PSI - Issue 7

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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 7 (2017) 149–157 Structural Integrity Procedia 00 (2017) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 ScienceDirect

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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. Copyright © 2017 The Authors. Published by Elsevi r B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposiu on Fatigue D sign and Material Defects. Influence of build orientation on static and axial fatigue properties of maraging st l specimens produced by additive manufacturing G. Meneghetti a,* *, D. Rigon a , D. Cozzi b , W. Waldhauser b , M. Dabalà a a Department of Industrial Engineering, University of Padova, via Venezia, 1 – 35131 Padova (Italy) b Joanneum Research Forschungsgesellschaft mbH, Institute for Surface Technologies and Photonics, Niklasdorf Leobner Straße, 94 A-8712 Niklasdorf, (Austria) Abstract Additive manufacturing involves a layer-by-layer build-up of mechanical parts and it is a manufacturing technology that can be adopted with different engineering metal materials like steels, aluminium and titanium alloys. Aim of the present investigation is to analyse the influence of the build orientation on static and axial fatigue properties of maraging steel specimens manufactured by Direct Metal Laser Sintering (DMLS) of EOS metal powders. After manufacturing, some of the specimens were subjected to age hardening heat treatment (490 °C for 6 hours, followed by air cooling). Both heat treated and as-manufactured specimens have been built at 0° as well as at 90° orientation with respect to the specimen’s axis. Analyses of the crack initiation point are perfo med in order to i vestigate the fatigu failure mechanisms. Finally, the fatigue stren th of the additively manufactured sp cimens was compared with that exhibited y vacuum melte specimens of th s me steel r ported in literature. © 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: Additive manufacturing; Maraging steel; Axial fatigue 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy In luenc of build orientation on static and axial fatigue prope ties of maraging steel specimens produced by additive manufacturing G. Meneghetti a,* *, D. Rigon a , D. Cozzi b , W. Waldhauser b , M. Dabalà a a Department of Industrial Engineering, University of Padova, via Venezia, 1 – 35131 Padova (Italy) b Joanneum Research Forschungsgesellschaft mbH, Institute for Surface Technologies and Photonics, Niklasdorf Leobner Straße, 94 A-8712 Niklasdorf, (Austria) Abstract Additive manufacturing involves a layer-by-layer build-up of mechanical parts and it is a m nufacturing technology that an be adopted with different engineering metal materials like steels, aluminium d titanium alloys. Aim of the present investigation is to analys the influence of the build orientation on static an axi l fatigue properties of maraging steel specimens manufactured by Dir ct Metal Laser Sintering (DMLS) of EOS metal powders. After manufacturing, some of the sp cimens were subjected to age hardeni g heat treatm nt (490 °C for 6 hours, followed by ai cooling). Both heat treated and s-manufactured specimens have b en built at 0° as well as t 90° ori ntation with respect o the specim n’s xis. Analyses of the crack initia on point ar performed in ord r to investigat the fatigu failure mechanisms. Finally, the fatigue strength of the additively m nufactur specimens was compared with that exhibited by vacuum melted specimens of the same steel re orte in liter ture. © 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 D fects. Keywords: Additive manufacturing; Maraging steel; Axial fatigue 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy

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

* Corresponding author. Tel.: +39-0498276751. E-mail address: giovanni.meneghetti@unipd.it * Corresponding author. Tel.: +39-0498276751. E-mail address: giovanni.meneghetti@unipd.it

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.: +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.2017.11.072

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