PSI - Issue 2_A

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3226–3232 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 vailable online at .sciencedirect.co 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 Competition Between Surface Defects and Residual Stresses On Fatigue Behaviour of Shot Peened Forged Components Benjamin Gerin a,b, ,Etienne Pessard a, * , Franck Morel a , Catherine Verdu b a LAMPA, Arts et Métiers ParisTech Angers, 2 Bd du Ronceray, 49035 Angers, France b MATEIS, INSA Lyon, Université de Lyon, CNRS UMR 5510, 25 av. Capelle, F-69621 VILLEURBANNE CEDEX, France Abstract The present study focusses on analys g and modelling the influence on f tigue beh viour of the surface of a hot forged C70 connecting rod which undergoes a shot-blasting treatment. The shot-blasting heavily affects the surface and thus the fatigue properties. In addition, the forging process introduces large defects which also have an effect on the fatigue strength. So as to be able to determine which aspects of the surface integrity are the most influential in fatigue, various surface states were thoroughly characterised and then tested in high cycle fatigue in bending. The various aspects studied are the surface roughness and large defects, residual stresses, microstructure and hardness. The aim of this work is to develop a fatigue design approach that can take into account both the effect of the surface defects and that of the residual stresses on fatigue. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: High-Cy le Fatigue, Surface Defects, Kitagawa-Takahashi Diagram, Shot-Peening 1. Introduction This study is part of a French national research project, DEFISURF, involving nine partners from the metal supplier to the final user (French car maker). Its object is to study the influence of surface integrity on the fatigue behaviour of two forged components. The first is a hot-forged connecting rod and the second is a cold-forged fatigue test specimen. The project has two parts: simulation of the forging and shot-peening processes, and modelling the fatigue crack initiation and propagation in the forged surface. The current paper will focus on the fatigue aspect of the first component: a C70 pearlitic steel hot-forged connecting rod which is then shot-blasted to clean off the scale. This shot-blasting process has a very large influence on the fatigue strength of the component. In order to study a sample , ata ia, Ital titi Between Surface Defects and Residual Stresses On tigue Behaviour of Shot Peened Forged Components e ja i eri a,b, , tie e essar a, * , ra c rel a , at eri e er b a LA PA, Arts et étiers ParisTech Angers, 2 Bd du Ronceray, 49035 Angers, France b ATEIS, INSA Lyon, Université de Lyon, CNRS U R 5510, 25 av. Capelle, F-69621 VILLEURBANNE CEDEX, France Abstract The present study focusses on analysing and odelling the influence on fatigue behaviour of the surface of a hot forged 70 connecting rod hich undergoes a shot-blasting treat ent. he shot-blasting heavily affects the surface and thus the fatigue properties. In addition, the forging process introduces large defects hich also have an effect on the fatigue strength. So as to be able to deter ine hich aspects of the surface integrity are the ost influential in fatigue, various surface states ere thoroughly characterised and then tested in high cycle fatigue in bending. he various aspects studied are the surface roughness and large defects, residual stresses, icrostructure and hardness. he ai of this ork is to develop a fatigue design approach that can take into account both the effect of the surface defects and that of the residual stresses on fatigue. 2016 The uthors. Published by Elsevier . . Peer-revie under responsibility of the Scientific Co ittee of ECF21. Keywords: High-Cycle Fatigue, Surface Defects, Kitagawa-Takahashi Diagra , Shot-Peening 1. Introduction his study is part of a French national research project, FIS F, involving nine partners fro the etal supplier to the final user (French car aker). Its object is to study the influence of surface integrity on the fatigue behaviour of t o forged co ponents. he first is a hot-forged connecting rod and the second is a cold-forged fatigue test speci en. he project has t o parts: si ulation of the forging and shot-peening processes, and odelling the fatigue crack initiation and propagation in the forged surface. he current paper will focus on the fatigue aspect of the first co ponent: a 70 pearlitic steel hot-forged connecting rod hich is then shot-blasted to clean off the scale. his shot-blasting process has a very large influence on the fatigue strength of the co ponent. In order to study a sa ple 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. st r ea fere ce ract re, , - J e

* 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-revie under responsibility of the Scientific o ittee of E F21.

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.2016.06.402