PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3491–35 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000

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XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Identification of the Weakest Metallurgical Zone on Fracture Behavior of an Undermatched Welded Joint W.Rekik* a ,O.Ancelet a , C.Gardin b a CEA Saclay DEN/DANS/DM2S/SEMT/LISN, 91191 Gif sur Yvette, France b INSTITUT Pprime, CNRS-ENSMA F-86961 Futuroscope-Chasseneuil Cedex, France In the particular case of welded structures, the tearing resistance is strongly dependent on the mismatch of welded joint. In this context, the fracture behavior of an undermatched electron beam (EB) welded joint on thick plate of aluminum alloy 6061-T6 used for structural components of experimental nuclear reactors was investigated through experimental and numerical approaches. The local constitutive behavior of the various zones of the welded joint is characterized by means of a new measurement prototype and the corresponding Hollomon parameters are determined. Toughness tests are then carried out on Compact Tension specimens for different configurations of initial crack. The transferability of the identified fracture toughness at initiation of each metallurgical zone is studied through J1c tests on Single Edge Notched Tension specimens. For a reliable interpretation of toughness tests, Finit Element analysis is performed to account or the multimaterial effect n t considered in a standard analysis. From hese experimental and numerical results, a contrast in t sile and fracture behavior is highlig ted which makes difficult the identification of the weakest metallurgical zone of the welded joint on fracture behavior. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Electron Beam welded joint, toughness test, CT and SENT, Finite Element analysis 1. Introduction Aluminum alloys are commonly used for structural engineering applications which require sometimes the use of high thick components. In order to fulfill these requirements, a recent concern has been raised about the weldability 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Identification of the Weakest Metallurgical Zone on Fracture Behavior of an Undermatched Welded Joint W.Rekik* a ,O.Ancelet a , C.Gardin b a CEA Saclay DEN/DANS/DM2S/SEMT/LISN, 91191 Gif sur Yvette, France b INSTITUT Pprime, C RS-ENSMA F-86961 Futuroscope-Chasseneuil Cedex, France Abstract In the particular case of welded structures, the tearing resistance is strongly dependent on the mismatch of welded joint. In this context, the fr cture behavior of an und rmatch d electron beam (EB) welded joint on thick plate of aluminum all y 6061-T6 used for structural components of experimental nuclear reactors was invest gated through experimental and numerical approache . The local constitu ive behavior of the various zones of the welded joint is characterized by means of a new measurement prot type a d the corresponding Hollomon param ters are det rmined. Toughness t sts are then carried out on Compact Tension specimens for different configurations of initial crack. The transferability of the id n ified fracture toughness at initiation of each m tallurgical zon is studied through J1c ests on Single Edge Notched Tension sp cimens. For a reliable terpretation of toughness tests, Fi ite Elem nt analysis is perfor d to account for the multimaterial effect not consid d in a standard analysis. From thes experimental and numerical e ults, a cont st in tensile and racture b havior is highlight d which m kes ifficult the id ntification of the weakest etallurgical zone of th weld d joint on fracture behavior. © 2016 The Au ors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: Electron Beam welded joint, toughness test, CT and SENT, Finite Element analysis 1. Introduction Aluminum alloys are commonly us d for structural ngineering applicatio s which require sometimes the use of high thick comp nents. In order to f lfill the e req irements, a recent concer has been raised about th weldability Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND licen e (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract

* Corresponding author. Tel.: +33785800026 E-mail address: Wissal.rekik@cea.fr * Corresponding author. Tel.: +33785800026 E-mail address: Wissal.r kik@cea.fr

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the Scientific Committee of ECF21.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.435