PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3459–3466 Available online at www.sciencedirect.com Sci nceDirect 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 Interfacial fracture of thin elastic layers due to cyclic load Elena Torskaya a *, Alexey Mezrin a a Ishlinsky Institute for Problems in Mechanics of RAS,Vernadskogo prosp. 101-1, Moscow, 119526, Moscow, Russia Abstract Fracture of thin surface layers, which are harder or softer than the substrate material, is considered for the case of cyclic sliding contact. The study is based on modeling of multiple and single contact of two-layered elastic half-space, identification of elastic properties of the surface layers from dentation results, theoretical a d experim ntal study of relatively hard coat ngs delamination due to contact fatigue, which arises at the level of asperities. The parameters of damage accumulation law at the coating-substrate interface for two component oxide coating are estimated. The properties of relatively soft coatings, which arises during friction of aluminium alloys because of soft faze extrusion are obtained from indentation data. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Surface layers, contact problem, contact fatigue, indentation, friction tests 1. Introduction The paper is devot d to frac ure of thin surface lay rs in cycled friction contact. Mechanical properti s of the layers differ from the properti s of the substrat . Such layers ca be deposited to improve friction or wear resistance, or can appear during the friction process for the case of materials with the properties of self-lubrication. Two types of non-uniform bodies are under consideration. Coatings deposition is one of the widespread methods to improve tribological properties of friction joints (Holmberg and Matthews (2009)). Thin surface layers with specific properties can be also obtained during the friction contact because of self-lubrication effect, such materials are used when standard lubrication is impossible (Bushe et al. (2003)). Here we consider thin (up to 400nm) nano-structural coatings based on multi-component oxides composed in different proportions. The materials are characterized by high resistance to heating and the coatings have good 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Interfacial fracture of thin elastic layers due to cyclic load Elena Torskaya a *, Alexey Mezrin a a Ishlinsky Institute for Problems in Mechanics of RAS,Vernadskogo prosp. 101-1, Moscow, 119526, Moscow, Russia Abstract Fracture of thin surface layers, which are harder or softer than the substrate material, is considered for the case of cyclic sliding contact. The study is based on modeling of multiple and single contact of two-layered elastic half-space, identification of elastic proper ies of the surf c layers from indentation results, theoretical and experim ntal study of relatively hard coatings delamination due to contact fatigue, which a ises at th level of asperities. Th ra ter f damage accumulation law a the coating-substrat interface for two component oxide coating are es imated. The properti s of relatively soft oatings, which rises during friction of aluminium alloys becaus of soft faze extrusion are obtained from ind ntation data. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: Surface layers, contact problem, contact fatigue, indentation, friction tests 1. Introduction The paper is devoted to fracture of thin surface layers in cycled friction contact. Mechanical properties o the lay rs differ fr m the properti s f the substrate. Such layers can b epos t d t improve friction or w ar resistance, or can app ar during the fric on pr c ss for the case of materi ls with the properties of s l -lubrication. Two types of non-uniform bodies are under consideration. Coat ngs de osition i ne of the widespread methods to improve tribological properties of friction j ints (Holmberg a d Matthews (2009)). T in surface layers with specific properties can be also obtained during the fricti n contact because of self-lubrication effect, such materials ar used when stand rd lubrication s impossible (Bushe et al. (2003)). Here e consider thin (up o 400nm) nano-structural coatings based on multi-component oxides composed in different prop rt ons. The materials are ch racte ized by high resistance to heating and the coatings have good 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.: +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. * Corresponding author. Tel.: +7-495-434-3692; fax: +7-499-7399531. E-mail address: torskaya@mail.ru * Corresponding author. Tel.: +7-495-434-3692; fax: +7-499-7399531. E-mail address: torskaya@mail.ru

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.2016.06.431