PSI - Issue 13

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ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1589–1594 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 ScienceDirect Structural Integrity 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 and numerical investigations of the critical values of J integral for the steel of steam pipelines Bojana Aleksic a , Ljubica Milovic b , Aleksandar Grbovic c , Abubkr Hemer b , Vujadin Aleksic d , Milorad Zrilic b a Innovation Centre of Faculty of Technology and Metallurgy, Karnegijeva 4, 11120 Belgrade, Serbia b University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11120 Belgrade, Serbia c University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade, Serbia d Institute for testing of materials- IMS Institute, Bulevar vojvode Miši ć a 43, 11000 Belgrade, Serbia Abstract Steel grade 14MoV6-3 is a low-carbon microalloyed steel with addition of chromium and molybdenum. This grade is designed mainly for power industry applications, withstanding operating at elevated temperatures .In this paper, mechanical properties of steel grade 14MoV6-3 and methodology of calculation of critical values of the J -integral are presented. The level of damage is determined by analyzing the virgin material of the same grade. The focus of presented investigation is on the experimental J integral determination, where critical values of the J-integral (J IC ) are compared with the values obtained by using the finite element methods (FEM). FEM model was defined on the basis of experimental conditions and obtained numerical values should confirm our experimental results. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: steel for elevated temperature application; mechanical properties; J -integral; FEM; crack. 1. Introdaction Steam pipelines belong to the highly reliable structures, which operate in complex conditions exposed to the effects of creep and low-cycle thermal fatigu at elevated temp rature. For this reason, the steam pipeline, i.e. steam pipeline material, together with its welded joints, is subject to damage that accumulates during exploitation and which can lead to fracture. The basic property of steel for the steam pipelines is creep and fracture resistance during the prescribed time. [1] Steel grade 14MoV6-3 is a low-carbon microalloyed steel with addition of chromium and molybdenum. This grade is designed mainly for power industry applications, withstanding operating at elevated temperatures .Crack resistance © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Experimental and numerical investigations of the critical values of J integral for the st el of steam pip lines Bojana Aleksic a , Ljubica Milovic b , Aleksandar Grbovic c , Abubkr Hemer b , Vujadin Aleksic d , Milorad Zrilic b a Innovation Centre of Faculty of Technology and Metallurgy, Karnegijeva 4, 11120 Belgrade, Serbia b University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11120 Belgrade, Serbia c University of B lg ade, aculty of Mechanical Engin ering, Kraljice Marije 16, 11120 Belgrade, Serbia d Institute for t sting of m terials- IMS Institute, Bulevar vojvode Miši ć a 43, 11000 Belgrade, Serbia Abstract Steel grade 14MoV6-3 is a low-carbon microalloyed steel with addition of chromium and molybdenum. This grade is designed mainly for power industry applications, withstanding operating at elevated temperatures .In this paper, mechanical properties of st l r - and methodol gy of c lculation of cr ic l values f t e J - ntegral are pres ted. e level of dama e is determined by analyzing the virgin mater al of the sam grade. Th focus of resent d i vestigation is on the ex erimental J int gral termination, where critical values of the J-integral (J IC ) re compared with th v ues obtained by using th finite elem nt methods (FEM). FEM mod l was defined on the basis of experimental conditions and obtain d numerical valu s should confirm our experimental results. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. K ywords: steel for el vated temperature application; mechanical properties; J -integral; FEM; crack. 1. Introdaction Steam pipelines belong to the highly reliable structures, which operate in complex conditions exposed to the effects of creep and low-cycle thermal fatigue at elevated temperature. For this reason, the steam pipeline, i.e. steam pipeline material, together with its welded joints, is subject to damage that accumulates during exploitation and which can lead to fracture. The basic property of steel for the steam pipelines is creep and fracture resistance during the prescribed time. [1] Steel grade 14MoV6-3 is a low-carbon microalloyed steel with addition of chromium and molybdenum. This grade is designed mainly for power industry applications, withstanding operating at elevated temperatures .Crack resistance © 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  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.335

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