PSI - Issue 10

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 Structural Integrity 1 8 59–65 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 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. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Comparison of the mechanical response of a dual-phase and a single-phase steel bar category A. Drakakaki a, *, A. Apostolopoulos b , Ch. Apostolopoulos a a Laboratory of Technology & Strength of Materials, Department of Mechanical Engineering and Aeronautics, University of Patras, Greece b PhD Civil Engineer, University of Ioannina, Greece Abstract In the current study, the effects of chloride-induced corrosion on a dual-phase and a single-phase reinforcing steel are evaluated in terms of mass loss and mechanical characteristics. Comparison of corrosion damage rates between the two types of steel, both of which have been used in real structures, indicates that they demonstrate different resistance against corrosion environments. Two different corrosion procedures were imposed on the steel bar categories, in order to achieve a satisfying correlation with the environmental conditions. Precisely, an effort was made to correlate the electrochemical corrosion method to the natural environment, by exploiting results taken from the salt spray chamber, which has already been correlated to the environment. At the same time, the differences among the two steel bar categories were analyzed, and an esti ation was made concerning their degradation in reference to their exposure to the nvironm ntal conditions. Although single phase steel recorded higher mass loss in comparison t the du phase category, the latter emonstrated higher rop under Low Cycle Fatigu tests - after corrosi n. H wever, aking into account that corrosion damage - and consequently mechanical behavior - varies according to the exposed length of steel reinforcement, many questions can be raised concerning the performance of various steel categories and existing reinforced structures as well. This is because existing regulations still do not take into consideration as a burdening factor the length of the exposed areas. © 2018 The Authors. Published by Elsevier Ltd. This is an open acc ss article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials t e © 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. Keywords: Corrosion; mechanical performance; comparison; steel bar grades

* Corresponding author. Tel.: +30 697 9755848 E-mail address: drakakaki@upatras.gr Received: May 01, 2018; Received in revised form: July 08, 2018; Accepted: July 16, 2018

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 10.1016/j.prostr.2018.09.009 2452- 3216 © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt