PSI- Issue 9

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 9 (2018) 287–294 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Gruppo Italiano Frattura (IGF) ExCo. IGF Workshop “Fracture and Structural Integrity” Tribological properties of wear-resistant coatings obtained by cold gas dynamic spray Pietro Magarò a,b *, Angelo Luigi Marino b,c , Carmine Maletta a , Mario Tului b , Andrea Di Schino c a DIMEG, University of Calabria, P. Bucci 46C, Rende (CS) – Italy b RINA Consulting - CSM S.p.A. Zona Industriale S. Pietro Lametino, Lamezia Terme (CZ) – Italy c University of Perugia, Dept. of Engineering, Via G. Durante, Perugia – Italy Abstract The aim of this study was obtaining good deposits of stellite-6 by Cold Gas Dynamic Spray (CGDS), in terms of low porosity and good adhesion and cohesion. In fact, the high strength and melting point of the investigated alloy lead to a high value of the particle critical velocity in CGDS and, therefore, good quality results are difficult to achieve. The tribological properties of the coatings were analyzed by micro-hardness measurements and pin-on-disk wear tests. Results revealed that spraying parameters can be optimized to obtain almost pore-free coatings. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Cold Gas Dynamic Spray; Coatings; Stellite; Tribological properties 1. Introduction Cold Gas Dynamic Spray (CGDS) is a recent coating deposition technology in which solid powders, with a diameter of 5-50 µm, are accelerated towards a substrate by a supersonic gas jet. Due to their high kinetic energy, particles undergo large plastic deformation during impact with the substrate. The consequent adiabatic shear instabilities IGF Workshop “Fracture and Structural Integrity” Tribological properties of wear-resistant coatings obtained by cold gas dynamic spray Pietro Magarò a,b *, Angelo Luigi Marino b,c , Carmine Maletta a , Mario Tului b , Andrea Di Schino c a DIMEG, University of Calabria, P Bucci 46C, Re de (CS) – Italy b RINA Consulting - CSM S.p.A. Zona Industriale S. Pietro Lametino, Lam zia Terme (CZ) – Italy c University of Perugia, Dept. of Engineering, Via G. Durante, Perugia – Italy Abstract The aim of this study was obtaining good deposits of stellite-6 by C ld Gas Dy amic Spray (CGDS), in terms of low porosity and good adh sion and cohesion. In fact, the hi h strength and melting point of the investigated alloy lead to a high value of the particle critical velocity in CGDS and, therefore, good qu lity results are difficult to achieve. The tribological properties of the coatings were analyzed by micr -hardness measurements and pin-on-disk wear tests. Results revealed that spraying parameters can be optimized to obtain almost pore-free coatings. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Cold Gas Dynamic Spray; Coatings; Stellite; Tribological properties 1. Introduction Cold Gas Dynamic Spray (CGDS) is a recent coating deposition technology in which solid powders, with a diameter of 5-50 µm, are accelerated towards a substrate by a supersonic gas jet. Due to their high kinetic energy, particles undergo large plastic deformation during impact with the substrate. The consequent adiabatic shear instabilities © 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: pietro.magaro@unical.it * Correspon ing author. E-mail address: pietro.magaro@unical.it

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.2018.06.030 * 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 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.