New analytical model for delamination of CFRP during drilling
Article dans une revue avec comité de lecture
JournalJournal of Materials Processing Technology
Drilling of composite material structure is a widely used process in aeronautical assembly due to its best manufacturing value (ratio quality/cost). However, delamination which can be generated at the hole exit is still a problem and is directly related to the drill axial force, the composite material mechanical characteristics and the load distribution along the cutting and chisel edges. This paper analyzes the distribution of the load along the drill edges and points out a triangular distribution associated to an additional load located at the centre of the drill. This additional load depends strongly on the feed rate. An orthotropic analytical model is then proposed in order to determine the delamination critical thrust during drilling for different combined loadings. This new model is compared with the existing ones in the literature and with experimental results. This analysis highlights that delamination occurs in a mixed mode and not in mode I only. The use of the B-K criterion for the determination of the equivalent critical energy release rate GC and a cutting edge combined loading (triangular distribution associated to an additional load) allow a close correlation between experimental measurements and the prediction of this new model.
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Article dans une revue avec comité de lectureGIROT, Franck; DAU, Frédéric; GUTIERREZ-ORRANTIA, Esther (Elsevier, 2016)Drilling of composite material structure is a widely used process in aeronautical assembly due to itsbest manufacturing value (ratio quality/cost). However, delamination which can be generated at the holeexit is still a ...
Article dans une revue avec comité de lectureRENDEROS, Mario; TORREGARAY, Amaia; GUTIERREZ-ORRANTIA, Esther; SAINTIER, Nicolas; GIROT, Franck (Elsevier, 2017)The possibility to reuse the metal powder wasted in Laser Material Deposition (LMD) process has been evaluated and a simple procedure developed. LMD uses metal powder which is fed through a nozzle into the focal point of ...
Article dans une revue avec comité de lectureTCHEIN, Gnofam Jacques; JACQUIN, Dimitri; ALDANONDO, Egoitz; COUPARD, Dominique; GUTIERREZ-ORRANTIA, Esther; GIROT MATA, Franck; LACOSTE, Eric (Elsevier, 2019)Hot deformation behavior of the Ti-6Al-4V alloy is studied through hot torsion tests. Cylindrical samples are twisted at different strain rates and temperatures in the β phase domain. The recorded torque vs twisting angle ...
Article dans une revue avec comité de lectureALONSO, Unai; CALAMAZ, Madalina; GIROT, Franck; IRIONDO, Edurne (Society of Manufacturing Engineers, 2019)Hybrid stacks made of carbon reinforced plastic (CFRP) and Ti-6Al-4 V alloy (Ti) are often drilled together to reduce positional errors, enhance tight tolerances and minimize machining time. However, this is a complex task ...
Cutting Forces Parametric Model for the Dry High Speed Contour Milling of Aerospace Aluminium Alloys Article dans une revue avec comité de lectureSALGUERO, Jorge; BATISTA, Moises; CALAMAZ, Madalina; GIROT, Franck; MARCOS, Mariano (Elsevier, 2013)Cutting forces is one of the most important outputs in material removal machining processes. Their values depend on a large number of parameters, such as the cutting tool material and geometry, the workpiece material or ...