PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1682–1688 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 Effects of welding technology on the occurrence of fracture in welded joints Radomir Jovičić , Simon Sedmak a *, Radica Prokić Cvetković b , Olivera Popović b , Katarina Jov ičić Bubalo c , Ne ad Milošević b a Innovation Centre of Faculty of Mechanical Engineering, 11120 Belgrade, Serbia b Faculty of Mechanical Engineering, 11120 Belgrade, S rbia c GOŠA Institute, 11000 Belgrade, Serb ia Welded joints represent locations where failure is most likely to ccur in welded structures. Welded joint failure depends on their vulnerability to crack initiation and growth. These factors are significantly influenced by the welding technology. The effect of welding technology on the frequency of welded joint failure is complex, and has been thoroughly researched in literature. However, there are still numerous factors whose influence is not sufficiently explained. In this paper, the ratio of strength and plasticity of parent materials and weld metals on deformation properties of welded joint zones were analysed, along with the effects of groove edge temperature on cooling time in the heat affected zone and the effect of multiple defects on local stress increase. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: welding technology, strength and plasticity, cooling time, welded joint defects 1. Introduction Welded joints represent critical locations in welded structures due to their non-homogeneity, residual stresses and stresses resulting from geometry and weld dimensio s. Welding technology affects these factors the most. Its effect of welded joint vulnerability towards fracture is complex and has been thoroughly researched in literature. However, there are still numerous factors whose influence is not sufficiently explained. During the selection of filler materials for welded joint, the ratio ECF22 - Loading and Environmental effects on Structural Integrity Effects of welding technology on the occurrence of fracture in welded joints Radomir Jovičić a , Simon Sedmak a *, Radica Prokić Cvetković b , Olivera Popović b , Katarina Jov ičić Bubalo c , Nenad Milošević b a Innovation Centre of Faculty of Mechanical Engineering, 11120 Belgrade, Serbia b Faculty Me hanical Engi eering, 11120 Belgrade, Serbi c GOŠA I stitute, 11000 Belgrade, S rb i Abstract Weld d joints r resent l cations where failu e is most likely to occur n weld d structures. Welded j int failure depends on their vulnerability to crack initiation and growth. These factors are significantly influenced by the welding technology. The effect of welding techn logy on the freque cy of elded joint failure is complex, and has been thoroughly r search d i literature. However, th re are still numer us factors whose influence is not sufficiently explained. In this paper, the ratio of stre gth and plasticity of parent materials and weld metals on deformation properties of weld d joi t zones were analysed, al ng with the effects of groove edge te p rature on cooling time i the heat affected zon and the effect of multiple d fects on local stress increase. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: welding technology, strength and plasticity, cooling time, welded joint defects 1. Introduction Welded joints represent critical locations in welded structures due to their non-homogeneity, residual stresses and stresses resulting from geometry and weld dimensions. Welding technology affects these factors the most. Its effect of welded joint vulnerability towards fracture is complex and has been thoroughly researched in literature. However, there are still numerous factors whose influence is not sufficiently explained. During the selection of filler materials for welded joint, the ratio © 2018 The Auth rs. Published by Elsevier B.V. Peer-revi w under responsibility of the ECF22 or anizers. © 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. Abstract

* 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. * Corresponding author. Tel.: +38162295496; fax: +0-000-000-0000 . E-mail address: simon.sedmak@yahoo.com * Corresponding author. Tel.: +38162295496; fax: +0-000-000-0000 . E-mail ad ress: sim n.sedmak@yahoo.com

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.2018.12.351