PSI - Issue 10

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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 Ltd. 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 the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Effect of corrosion exposure on the mechanical performance of 2024 aluminum alloy electron beam welded joints E. Dovletoglou a , P. Skarvelis b , V. Stergiou c , N.D. Alexopoulos a, * a University of the Aegean, School of Engi e rin , Department of Financial Engineering, 821 32 Chios, Greece b National Technical University of Athens, School of Mining and Mettallurgical Engineering , 7 Heroes Polytechniou St.,127 73 Zografou, Greece c Research and Product Design, Hellenic Aerospace Industry S.A., P.O. Box 23, Schimatari, Greece Abstract The present work is focused o the effect of corrosi n exp sure on 2024-T3 electron beam welded joints. Sheets were face-to-face electron beam welded and tensile specimens were extracted from the sheets. The welded region was in the middle section of their gauge length. The specimens were exposed to exfoliation corrosion solution and for different exposure times to investigate the effect on the tensile mechanical properties. Non-corroded specimens showed that the joining efficiency of electron beam welded specimens is ~70%. Conventional yield stress decreased with corrosion exposure time, with small exposure times (<8 h) exhibiting a high corrosion-induced decrease rate. Corrosion-induced decrease of tensile elongation at fracture seems to follow an exponential correlation against corrosion exposure time. Fracture started always from the weld’s root and for small xposure times fracture occurred within th fusion zone. © 2018 The Authors. Published by Elsevier Ltd. 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 committe of the 1 st International Confer nce of the Greek Society of Expe imental Mechanics of Materials Keywo ds: Aluminum alloys; electron beam welding; xfoliation c rrosion 1. Introduction Aircraft industries, with the view of continuous improvement, struggles to reduce the extra operational and manu facturing costs, by decreasing structural weight, minimizing manufacturing process time and material required along 1 st . , . , . , . . , a i rsit f t , l f i ri , rt t f i i l i ri , i s, r b ti l i l i rsit f t s, l f i i tt ll r i l i ri , r s l t i t., r f , r c s r r t si , ll i rospace Industr . ., P.O. Box 23, Schimatari, Greece s t i t t io o l t l j i t . t t l t l t il i t t t t . l i i t i l ti t i l t . i t li ti i l ti i t ti t i ti t t t t t il i l ti . i t t t j i i i i l t l i i . ti l i l t it i ti , it ll ti i iti i i i t . i i t l l ti t t t ll ti l l ti i t i ti . t t t l t l t ll ti t it i t i . 18 The Authors. Published by Els vier Ltd. i i n open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-n /3.0/). Peer- evi w under responsibilit f t i tifi itt e f t st I t r ti l f r f t r ociety f Exp ri ntal chani f t ri l r s: l i ll s; l tr l i ; f li ti rr si . i i t i t i , it t i ti i t, t l t t t ti l facturi osts, by de reasing structural weight, minimizing manufacturing pr ti t i l i l © 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.: +30 22710 35464; fax: +30 22710 35419. E-mail address: nalexop@aegean.gr Received: May 22, 2018; Received in revised form: July 30, 2018; Accepted: July 07, 2018 rr s i t r. l.: ; f : . - il r ss: l . r i i r is f r : J l , ; t : J l , i : , ;

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 Ltd. 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 the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 10.1016/j.prostr.2018.09.011 2452- 3216 © 2018 The Authors. Published by Elsevier Ltd. 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 the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials - t r . li l i r t . i i rti l r t - - li ( tt :// r ti . r /li / - - / . /). r-r i r r i ilit f t i tifi itt f t e 1 st I t r ti l f r f t r i t f ri t l i f t ri l * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt