Effects of Drilling Conditions, Drill Material and Point Angle on Acoustic Emission and Hole Exit Delamination in Drilling Advanced Fiber Reinforced Composites

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 depend on the location of the acoustic emission sensors (on the workpiece or on the drilling fixture). Drill material was found to have the most significant effect on exit hole 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 hole delamination throughout the range of speeds investigated followed by Polycrystalline Diamond (PCD) drills, while High Speed Steel Cobalt (HSS/Cobalt) drills were found to produce holes with the greatest amount of exit hole delamination.

Department(s)

Mechanical and Aerospace Engineering

International Standard Serial Number (ISSN)

0277-786X

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2024 Society of Photo-optical Instrumentation Engineers, All rights reserved.

Publication Date

03 Mar 1999

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