PSI - Issue 2_A

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 2643–2649 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 Characterization of Casting Pores in Fe-rich Al-Si-Cu Alloys by Microtomography and Finite Element Analysis M.Wicke*, M. Luetje, I. Bacaicoa, A. Brueckner-Foit Institute for Materials Engineering, University of Kassel, Moenchebergstrasse 3, D-34109 Kassel, Germany Abstract An accurate methodology has been developed to identify local stress concentration on the contour of casting pores in high Fe content Al-Si-Cu alloys. It relies on the 3D reconstruction of the pore morphology by micro-computed tomography (μ-CT), which was converted into a 3D volumetric model to be used as an input for linear finite element analysis (FEA) with the aim of investigating the structural influence of these defect. In combination with an appropriate visualization of the results, this treatment allowed localizing highly stressed regions. Results indicate that particularly holes in the shape of shrinkage pores act as stress concentrators and can thus be identified as hot spots. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Al-Si-Cu alloys; X-ray tomography; Porosity, Finite element analysis 1. Introduction Th excellent combinati n f mecha ical a d technolo cal properties of Al-Si casting alloys have enabled this alloy system to be used for a wide range of structural components. Unfortunately, due the increased use of recycled grade Al-Si alloys as the base material, the usage for high-performance applications is limited, in particular where fatigue reliability is of importance. As iron is easily picked up in the course of the recycling process and hence inevitably present in Al-Si alloys, coarse Fe-rich intermetallic compounds can be formed, including the long-needle like ß-Al 5 FeSi phase [Puncreobutr et al. (2014), Yi et al. (2004)]. These ß-intermetallics are reported to affect not only 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Characterization of Casting Pores in Fe-rich Al-Si-Cu Alloys by Microtomography and Finite Element Analysis M.Wicke*, M. Luetje, I. Bacaicoa, A. Brueckner-Foit Institute for Materials Engineering, University of Kassel, Moenchebergstrasse 3, D-34109 Kassel, Germany Abstract An accurate methodology has been developed to identify local stress concentration on the contour of casting pores in high Fe co tent Al-Si-Cu all ys. It relies o the 3D reconstruction of the pore morphology by micro-computed tomography (μ-CT), which was converted into a 3D volumetric model t be used as an input f linear finite element analysis (FEA) with the aim of investigating the structural infl ence of thes defect. In combinat on with an appropr ate visualiz tion of the results, t is tre t ent allowed localizing highly stress d regions. Results i dicate th particul rly holes n the shape of shrinkag pores act as str ss concentr tors and can t us be id ntified a hot pot . © 2016 The Authors. Publishe by Elsevier B.V. Peer- eview under resp ns bility of the Scientific Committee of ECF21. Keywords: Al-Si-Cu alloys; X-ray tomography; Porosity, Finit elem nt analysis 1. Introduction The excellent combination of mechanical a d technological properties of Al-Si casting alloys have enabled this alloy system to be used for a wide range of structur l components. Un ortunately, due the increased us of recycled grade Al-Si alloys a the b se material, the usage for high-performa ce applications is limited, in particular wh re fatigue reliabi it is of importance. As iron i easily p cked up in the course of the recycling process and henc inevitably present n Al-Si alloys, coar e Fe-r ch intermetallic compounds can be ormed, in luding th long-ne dle like ß-A 5 FeSi phase [Puncreobutr et l. (2014), Y et al. (2004)]. These ß-interm tallics are reported to affect not only 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.

* Corresponding author. Tel.: +49 5618043656 E-mail address: marcel.wicke@uni-kassel.de * Corresponding author. Tel.: +49 5618043656 E-mail address: marcel.wicke@uni-kassel.de

* 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.2016.06.330