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 Structu al Integrity 1 (2018) 333–341 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 investigation of machinability parameters in turning of CuZn39Pb3 brass alloy N.M. Vaxevanidis a, *, N.A. Fountas a , A. Koutsomichalis b , J.D. Kechagias c a School of Pedagogical and Technological Education (ASPETE), Department of Mechanical Engineering Educators, Laboratory of Manufacturing Processes and Machine Tools (LMProMaT), ASPETE Campus, GR 14121, N. Heraklion, Greece b Hellenic Air-Force Academy (HAFA), Faculty of Aerospace Studies, Dekelia Air Force Base, GR 19005, Greece c Technological Educational Institute (TEI) of Thessaly, Mechanical Engineering Department, TEI Campus, GR 41110, Larissa, Greece Abstract This paper investigates the machinability characteristics of a high-leaded Brass alloy (CuZn39Pb3) by considering the effect of rotational speed; feed rate and depth of cut on main cutting force Fc , arithmetic surface roughness Ra and maximum height of profile Rt during its longitudinally turning. An L18 mixed-level Taguchi Orthogonal Array experimental design was established so as to systematically examine the effect of machining conditions on the aforementioned responses. Full quadratic regression models were developed for correlating the experimental and fitted data after the statistical analysis for studying the significance of the cutting conditions to main cutting force Fc , arithmetic surface roughness Ra and maximum height of profile Rt . Experimental results have shown that depth of cut holds dominant effect of cutting force whilst its contribution equals to 73.61%. Rotational speed and feed rate have just as important effect on arithmetic surface roughness average with 38.85% and 32.15% contributions r spectively. For the maximum height of the profile, rot tional speed has a significant contribution equal to 42.38% of the overall significanc . The models cr ated can explain the investigated param ters’ variation o the percent ages of 99.44%, 97.29% and 96.76% for main cu ting f rce Fc , arithmetic urface roughness Ra nd maximum height profile Rt respectiv ly. © 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 paper i s st © 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: Surface roughn ss; cutting force; multi-parameter analysis; turning; brass alloy

* Corresponding author: Tel.: +30 210 2896841; fax: +30 210 2821095. E-mail address: vaxev@aspete.gr Received: May 28, 2018; Received in revised form: July 27, 2018; Accepted: September 03, 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.2018.09.046 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