Chisel Edge Effect on Delamination when Drilling Thick Composite Materials with a Twist Drill

Document Number: 2008-01-2301

Date Published: September 2008

Author(s):
Pierre Rahme - Student Choice High School

Abstract:
The drilling process is currently applied for bolt or rivet assembly of composite structures. As for metallic structures, the twist drill is the most commonly used cutter. At the hole exit, some delamination is generated with the use of a conventional twist drill. In this paper, an analytical model to calculate the critical thrust force in drilling composite materials is developed. This model relates the drilling critical thrust force to the delamination conditions (opening of cracks). It takes into account the chisel edge effect and the principal cutting edge effect of the twist drill. A close correlation between the experiment and the presented analytical model results is obtained. Finally, this study can be used to minimize drilling delamination at hole exit.

File Size: 497K
Product Status: In Stock

Included in: V117-2008

See other papers presented at Aerospace Manufacturing and Automated Fastening Conference & Exhibition, September 2008, North Charleston, SC, USA, Session: Advanced Composite Fabrication and Joining Processes (Part 3 of 3)

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