PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 409–415 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Influence of corrosion morphology on the Fatigue strength of Bolted joints Zampieri Paolo a *, Andrea Curtarello a , Emanuele Maiorana b , Carlo Pellegrino a , Nicola De Rossi c , Gianpaolo Savio a , Gia maria Concheri a a Department of Civil, Environmental and Architectural Engineering, DICEA, University of Padova, Via Marzolo, 9 - 35131 Padova, Italy b OMBA Impianti & Engineering SpA, ia della Croce 10 - 36040 Torri di Quartesolo, Italy c Department of Management and Engineering, DTG, University of Padova, stradella S. Nicola, 3 - 36100 Vicenza, Italy This note summarizes some recent investigation results on the behavior of corroded steel bolted joints under uniaxial fatigue loading. Fatigue test specimens, were made up using S355 structural steel plates joined together with preloaded M12 bolts of class 10.9 with a geometry that corresponds to the Δσ = 112 MPa EC3 detail category. The accelerated corrosion process was accomplished using an electrolyte consisting of an aqueous 5% NaCl solution whereby the specimens were treated. In particular, during the corrosion process specimens were repeatedly immersed for 2 minutes in the electrolyte and then removed keeping them 60 minutes long in free air at 35 °C. An atmospheric corrosion in marine-industrial environment is well-represented through corrosion test. Fatigue loading tests and surface morphology measurement of uncorroded and corroded specimens were performed and the results were compared. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific C mmittee of ICSI 2017. Keywo ds: Corrosion Fatigue, fatiuge test , fatigue and aterial degradation, bolted joints 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Influence of corrosion morphology on the Fatigue strength of Bolted joints Zampieri Paolo a *, Andrea Curtarello a , Emanuele Maiorana b , Carlo Pellegrino a , Nicola De Rossi c , Gianpaolo Savio a , Gianmaria Concheri a a Department of Civil, Environmental and Architectural Engineering, DICEA, University of Padova, Via Marzolo, 9 - 35131 Padova, Italy b OMBA Impianti & gi e i g SpA, Via della Cr ce 10 - 36040 Torri di Quartesolo, Italy c Department of Management and Engineering, DTG, University of Padova, stradella S. Nicola, 3 - 36100 Vicenza, Italy Abstract This ote summarizes so recent investigation results on the behavior of corrod ste l bolted joints un er uniaxial fatigue loading. F tigue t st specimens, were made up using S355 structural steel plates joined together with preloaded M12 bolts of class 10.9 with a g ometry that correspond to the Δσ = 112 MPa EC3 detail category. Th accelerat d corrosion process w s accomplished using an electrolyt onsi ting of an aqueous 5% NaCl s lution wh reby sp imens were treat d. In particular, during the corrosion proc ss specimens were repeatedly immersed for 2 minutes in the electrolyte and then emoved keeping them 60 minutes long in free air at 35 °C. An tmospheric corrosion in marine-i dustrial environment is w ll-represent d thr ugh corrosion test. Fatigue loading tests and surface morphology measurement of uncorroded and corroded specimens were performed and the results were compared. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Corrosion Fatigue, fatiuge tests, fatigue and materia degradation, bolted joints © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 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.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.189 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Correspon ing author. Tel.: + 39 049 827 5570; fax: +39 049 827 5570. E-mail address: paolo.zampieri@dicea.unipd.it * Corresponding author. Tel.: + 39 049 827 5570; fax: +39 049 827 5570. E-mail address: paolo.zampieri@dicea.unipd.it