PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1362–1366 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t gri y 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 f the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Shock interaction of elements of the system "Striker - Gasket - Reinforced concrete beam" I.N. Shardakov a *, A.P. Shestakov a , К.V. Sobyanin a , I.O. Glot a a Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm, N614013, Russian Federation Abstract Results obtained in this study are related to shock-wave vibrodiagnostics of reinforced concrete structures. The paper focuses on vibrodiagnostics procedure which causes no inelastic deformation in examined structure. The objective is to find local impact parameters for excitation of mechanical oscillations of a desired spectrum in th structure and to excite an elastic wave with required wavefront characteristics. Based on results of a numerical experiment performed on the basis of a mathematical model of dynamic elastic interaction of elements of "striker – gasket – reinforced concrete beam" system the duration of the impulse action on the beam was determined depending on various factors. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: concrete, vibration diagnostics, shock-wave method, elastisity 1. Introduction Reinforced concrete is one of the most widely used building materials. The safety of reinforced concrete structures is mainly determined by their deformation state. Today automatic deformation monitoring systems is commonly used to ensure structural safety of buildings and natural objects, Carpinteri and Lacidogna (2002), Tsvetkov et al. (2013); Shardakov et al. (2014). The results presented in this article refer to the shock-wave vibrodiagnostics of reinforced concrete structures, Bykov et al (2015). Here the emphasis is placed on the vibration diagnostics i a "sparing mode", which implies that the force action on the structure during the diagnostics does not cause inelastic deformation in the elements of the ECF22 - Loading and Environmental effects on Structural Integrity Shock interaction of elements of the system "Striker - Gasket - Reinforced concrete beam" I.N. Shardakov a *, A.P. Shestakov a , К.V. Sobyanin a , I.O. Glot a a Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm, N614013, Russian Federation Abstract Results obtained in this study are related to shock-wave vibrodiagnostics of reinforced concrete structures. The paper focuses on vibrodiagnostics procedure w ich causes o inelastic deformat n in exami ed structur . The objective is to f nd local impact parameters for excitation of me anical oscillations of a desired spectru i the structure and to excite an elastic wave with requir d wavefront characteristics. Based on results f numerical experiment performed on the basis of a mathem tical model of dynamic elastic interaction of elements of "striker – gasket – reinforced concr te beam" system the dur tion of the impulse actio on th beam was determin d depending on various factors. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: concrete, vibration diagnostics, shock-wave method, elastisity 1. Introduction Reinforced concrete is one of the most widely used building materials. The safety of reinforced concrete structures is mainly determined by their deformation state. Today automatic deformation monitoring systems is commonly used to ensure structural safety of buildings and natural objects, Carpinteri and Lacidogna (2002), Tsvetkov et al. (2013); Shardakov et al. (2014). The results pres nted n this article refer to the shock-wave vibrodiagnostics of reinforced concrete structures, Bykov et al (2015). Here the emphasis is placed on the vibration diagnostics in a "sparing mode", which implies that the force action on the structure during the diagnostics does not cause inelastic deformation in the elements of the © 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 organizers. * Corresponding author. Tel.: +7-342-2378318; fax: +7-342-437-8487.. E-mail address: shardakov@icmm.ru * Corresponding author. Tel.: +7-342-2378318; fax: +7-342-437-8487.. E-mail ad ress: shardakov@icmm.ru

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.2018.12.285