PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 541–548 ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com

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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 Internal and surface damage after electrochemical hydrogen charging for ultra low carbon steel with various degrees of recrystallization A. Laureys a, *, R. Petrov a,b , K. Verbeken a a Department of Materials Science and Engineering, Ghent University (UGent), Tech Lane Ghent Science Park – Campus A, Technologiepark 903, B-9052 Ghent Belgium b Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands An ultra low carbon (ULC) steel was subjected to electrochemical hydrogen charging to provoke hydrogen induced damage in the material. The damage characteristics were analyzed for recrystallized, partially recrystallized, and cold deformed material. The goal of the study is to understand the effect of c ld deformation on the hydrogen induced cracking behavior of a material which is subjected to cathodic hydrogen charging. Additionally, charging conditions, i.e. charging tim a d current density, were vari d in order to identify correlations between, o t e one hand, crack initiation and propagation, and, on the other hand, the charging conditions. The obtained hydrogen induced cracks were studied by optical mi oscopy, scanning electron microscopy (SEM) d electron backsca ter diffraction (EBSD). Hydrogen induc d cracks were observed to propagate transgranularly, indepen ently of the state of the material. Deformed samples were co siderably more sensitive to hydrogen induced c acking, which implies the important role of dislocations in hydrogen induced damage mechanisms. © 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 Internal and surface damage after electrochemical hydrogen charging for ultra low carbon steel with various degrees of recrystallization A. Laureys a, *, R. Petrov a,b , K. Verbeken a a Department of Materials Science and Engineering, Ghent University (UGent), Tech Lane Ghent Science Park – Campus A, Technologiepark 903, B-9052 Ghent, Belgium b Department of Mat rials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands Abstract An ultra low carbon (ULC) steel was subjected to electrochemical hydrogen charging to provoke hydrogen induced damage in the material. The damage characteri tics wer analyzed for recrystallized, parti lly recrystallized, an cold deforme aterial. The goal of the study is to understand the ffect of cold deformation on the hydrogen induced cracking behavi of a aterial w ich is subjected to cath dic hydrogen charging. Additionally, charging conditions, i.e. charging time and current density, were varied in ord r to identify correlations betwee , on the e hand, crack initiation and propa ation, and, on th oth r hand, th charging conditi ns. The obtained hydrogen induced cracks were studied by optical mic scopy, sc nning electr n microscopy (SEM) and el ctron backscatter diffractio (EBSD). Hydrog n induc d cracks were ob erved to propagate transgr nularly, independently of the st e f the materi . Deformed samples were conside bly mor sen itiv to hy rogen induced cracking, which implies import t role of dislocations in hydrogen induc d mag mechanism . © 2016 The Authors. Published by El evier B.V. Peer-review under esponsibility of he Scientific Committee of ECF21. Keywords: ULC steel; blisters; hydrogen induced cracking; EBSD; cold deformation 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. Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: ULC steel; blisters; hydrogen induced cracking; EBSD; cold deformation

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* 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 responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +32-9-331-0418; fax: +32-9-264-5833. E-mail address: aurelie.laureys@ugent.be * Corresponding author. Tel.: +32-9-331-0418; fax: +32-9-264-5833. E-mail address: aurelie.laureys@ugent.be

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.2016.06.070