PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1267–1274 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Comparison between a ne al model and a thermographic model in estimating the thickness of scale in water pipes A. Saifi a , A. El-amiri a , H.halloua a , A. Elhassnaoui b , S. Sahnoun a *,Y.Errami a , A.Obbadi a a Laboratory of Electronics, Instrumentation and Energetic, Faculty of Sciences, B.P 20.24000 El Jadida, Morocco . b Industrial Engineering Laboratory, Faculty of Science and Technology, BP: 523 BeniMellal, Morocco. Abstract Cra ks in metallic structures used in nuclear power plants may occur because to their continuous operation. To avoid accidents that will have serious consequences for the environment it is necessary to carry out non-destructive tests in the context of preventive maintenance. In this work, we present a simulation based on the 3D finite element method to detect the scale presence in a steel water pipe. We studied the effects of thickness and diameter of the pipe on the tartar detection. Then we studied the pipe thermal response as a function of scale thickness. Using the absolute thermal contrast, we made a comparison between a neural model and a thermo graphic model to estimate the scale thickness in steel water pipes. We found that the neural model results are better than the thermo graphic model. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Infrared thermography, 3D finite element ethod, scale thickness, artificial neural networks. 1. In roduction The scale is a deposit that comes from the precipitation of minerals dissolved in water under certain conditions of temperature and pressure; it is frequently encountered in water distribution pipes in various industrial and domestic sectors. The limestone deposit reduces the available inside diameter of the pipes until the complete sealing in the extreme case. Flow rate decreases as scaling progresses. This type of encrustment also reduces the heat conduction between the fluid and the pipe, which leads to a loss of thermal efficiency in the boilers or heat exchangers in the nuclear power plants, and lead to significant costs of pipe repair. i r A. Saifi A. El-a a a a a a t c l ronment it is necess ntext of ve a thermo iew under r m © 2017 The Authors. Published by Elsevier B.V. Peer-review u der r sponsibility of th Scientific Committee of ICSI 2017 © 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.: +212-661-347-441. E-mail address: ssahnoun@gmail.com

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.103 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216© 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.