PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3337–3344 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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 © 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy I fluence Yield Stress on Arrest Pressure in Pipe Predicted by CTOA M.Benamara a , G.Pluvinage b , J.Capelle a , Z.Azari a * a LaBPS – ENIM, 1 route d’Ars Laquenexy, CS 65820, Metz 57078, France b FM.C Silly Sur-Nied 57530, Franc Abstract In this paper, the resistance to ductile crack extension is discussed in terms CTOA. Selection of CTOA is based on the reduced number of parameters and the low sensitivity to pipe geometry. Numerical simulations of crack propagation and arrest based on CTOA use the node release technique, which is described. Results on a pipe made in steel API L ,X52, X65 and X 100 are presented. The influence material parameters on crack arrest and velocity using this technique are presented. For the same decompression wave pressure, the crack propagation velocity is inversely proportional to the resistance to crack extension of the material, which is the dominant parameter. The crack velocity versus decompression is expressed by a CTOA c function of resistance to crack extension © 2016 The Authors. Published by Elsevier B.V. Peer-revi w under responsibility of the Scientific Committee of ECF21. Keywords: CTOA; pipe steel ; cr ck arrest; cra k extension; 1. Introduction One of the objectives of the pipe design is to reduce the crack arrest length in order to repair within a reasonable cost. To solve t is pro lem, develop ng relationships are required between the decompression behaviour, arrest str ss lev l, a f acture velocity. The basic idea is to compare fracture resistance and driving force during crack extension. Immediately, when a trough crack appears at the surface of the wall of the pipeline, the gas tends to escape through the opening plug created. This leads to a sudden decompression and creation of two opposite decompression waves running at a speed 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Influence Yield Stress on Arrest Pressure in Pipe Predicted by CTOA M.Benamara a , G.Pluvinage b , J.Capelle a , Z.Azari a * a LaBPS – ENIM, 1 route d’Ars Laquenexy, CS 65820, Metz 57078, France b FM.C Silly Sur-Nied 57530, France Abstract In this paper, the resistance to ductile crack extension is discussed in terms CTOA. Selection of CTOA is based on the reduced number of parameters nd the low sensitivity to pipe geometry. Numerical simulations of crack propagation and arrest based on CTOA use the node release technique, which is described. Results on pipe made in steel API L ,X52, X65 nd X 100 are presented. T influenc ma rial parameters on crack arrest and velocity using this technique are presented. For the sam decompression wave pressure, the cr ck propagation velocity is i vers ly proportional to the resistance to crack extension of th material, which is the dominant parameter. The crack velocity us decompression is expressed by a CTOA c functi n of resistance to crack extension © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: CTOA; pipe steels; crack arrest; crack extension; 1. I troduction One of the objectives of the pipe design is to reduce the crack arrest length in order to repair within a reasonable cost. To solve th s pr blem, developing relationships are requi ed between the compression behaviour, arrest stress level, and fracture velocity. The basic idea is to compare fracture resistance and driving force during crack extension. Immediately, when a trough crack appears at the surf e of the wall of the p peline, th gas tends to escape through the opening plug created. This leads to sudden de ompression and creation of two oppo it decompression waves running at a s eed © 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. E-mail address: pluvinage@cegetel.net * Corresponding author. E-mail address: pluvinage@cegetel.net

* 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 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.2016.06.416