PSI - Issue 6

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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. Copyright © 2017 The Authors. Published by Elsevier B.V. Pe r-r view under responsibility of the MCM 2017 organizers. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Modeling of nonlinear behavior of polyrcystalline lead-free piezoceramics with a content of tetragonal, rhombohedral and orthorhombic phases under cyclic loading Sviatoslav M. Lobanov a , Artem S. Semenov a * a Peter the Great St.Petersburg Polytecnic University, Polytechnicheskaya, 29, St.Petersburg, 195251, Russia Abstract The micromechanical model proposed by analogy with crystal visco-plasticity and taking into account the volume fraction of tetragonal, rhombohedral and orthorhombic ferroelectric phases is used for the simulation of hysteresis behavior of lead-free piezoceramics. The model parameters identification is considered and discussed. The results of simulation demonstrate a good agreement with the experimental data for a wide range of cyclic electrical loading amplitudes. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: ferroelectics, lead-free, nonlinear, hysteresis, tetragonal, rhombohedral, orthorhombic, BNT, BKT, KNN 1. Introduciton Ferroelectric and ferroelastic materials are used in wide range of technical applications such as piezo-actuators, nanopositioners, controllers, sensors etc. Nowadays the most common ferroelectrics are lead zirconate-titanate and its solid solutions (PZT). Even though, usage of it should be decreased in the nearest future due to the EU government directives which restrict the usage of lead consisting materials. Consequently, an interest in lead-free ferroelectric/ferroelastic materials rises as is shown by Rödel et al. (2009). Recently it was found that at the morph tropic pha e boundary (MPB), when th re coexist two or three phases, BaTiO 3 and its solid solutions can XXVII International Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Modeling of nonline r behavior of polyrcystalline lead-f ee piezoceramics with a content of tetragonal, rhombohedral and orthorhombic phases under cyclic loading Sviatoslav M. Lobanov a , Artem S. Semenov a * a Peter the Great St.Petersburg Polytecnic University, Polytechnicheskaya, 29, St.Petersburg, 195251, Russia Abstract The micromechanic l m del proposed by analogy with crystal vis o-pl stic ty an taking into acc unt the volume fraction of tetragonal, rhombohedral and orthorhombic ferroelectri phases is used for the s m lation of hy teresis behavior of l ad-free piezoceramics. Th model paramet s identification is considered and dis uss d. The results of si ulation demonstrate a good agreement with the experimental data for a wide range of cyclic electrical loading amplitudes. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: ferroelectics, lead-free, nonlinear, hysteresis, tetragonal, rhombohedral, orthorhombic, BNT, BKT, KNN 1. In roduciton Ferroelectric and ferroelastic materials are used in wide range of technical applications such as piezo- ctuators, nanopositi ners, controllers, se sors etc. Nowadays the most common ferroelectrics are lead zirconate-titanat and its solid solutions (PZT). Even though, usage of it sh uld be decr ased in th n arest future due to the EU government directives which restrict the usage of lead consisting materials. Consequently, an interest in lead-fre ferroelectric/ferro lastic m teri ls rises as is shown by Rödel et al. (2009). Recently it was found that at the morphotropic phase boundary (MPB), when there coexist two or three phases, BaTiO 3 and its solid solutions can © 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.: +7-921-974-24-68. E-mail address: slobanov92@yandex.ru * Correspon ing author. Tel.: +7-921-974-24-68. E-mail address: slobanov92@yandex.ru

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.014