PSI - Issue 10

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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 Structu al Integrity 1 (2018) 235–242 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 il l li i i

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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 Experimental research on EDM of AISI O1 tool steel and study of the surface white layer formation E.L. Papazoglou, A.P. Markopoulos*, D.E. Manolakos National Technical University of Athens, School of Mechanical Engineering, Section of Manufacturing Technology, Heroon Polytechniou 9, 15780, Athens, Greece Abstract Electrical discharge achining is a thermoel ctrical non-conventional machining process, which uses recurring sparks in order t remove material from the workpiece. The amount of the discharged energy per pulse and the combination of the machining parameters have a strong influence on machining performance, affecting the material removal rate, the surface roughness (Ra, Rt), and the formation of an amorphic material layer (white layer) at the top of the machining surface. The current paper, through an experimental procedure, investigates those correlations and proposes semi-empirical relations to describe them, for discharged pulse energies greater than 2 mJ, workpiece material AISI O1 worksteel, and copper working electrode. Beside the calculation and evaluation of the machining performance parameters, microscopic observations of the white layer were carried out to determine its quality and morphology and how it is affected by the amount of the discharge energy. © 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 Keywords: Electrical discharge machining; AISI O1 work steel; material removal ratio; white layer; microscope observations , , , , , , e o hining ce mat worksteel, a copper working electrode. Beside the calculation and e ions o its quality and morphology and how it is affected by the amou 8 The Authors. Published by Elsevier Ltd. r st ional Confer

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Material science and technology are rapidly moving forward, by developing new alloys with continually increasing mechanical and thermal properties like strength, hardness, toughness and heat resistance. At the same time, the need mechanical and thermal properties like strength, hardness, toughness and hea

* Corresponding author. Tel.: +30 210 7724299; fax: +30 210 7724273. E-mail address: amark@mail.ntua.gr Received: March 30, 2018; Received in revised form: July 13, 2018; Accepted: July 22, 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.2018.09.033 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

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