PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3057–3064 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 Influence of the Casting P ocess in High Temperature Fatigue of A319 Aluminium Alloy Investigated By In-Situ X- Ray Tomography and Digital Volume Correlation Nora Dahdah a , *, Nathalie Limodin a , Ahmed El Bartali a , Jean-François Witz a , Rian Seghir a , Eric Charkaluk a , Jean-Yves Buffiere b a Laboratoire de Mécanique de Lille (LML), FRE CNRS 3723; Ecole Centrale de Lille, 59651 Villeneuve d’Ascq cedex, France b Laboratoire Matériaux, Ingénierie et Sciences (MATEIS), INSA-Lyon, CNRS UMR 5510; Villeurbanne, 69621, France Abstract In order to satisfy the economic constraints together with environmental requirements, the automotive industry has been forced to adopt a strategy of down-sizing, which has led into process modification of some engine parts like cylinder heads. Nowadays, the Lost Foam Casting process (LFC) replaces the conventional Die Casting (DC) process ue to cost reduction and geom try optimization goals. Ho ever, aluminum alloy automotive parts produced by the LFC process have a coarser microstructure an mor po osity defects than parts produced with conventional casting processes at faster cooling rates. In the c linder heads produced by the LFC process, the microstructu e consists of ard intermetallic phases and large gas and microshrinkage por s. In order to study the influence of this complex 3D microstructure on fatigue crack initiation and propagation, a experiment l protocol using laboratory, synchrotron tomogr phy, SEM images and 3D Digital Volume Correlation (DVC) has been used. Fatigue t sts performed at temperatures characteristics of in-service conditions (250°C) revealed the initiation of 3D cracks at large pores and a propagation along the hard inclusions around the main pore that drove to failure but also in other areas of the specimen gauge length. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Influence of the Casting Process in High Temperature Fatigue of A319 Aluminium Alloy Investigated By In-Situ X- Ray Tomography and Digital Volume Correlation Nora Dahdah a , *, Nathalie Limodin a , Ahmed El Bartali a , Jean-François Witz a , Rian Seghir a , Eric Charkaluk a , Jean-Yves Buffiere b a Labora oire de é anique de L ll (LML), FRE CNRS 3723; Ecole Centrale de Lille, 59651 Villeneuve d’A cq cedex, France b Laboratoire Matériaux, Ingénierie et Sciences (MATEIS), INSA-Lyo , CNRS UMR 5510; Villeurbanne, 69621, France Abstract In order to satisfy the economic constraints together with environmental requirements, the automotive industry has been forced to ad pt a strategy of down-sizing, which ha led into process modification of some gine p rts like cyli er heads. Nowadays, the Lost Foam Casting process (LFC) repl ces the conventional D e Casting (DC) process due to cost reduction and geometry optimization goals. However, aluminum alloy automotive parts produced by the LFC process have a coarser microstructure and more porosity defects than parts produced with conventional casting pro sses at faster cooling rates. In the cylinder heads produc by the LFC process, the mic o truct r consists of hard intermetallic pha e nd large gas and micros rinkage por s. In or er to study the influ nce of this complex 3D micro ructure on fatigu cra k initiation and propagation, an exp imental protoc l using labora ory, synchrotron tomography, SEM images and 3D Digit l Volume Correl tion (DVC) has b en used. Fatigue tests performed at temper tures charac eristics of in-service conditions (250°C) rev aled the initiation of 3D crack at large pores and a ropagation along the hard inclusions around the main pore that drove to failur but also in other reas of the specimen gauge length. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: Aluminum-silicon alloys, High Temperature, Digital Volume Correlation, synchrotron X-ray tomography 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. © 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. Keywords: Aluminum-silicon alloys, High Temperature, Digital Volume Correlation, synchrotron X-ray tomography

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +33-(0)6-95-24-66-25; fax: +33-(0)3-20-33-53-93 E-mail address: nora.dahdah@ec-lille.fr 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +33-(0)6-95-24-66-25; fax: +33-(0)3-20-33-53-93 E-mail address: nora.dahdah@ec-lille.fr

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.2016.06.382