PSI - Issue 2_A

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 2156–2163 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Fatigue life prediction of high strength steel welded joints by Energy Approach P. Corigliano, V. Crupi, G. Epasto, E. Guglielmino, G. Risitano* Department of Engineering, University of Messina, Contrada Di Dio (S. Agata), 98166 Messina, Italy Abstract Two full-field techniques were applied for the study of the base material and welded specimens, made of S690QL steel: digital image correlation and thermographic techniques. Static and fatigue tests were carrie out. The therm graphic measurements can be used to predict the fatigue, with a great saving in time and effort. Fatigue tests at increasing loads were carried out by a stepwise succession, applied to the same specimen, for applying an energy-based approach. The predictions of the fatigue life, obtained by means of the Energy Approach, were compared with the values obtained by the traditional procedure. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Thermographic Method; Energy Approach; Fatigue; S-N curve; Welded joints; High strength steel; Digital Image Correlation; Infrared Thermography 1. Introduction The infrared thermography was applied for the nalysis of different m terials u der fatigue loading: short glass fiber-r inforc d polyamide composites by Crupi et al. (2015), shape memory alloys by Maletta et al. (2014), and steels in low cycle fatigue (LCF) regime by Corigliano et al. (2015), high cycle fatigue (HCF) regime [Risitano et al. (2015), Amiri et al. (2010), Wang et al. (2012), Meneghetti et al. (2015), Curà et al. (2005), De Finis et al. (2015)] and very high cycle fatigue (VHCF) regime by Plekhov et al. (2015) and Crupi et al. (2015). The fatigue effects become even more important in presence of welded joints and the fatigue assessment of welded joints becomes more complex in presence of a multiaxial stress state as demonstrated by Susmel (2014). The literature on fatigue analysis 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Fatigue life prediction of high strength steel welded joints by Energy Approach P. Corigliano, V. Crupi, G. Epasto, E. Guglielmino, G. Risitano* Department of Engineering, University of Messina, Contrada Di Dio (S. Agata), 98166 Messina, Italy Abstract Two full-field techniques were applied for the study of the base material and welded specimens, made of S690QL steel: digital image corr lation a d thermogr hic technique . Static and f tigue t sts were carri out. Th thermographic measur ments c n be used to predict th fatigue, with a great saving in time nd effort. Fatigue tests at incre sing l ads were c rried out by a stepwise succession, applied to the same specimen, for applying an energy-based approach. The predictions of the fatig e life, obtained by m ans of the Energy Approach, were compared w th the values o tained by the traditional procedure. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: Thermographic Method; Energy Approach; Fatigue; S-N curve; Welded joints; High strength steel; Digital Image Correlation; Infrared Thermography 1. Introduction The infrared thermography was applied for the analysis of different materials under fatigue loading: short glass fiber- ei orced poly mide composites by Crupi et al. (2015), sh p memory alloys by Maletta et al. (2014), and ste ls in low cycle fatigu (LCF) regime by Corigliano et al. (2015), high cycle fatigue (HCF) regime [Risitano et al. (2015), Amiri et al. (2010), Wang et al. (2012), Me eghetti et al. (2015), Curà et al. (2005), De Finis et al. (2015)] and very high cycle fatigue (VHCF) regime by Plekhov et al. (2015) and Crupi et al. (2015). The fatigue effects become even more important in presence of welded joints and the fatigue assessment of welded joints becomes more compl x in presence of a multiaxial stress state as emonstrated by Susmel (2014). The lit rature o fatigue analysis Copyright © 2016 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/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 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.: +39 347 3209239. E-mail address: giacomo.risitano@unime.it * Corresponding author. Tel.: +39 347 3209239. E-mail ad ress: giacomo.risitano@unime.it

* 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 ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the Scientific Committee of ECF21.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 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/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.270