PSI - Issue 6

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 6 (2017) 309–315 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. Copyright © 2017 The Authors. Published by Elsevier B.V. Peer-review 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) Multiscale finite element modeling of nonlinear behavior of polycrystalline piezoceramics with account of tetragonal and rhombohedral p ases Pudeleva Olga a *, Semenov Artem a , Melnikov Boris b a Institute of Applied Mathematics and Mechanics, Peter the Great St. Petersburg Polytechnic University, St. Petersburg 195251, Russia b Institute of Civil Engineering, Peter the Great St. Petersburg Polytechnic University, St. Petersburg 195251, Russia Abstract The nonlinear behavior of a polycrystalline piezoceramic materials based on the two-level finite element homogenization method was investigated. Numerical experiments were carried out for rhombohedral and mixed (tetragonal-rhombohedral) variants within a single crystal using a micromechanical model of the material. Based on the results of numerical experiments, the remanent part of the free energy accounting dependence of the saturation strain on the type of the multiaxial deformed state was constructed. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th MCM 2017 organizers. Keywords: er oel ctrisity/ferroelasticity; piezocer mic; strain saturatio ;finite element homogenizati n; c nstitutive behavio ; phen m nological model XXVII International Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Multiscale finit element modeling of nonlinear behavior f polycrystalline piezoceramics with account of tetragonal and rhombohedral phases Pudeleva Olga a *, Semenov Artem a , Melnikov Boris b a Institute of Appli d Mathematics and Mechanics, Pet r the Gr at St. Petersburg Polytechnic University, St. Petersburg 195251, Russia b Institute of Civil Engineer g, Peter the Great St. Petersburg Polytechnic Univ rsity, St. Petersburg 19525 , Russia Abstract The nonlinear behavior of a polycrystalline pi zoceramic ma erials based on the two-level finit element homogenization method as investigat d. Numerical experiments were carried ut for rhombohedral and mixed (tetrago al-rhombohed al) variants withi a single crystal usi g a mi romechanical mod l of the material. B sed on the resul s of numerical experimen s, the remanen part of the free energy accounting dependence of the saturation strain on the type of the multiaxial deformed state was constructed. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review und r responsibility of the MCM 2017 organizers. Keywords: ferroelectrisity/ferroelasticity; piezoceramic; strain saturation;finite element homogenization; constitutive behavior; p enomenological model

© 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.: +7-921-383-66-71. E-mail address: olga.pudeleva@yandex.ru * Correspon ing author. Tel.: +7-921-383-66-71. E-mail address: olga.pudeleva@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.2017.11.047