PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 2216–222 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th ECF22 rganizers. ECF22 - Loading and Environmental effects on Structural Integrity The influence of heat input on the toughness and fracture mechanism of surface weld metal O. Popović *, R. Prokić Cvetković a , Lj. Radović b , Z. Burzić b , D. Arsić c a University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, Belgrade, Serbia b Military technical institute, Ratka Resanovi ć a 1, Belgrade, Serbia c University of Kragujevac, Faculty of Engineering, Sestre Janji ć 6, Kragujevac, Serbia Abstract Surface welding is a way to extend the exploitation life of damaged parts and constructions and the heat input has a major influence on the weldment properties. In this paper is shown the influence of the heat input on the toughness and the fracture mechanism of the surface welded joint. Surface welding of high carbon steel with self shielded wire was conducted with three different heat inputs (6kJ/cm, 10 kJ/cm and 16 kJ/cm). Total impact energy, crack initiation and crack propagation energy were estimated at room temperature, -20 o C and -40 o C. Fracture analysis of fractured surfaces was also conducted and it has been found that increasing of heat input leads to an increase of share of transgranular brittle fracture, what is in complete accordance with the obtained energy values. Based on all obtained results, the optimum value of heat input for welding procedure applied was defined. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Heat input; Fracture mechanism; Toughness; Surface welding 1. Introduction Surface welding is a way to extend the exploitation life of damaged parts and constructions and the heat input has a major influence on the weldment properties. The dependence of the mechanical properties on the welding conditions was studied, but the effect of heat input has been studied insufficiently by M.Pirinen et al. (2015). The most important characteristic of heat input is that it governs the cooling rates in welds and thereby affects the microstructure of the weld metal. At surface welding, heat input affects on the mixture degree, as relevant parameter ECF22 - Loading and Environmental effects on Structural Integrity The influence of heat input on the toughness and fracture mechanism of surface weld metal O. Popović a *, R. Prokić Cvetković a , Lj. Radović b , Z. Burzić b , D. Arsić c a University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, Belgrade, Serbia b Military te hnical institute, R tka Resanovi ć a 1, Belgrade, Serbia c University of Kragujevac, Facul y of Engineering, Sestre Janji ć 6, Kragujevac, Serbia Abstract Surface welding is a way to extend the exploitation life of damaged parts and constructions and the heat input has a major influence on the weldment properties. In his paper is shown the influence of the heat input on the t ugh ess and the fracture mechanism of th surface welded joint. Surface welding of high carbon steel with self shielded wire was conducted with three different heat inputs (6kJ/ m, 10 kJ/cm and 16 kJ/cm). Total impact energy, crack initiation and crack propagation energy w re estimated at room temperature, -20 o C -40 o C. Fracture nalysis of fractured surfaces was lso onducted nd it has been found that incre sing of heat input leads to increase of shar of tran granular brittle fr ture, what is i complete accordanc with the obtained e ergy values. Bas d on all obtain d r sult , th ptimum val e of heat input for elding pro edure applied w s defined. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Heat input; Fracture mechanism; Toughness; Surface welding 1. Introduction Surface welding is a way to extend the exploitation life of damaged parts and constructions and the heat input has a major influence on the weldment properties. The dependence of the mechanical properties on the welding conditions was studied, but the effect of heat input has been studied insufficiently by M.Pirinen et al. (2015). The most important characteristic of heat input is that it governs the cooling rates in welds and thereby affects the icrost ucture of the weld metal. At surface welding, h at input affects on the mixture degree, as relevant parameter © 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.: +381113302-259 E-mail address: opopovic@mas.bg.ac.rs * Corresponding author. Tel.: +381113302-259 E-mail ad ress: opopovic@mas.bg.ac.rs

* 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.

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.2018.12.138