PSI - Issue 10

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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 Powder metallurgy route aluminium foams: a study of the effect of powder morphology, compaction pressure and foaming temperature on t e poro s s ructure I.G. Papantoniou a, *, D.I. Pantelis b , D.E. Manolakos a a School of Mechanical Engineering, Manufacturing Technology Section, National Technical University of Athens, Greece b School of Naval Architecture and Marine Engineering, Shipbuilding Technology Laboratory, National Technical University of Athens, Greece Abstract The aim of the present research is the production of metal foams using powder metallurgy route with gas releasing particles, in order to further analyze the effect of different parameters in the foams final porosity and internal structure. The parameters examined included the powder morphology, the compaction pressure and the foaming temperature. During the foaming stage, for each set of parameters the porosity-time (P f -t) diagrams were developed and examined. Results indicate that the highest foaming efficiency ( η =P fmax ) was observed at the specimens with the fine aluminium powder, with high (700 MPa) compaction pressure and high foaming temperatures (800  C). Consequently, compression tests were performed on those foamed specimens in order to investigate their s-e response. From the experimental s-e results of the foamed specimens, average compressive strength and density were estimated and presented for comparison with existing literature results on periodic and stochastic metal foams. © 2018 The Authors. Published by Elsevier Ltd. This is an open a cess 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: Metal foam; aluminium foam; mechanical properties; porosity 1 st International Conference of the reek Society of Experi ental echanics of aterials er etall r r te al minium foams: a study of the effect f er r l , c acti ress re a f a i te erat re t e r s str ct re I.G. Papantoniou a, *, D.I. Pantelis b , .E. anolakos a a School of Mechanical Engineering, Manufacturing Technology Section, National Technical University of Athens, Greece b School of Naval Architecture and Marine Engineering, Shipbuilding Technology Laboratory, National Technical University of Athens, Greece Abstract The aim of the present research is the production of metal foams using powder metallurgy route with gas releasing particles, in order to further analyze the effect of different parameters in the foams final porosity and internal structure. The parameters examined included the powder morphology, the compaction pressure and the foaming temperature. During the foaming stage, for each set of parameters the porosity-time (P f -t) diagrams were developed and examined. Results indicate that the highest foaming efficie cy ( η =P fmax ) was observ d at the specime s with the fine aluminium powder, with high (700 MPa) c mp ction pressure and high foaming temperatures (800  C). Consequently, compression test were performed on th se foamed s cimens in ord r to inv stigate their s-e response. From the experimental s-e results of the foamed specimens, average compressive strength and density were estimated and presented for comparison with existing literature results on periodic and stochastic metal foams. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/lice ses/by-nc- d/3.0/). Peer-review un er responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Keywords: Metal foam; aluminium foam; mechanical properties; porosity

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introductio 1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. While, the modern world needs new advanced materials with unique combination of properties that allow new appli cations, microcellular materials are among a new class of materials. Microcellular materials and specifically metallic While, the modern world needs new advanced materials with unique combination of properties that allow new appli cations, microcellular materials are among a new class of materials. icrocellular materials and specifically metallic

* Corresponding author. Tel.: +30 210 7723897 E-mail address: ipapantwniou@gmail.com; ipapanto@central.ntua.gr Received: April 17, 2018; Received in revised form: July 10, 2018; Accepted: July 20, 2018 * Corresponding author. Tel.: +30 210 7723897 E-mail address: ipapantwniou@gmail.com; ipapanto@central.ntua.gr Received: April 17, 2018; Received in revised form: July 10, 2018; Accepted: July 20, 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.2018.09.034 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 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