PSI - Issue 12

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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. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. AIAS 2018 International Conference on Stress Analysis Effects of environment and stress concentration factor on Ti-6Al-4V specimens subjected to quasi-static loading S. Baragetti a,b *, E. Borzini c , E.V. Arcieri a,b a GITT – Centre on Innovation Management and Technology Tr nsfer, University of Bergamo, Via Salvecchio 19, Bergamo 24129, Italy b Department of Management, Information and Production Engineering, University of Bergamo, Viale Marconi 5, Dalmine 24044, Italy c Machine Designer, Via Lagrange 26, Novara 28100, Italy Abstract The bimodal titanium alloy Ti-6Al-4V is a well-known high strength-to-mass ratio material in different engineering sectors. Furthermore, the rapid oxidation of the surface protects the base material from the interaction with a wide spectrum of corrosive environments. However, the presence of surface defects and the mechanical loading may compromise the effectiveness of the oxide film. Quasi-static loading tests were carried out on different smooth and notched Ti-6Al-4V specimens in order to analyze the role of environment and stress concentration factor. © 2018 The Authors. Published by Elsevier B.V. This is n open access arti le und r the CC BY-NC-ND licens (http://crea ivecommons.org/licenses/by-nc-nd/3.0/) Peer-revi w under responsibility of th Scientific Committee of AIAS 2018 Int rnational Conference on Stress Analysis. Keywords: Ti-6Al-4V, quasi-st tic loading test, notch sensitivity, aggressiv environment 1. Introduction As stated in Lutjering et al. (2007), Ti-6Al-4V is one of the most widespread high strength-to-mass ratio alloy in aerospace, automotive and marine advanced applications. Furthermore, Dimah et al. (2012) pointed out that this alloy is widespread in biomedical fields thanks to its biocompatibility and encouraging interaction with the body environment w il Gurrappa (2003) underlined the high resistance to a huge spectrum of corrosive environments due AIAS 2018 International Conference on Stress Analysis Effects of environment and stress concentration factor on Ti-6Al-4V specim ns subjected to quasi-static loading S. Baragetti a,b *, E. Borzini c , E.V. Arcieri a,b a GITT – Centre on Innovation Management and Technology Transfer, University of Bergamo, Via Salvecchio 19, Bergamo 24129, Italy b Department of Management, Information and Production Engineering, University of Bergamo, Viale Marc ni 5, Dalmine 044, It l c Machine Designer, Via Lagra e 26, Novara 28100, Italy Abstract The bimodal titanium alloy Ti-6Al-4V is a well-known high strength-to-mass ratio material in different engineering sectors. Further ore, the rapid oxidation of the surface protects the base material from the interaction with a wide spectrum of corrosive environ ents. However, the presence of surface defects and the mechanical loading may compromise the effectiveness of the oxide film. Quasi-static loading tests were carried out on different smooth and notched Ti-6Al-4V specimens in order to analyze the role of environment and stress concentration factor. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. Keywords: Ti-6Al-4V, quasi-static loading test, notch sensitivity, aggressive environment 1. Introduction As stated in Lutjering et al. (2007), Ti-6Al-4V is one of the most widespread high strength-to-mass ratio alloy in aerospace, automotive and marine advanced applications. Furthermore, Dimah et al. (2012) pointed out that this alloy is widespr ad in biomedical fields thanks to its bioc mpatibility and encouraging interaction with the body environment while Gurrappa (2003) underlined the high resistance to a huge spectrum of corrosive environments due © 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.: +39-035-205-2382; fax: +39-035-205-2221. E-mail address: sergio.baragetti@unibg.it * Corresponding author. Tel.: +39-035-205-2382; fax: +39-035-205-2221. E-mail address: sergio.baragetti@unibg.it

2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-revi w u er responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review u der responsibility of t Scientific ommitt e of AIAS 2018 Internati al Conference on Stress Analysis.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt

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. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. 10.1016/j.prostr.2018.11.097