PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3539–3545 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Tensile mechanical performance of electron-beam welded joints from aluminum alloy (Al-Mg-Si) 6156 Nikolaos D. Alexopoulos a, *, Theano N. Examilioti a , Vasilis Stergiou b , Stavros K. Kourkoulis c a Department of Financial Engineering, University of the Aegean, 82 132 Chios, Greece b Special Processes & Laboratories Depaartment, Hellenic Aerospace Industry, 320 09 Schimatari, Greece c Laboratory of Testing and Materials, Section of Mechanics, National Technical University of Athens, 9 Heroes Polytechniou Str., 15780 Athens, Greece Abstract The mechanical behavior of both, reference and electron beam welded aluminum alloy 6156 specimens was experimentally investigated. Sheets of AA6156 were artificially aged before and after the welding process and tensile specimens were machined from the welded sheets according to the ASTM E8 standard. The specimens were artificially aged at 170 o C for different times that corresponded to all precipitation-hardening conditions, namely under-ageing (UA), peak-ageing (PA) and over-ageing (OA). The results showed that the effect of welding without any heat tre tment (con iti n T4) decreases by, about 100 MPa, the y eld str s and the yield strength, while the remaining elongati at fracture hardly exceeds 4 %. It was also shown hat artificial ageing before welding increases the tensile uctility (almost 50 % joi t efficiency in deformation) while the artificial ageing post to welding significantly increases the strength properties (more than 75 % joint efficiency in strength). © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: tension; aluminum alloy; heat treatment; welding; precipitation-hardening; 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Tensile mechanical performance of electron-beam welded joints from aluminum alloy (Al-Mg-Si) 6156 Nikolaos D. Alexopoulos a, *, Theano N. Examilioti a , Vasilis Stergiou b , Stavros K. Kourkoulis c a Department of Financial Engineering, University of the Aegean, 82 132 Chios, Greece b Special Processes & Laboratories Depaartment, Hellenic A rospace Industry, 320 09 Schimatari, Greece c Laboratory of Testing and Materials, Section of Mechanics, National Technical University of Athens, 9 Heroes Polytechniou Str., 15780 Athens, Greece Abstract The mechanical behavior of both, reference and lectron beam w lded alumi um alloy 6156 specim ns was exp rimentally investigated. Sheets of AA6156 were artificially aged before and after the welding process and tensile specimens were machin d from the welded sheets according to the ASTM E8 standard. The specimens were artificially aged at 170 o C for different times that corresponded to all precipitation-hardening conditions, namely under-ageing (UA), peak-ageing (PA) and over-ageing (OA). The results show d that the effect of welding without any heat treatment (condition T4) decreases by, bout 100 MP , the yield stress and the yield strength, whil the r maining elongation at fracture hardly exce ds 4 %. It as also shown that artificial ageing before weldi g increases the tensile ductility (almost 50 % joint efficiency in deformation) while the artificial ageing post to welding significantly increases the strength properties (more than 75 % joint efficiency in strength). © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committe of ECF21. Copyright © 2016 The Authors. Published by El evier B.V. This is an open access article u der the CC BY-NC-ND licen e (http://creativec mmons.org/licenses/by-nc-nd/4.0/). Peer-review under responsib lity of the Scientific Committee of ECF21.

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: tension; aluminum alloy; heat treatment; welding; precipitation-hardening;

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

* 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 ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +0030-22710-35464; fax: +0030-22710-35429. E-mail address: nalexop@aegean.gr * Corresponding author. Tel.: +0030-22710-35464; fax: +0030-22710-35429. E-mail address: nalexop@aegean.gr

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 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/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.441