PSI - Issue 2_B

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ScienceDirect

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 64 –647 Structural Integrity Procedia 00 (2016) 000–000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 Numerical examinations of different plastic material models on crack growth behaviour under elevated temperature M. Paarmann*, M. Sander Institute of Structural Mechanics, Albert-Einstein-Straße 2, 18059 Rostock, Germany Abstract In the future, the energy supply will strongly fluctuate, which results in more frequently load cycles. For this reason, it is necessary to analyse fatigue crack growth under the aspect of reasonable load cases in relevant components not only under linear elastic, but also under elastic-plastic material behaviour. To obtain feasible results, it is necessary to explain the stress-strain relation of the used material correctly. Therefore, the Chaboche and the Ohno-Wang model are evaluated. The first step was to determine model parameters based on results from cyclic tensile tests for an exemplary temperature of T = 400°C. Those parameters were verified in FE-simulations with ABAQUS. For strain-controlled simulations the determined parameters of the Chaboche and Ohno-Wang model result in small deviations between numerical and experimental stresses. Next to strain controlled, stress-controlled simulations were performed. Although the Chaboche model is adapted for strain-controlled simulations, ratchetting behaviour is not well mapped by this model. Alternatively, usage of the Ohno-Wang model leads to a good simulation of ratchetting behaviour. For calculating J -Integrals of cracked components of power plants afterwards, a study of different crack shapes in different simple models is performed. Results are analysed and compared in respect of the influence of different material parameters and mechanical material mechanisms. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keyw rds: elastic-plastic; Chaboche m del; Ohno-Wang model; ratchettin ; J -i tegral 1 Introduction In future, renewable energies shall surrogate fossil power stations. It results in different load cases and more loading cycles than it was considered, when power plants were constructed. For this reason, it is necessary to o o g n surrogate fossil power stations. It results in different load cases and more 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.

* Corresponding author. Tel.: +49-381-498-9020; fax: +49-381-498-9342. E-mail address: maria.paarmann@uni-rostock.de

* 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.

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.2016.06.083