PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 1149–1155 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 intrinsic and artificial defects on the VHCF properties of 17-4PH stainless steel B.M. Schönbauer 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 a d Technology, Fukuoka University,8-19-1 Nanakuma, Jonan-ku, Fuku ka 814-0 80, Japan In the present work, fatigue test results in the very high cycle fatigue (VHCF) regime are discussed. Experiments were performed with smooth specimens in which crack initiation mostly originated at non-metallic inclusions. Additionally, the influence of small a tificial defect, i.e. circumferential notches, drilled holes and corrosion pits, was investigated. Fatigue tests in the VHCF regime were conducted using ultrasonic fatigue testing technique. Further experiments in the high cycle fatigue regime were performed using rotating bending and se vo-hydrauli testing machines. For smooth specimens, fatigue fracture was observed even at m re than 10 10 number of cycles. In contrast, no fatigue failure occurred above approximately 10 7 cycles in the presence of artificial defects, i.e., a pronounced fatigue limit was determined. Furthermore, it was found that the fatigue limit is not only depending on the defect size but also on the notch root radius of a defect. Consequently, different approaches were used to predict the fatigue limit in the presence of different defects. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: 17-4PH stainless steel; Very high cycle fatigue; Fatigue limit; Small defects 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Influence of intrinsic and artificial defects on the VHCF properties of 17-4PH stainless steel B.M. Schönbauer 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 In the present work, fatigue test results in the very high cycle fatigue (VHCF) regime are discussed. Experiments were performed wit smooth specimens in which crack initiation mostl originat d at non-metallic inclusions. Additionally, th influence of small artificial defect, i.e. circumferential otches, drilled holes nd corrosion pits, was investigate . Fatigue tests in the VHCF regime were condu ed using ultrason c fatigu testing technique. Further ex eriments in the high cycle fatigue regime were p rformed using rota ing be ding and servo-hydraulic testing machines. For smooth pecim ns, fatigue fr ctur was observed ven at more than 10 10 number of cyc es. In contrast, no fati ue failure occurr d abov approximately 10 7 cycles in the presen e f ar ficial def cts, i.e., a pr nounced fatigue limit was det rmine . Furthermore, it was found that th fatigue limit is not only depend ng on the defect size b t als on th notch root radius of a defect. C nsequently, different approaches were u ed to pre ict the fatigue limit in the pr sence of different defects. © 2016 The A thors. Published by Elsevier B.V. Peer-review under esponsibility of the Scientific Committee of ECF21. Keywords: 17-4PH stainless steel; Very high cycle fatigue; Fatigue limit; Small defects 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

1. Introduction

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Precipitation-hardened chromium-nickel-copper stainless steel 17-4PH possesses high strength, toughness and good corrosion resistance. Therefore, it is widely used in applications where good corrosion resistance as well as high strength are required, e.g. in the aerospace, chemical, food processing, paper and power industry. Precipitation-hardened chromium-nickel-copper stainless steel 17-4PH possesses high strength, toughness and good rrosio resista ce. Therefore, t is widely u ed in applications where good corrosion resistance as well as high strength are required, e.g. in the aero pace, chemical, food proces ing, paper and power i du try.

* 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. * Corresponding author. Tel.: +43-1-47654-5169; fax: +43-1-47654-5159. E-mail address: bernd.schoenbauer@boku.ac.at 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +43-1-47654-5169; fax: +43-1-47654-5159. E-mail address: bernd.schoenbauer@boku.ac.at

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.2016.06.147