Effects of drilling conditions, drill material, and point angle on acoustic emission and exit hole delamination in drilling advanced fiber-reinforced composites

Anthony Chukwujekwu Okafor; Scott R. Birdsong

doi:10.1117/12.339963

4 February 1999 Effects of drilling conditions, drill material, and point angle on acoustic emission and exit hole delamination in drilling advanced fiber-reinforced composites

Anthony Chukwujekwu Okafor, Scott R. Birdsong

Author Affiliations +

Proceedings Volume 3589, Process Control and Sensors for Manufacturing II; (1999) https://doi.org/10.1117/12.339963
Event: Nondestructive Evaluation Techniques for Aging Infrastructures and Manufacturing, 1999, Newport Beach, CA, United States

Abstract

A 1/3 fractional factorial design of experiment with four factors at three levels was used to investigate drilling of multi-directional AS4/PEEK composites. The design of experiment was conducted to determine the main effects and two factor interactions of drill point angle, cutting speed, feed rate, and drill material on acoustic emission generated in drilling and drilled hole exit delamination. Drill material, feedrate, cutting speed, and drill point angle were found to have statistically significant effects on total and average acoustic emission energy generated which also depends on the location of the acoustic emission spectra (on the workpiece or on the drilling fixture). Drill material was found to have the most significant effect on exit hold delamination, and accounted for over 50% of the variation in the measured exit hole delamination. Carbide drills were found to produce the least amount of exit hold delamination throughout the range of speeds investigated followed by Polycrystalline Diamond drills, while High Speed Steel Cobalt drills were found to produce holes with the greatest amount of exit hold delamination.

Citation Download Citation

Anthony Chukwujekwu Okafor and Scott R. Birdsong "Effects of drilling conditions, drill material, and point angle on acoustic emission and exit hole delamination in drilling advanced fiber-reinforced composites", Proc. SPIE 3589, Process Control and Sensors for Manufacturing II, (4 February 1999); https://doi.org/10.1117/12.339963

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available