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CFRP drilling: Fundamental study of local feed force and consequences on hole exit damage

Article dans une revue avec comité de lecture
Author
BONNET, Cédric
POULACHON, Gerard
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
RECH, Joël
698 Laboratoire de Tribologie et Dynamique des Systèmes [LTDS]
GIRARD, Yannick
93483 EADS IW
COSTES, Jean-Philippe

URI
http://hdl.handle.net/10985/9663
DOI
10.1016/j.ijmachtools.2014.04.006
Date
2015
Journal
International Journal of Machine Tools and Manufacture

Abstract

Carbon Fiber-Reinforced by Plastic (CFRP) is now commonly used in the aircraft industry. The main challenge is to manufacture this difficult-to-cut work material, considering its quality criteria and economical aspects. Drilling is the main machining operation required for the assembly of the aircraft structure. In this paper, results are presented and discussed regarding exit delamination studied at a local scale. Because of the anisotropic properties of CFRP, the fiber cutting modes change with the composite sequence combined with the drill revolution parameters. The local feed forces generated by the cutting edge on the hole bottom may be correlated with delaminating aspects. A posttreatment method is proposed to analyze precisely these feed force and cutting torque distributions. Appropriate ply sequences are identified in order to limit the mechanical load concentration and the risk of delamination or uncut fibers

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