Experimental and numerical analysis of step drill bit performance when drilling woven CFRPs

Experimental and numerical analysis of step drill bit performance when drilling woven CFRPs This paper focuses on the influence of the step drill bit geometry on the damage induced during drilling Carbon Fiber Reinforced Polymer materials (CFRPs). Step geometry designed with the aim of avoiding composite damage in CFRPs drilling, is compared to conventional twist configuration. Despite the reduction of thrust force and torque observed when using the step drill, the delamination was only reduced at low feed rates. A numerical model developed for the step geometry was validated with experimental data demonstrating its ability to predict thrust force and delamination for different values of feed rate and cutting speed. Numerical model allowed the development of a parametrical study. Finally, using a response surface methodology a mechanistic model and surface diagrams have been presented in order to help in the selection of optimum variables minimizing drilling induced damage. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fusion Engineering and Design Elsevier

Experimental and numerical analysis of step drill bit performance when drilling woven CFRPs

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0920-3796
eISSN
1873-7196
D.O.I.
10.1016/j.compstruct.2017.10.061
Publisher site
See Article on Publisher Site

Abstract

This paper focuses on the influence of the step drill bit geometry on the damage induced during drilling Carbon Fiber Reinforced Polymer materials (CFRPs). Step geometry designed with the aim of avoiding composite damage in CFRPs drilling, is compared to conventional twist configuration. Despite the reduction of thrust force and torque observed when using the step drill, the delamination was only reduced at low feed rates. A numerical model developed for the step geometry was validated with experimental data demonstrating its ability to predict thrust force and delamination for different values of feed rate and cutting speed. Numerical model allowed the development of a parametrical study. Finally, using a response surface methodology a mechanistic model and surface diagrams have been presented in order to help in the selection of optimum variables minimizing drilling induced damage.

Journal

Fusion Engineering and DesignElsevier

Published: Oct 1, 2018

References

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