PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1571–1576 Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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. ECF22 - Loading and Environmental effects on Structural Integrity Analysis of dependence of internal damping on temperature of austenitic steels Milan Uhríčik a *, Monika Oravcová a , Peter Palček a , Tatiana Oršulová a , Lenka Kuchariková a , Ružica Nik olić b a University of Žilina, Faculty of Mechanical Engineering, Department of Materials Engineering, Univerzitná 8215/1, 01026 Žilin a, Slovakia b University of Žilina, Research Center, Univerzitná 8215/1, 01026 Žilina, Slovakia and Faculty of Engineering, University of Kragujevac, Serbia Abstract The processes of microplasticity and energy scattering inside the material are analyzed by measuring the internal damping. The mechanism of microplasticity can be evaluated by various dependencies – frequency, time, temperature and amplitude dependencies that characterize the kinetics of accumulation of fatigue damage under long-term load. By measuring the energy scattering in the material, the elastic characteristics, the modulus of elasticity, the degree of stress relaxation in the material can be determined. The ability of a solid to irreversibly disperse energy under mechanical stress is called the internal damping. The time required to achieve the equilibrium deformation value is determined by various processes associated with the reallocation of atoms, magnetic moments and the temperature of the solid subjected to external stresses. The internal damping mechanisms have been studied by ultrasonic resonant apparatus at a frequency close to 20450 Hz and in a temperature range from 30 °C up to 400 °C. Specimens of an hour glass shape were used for experiments. Measurement of internal damping dependence on temperature was performed on austenitic steels AISI 316L, AISI 316Ti and AISI 304, in the initial state and after the defor ation. Those materials are commercially available stainl ss steels, which are very often used as biomaterials in medicine. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: internal damping; austenitic steel; resonance frequency; temperature. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Analysis of dependence of internal damping on temperature of austenitic steels Milan Uhríčik a *, Monika Oravcová a , Peter Palček a , Tatiana Oršulová a , Lenka Kuchariková a , Ružica Nik olić b a University of Žilina, Faculty of Mechanical Engineering, Department of Materials Engineering, Univerzitná 8215/1, 01026 Žilin a, Slovakia b University of Žilina, Research Center, U verzit á 8215/1, 01026 Žili a, Slovakia and Faculty of Eng n eri g, University of Kragujevac, Serbia Abstract The processes of microplasticity and energy scattering inside the material are analyzed by measuring the internal damping. The mechanism of microplasticity can be evaluated by various dep nd ncies – frequency, time, te p rature and amplitude dependencies that characterize the kinetics of accumulation of fatigue damage und r long-term load. By easuring the energy scatt ri g i the m erial, th elas ic characteristics, the modulus o elasticity, th degr e f str ss rel xation in the material can be determi ed. T ability of a solid o irreversibly di perse energy und r me hanical stress is call d th internal damping. The time r quir d to achiev the equilibrium defo mation value is d t rmined by various proce ses as o iat with he reallocation of ato s, magn tic moments and the temperature of the solid subjec d to xternal stre ses. The internal damping m ch nisms have been tudied by ultraso ic resonant apparatus at a frequency clos to 20450 Hz nd in a temperatur range from 30 °C up to 400 °C. Sp cimens of an hour glass shape were used for exp riments. Measurement of internal da ping dependence on temperature was performed on austenitic steel AISI 316L, AISI 316Ti and AISI 304, in th initial state a d after the deformation. Thos materials are comme cially av ilable stainl s steels, which are very often used as biomat rials in m dicine. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: internal damping; austenitic steel; resonance frequency; temperature. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction Austenitic stainless steels are the most important group of corrosion-resistant metallic materials found widespread, not only in industrial, but also in medical applications. Austenitic steels are characterized by their good combination of Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Austenitic stainless steels are the most important group of corrosion-resistant metallic materials found widespread, not only in industrial, but also in medical applications. Austenitic steels are characterized by their good combination of 1. Introduction

* Corresponding author. Tel.: +421-41-513-2626. E-mail address: milan.uhricik@fstroj.uniza.sk * Corresponding author. Tel.: +421-41-513-2626. E-mail ad ress: milan.uhricik@fstroj.uniza.sk

* 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.

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.2018.12.321