PSI - Issue 8

ScienceDirect Available online at www.sciencedirect.com Available o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 8 (2018) 204–211 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2017) 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. 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 AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Methodology development to design a representative test specimen for wear damage in spline couplings Francesca Curà a *, Andrea Mura a , Federica Adamo a a Department of Mechanical and Aerospace Engineering, Politecnico di Torino, corso Duca degli Abruzzi 24, Torino, Italy Abstract Aim of this paper is to develop a new methodology in order to design a representative test specimen for wear damage characterisation in spline couplings. In other words, real component and test specimen (same material) have been considered having a common target that is an isodamage condition reached after an established number of working (testing) cycles.Influence parameters chosen for this aim are, under the hypothesis of equal friction coefficient, hertzian pressure due to the load entity (torque) and the corresponding slidings. Slidings have been determined referring to two different working conditions, traditional fatigue testing with variable torque (aligned conditions) and wear testing in misaligned conditions. Specimen geometry has been firstly st ted following DIN 5480 requirements, then profile micro geometries have been varied to tune the established target parameters and the corresponding FEM simulations have been carried on. Hertzian pressure values and corresponding contact areas have been verified by classical formula.A preliminary experimental activity has been done in order to verify the specimen design related to isodamage dimensioning aspects. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scie tific Committee of AIAS 2017 International Conf rence n Stress Analysis. Keywords: spline coupling; fatigue; fretting wear; iso amge c aracterisati n; FE simulations. One of the most important causes of run outs in spline couplings for high power transmissions is fretting wear. The relative motion between teeth in contact may usually create a surface damage and the corresponding progressive loss of material. Slidings are mainly due to angular misalign ents and variable amplitude torques. AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Methodology development to design a representative test specimen for wear damage in spline couplings Francesca Curà a *, Andrea Mura a , Federica Adamo a a Department of Mechanical and Aerospace Engineering, Politecnico di Torino, corso Duca degli Abruzzi 24, Torino, Italy Abstract Aim of this paper is to develop a new methodology in order to design a representative test specimen for wear damage characterisation in spline coupli g . In oth r words, real compon nt and test specimen (same material) have been co sid red h ving a common targe that is an isodamage condition reached after an established numb r of working (testing) cycles.Influence param ters chosen for this aim are, under the hypothesis of qual friction coefficient, hertzia pressure due to the lo entity (torq ) and the corresponding slidings. Slidings have been dete mined referring to two different working conditions, traditional atigue testing with variable torque (align d conditio s) and wear testing in mi align d co ditions. Specimen g ometry has been firstly stated following DIN 5480 requirements, then profile micro geometries have been varied to tune the established targe par meters and th corresponding FEM simulations have been carri d on. Hertzian pr ssure values and corr sponding contact areas have been verified by classical formula.A preliminary experimental activity has been done in order to verify the specimen design related to isodamage dimensioning aspects. © 2017 The Author . Published by Elsevier B.V. Peer-review und r responsibility of the Scientific Committee of AIAS 2017 Internat onal Conference o Stress Analysis. Keywords: spline c upling; fatigue; fr tting wear; isodamge c aracterisatio ; FE simulations. 1. Introduction One of the most important causes of run outs in spline couplings for high power transmissions is fretting wear. The relative motion between teeth in contact may usually create a surface damage and the corresponding progressive loss of material. Slidings are mainly due to angular misalignments and variable amplitude torques. © 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. 1. Introduction

* Corresponding author. Tel.: +39-011-0906930. E-mail address: francesca.cura@polito.it * Correspon ing author. Tel.: +39-011-0906930. E-mail address: francesca.cura@polito.it

2452-3216© 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. 2452 3216© 2017 The Authors. Published by Elsevier 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.2017.12.022