PSI - Issue 8

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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 © 2018 The Auth rs. Published by Elsevier B.V. Peer-review und r r sponsibility f the Sci nt fic Committe of AIAS 2017 International Conference on Stress Analysis AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Dynamic modeling of wind turbines. Experimental tuning of a multibody model F. Cianetti a , 00 F0 F *, A. Cetrini a , M. Becchetti a , F. Castellani a , C. Braccesi a a University of Perugia - Department of Engineering, via G. Duranti 67, Perugia, Italy Abstract This work is part of a research project funded by the Italian Ministry of the University and Research (MIUR), under the call for "National Interest Research Projects 2015 (PRIN 2015)", titled "Smart Optimized Fault Tolerant WIND turbines (SOFTWIND)". Within this project, the research unit of the University of Perugia (UniPG) aims to develop dynamic modeling and simulation methodologies and fatigue behavior evaluation ones for wind turbine as a whole. The development of these methodologies will be aimed at predicting the life of gener ic wind turbines, also providing important and fundamental parameters for optimizing their control, aimed at reducing the failures of thesemachines. In the present paper, a small turbine, developed at the Department of Engineering of the University of Perugia, will be analy zed. The multibody modeling technique adopted and the experime tal ctivity conducted in the wind tunnel of UniPG, needed for the tuning of themodel, will be described. The analysis of both model behavior and experimental data has allowed for the def inition of a robust multibody modeling technique that adopts a freeware code (NREL - FAST), universally considered to be a reference in this field. The goodness of the model guarantees the capabilities of the simulation environment to analyze the real load scenar io and the fatigue behavior of this kind of device. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis . AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Dy amic modeling of wind turbines. Experimental tuning of a multibody model F. Cianetti a , 00 F0 F *, A. Cetrini a , M. Becchetti a , F. Castellani a , C. Braccesi a a University of Perugia - Department of Engineering, via G. Duranti 67, Perugia, Italy Abstract This work is part of a research project funded by the Italian Ministry of the University and Research (MIUR), under the call for "Nat onal Interest Research P ojects 2015 (PRIN 2015)", titled "Smart Optimized Fault To erant WIND turbines (SOFTWIND)". Wi in this project, the r search unit of the Univ r ity of Perugia (UniPG) aims to dev lop dynamic mod ling an simulation methodologies and fatigu behavior evaluatio ones for wind tu bine as a wh le. The evelop ent of these meth dolog es will be aimed at predicting the life of gener ic wind turbines, al o providing important and fundamental parameters for optimizing their control, aimed at reducing the failur s of thesemachines. In the present paper, a small turbine, develope at the D partment of Engineering of the University of Peru ia, will be analy zed. The multibody modeling t chnique adopted and the experimental activity conducted in the wind tunnel of UniPG, needed for the tuning of themodel, will be described. The analysis of both model b havior and experimental data has allow d for th def inition of a robust multibody modeling technique that adopts a fre ware code (NREL - FAST), universally consid red t be a refere ce in t is fi ld. The goodness of the model guarantees the capabilities of the simulation environment to analyze the real load scenar io and the fatigue behavior of this kind of device. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis .

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: WindTurbines; Mult i Body Simulat ion; WindTunnel Testing Keywords: WindTurbines; Mult i Body Simulat ion; WindTunnel Testing

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

* Corresponding author. Tel.: +39-075-585-3728; fax: +39-075-585-3703. E-mail address: filippo.cianetti@unipg.it * Correspon ing author. Tel.: +39-075-585-3728; fax: +39-075-585-3703. E-mail address: filippo.cianetti@unipg.it

2452-3216©2017TheAuthors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis . 2452-3216©2017TheAuthors. Published by Elsev er B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 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 Copyright  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis 10.1016/j.prostr.2017.12.006