PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 2255–226 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 the ECF22 organizers. ECF22 - Loading and Environmental Effects on Structural Integrity Comparative Exemination of the Strengthened and Non- Strengthened NIMONIC Specimens with Laser Shot P ening Method S. Petronić a, *, K. Čolić b , B. Đorđević b , Ž. Mišković c , Đ. Katnić a , F. Vučetić c a University of Belgrade, In stitute of Nuclear Science “Vinča”, Serbia b Innovation Centre of Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120 Belgrade 35, Serbia c Faculty of Mechanical Engineering, University of Belgrade, Kraljice arije 16, 11120 Belgrade 35, Serbia Abstract Laser shot peening (LSP) of material strengthening is nowdays widely used method in various branches of industry. In this paper are presented comparative exeminations of specimen made of NIMONIC and strengthened specimen on which laser shot peening method was performed. Specimens were made as thin plates with holes. Macrostructural surface tests were performed around the specimens holes with different magnifications for both specimens as well as certain damages on the specimens. 3D images of specimens damages provide insights into the its dimensions. In addition, the roughness of non-strengthed and strengthed specimens was also performed. Hardness t sts using h Rockwell C method of both specimens show a diff rence in the h rd ess f both sam les and the main characteristics of the laser shot peeni g method. Also, the nalysis on h w th damag of sa ples could represent the location of initial cracks that could cause failure of the specimens or generally machine part is given as well. © 2018 The Authors.Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Laser shot peening; Nimonic; Macrostructural surface tests. 1. Introduction Nimonic, as a registered trademark, refers to a family of nickel-based high-temperature low creep superalloys. Nimonic alloys typically consist of more than 50% nickel and 20% chromium with additives such as titanium, aluminium etc. Nimonic alloys provide very good corrosion and oxidation resistance at very high temperatures and ECF22 - Loading and Environmental Effects on Structural Integrity Comparative Exemination of the Strengthened and Non- Strengthened NIMONIC Specimens with Laser Shot Peening Method S. Petronić a, *, K. Čolić b , B. Đorđević b , Ž. Mišković c , Đ. Katnić a , F. Vučetić c a University of Bel rad , I stitute of Nuclear Science “Vinča”, Se bia b Innovation Centre Fa ulty of Mechanical Engi eering, University of Belgrade, K aljice Marije 16, 11120 Belgrade 35, Serbia c Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120 Belgrade 35, Serbia Abstract Laser shot peening (LSP) of material strength ning is nowdays widely used method in various branches of industry. In this paper ar presented comparative xe i ations of sp cimen made of NIMONIC and strengthened specimen on which laser shot peening method was performed. Specimens were made as thin plates with holes. Macrostructural surface tests wer performed around the i holes with differe t magnification for both specimens as well as certain damages on t e specim s. 3D images of specimens damag s provide insights into the its dimensions. In addition, the roughness of non-strengthed and str ngthed specimens wa also performed. Hardness tests using the Rockwell C method of both specimen show a differenc in the hardness of both sampl s nd the main c aracteristics of the laser sho pee ng method. Als , the analysi on how the damage f amples coul repr sent the loc tion of initial cracks that could c use failure of the specimens or generally machine part is given as well. © 2018 The Authors.Published by Els vier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Laser shot peening; Nimonic; Macrostructural surface tests. 1. Introduction Nimonic, as a registered trademark, refers to a family of nickel-based high-temperature low creep super lloys. Ni o ic alloys typically c n ist f mor than 50% nickel and 20% chromium with additives such as titanium, aluminium etc. Nimonic alloys provide very good corrosion and oxidation resistance at very high temperatures and © 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 Th 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. * Corresponding author E-mail address: sanjapetronic@yahoo.com * Corresponding author E-mail address: sanjapetronic@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 ECF22 organizers. 10.1016/j.prostr.2018.12.131