PSI - Issue 12

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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. AIAS 2018 International Conference on Stress Analysis Mechanical characterization of a new low carbon bainitic steel for high performance crankshaft Paolo Citti a , Alessandro Giorgetti a, *, Ulisse Millefanti a a Guglielmo Marconi University, Department of I novation and Information Engineering,, Via Plinio 44 - 00193 Rome, Italy In the actual automotive environment, the need to increase the performances of materials is requiring extra engineering efforts. The possibility to develop new materials is very important. Indeed alternative solutions in terms of material choice allow designers to optimize their projects and keep low costs of production. Dealing with potential alternatives to traditional quenched and tempered steels for high stressed components, as just seen in previous work, bainitic grades could be a valid solution. This is particularly true if the mechanical performances are kept without compromise the economic savings of bainitic grades. So a detailed evaluation of the mech nical properties of these steels needs a further deepen also for applications requiring case hardening treatment. The scope of this article is to introduce and show the characterization phase of a new bainitic low carbon content for a high-performance crankshaft application. I details, a long-life fatigue resistance tai case test is performed after a gas nitr ding tre tment a he results are compared to the ntreated material. The increment of the fatig e resistance i qua tified and can be utilized by structural engineers to develop and optimized their pr jects. Moreover, the case hardened depth and microhardness profiles are collected an evaluated in terms of nitriding effectiveness (nitrogen diffusion). © 2018 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/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. Keywords: mechanical component, material selection, crankshaft, steel, nitriding, fatigue; © 2018 The Authors. Published by Elsevier B.V. This is a open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress A alysis. AIAS 2018 International Conference on Stress Analysis Mechanical characterization of a new low carbon bainitic steel for high performance crankshaft Paolo Citti a , Alessandro Giorgetti a, *, Ulisse Millefanti a a Guglielmo Marconi University, Department of Innovation and Information Engineering,, Via Plinio 44 - 00193 Rome, Italy Abstract In the actual automotive environment, the need to increase the performances of materials is requiring extra engineering efforts. The possibility to develop new materials is very important. Indeed alternative solutions in terms of material choice allow designers to optimize their projects and ke p low costs of production. Dealing with potential alternatives to traditional quenched and tempered steels for high stressed components, as just seen in previous work, bainitic grades could be a valid solution. This is particularly true if the mechanical performances are kept without compromise the economic savings of bainitic grades. So a detailed evaluation of the mechanical properties of these steels needs a further deepen also for applications requiring case hardening treatment. The scope of this article is to introduce and show the characterization phase of a new bainitic low carbon content for a high-performance crankshaft application. In details, a long-life fatigue resistance staircase test is performed after a gas nitriding treatment and the results are compared to the untreated material. The increment of the fatigue resistance is quantified and can be utilized by structural engineers to develop and optimized their projects. Moreover, the case hardened depth and microhardness profiles are collected and evaluated in terms of nitriding effectiveness (nitrogen diffusion). © 2018 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/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. Keywords: mechanical component, material selection, crankshaft, steel, nitriding, fatigue; Abstract

© 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.

* Corresponding author. Tel.: +39-06-377251; fax: +39-06-37725212. E-mail address: a.giorgetti@unimarconi.it * Corresponding author. Tel.: +39-06-377251; fax: +39-06-37725212. E-mail address: a.giorgetti@unimarconi.it

2452-3216 © 2018 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/3.0/) Peer-revi w u er responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. 2452-3216 © 2018 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/3.0/) Peer-review under responsibility of the Scientific ommittee of AIAS 2018 International Conference on Stress Analysis.

* 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 PCF 2016. 2452-3216  2018 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/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. 10.1016/j.prostr.2018.11.074