PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 896–9 1 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Adaptation of hydrogen transport models at the polycrystal scale and application to the U-bend test Y. Charles a *, M. Gaspérini a , K. Ardon a , S. Ayadi a , S. Benannoune a , J. Mougenot a a Université Paris 13, Sorbonne Paris Cité, Laboratoire des Sciences des Procédés et des Matériaux, LSPM, CNRS, UPR 3407, 99 avenue Jean-Baptiste Clément, F-93430 Villetaneuse, France Abstract Hydrogen transport and trapping equations are implemented in a FE software, using User Subroutines, and the obtained tool is applied to get the diffusion fields in a metallic sheet submitted to a U-Bend test. Based on a submodelling process, mechanical and diffusion fields have been computed at the polycrystal scale, from which statistical evaluation of the risk of failure of the sample has been estimated. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Hydrogen diffusion, Kinetic Trapping, Finite elements calculations, Abaqus, User Subr uti e ; crystal plastici 1. Introduction The selection of material for applications in hydrogen environment (gaseous, cathodic, or even plasma) needs to account for th interactions between materials and hyd ogen atoms, nd especially th decreases of the fail re resistance (hydrogen embritt ement). Several tests, such as the disk pressure test [1,2] or the U-Bend one [3], in which metallic sheet undergo important plastic straining, are thus used to qualify materials in such context. Their specifications, however, remains mainly based on phenomenological experimental data. To get a better understanding of the link between the in-service reliability of structure and such tests, it is required to conduct numerical computations, accounting for interactions between hydrogen transport, trapping (induced by plastic deformation), and eventually, failure initiation. The pioneering work of Sofronis [4], later completed by ECF22 - Loading and Environmental effects on Structural Integrity Adaptation of hydrogen transport models at the polycrystal scale and application to the U-bend test Y. Charles a *, M. Gaspérini a , K. Ardon a , S. Ayadi a , S. Benannoune a , J. Mougenot a a Université Paris 13, Sorbonne Paris Cité, Laboratoire des Sciences des Procédés et des Matériaux, LSPM, CNRS, UPR 3407, 99 avenue Je n-B ptist Clément, F-93430 Villetan us , Fr nce Abstract Hydrogen transport and trapping equations are implemented in a FE software, using User Subroutines, and the obtained tool is applied to get the diffusion fields in a metallic sheet submitted to a U-Bend test. Based on a submodelling process, m chanical nd diffusion fields have been computed at the polycrystal scale, from which tatistical evaluation of the risk of failure of the sample has been estimated. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Hydrogen diffusion, Kin tic Trapping, Finite lements calculations, A aqus, User Subroutine ; crystal plasticity 1. Introduction The selection of material for applications in hydrogen environment (gaseous, cathodic, or even plasma) needs to account for the interact ons be we n ma erials and hydrogen atoms, and especially the dec eases of the f ilure resistanc (hydrog n embrittl ment). Several tests, such as the disk pressure test [1,2] or the U-B nd one [3], in which metallic sheet undergo i portant plastic straining, are thus used to qualify materials in such context. Their specifications, however, remains mainly based on phenomenological experimental data. To get a better understanding of the link between the in-service reliability of structure and such tests, it is required to conduct numerical computations, accounting for interactions between hydrogen transport, trapping (induced by plastic deformation), and eventually, failure initiation. The pioneering work of Sofronis [4], later completed by © 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.: +33-1-49-40-34-61 ; fax: +33-1-49-40-39-38 . E-mail address: yann.charles@univ-paris13.fr * Corresponding author. Tel.: +33-1-49-40-34-61 ; fax: +33-1-49-40-39-38 . E-mail ad ress: yann.charles@univ-paris13.fr

* 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 o ganizers.

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.2018.12.169