PSI - Issue 12

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edia Structural Int gr ty 12 (2018) 3–8 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 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. © 2018 The Authors. Published by Elsevier B.V. This is an o en access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-n /3.0/) Peer-review und responsibility of the Scientific Co mittee of AIAS 2018 International Con erence on Stress Analysis. AIAS 2018 International Conference on Stress Analysis Fatigue life evaluation of car front halfshaft C. Barone a , R. Casati b , L. Dusini b , F. Gerbino b , E. Guglielmino c , G. Risitano c *, D. Santonocito c a University of Modena and Reggio Emilia, Department of Sciences and Method for Engineering, Via Amendola 2, 42122 Reggio Emilia, Italy b Maserati S.p.a., Via Emilia Ovest 911, 41123 Modena, Italy c University of Messina, Department of Engineering, Contrada di Dio, 98166 Messina, Italy Abstract The present paper is the result of the collaboration between the Engineering Depa tment of Messina University nd the car company Maserati S.p.A. The aim of this paper is to determine the T-N torsion fatigue curve at R= -1 of the mechanical system "front halfshaft" of an existing car. In particular, experimental fatigue tests were carried out in the laboratories of the Engineering Department of the University of Messina. Torsion fatigue tests of the entire mechanical system were carried out on 15 different front halfshafts. Evaluations of the crack propagation and of failure analysis were made to determine the causes of breakage. In conclusion, the T-N fatigue curve of the mechanical system "front halfshaft" has been obtained. © 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: car halfshaft; fatigue assessment; reverse engineering. 1. Introduction Halfshafts are among the most important component of a car power transmission because they deliver the torque from the differential to the wheels. They are composed by a spline shaft coupled with a fixed joint at one end and a AIAS 2018 International Conference on Stress Analysis Fatigue life evaluation of car front halfshaft C. Barone a , R. Casati b , L. Dusini b , F. Gerbino b , E. Guglielmino c , G. Risitano c *, D. Santonocito c a University of Modena and Reggio Emilia, D p rtment of Sciences nd Method for Engineering, Via Amendola 2, 42122 Reggio Emilia, Italy b Maserati S.p.a., Via Emilia Ovest 911, 41123 Modena, Italy c University of Messina, Department of Engineering, Contrada di Dio, 98166 Messina, Italy Abstract The present paper is the result of the collaboration between the Engineering Department of Messina University a d the car company Maserati S.p.A. The aim of this aper is to determine the T-N torsion fatigue curve at R= -1 of the mechanical system "front halfshaft" of an xisting car. In particular, experimental fatigue tests were carried out in the laboratories of the Engineering Department of the University of Messina. Torsion fatigue tests of the entire mechanical system were carried out on 15 different front halfshafts. Evaluations of the crack propagation and of failure analysis were made to determine the causes of breakage. In conclusion, the T-N fatigue curve of the mechanical system "front halfshaft" has been obtained. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-N -ND license (http://creativecomm ns.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. Keywords: car halfshaft; fatigue assessment; reverse engineering. 1. Introduction Halfshafts are among the most important co ponent of a car power transmission because they deliver the torque from the differential to the wheels. They are composed by a spline shaft coupled with a fixed joint at one end and a © 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.: +39 347 3209239. E-mail address: giacomo.risitano@unime.it * Corresponding author. Tel.: +39 347 3209239. E-mail address: giacomo.risitano@unime.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-review under 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 ope access article under t CC BY-N -ND lic nse (http://creativecomm s.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.

* 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.2018.11.112