New analytical model for delamination of CFRP during drilling
Article dans une revue avec comité de lecture
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 problem and is directly related to the drill axial force, the composite material mechanicalcharacteristics and the load distribution along the cutting and chisel edges. This paper analyzes thedistribution of the load along the drill edges and points out a triangular distribution associated to anadditional 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 thrustduring drilling for different combined loadings. This new model is compared with the existing ones inthe literature and with experimental results. This analysis highlights that delamination occurs in a mixedmode and not in mode I only. The use of the B-K criterion for the determination of the equivalent criticalenergy release rate GCand a cutting edge combined loading (triangular distribution associated to anadditional load) allow a close correlation between experimental measurements and the prediction ofthis new model.
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Article dans une revue avec comité de lectureGIROT, Franck; DAU, Frédéric; GUTIERREZ-ORRANTIA, Esther (Elsevier, 2017)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 ...
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 ...