Yang

Mechanical, Aerospace and Nuclear Engineering Department, University of California, Los Angeles, Los Angeles, CA 90024

J. Eng. Ind 116(4), 475-481 (Nov 01, 1994) (7 pages) doi:10.1115/1.2902131 History: Received November 01, 1992; Revised December 01, 1993; Online April 08, 2008


Composite laminates in significant numbers are rendered unacceptable due to delamination that occurs during the drilling operation. Thrust generated during the drilling operation is identified as responsible for delamination. Expressions developed for critical thrusts and critical feed rates, by modeling the delamination zone as an elliptical plate in unidirectional laminates, appear to be fairly accurate. It has been demonstrated that the critical thrusts and feed rates obtained for unidirectional laminates can be conservatively used for multi-directional laminates. With regard to the tool geometry, the chisel edge width appears to be the single most important factor contributing to the thrust force and hence delamination. A diamond-impregnated tubular drill tool was designed and tested. This tool resulted in a much smaller thrust and much better hole quality as compared with the standard twist drills.

Copyright © 1994 by The American Society of Mechanical Engineers
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