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 P o edi Structural Integr ty 1 ( 8) 3–10 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 Recent advances in structural health monitoring of restored elements of marble monuments S.K. Kourkoulis* Laboratory for Testing and Materials, Department of Mechanics, School of Applied Methematical and Physical Sciences, National Technical University of Athens, Theocaris Building, Zografou Campus, 157 73 Athens, Greece The motive of this study is the need of scientific teams working for restoration projects of masterpieces of classical Greek antiquity to accurately describe the mechanical response of complexes made of building stones and reinforcing metallic elements. The study was presented during a special session, devoted to the memory of late Professor Pericles S. Theocaris, organized in the frame of the „ 1 st International Conference of the Greek Society of Experimental Mechanics of Materials ‟, It is part of a wider project, the aim of which is, among others, to assess the efficiency of structural health monitoring tools in predicting upcoming failure. It is proven that the time evolution of the outcomes of both the „Acoustic Emissions‟ and the „Pressure Stimulated Currents‟ techniques exhibit characteris ic changes that coul be considered as warnings that the system stu ied ente s to its „critical stage‟ . © 2018 The Authors. Published by Elsevier Lt . 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 Keywords: Marble; cultural heritage; stuctural health monitoring; acoustic emissions; pressure stimulated currents The xperimental tudy of the mechanical response of restored structural members of monuments made of natural building stones (marble, porous stones, shell stones etc.) is quite difficult for a variety of reasons (like, for example, the size effect dictating the preparation of specim ns of quite large dimensions, the co-existence of incompatible, from the mechanical point of view, materials, the existence of hidden interfaces, the anisotropy and inhomogeneity of the .K © 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. Abstract 1. Introduction

* Tel.: +30 210 7721263; fax: +30 210 7721301. E-mail address: stakkour@central.ntua.gr Received: March 30, 2018; Received in revised form: June 28, 2018; Accepted: July 07, 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.2018.09.002 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 t * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt