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 Structu al Integrity 13 (2018) 4 4–4 9 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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 Damages of burner pipes due to the working conditions and its repair welding Drakĉe Tanasković a , Branislav ĐorĊević b, *, Marko Gajin a , Mihajlo AranĊelović b , Nemanja Gostović c a HBIS Group Serbia Iron & Steel ltd., 11300 Smederevo, Serbia b Innovation center of Faculty of Mechanical Engineering, 11120 Belgrade, Serbia c Castolin – Messer Tehnogas AD, 11120 Belgrade, Serbia Abstract Repair welding represents the act vity that restores he working capability of machine or constructi n aused by some damage due to working or environmental condition. Damages of burner pipes, part of the facility "Cold Rolling Mill" Steelwork in Smederevo, which appeared on welded joints during the manufacturing of the burner, and its repairing are presented in this paper. The damages occurred on welded joints along the weld as a result of the working conditions that burner was exposed to. Due to high temperatures that can reach up to 850 °C and "explosion" during gas burning, a crack may appear on the inner side of the burner. The base material of the burner pipes is stainless steel X12NiCrSi35-16. Repair welding is preceded by a series of operations, and one of them is the selection of an electrode. It turned out that inadequate selection of the electrode for repair welding had contributed to the occurrence of cracks on welded joints. Selecting a new electrode and examining its characteristics, as well as performing test welding of pipe that is still in exploitation, had confirmed the importance of proper selection of materials for repairing of burner pipes. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: burn r pipe, repair welding, damages, steel X12NiCrSi35-16; ECF22 - Loading and Environmental effects on Structural Integrity Damages of burner pipes due to the working conditions and its repair welding Drakĉe Tanasković a , Branislav ĐorĊević b, *, Marko Gajin a , Mihajlo AranĊelović b , Nemanja Gostović c a HBIS Group Serbia Iron & Steel ltd., 11300 Smederevo, Serbia b Innovation center of Faculty of Mechanical Engineering, 11120 Belgrade, Serbia c Castolin – Messer Tehnogas AD, 11120 Belgrade, Serbia Abstract Repair eldi represents th activity that restores the working cap bility of mac ine or construction caused by som damage due to working or environmental con iti n. Damages of burner pipes, part of the facility "Cold Rolling Mill" Ste lwork in Sm derevo, which appea ed on el e j i t during the manufacturing f the burner, and its repairing ar presented in this paper. The da ages occurred on welded joints along the weld as a res lt of the working conditions that burner was expo e t . Due to high temperatures that can reach up to 850 °C and " xplosion" during gas burning, a crack may appear on the inner side f the burner. The base mat rial of the burner pipes is stainless steel X12NiCrSi35-16. Repair w lding is preceded by a series of operations, and one of them is the selection of an electrode. It turned out that inadequate selection of the electrode for repair welding had contributed to the occurrence of cracks on welded joints. Selecting a new electrode and examining its characteristics, as well as performin test w lding of pipe that is still in exploitation, had confirmed the importance of proper selection of materials for repairing of burner pipes. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers.

Keywords: burner pipe, repair welding, damages, steel X12NiCrSi35-16;

© 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.: / E-mail address: brdjordjevic@mas.bg.ac.rs * Correspon ing author. T l.: / E-mail address: brdjordjevic@mas.bg.ac.rs

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2018 Th Authors. Published by Elsevie 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.2018.12.067