PSI - Issue 8

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Scie ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 8 (2018) 318–331 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 © 2018 The Authors. ublished by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy LCF assessment on heat shield components of nuclear fusion experiment “Wendelstein 7 - X” by critical plane criteria V. Giannella a , R. Citarella a *, J. Fellinger b and R. Esposito a a Dept. of Industrial Engineering, University of Salerno, via G. Paolo II, 132, Fisciano (SA), Italy b Max Planck Institute for Plasma Physics, EURATOM Association, Wendelsteinstr. 1, 17491, Greifswald, Germany Abstract The Wendelstein 7-X modular advanced stellarator has started operations at the Max Planck Institute for Plasma Physics in Greifswald, Germany, in 2016. In the first phase, the machine operated restricting the plasma pulses to low power and short lengths. Plans to achieve actively cooled components are scheduled to start in 2020 when the machine will operate in steady-state at full power. FEM simulations for steady-state operations revealed high plastic strains at several locations, for most of all the rigidly supported Plasma Facing Components; therefore, there is the risk of a premature fatigue failure before the end of the scheduled operations of the machine. The aim of this study is to analyse, by means of the commercial code ABAQUS, the behavior of such critical compone ts estimating, eventually, their fatigue life by mea s of the commercial code f -safe. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: Wendelstein 7-X; FEM; Elastic-plastic behavior, Nonlinear hardening; Multiaxial fatigue; fe-safe. 1. Introduction At the Max Planck Institute for Plasma Physics, Greifswald, Germany, the world’s larg est nuclear fusion exp riment of stellarat r type, Wendelst in 7-X (W7-X, Fig. 1a), is currently in operation. The hot hydrogen plasma (torus shaped with major radius of 5.5 m and minor radius of 0.53 m) is confined in a Plasma Vessel (PV) by an AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy LCF assessment on heat shield components of nuclear fusion experiment “Wendelstein 7 - X” by critical plane criteria V. Giannella a , R. Citarella a *, J. Fellinger b and R. Esposito a a Dept. of Industrial Engineer ng University of Salerno, via G. Paolo II, 132 Fisciano (SA), Italy b Max Planck Institute for Plasma Physics, EURATOM Association, Wendelsteinstr. 1, 17491, Greifswald, Germany Abstract Th Wen elst in 7-X modular advanced stell rator has started operations at the Max Pl nck Institute for Plasma Physics in Greifswald, Germany, in 2016. In th first has , the machine operated restricting the plas a pulses to low power nd short lengths. Plans to achieve actively cool d components re scheduled to start in 2020 when the machine will operate in eady-stat at fu l power. FEM si ulations for steady-state operations r vealed high plastic strains at several locations, for most of all rigidly supported Plasma Facing Components; therefore, there is the risk of a pr mature fatigue failure befor the end of scheduled ope ations of the machine. The aim of this study i to analys , by means of the co ercial c d ABAQUS, he behavior of such critical components estimating, event ally, their fatigue life by means f the commercial code fe-safe. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: Wendelstein 7-X; FEM; Elastic-plastic behavior, Nonlinear hardening; Multiaxial fatigue; fe-safe. 1. Introduction At the Max Planck Institute for Plasma Physics, Greifswald, Germany, the world’s larg est nuclear fusion experiment of stellarat r type, Wendelstei 7-X (W7-X, Fig. 1a), is currently in operation. The hot hydrogen plasma (torus shaped with major radius of 5.5 m and minor radius of 0.53 m) is confined in a Plasma Vessel (PV) by an © 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.: +39-089-964111; fax: +39-089-964111. E-mail address: rcitarella@unisa.it * Correspon ing autho . Tel.: +39-089-964111; fax: +39-089-964111. E-mail address: rcitarella@unisa.it

2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis.

* 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 PCF 2016.

2452-3216 Copyright  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis 10.1016/j.prostr.2017.12.033