PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 524–53 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal An Engineering Predictive Approach of Kitagawa-Takahashi Diagrams of defective A356-T6 alloy considering SDAS dispersion Amal ben Ahmed a *, Anouar Nasr b , Ahmad Bahloul c , Raouf Fathallah a a Laboratoire de Mécanique, Matériaux et Procédés, Ecole Nationale d’Ingénieurs de Sousse, Université de Sousse,BP 264, Cité Er riadh, 4023 Sousse, Tunisie. b Laboratoire de Génie Mécanique(LGM), Institut préparatoire aux études d'ingénieurs de Monastir (IPEM), Université de Monastir, Avenue Ibn Eljazzar, 5019 Monastir, Tunisie, Anouar.nasr@hotmail.fr c Laboratoire de Mécanique de Sousse, Ecole Nationale d’Ingénieurs de Sousse, Université de Sousse ,BP 264, Cité Erriadh, 4023 Sousse, Tunisie.b Abstract This attempt proposes a probabilistic framework to predict the High Cycle Fatigue (HCF) behavior of A356-T6 aluminum alloy considering the modifications introduced by the microstructure heterogeneities (the Secondary Dendrite Arming Spacing (SDAS)). The proposed approach was carried out by coupling of Finite Element (FE) simulation, Defect Stress Gradient (DSG) criterion and Monte Carlo (MCS) method. A 3D FE model representing the defective material, was implemented to evaluate the A356 HCF response under different load conditions. Lemaitre- Chaboche’s model has been usedto describe the material behavior. The iso probabilistic Kitagawa-Takahashi corresponding to5%, 50% and 95% of reliability are determined.The reliability of the proposed engineering approach is verified through a comparison with experimental HCF data. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal An Engineering Predi tive Approach of Kitagawa-Takahashi Diagrams of defective A356-T6 alloy considering SDAS dispersion Amal ben Ahmed a *, Anouar Nasr b , Ahmad Bahloul c , Raouf Fathallah a a Laboratoire de Mécanique, Matériaux et Procédés, Ecole Nationale d’Ingénieurs de Sousse, Université de Sousse,BP 264, Cité Er riadh, 4023 Sousse, Tunisie. b L boratoire de Génie Mécanique(LGM), Institut préparatoire aux études d'ingénieurs de Monastir (IPEM), Université de Monastir, Avenue Ibn Eljazzar, 5019 Monastir, Tunisie, Anouar.nasr@hotmail.fr c Laboratoire de Mécanique de Sousse, Ecole Nationale d’Ingénieurs de Sousse, Université de Sousse ,BP 264, Cité Erriadh, 4023 Sousse, Tunisi .b Abstract Thi attemp prop ses a probabilistic framework to predi the High Cycle Fatigue (HCF) behavio of 356-T6 luminum alloy considering the modifications introduced by the microstruc ure het rogeneities (the Secondary Dendrite Arming Spacing (SDAS)). The proposed approach was carried out by coupling of Finite Element (FE) simul tion, Defect Str ss Gradient (DSG) criterion and Monte Carlo (MCS) meth d. A 3D FE model representing the defective mat rial, was implemented to v luat the A356 HCF response under different lo d conditions. Lemaitre- Chaboche’s model has been usedto describe the material behavior. The i o probabil stic Kitagawa-Takahashi c rresponding to5%, 50% and 95% of reliability are determined.The reliability of the proposed engineering approach is verified through a comparison with experimental HCF data. © 2017 The Authors. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 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: MCS method; Fatigue life prediction, SDAS;Kitagawa-Tkahashi Diagrams Keywords: MCS method; Fatigue life prediction, SDAS;Kitagawa-Tkahashi Diagrams

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.:+216-99-629-640. E-mail address: amalbenahmed@gmail.com * Correspon ing uthor. Tel.:+216-99-629-640. E-mail address: amalbenahmed@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.2017.07.156 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.