PSI- Issue 9

ScienceDirect Available online at www.sciencedirect.com Available online at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 9 (2018) 279–286 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity 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 Auth rs. Published by Els vier B.V. Peer-review und r responsibility of the Gruppo Italiano Fr ttura (IGF) ExCo. IGF Workshop “Fracture and Structural Integrity” Effect of temperature and exploitation time on tensile properties and plain strain fracture toughness, K Ic , in a welded joint Ivica Čamagić a , Simon Sedmak b * , Aleksandar Sedmak c , Zijah Burzić d , Mladen Marsenić a a Faculty of Techn cal Sciences, 7 Kneza Miloša Street, 38220 K. Mitrovica, Serbia b Innovation Center of the Faculty of Mechanical Engineering, 16 Kraljice Marije Street, 11120 Belgrade, Serbia c Faculty of Mechanical Engineering, 16 Kraljice Marije Street, 11120 Belgrade, Serbia d Military Technical Institute, 2 Ratka Resanovi ć a Street, 11000 B lgrade, Serbia Abstract Effect of temperature and exploitation time on resistance to brittle fracture of welded joint constituents of new and 40 years exploited low-alloyed Cr-Mo steel A -387 Gr . B has been analysed. The plane strain fracture toughness is used as the measure of resistance to brittle fracture of base metal, weld metal and heat affected zone from both new and exploited. The stress-strain curves have been determined as well, to get better inside in welded joint behavior. Comparison of the results indicate detrimental effect of both temperature and exploitation time, both for tensile properties and for the resistance to brittle fracture. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: welded joint; tensile properties; plane strain fracture toighness; critical crack length 1. Introduction A long-time exploitation period of a pressure vessel-reactor (over 40 years) has caused certain damages to the reactor mantle. The occurrence of these damages required a thorough inspection of the reactor construction itself, as well as the repair of damaged parts. Repairing of the reactor included the replacement of a part of the reactor mantle with newly built-in material. The pressure vessel was made of low-alloyed Cr-Mo steel A-387 Gr. B in accordance IGF Workshop “Fracture and Structural Integrity” Effect of temperature and exploitation time on tensile properties and plain strain fracture toughness, K Ic , in a welded joint Ivica Ča agić a , Simon Sedmak b * , Aleksandar Sedmak c , Zijah Burzić d , Mladen Marsenić a a Faculty of Technical Sciences, 7 K eza Miloša Street, 38220 K. Mi ovica, Serbia b Innovation Center of the Faculty of Mechanical Engineering, 16 Kraljic Marije Stre t, 11120 Belgrade, Serbia c Faculty of M anical Engin ering, 16 Kraljice M rije S reet, 11120 Belgrad , Serbia d Military Technical Institute, 2 Ratka Resanovi ć a Street, 11000 Belgrade, Serbia Abstract Effect of temperature and exploitation time on resistance to brittle fracture of welded joint constituents of new and 40 years exploited low-alloyed Cr-Mo steel A -387 Gr . B has been analysed. The plane strain fracture toughness is us d as the measure of resistance to brittle fracture of base metal, weld metal and heat affected zone from both new and exploited. The stress-strain curves have been determined as well, to get better inside in welded joint behavior. Comparison of the results indicate detrimental effect of both temperature and exploitation time, both for tensile properties and for the resistance to brittle fracture. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: welded joint; tensile properties; plane strain fracture toighness; critical crack length 1. Introduction A long-time exploitation period of a pressure vessel-reactor (over 40 years) has caused certain damages to the reactor mantle. The occurrence f these damages required a thorough inspection of the reactor construction itself, as ell as the repair of damaged parts. Repairing of the reactor included the replacement of a part of the reactor mantle with newly built-in material. The pressure vessel was made of low-alloyed Cr-Mo steel A-387 Gr. B in accordance © 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 E-mail address: simon.sedmak@yahoo.com * Correspon ing auth r E-mail address: simon.sedmak@yahoo.com

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 Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2018.06.034 * 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 Gruppo Italiano Frattura (IGF) ExCo. 2452-3216© 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.