PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 424–429 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect StructuralInt grity 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Microhardness and Macrostructures of Friction Stir Welded T-joints Andrijana Đurđević a , Aleksandar Sedmak b , Aleksandar Živković c , Đorđe Đurđević a , Milan Marković a , Miodrag Milčić d a Tehnikum Taurunum - Coll ge of Applied Engineering Studies, 11080 Belgrade, Serbia b Faculty of Mechanical Engineering, 11120 Belgrade, Serbia c Goša FOM Company, 11420 Smederevska Palanka, Serbia d Faculty of Mechanical Engineering, 18000 Niš, Serbia Abstract The results of research regarding the friction stir welding process of T-joints are presented in this paper. Experimental welding of two and three aluminium plates were performed in order to obtain T-joints. Microhardness measuring and macrostructural examinations of welded T-joints of aluminium alloy are processed. All phases of the welding process are monitored by visual control. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Friction stir welding, aluminium alloy 5754-H111, T-joints, microhardness, macrostructu es 1. INTRODUCTION T-joints of aluminum alloys are used in many industries: automotive, aerospace, shipbuilding, etc. Aluminum has good corrosion resistance. The main role of T-joints is to increase the rigidity of structures. But aluminum alloys are hardly welded by conventional welding processes. The poor solidification microstructure and porosity in the fusion zone which leads to the loss in mechanical properties as compared to the base material make these alloys generally classifie as nonweldable alloys. Friction stir welding (FSW) was found to be a very successful approach to weld aluminium alloys in a solid-state joining process. [1-3] The friction stir welding of the T-joint is done in the following way: two or three working plates are rigidly clamped on the machine table. Welding machines can be specialized, figure 1.a and it is very expensive. Also, welding can be done on milling machine, figure 2.b. The welding tool consists of three main parts: shoulder, top of shoulder and probe. The probe is the part of welding tool that passes entirely through the working plates to and the tool shoulder is ECF22 - Loading and Environmental effects on Structural Integrity Microhardness and Macrostructures of Friction Stir Welded T-joints Andrijana Đurđević a , Aleksandar Sedmak b , Aleksandar Živković c , Đorđe Đurđević a , Milan Marković a , Miodrag Milčić d a Tehnikum Taurunum - Collage of Applied Engineering Studies, 11080 Belgrade, Serbia b Fac lty of Mechanical Engineeri g, 11120 Belgrade, Serbia c Goša FOM Company, 11420 Smederevska Palanka, Serbia d F culty of Mech ical Engine ring, 18000 Niš, Serbia Abstract The r sults of r search regarding the frict on stir welding process of T-j ints are pres nt d in this paper. Experimental welding f two and three aluminium plates were performed in order to obtain T-joints. Microhardness measuring and macrostructural exami ations of welded T-joints of aluminium alloy are processed. All phases of the welding process are monitored by visu l control. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Friction stir welding, aluminium alloy 5754-H111, T-joints, microhardness, macrostructures 1. INTRODUCTION T-joints of aluminum alloys are used in ma y industries: automotive, aerosp ce, shipbuilding, etc. Aluminum has good corrosion resistance. The main role of T-joints is to increase the rigidity of structures. But aluminum alloys are hardly welded by conventional welding processes. The poor solidification microstructure and porosity in the fusion zone which lea s to the loss in mechan cal properties as compared to the base material make these alloys generally classified as nonweldable alloys. Friction stir welding (FSW) was found to be a very successful approach to weld aluminium alloys in a solid-state joining process. [1-3] The friction stir welding of the T-joint is done in the following way: two or three working plates are rigidly clamped on the machine table. Welding machines can be specialized, figure 1.a and it is very expensive. Also, welding can be done on milling machine, figure 2.b. The welding tool consists of three main parts: shoulder, top of shoulder and probe. The probe is the part of welding tool that passes entirely through the working plates to and the tool shoulder is © 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.: +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.2018.12.071