Study on the Drilling of Titanium/Graphite Hybrid Composites

[+] Author and Article Information
D. Kim

School of Engineering and Computer Science, Washington State University Vancouver, Vancouver, WA 98686kimd@vancouver.wsu.edu

M. Ramulu

Department of Mechanical Engineering, University of Washington, Seattle, WA 98195ramulum@u.washington.edu

J. Eng. Mater. Technol 129(3), 390-396 (Mar 30, 2007) (7 pages) doi:10.1115/1.2744397 History: Received March 03, 2006; Revised March 30, 2007

Titanium/graphite hybrid composites (TiGr) are a potentially enabling technology which satisfies the low structural weight fraction and long operational lifetime required for the high-speed civil transport. TiGr composites are made of thermoplastic polymer matrix composite plies with titanium foils as the outer plies. The two materials are assembled by bonding the polymer matrix composite plies and titanium foils to form a hybrid composite laminate. Both experimental and analytical work has been performed to characterize major hole quality parameters and cutting mechanisms encountered in drilling of TiGr composites. The effects of consolidation processing, such as induction heating press and autoclave processes, on drilling characteristics of TiGr composites were examined. The hole quality parameters and hole exit damage was investigated and discussed.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

The schematics of composite consolidation methods

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Figure 2

Sectioned view of TiGr composite (autoclaved)

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Figure 3

Schematic drilling experimental setup

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Figure 4

Effect of speed and feed on drilling forces for autoclaved TiGr composites

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Figure 5

Effect of speed and feed on drilling forces for induction heat pressed TiGr composites

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Figure 6

Specific cutting energy (J∕mm3) of TiGr composites

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Figure 7

Some of characteristic errors occurring in drilling TiGr composites

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Figure 8

Effect of the cutting feed on the hole size error of the drilled hole for various speeds in drilling of TiGr composites

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Figure 9

Scanning electron micrograph of PMC plies on the autoclaved and induction heated TiGr composites

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Figure 10

Effect of the cutting feed and speed on the exit titanium burr heights of the drilled TiGr composite holes

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Figure 11

Bottom view of drilled holes for TiGr composites (drilling speed: 5440rpm)

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Figure 12

Tearing in induction heated TiGr composites (the hole was drilled at 0.3mm∕rev and 3500rpm)

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Figure 13

Cutting force profiles with Ti plate tearing and without tearing (no tearing: using cyrogenic treated drill at 0.25mm∕rev and 2230rpm, tearing: using conventional drill at 0.25mm∕rev and 2230rpm)




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