PSI - Issue 2_A

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com S ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3721–3726 ScienceDire t Structural Integrity Procedia 00 (2016) 000 – 000 ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com

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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 Failure of materials on the postcritical deformation stage at different types of the stress-strain state Tretyakov M.P. a *, Wildemann V.E. a , Lomakin E.V. a a Center of Experimental Mechanics, Perm National Research Polytechnic University, 29, Komsomolskiy Ave., Perm, 614990, Russia Abstract Work is devoted to experimental study of the behavior of structural steels on the postcritical deformation stage at different types of the stress-strain state. Postcritical deformation stage of materials connected to the structural failure and fracturing processes and reflected on the strain curve as a descending section. Experimental and theoretical investigation of the postcritical deformation stage is very important for different materials, especially for heterogeneous materials, and necessary for forecasting of the behavior of materials in emergency cases and failure processes propagation. Realization of the postcritical deformation stage allows using of the reserves f load-carrying ability, increase vitality and safety of the ef rmable systems. Results of uniaxial te sion, proportional tension with torsion and complex tension-torsion loading is carried out. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: postcritical deformation stage, complex stress state, complex loading, tension-torsion tests, loading system stiffness, failure conditions, steels. This work is devoted to developing of s ientific foundations of the prediction, risk assessment and accident prevention related to accumulation of structural damages of materials on the postcritical deformation stage and formation the conditions of loss of load-carrying capacity of the critical structural elements [Vildeman et al. (1992, 1997), Sokolkin (1993)]. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Failure of materials on the postcritical deformation stage at different types of the stress-strain state Tretyakov M.P. a *, Wildemann V.E. a , Lomakin E.V. a a Center of Experimental Mechanics, Perm National Research Polytechnic University, 29, Komsomolskiy Ave., Perm, 614990, Russia Abstract Work is devoted to experimental study of the behavior of structural steels on the postcritical deformation stage at different types of the stress-s rain state. Postcritical ef rmation stage of materials connected to the truc ur l failure nd fracturing proc sses and reflected on the strain curve as a descending section. Experimental and theoretical investigation of the postcritical deformation stage is very import t for different materials, especially for heterogeneous mat r als, and necessary for forecasting of the beh vi r of mate ials in emergency cas s and f ilure proc sses pr pagation. R alization of the postcritic l deformation stage allows using the eserves of load-carrying ability, inc ease vitality and safety of the de ormable systems. Resul s of uniaxial tension, propo tional t nsion with torsion and complex tension-torsio loading is carrie out. © 2016 The Aut rs. Publish d by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: postcritical deformation stage, complex stress state, complex loading, tension-torsion tests, loading system stiffness, failure conditions, steels. 1. Introduction This work is devoted to developing of scientific foundations of the prediction, risk assessment and accident prev ntion elate to accumulation of structural damages of materials on the p stc tical d forma io st ge a d formation th condi ions of loss f l ad-carrying capacity of the crit cal structural elements [Vilde an et al. (1992, 1997), Sokolkin (1993)]. 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. 1. Introduction

* 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. * Corresponding author. Tel.: +7-342-239-1111; fax: +7-342-239-1224. E-mail address: cem_tretyakov@mail.ru 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +7-342-239-1111; fax: +7-342-239-1224. E-mail address: cem_tretyakov@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.2016.06.462