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 P ocedi Structural Integrity 5 (2017) 13–18 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000

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www.elsevier.com/locate/procedia 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Anisotropy and size effect in tensile mechanical properties of Al-Cu-Li 2198 alloy Theano N. Examilioti a,b *, Benjamin Klusemann a,c , Nikolai Kashaev c , Stefan Riekehr c , Josephin Enz c , Nikolaos D. Alexopoulos b a Insitute of Product and Process Innovation, Leuphana University of Lüneburg, D-21339 L ü neburg, Germany b Department of Financial Engineering, University of the Aegean, Kountourioti 41, 82 132 Chios, Greece c Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, D-21502 Geesthacht, Germany 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Anisotropy and size effect in tensile mechanical properties of Al-Cu-Li 2198 alloy Theano N. Examilioti a,b *, Benjamin Klusemann a,c , Nikolai Kashaev c , Stefan Riekehr c , Josephin Enz c , Nikola s D. Alexopoulos b a Insitute of Product and Process Innovation, Leuphana University of Lüneburg, D-21339 L ü neburg, Germany b Department of Financial Engineering, University of the Aegean, Kountourioti 41, 82 132 Chios, Greece c Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, D-21502 Geesthacht, Germany 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. The anisotropy effect on tensile mechanical properties of an Al-Cu-Li (2198) alloy with regard to thickness of the specimens under different ageing conditions was investigated. Occurring size effects between macro and micro (0.5, 3.2 and 5.0 mm thickness and 10 and 50 mm gauge length) tensile specimens was discussed. The mechanical behavior of AA2198 was examined by taking into account the experimental results from micro-flat and standard tensile specimens. Higher thickness specimens showed higher elongation at fracture values and slightly lower yield stress properties. Anisotropy seems to be higher at T3 condition, while the lowest was noticed at the peak-ageing conditio . The results showed that th micro-flat tensile specimens in T3 condi on presented slightly lower yield stress (10 MPa difference) and essentially lower elongation at fr cture values (mor than 40 % decrease), when compared with th respective of higher thicknes specimens. It was also shown that thicker (5.0 mm) specimens exhi it slightly hig r tensile ductility properties (almost 17 %) and slightly lower tensile strength properties than the respective 3.2 mm thickness specimens. There is evidence of relative difference in mechanical properties due to the rolling process in the two sheet directions (L and T directions); such anisotropy difference seems to be marginal at the peak-ageing condition. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Abstract The anisotropy effect on tensile mechanical properties of an Al-Cu-Li (2198) alloy with regard to thickness of the specimens under different ageing conditions was investigated. Occurring size effects between macro and micro (0.5, 3.2 and 5.0 mm thickness and 10 and 50 mm gauge length) tensile specimens was discussed. The mechanical behavior of AA2198 was examined by taking into account the experimental results from micro-flat and standard tensile specimens. Higher thickness specimens showed higher elongation at fracture values and slightly lower yield stress properties. Anisotropy seems to be higher at T3 condition, while the lowest was noticed at the peak-ageing condition. The results showed that the micro-flat tensile specimens in T3 condition presented slightly lower yield stress (10 MPa difference) and essentially lower elongation at fracture values (more than 40 % decrease), when compared with the respective of higher thickness specimens. It was also shown that thicker (5.0 mm) specimens exhibit slightly higher tensile ductility properties (almost 17 %) and slightly lower tensile strength properties than the respective 3.2 mm thickness specimens. There is evidence of relative difference in mechanical properties due to the rolling process in the two sheet directions (L and T directions); such anisotropy difference seems to be marginal at the peak-ageing condition. Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Com ittee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017

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

* Corresponding author. Tel.: +0030-2270-35464; fax: +0030-22710-35429. E-mail address: t.examilioti@aegean.gr

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.2017.07.052 * 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. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Corresponding author. Tel.: +0030-2270-35464; fax: +0030-22710-35429. E-mail address: t.examilioti@aegean.gr