PSI - Issue 7

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ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Scie ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 7 (2017) 492–496 Structural Integrity Procedia 00 (2017) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 ScienceDirect

www.elsevier.com/locate/procedia

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. Copyright © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy Influence of small defects on the uniaxial and torsional fatigue strength of 17-4PH stainless steel B.M. Schönbauer a, *, H. Mayer a , K. Yanase b,c , M. Endo b,c a Institute of Physics and Materials Science, University of Natural Resources and Life Sciences (BOKU) Peter-Jordan-Str. 82, 1190 Vienna, Austria b Department of Mechanical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan c Institute of Materials Science and Technology, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan Abstract The influences of small defects on the fatigue properties of 17-4PH stainless steel under uniaxial and torsional loading are investigated. Experiments were performed with different testing techniques (rotating bending, servohydraulic and ultrasonic fatigue testing) in the high cycle and very high cycle fatigue regime. Fatigue limits under cyclic torsional loading, τ a , and cyclic axial loading, σ a , were determined. The ratio of τ a / σ a for smooth specimens is in good accordance with the von Mises criterion. This ratio increases in the presence of defects and becomes close to 1 for defects with √ area larger than 80 µm. The experimental data are evaluated to determine a predictive approach for the fatigue strength under uniaxi l and torsional fatigue loadings. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. Keywords: 17-4PH stainless steel; small defects; multiaxial fatigue, very high cycle fatigue; non-propagating cracks; fatigue limit 1. Introduction High-strength metallic materials are usually sensitiv t small defects that locally give rise to stress concentration. Therefore, the risk of failure due to small surface defects such as scratches, machined flaws, insufficient surface finishes, punc marks and environmentally-induced surface flaws (e.g., corrosion pits) is a matter of concern. The 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy Influenc of small defects on the uni xial and torsional fatigue strength of 17-4PH stainless steel B.M. Schönbauer a, *, H. Mayer a , K. Yanase b,c , M. Endo b,c a Institute of Physics a d Materials Science, iversity of Natur l Resources and Life Sciences (BOKU) Peter-Jordan-Str. 82, 1190 Vienna, Austria b Department of Mechanical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan c Institute of Materials S ience a d Technology, Fukuoka University, 8-19-1 N nakuma, J nan-ku, Fuku ka 814-0 80, Japan Abstract The influences of small defe ts on th fati ue properties of 17-4PH stainless steel under uniaxial and torsional loading are investig ted. Experiments were performed with different testing t hniques (rotating bending, servohydraulic and ultrasonic fatigue testing) in the high cycle and very high cycle fatigue regime. Fatigu limits under cyclic torsional loading, τ a , and cyclic axi l loading, σ a , were determin d. The ratio of τ a / σ a f r smooth sp cimens is in good accordance with the von Mises riterion. Thi rat o increases in the pr sence of defects an becomes close t 1 for defects with √ area la er than 80 µm. The experim tal data a e evaluated t determine a predictive approach for the fatigue streng under uniaxial and t rsional fatigue loadings. © 2017 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the Scientific Committee of th 3rd International Symposium on Fatigue Design and Material D fects. Keywords: 17-4PH stainless steel; small defects; multiaxial fatigue, very high cycle fatigue; non-propagating cracks; fatigue limit 1. Introduction High-strength metallic materials are usually sensitive to small defects that locally give rise to stress concentration. Therefore, the risk of failure due to small surface defects such as scratches, machined flaws, insufficient surface finishes, punch marks and environmentally-induced surface flaws (e.g., corrosion pits) is a matter of concern. The © 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. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. * Corresponding author. Tel.: +43-1-47654-89216; fax: +43-1-47654-89209. E-mail address: bernd.schoenbauer@boku.ac.at * Corresponding author. Tel.: +43-1-47654-89216; fax: +43-1-47654-89209. E-mail address: bernd.schoenbauer@boku.ac.at

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 10.1016/j.prostr.2017.11.117

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