PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1359–1361 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Relation between structure of metallic materials and fracture properties under conditions of solid particle erosion S.A. Atroshenko a,b* , A.D. Evst feev b , Yu.V. Petrov a,b a IPME RAS, V.O., Bolshoy, 61, St.Petersburg, 199178, Russia b SPbSU, Universitetskaya Embankment, 7/9, St.-Petersburg,199034, Russia Abstract The fraction of the ductile component of the fracture surface after solid particle erosion for different materials was investigated. The minimum amount of viscous fracture on the fracture surface was observed in aluminum samples with the FCC lattice and very high stacking fault energy, and the maximum was found in copper samples with th same FCC lattice but small stacking fault energy. The percentage of viscous fracture in BCC steel samples is close in magnitude to titanium alloy with HCP + BCC lattice and they occupy an intermediate position between copper and aluminum samples. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Metallic materials, fracture properties, erosion; * Corresponding author. E-mail address: satroshe@mail.ru 1. Introduction H The reliability and efficiency of modern equipment operating under aggressive erosion conditions depend on the quality of t e surface of metals and alloys. Some parts of jet engines, nuclear reactors, steam turbines, and boilers have usually been subjected to intense erosive action. The surface damage of materials occurs due to the flow of solid, liquid, or gaseous particles or as a result of electrical discharges. Impacts caused by the flow of finest particles lead to the damage of the surface layer of the metal. Plastic deformations of metals are interesting as they influence the mechanical properties of the material which, in turn, are of great importance in both production and operation processes. The mechanism of plastic deformation in close-packed lattice is related to the value of the stacking-fault energy (SFE). The SFE is the energy change upon a fault in the stacking of the close-packed atomic layers of the bulk structure. A stacking-fault rearranges the close-packed layers in a lattice and, thus, changes the total energy of the crystal. This energy change is defined as the stacking-fault energy (SFE), which is a material property on a very small ECF22 - Loading and Environmental effects on Structural Integrity Relation between structure of metallic materials and fracture properties under conditions of solid particle erosion S.A. Atroshenko a,b* , A.D. Evstifeev b , Yu.V. Petrov a,b a IPME RAS, V.O., Bolshoy, 61, St.Petersburg, 199178, Russia b SPbSU, Universitetskaya Embankment, 7/9, St.-Petersburg,199034, Russia Abstract The fraction of the ductile component of the fracture surface after solid particle erosion for different materials was investigated. minimum amount of viscous fr cture on the fracture surface wa observed in aluminum samples with the FCC lattice and v ry high stacking fault energy, and the maximum was found in opper samples with the sa e FCC lattice but small stacki g fault energy. The percentag of viscous fracture in BCC steel samples is close in magnitude to titanium lloy with HCP + BCC lattice a d they occupy a int rmediate position between copper nd aluminum samples. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Metallic materials, fracture properties, erosion; * Corresponding author. E-mail address: s troshe@mail.ru 1. In roduction H The reliability a d efficiency of modern equipment operating under aggressive erosion conditions depend on the quality of the surface of metals and alloys. Some parts of jet engines, nuclear reactors, steam turbines, and boilers have usually been subjected to intense erosive action. The surface damage of materials occurs due to the flow of solid, liquid, or gaseous particles or as a result of electrical discharges. Impacts caused by the flow of finest particles lead to the damage of the surface layer of the metal. Plastic deformations of metals are interesting as they influence the mechanical properties of the material which, in turn, are of great importance in both production and operation processes. The mechanism of plastic deformation in close-packed lattice is related to the value of the stacking-fault energy (SFE). The SFE is the energy change upon a fault in the stacking of the close-packed atomic layers of the bulk structure. A stacking-fault rearranges the close-packed layers in a lattice and, thus, changes the total energy of the crystal. This energy change is defined as the stacking-fault energy (SFE), which is a material property on a very small © 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 The 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 r sponsibility of the ECF22 o ganizers.

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.2018.12.284