PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 2249–2254 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int 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. ECF22 - Loading and Environmental effects on Structural Integrity Influence of temperature and exploitation time on hardness and micro-structure of a welded joint in a reactor mantle I vica Čamagić a, *, Si n Sedmak b , Zijah Burzić c , Aleksandar Sedmak d a Faculty of Technical Sciences, 7 Kneza Miloša Str et, K. Mitrovica b Innovation Centre of the Faculty of Mechanical Engineering, 16 Kraljice Marije Street c Militar y Technical Institute, 1 Ratka Resanovića Street, Belgrade d Faculty of Mechanical Engineering, University of Belgrade This paper presents the analysis of the influence of temperature and exploitation time on the cross-sectional hardness and micro structure changes of characteristic zones of a welded joint made of low-alloyed Cr-Mo steel A-387 Gr. B. Exploited parent metal is a part of a reactor mantle which was working for over 40 years and is in the damage repair stage, i.e. part of its mantle is being replaced with new material. Cross-sectional hardness of a butt-welded joint was measured and macroscopic investigation of the welded joint and microstructural analysis of the parent material, weld metal and the heat affected zone were performed. The comparison of parameters obtained for characteristic zones of a welded joint provides a way to meausre the justifiability of the selected welding technology. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Crack, low-alloyed steels, welded joint, hardness, micro-structural properties 1. Introduction Long-time exploitation period of a pressure vessel - reactor (over 40 years) caused certain damage to the reactor mantle. The occurrence of this damage demanded a thorough inspection of the reactor structure itself, along with repairing of damaged parts. Reactor repairs included replacing of a part of the reactor mantle with new material. The pressure vessel considered here was made low-alloyed Cr-Mo steel A-387 Gr. B in accordance with ASTM standard with (0,8- © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Influence of temperature and exploitation time on hardness and micro-structure of a welded joint in a reactor mantle I vica Čamagić a, *, Simon Sedmak b , Zijah Burzić c , Aleksandar Sedmak d a Faculty of Technical Sciences, 7 Kneza Miloša Street, K. Mitrovica b Innovation Centre of the F ulty of M chanical Eng neering, 16 raljic M rije Street c Militar y Technical Institute, 1 Ratk Resa ovića Street, Belgrade d F culty of Mecha ical Engineering, U iversity of Belgrade Abstract This paper presents the analysis of the influence of temperature and exploitation time on the cross-sectional hardness and micro structure chang s of characteristic zones of a w lded joint mad of low-alloyed Cr-Mo steel A-387 Gr. B. Exploited parent metal is a part of a react r mantle which was w rking for over 40 years and is in th damage repair stage, i.e. part of its mantle is being replaced with new material. Cross-sectional hardness of a butt-welded joint was easured and macroscopic investigation of the welded joint and microstructural analysis of the parent material, weld metal and the heat affected zone were performed. T comparis n of parameters obtained for characteristic zones of a welded joint provides a way to meausre the justifiability of t selected welding technology. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th ECF22 organiz rs. Keywords: Crack, low-alloyed steel , welded joint, hardness, micro- tructural properties 1. Introduction Long-time exploitation period of a pressure vessel - reactor (over 40 years) caused certain damage to the reactor mantle. The occurrence of this damage demanded a thorough inspection of the reactor structure itself, along with repairing of damaged parts. Reactor repairs included replacing of a part of the reactor mantle with new material. The pressure vessel considered here was made low-alloyed Cr-Mo steel A- 87 Gr. B in accordance with ASTM standard with (0,8- © 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 r sponsibility of the ECF22 organizers. * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: ivica.camagic@pr.ac.rs * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail ad ress: ivica.camagic@pr.ac.rs

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.2018.12.132