PSI - Issue 10

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 Structural Integrity 1 8 41–48 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 Corrosion behavior of 304L stainless steel concrete reinforcement in acid rain using fly ash as corrosion inhibitor S. Tsouli a , A.G. Lekatou a, *, S. Kleftakis a , T.E. Matikas b , P.T. Dalla b a Laboratory of Applied Metallurgy, Department of Materials Science & Engineering, University of Ioannina, Ioannina 45110, Greece b Mechanics, Smart Sensors & Nondestructive Evaluation Laboratory, Department of Materials Science & Engineering, University of Ioannina, Ioannina 45110, Greece Abstract The corrosion performance of 304L stainless steel rebars in a solution simulating concrete exposed to acid rain with the addition of fly ash was studied by means of cyclic potentiodynamic polarization. Fly ash (0-25 wt.%) was added to a concrete simulating solution. 304L rebars embedded in standard concrete cubes containing 0-25 wt.% fly ash were subjected to salt spray testing for 4 m. Tensile testing of the rebars was conducted before and after 2 m of salt spraying. Although 304L showed susceptibility to localized corrosion, the positive effect of fly ash on the corrosion behavior is clearly manifested. Fly ash content of 20 wt.% in the electrolyt led to the highest corrosion resista ce. Two mo hs of salt spraying did not affect th tensile behavior of the steel. © 2018 The Authors. Published by Elsevier Lt . This is an open access article under the CC BY-NC-ND li ense (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-rev ew under responsibility of the scientific committ e of the 1 st International Conference of the Gr ek Society of Experimental Mechanics of Materials Keywords: 304L stainless steel rebars; reinforced concrete; fly ash; acid rain; cyclic polarization; salt spray test; tensile test The ancient monuments of Greece are masterpieces of the world’s architectural heritage with immense artistic and historical value. Nowadays modern materials, such as AISI type 316L stainless steel and titanium, are widely employe in restoration works. For example, 316L stainless steel is currently used as reinforcement of ancient archi- , Gr i e e 1. Introduction © 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. 1. Introduction

* Corresponding author. Tel.: +30 26510 07309; fax: +30 26510 07034. E-mail address: alekatou@cc.uoi.gr Received: May 04, 2018; Received in revised form: July 18, 2018; Accepted: July 27, 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.2018.09.007 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 st * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt