Analytical models of composite material drilling

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...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2011-02, Vol.52 (5-8), p.609-617
Main Authors: Rahmé, Pierre, Landon, Yann, Lachaud, Frédéric, Piquet, Robert, Lagarrigue, Pierre
Format: Article
Language:English
Subjects:
Aeronautics
Axial forces
Axial loads
CAE) and Design
Composite materials
Computer-Aided Engineering (CAD
Crack propagation
Cutting parameters
Delamination
Drilling
Engineering
Engineering Sciences
Fracture mechanics
Industrial and Production Engineering
Laminates
Mathematical analysis
Mathematical models
Mechanical Engineering
Mechanical properties
Mechanics
Media Management
Original Article
Thick plates
Thrust
Twist drills
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Summary: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.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-010-2773-5