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) 42 –423 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity 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 the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Crack growth resistance of weldment constituents Emina Dzindo a *, Simon Sedmak a , Zoran Radakovic b , Ivana Cvetkovic a a Innovation Centar of the Faculty of Mechanical Egineering, Belgrade, Kraljice Marije 16, 11120 Belgrade, Serbia b Faculty of Mechanical Egineering, University of Belgrade, Kraljice Marije 16, 11120 Belgrade, Serbia Abstract The overmatching can affect the occurrence of cold cracks after welding in high-strength low-alloyed steels of 770 MPa yield strength class. The welding consumable has been designed in a way to produce WM with slightly lower strength properties compared to BM (undermatching effect). The application of high-strength low-alloyed steel SUMITEN 80P, required a large scope of testing for stimation of behavior of welded joints under different loading conditions, in order to give the relia le estimation of penstock safety. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: triaxiality; Crack; HAZ; welded joint. 1. Introduction As it is known, cracks in welded joint cannot be excluded, but the influence of crack growth should be analyzed wh n considering construction safety. In assessing the load of the structure with a crack, the data about the crack behavior in its spr ad through the materi l structure, and through i s welded joint are ne ded, Omar et al. (2004). Contemporary tr ctural steels have improved mechanical properties compared to conventional steel, which is achieved by the usage of new findings in the field of steel production (the grain refinement, micro alloying, thermo mechanical processing). Today welded constructions are successfully made of steel with yield strength of 700 MPa or more. The usage of steel with high strength for welded structures is a result of satisfactory solutions to problems that occur in their welding, Burdekin and Stone (1966). ECF22 - Loading and Environmental effects on Structural Integrity Crack growth resistance of weldment constituents Emina Dzindo a *, Simon Sedmak a , Zoran Radakovic b , Ivana Cvetkovic a a Innovation Centar of the Faculty of Mechanical Egineering, Belgrade, Kraljice Marije 16, 11120 Belgrade, Serbia b Faculty of Mechanic l Egineering, U versity of Bel rade, Kraljice Marije 16, 11 20 Belgrad , Serbia Abstract The overmatching can affect the occurrence of cold cracks after welding in high-strength low-alloyed steels of 770 MPa yield strength class. The welding consumable has been designed in a way to produce WM with slightly lower strength properties compared to BM (undermatchi g effect). The application of high-strength low-alloyed steel SUMITEN 80P, required a large scope of testing for esti tion of behavior of welded joints under different lo ding conditions, in order to give the reli bl estimation of p nstock safety. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: triaxiality; Crack; HAZ; welded joint. 1. Introduction As it is known, cracks in welded joint cannot be ex lud , but the influence f crack growth should be analyzed when considering construction safety. I assessing the load of the structure with a crack, the data about the crack behavior in its spread through the material structure, and through its weld d joint are need d, Omar et al. (2004). Contemporary structural steels have improved mecha ical pro erties compared to conventional steel, which is achieved by the usage of new findings in the field of steel production (the grain refinement, micro alloying, thermo mechanical processing). Today welded constructions are successfully made of steel with yield strength of 700 MPa or more. The usage of steel with high stre gth for welded structures is a result of satisfactory solutions to problems that occur in their welding, Burdekin and Stone (1966). © 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.: +381 62 295 456 E-mail address: edzindo@mas.bg.ac.rs * Corresponding author. Tel.: +381 62 295 456 E-mail ad ress: edzindo@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.2018.12.070