PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1977–1984 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity 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. ECF22 - Loading and Environmental effects on Structural Integrity Experimental investigation of fatigue properties of FSW in AA2024 T351 Miodrag Milčić a , Zijah Burzić b , Igor Radisavljević b , Tomaž Vuherer c , Dragan Milčić a *, Vencisl v Gra ulov b a Faculty of Mechanical Engineering, University of Niš, Aleksandra Medvedeva 14, 18000 Niš, Serbia b Military Technical I nstitute, Ratka Res ovića 1, 11000 Beograd, Serbia c University of Maribor, Faculty of Mechanical Engineering, Smetanova17, 2000 Maribor, Slovenia The fatigue properties of friction stir welds (FSW) in 2024-T351 alloys have been investigated. In this paper, the influence of rotation speed and welding speed on the fatigue properties of friction stir welds (FSW) in EN AW-2024 T351 an aluminum alloy is investigated. The paper presents the results of structural and mechanical testing of the alloyed aluminum alloys AA 2024 welded by the FSW process. Using the optimized tool and welding, 6 mm thick plates were connected. The following welding parameters were used: the rotation speed of the tool did not change and amounted to 750 rpm, and the welding speed was 73, 116,150 mm/min. The compounds were obtained without the presence of errors and with an acceptable flat surface of the compound. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: friction stir welding; AA 2024-T351; fatigue properties © 2018 The Authors. P blished by Elsevi r B.V. Peer-review und responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Experimental investigation of fatigue properties of FSW in AA2024 T35 Miodrag Milčić a , Zijah Burzić b , Igor Radisavljević b , Tomaž Vuherer c , Dragan Milčić a *, Vencislav Grabulov b a Faculty of Mechanical Engineering, University of Niš, Aleksandra Medvedeva 14, 18000 Niš, Serbia b Military Tech ical I nstitute, Ra ka Resanovića 1, 11000 B ogr d, Serbia c University of Maribor, Faculty of Mechanical E gineering, Smetanova17, 2000 Maribor, Slovenia Abstract The fatigue pro e ties of friction stir welds (FSW) in 2024-T351 alloys have been investigated. In this paper, the influence f rotation sp ed and welding speed on the fatigue properties of friction stir welds (FSW) in EN AW-2024 T351 an alumin m all y is investigated. The paper pr sents t results of structural and mechanical testing of the alloyed aluminum alloys AA 2024 welded by the FSW rocess. Using t optimized tool and wel ing, 6 mm thick plates were c nnected. The following welding parameters w re used: th rotation speed of the tool did not change and amounted to 750 rpm, and the welding speed as 73, 116,150 mm/min. The compounds were btained without the prese ce of errors and with an acceptable flat urface of the compound. © 2018 The Authors. Published by Elsevier B.V. Peer-review under esponsibility of the ECF22 organizers. Keywords: friction stir welding; AA 2024-T351; fatigue properties 1. Introduction Aluminum alloys have been widely used in the automotive and aerospace industries. Both industries are pushing the boundaries of new innovative products, a requirement for greater capacity and, at the same time, a lower weight with a robust design. Aluminum alloys are characterized by a high load capacity relative to the mass level at a © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Aluminum alloys have been widely used in the automotive and aerospace industries. Both industries are pushing the boundaries of new innovative products, a requirement for greater capacity and, at the same time, a lower weight with a robust design. Aluminum alloys are characterized by a high load capacity relative to the mass level at a Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction

* Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: dragan.milcic@masfak.ni.ac.rs; dragan.milcic@gmail.com * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail ad ress: dragan.milcic@masfak.ni.ac.rs; dragan.milcic@gmail.com

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216© 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216© 2018 The Authors. Published by Elsevier B.V. Peer review under responsibility of the ECF22 organizers.

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. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.220