PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 2283–229 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Temperature and moisture effects on the failure mode of highly shrinkable raw catalyst supports Fouzia Achchaq a, *, Wahbi Jomaa a , Alexandre Godin a , Stéphanie Bontemps a , Je n-Rodolphe Puiggali a a Université de Bordeaux, Institut de Mécanique et d'Ingénierie I2M, Esplanade des Arts et Métiers, 33405 Talence, France Abstract Shrinkage implies generally the development of mechanical stresses and then, the formation of cracks. In this work, four formulations of alumina based hydrogels underwent a standard experimental procedure involving drying and mechanical characterizations. The thermo-hydro-mechanical behaviour of such highly shrinkable hydrogels is analysed by determining their specific surface area, calculated from the desorption isotherms. Brazilian test allowed identifying the cracking stress of the four hydrogel formulations, and the ultimate tensile strength as a function of the water content was obtained for each of them. During the drying experiments inside a convective dryer, two formulations of hydrogels displayed a capacity for self-healing. The results showed a real improvement of the strength property due to the self-repair phenomenon when it occured, proving the importance of taking into account the roles of residual water and of applied temperature conditions in the drying process of the catalyst support production line. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibil ty of the Scientific Committee of ECF21. q a, ahbi Jomaa a in a ps a -Ro a ns of hydrogels display to the self-repair phenomenon when impor Peer-review und r resp 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.

Keywords: Raw hydrogels ; rupture stress ; Brazilian test ;

© 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.: +33-5-56-84-54-02; fax: +33-5-56-84-54-36. E-mail address: fouzia.achchaq@u-bordeaux.fr

* 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.2016.06.286