Analytical models of composite material drilling
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Drilling of composite material structures is widely used for aeronautical assemblies. When drilling, damage to the composite laminate is directly related to the cutter geometry and the cutting conditions. Delamination of the composite materials at the hole exit as directly related to the axial force (F Z) of the cutter is considered to be the major such defect. To address this issue, an orthotropic analytical model is developed in order to calculate the critical force of delamination during drilling and a number of hypotheses for loading are proposed. This critical axial load is related to the delamination conditions (propagation of cracks in the last layers) and the mechanical characteristics of the composite material machined. A numerical model is also drawn up to allow for numerical validation of the analytical approach. A comparison between these analytical and numerical modellings and experimental results from quasi-static punch tests led to the choice of the loading hypothesis closest to the experimental conditions. The selection of corresponding load permits to model the drilling critical thrust force on delamination and then to optimise the cutting conditions. The dimensions and geometrical shape of the cutter are of considerable importance when it comes to choosing this load. The present article focuses on the case of the twist drill, which is commonly used to drill thick plates. However, this work can be adapted to different cutter geometries.
KeywordsDrilling Composite materials Delamination Analytical models Numerical models
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- 2.Hocheng H, Tsao CC (2005) The path towards delamination-free drilling of composite materials. J mater process technol 167(2-3):251–264, 30 August 2005Google Scholar
- 4.Rahmé P, Landon Y, Lachaud F, Piquet R, Lagarrigue P (2008) Study into causes of damage to carbon epoxy composite material during the drilling process. Int J Mach Mach Mater 3(3/4):309–325Google Scholar
- 11.Piquet R (1999) Thesis: Contribution à l’étude des réparations provisoires structurales aéronautiques. Etude du drilling de plaques minces en carbone/époxy. Thèse du Laboratoire de génie mécanique de Toulouse Université Paul Sabatier N°3339.Google Scholar
- 13.Timoshenko S, Woinowsky-Krieger S (1961) Theory of plates and shells. Librairie Polytechnique CH, BérangerGoogle Scholar
- 14.Furet B, Jolivel B, Le Borgne D (2005) Milling and drilling of composite materials for the aeronautics. JEC Composites 18:41–44Google Scholar
- 15.Gouleau S, Garnier S, Furet B (2006) Faisabilité du drilling d’empilages multi matériaux de type aluminium/composites. 4ème assises Machines et Usinage à Grande Vitesse. SYMAP – ENSAM, Aix en ProvenceGoogle Scholar
- 18.Rahmé P, Landon Y, Lagarrigue P, Piquet R, Lachaud F, Marguet B, Bourriquet J, Le Roy C (2009) Chisel edge effect on delamination when drilling thick composite materials with a twist drill. SAE Int J Aerosp 1:776–781, April 2009Google Scholar