PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 476–483 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Fracture analysis and embrittlement phenomena of machined brass components George Pantazopoulos*, Athanasios Vazdirvanidis ELKEME Hellenic Research Centre for Metals S.A., 56th km Athens – Lamia National Road, 32011 Oinofyta Viotias, Greece Abstract Fracture analysis and metallographic characterization is performed in selected machinable brass components, for use in hydraulic installations. Evidence of brittle fracture was mainly indicated by the presence of intergranular failure and limited plasticity areas. Multiple cracking was observed at the most highly stressed areas, such as the crests of the threads, the cross section transitions and thinnest wall locations. Fractographic analysis performed using Field Emission SEM, suggested the occurrence of embrittling phenomena, probably attributed to overheating and subsequent Pb-phase grain boundary segregation. Metallographic cross section investigation rather supported the failure hypothesis, implying that hot shortness is the plausible cause of ductility trough and brittle failure. © 2017 The Authors. Publish d by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Hot shortness; brass failures; failure alysis; fr ctography 1. Introduction Leaded brass rods are widely used in a great variety of applications varying from decoration and architecture to electrical and mechanical engineering applications. Such special components, e.g. screws, nuts, bolts, fittings, connectors are produced ma nly by automatic machining processes, starting from extruded and drawn brass rods. Hydraulic components, such as faucets and complex systems - connecting pipes (distributors, valves, adaptors) are fabricated via casting or stamping followed by machining and surface treatment. Brass rods are used as raw materials 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Fracture analysis and embrittlement phenomena of machined brass components George Pantazopoulos*, Athanasios Vazdirvanidis ELKEME Hellenic Research Centre for Metals S.A., 56th km Athens – Lamia National Road, 32011 Oinofyta Viotias, Greece Abstract Fracture analysis and m tallographic characterization is performed in selected ma hinable brass components, for use in hydraulic installations. Evidence of brittl fracture was mainly indicated by the presenc of intergranular failure and limited pl st city areas. Multiple cracking wa observed at the most highly stressed areas, such as the crests of the threa s, the ross se ti n transitio s and thinnest wall locations. Fractographic nalysis performed using Field Em ssion SEM, u gested the occurrence of embrittling phenomena, probably attribu o overheating and ubsequent Pb-phase grain boundary segregation. M tallographic cr ss section investigation rather supported the failure hypothesis, implying that hot shortness is the plausible cause of ductility trough and brittle failure. © 2017 The Authors. Published by Elsevier B.V. Peer-revi w under responsibility of th Scientific Committee of ICSI 2017. Keywords: Hot s ortness; brass failures; failure an lysi ; fr ctography 1. Introduction Leaded brass rods are widely used in a great variety of applications varying from decoration and architecture to electrical and mechanical engineering applications. Such special components, e.g. screws, nuts, bolts, fittings, connectors are produced mainly by automatic machining processes, starting from extruded and drawn brass rods. Hydraulic components, such as faucets and co pl x systems - c nnecting pipes (distributors, valves, adaptors) are fabricated via casting or stamping followed by machining and surface treatment. Brass rods are used as raw materials © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 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.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.146 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Correspon ing author. Tel.: +30-226-260-4463; fax: +30-226-260-4358. E-mail address: gpantaz@elkeme.vionet.gr * Corresponding author. Tel.: +30-226-260-4463; fax: +30-226-260-4358. E-mail address: gpantaz@elkeme.vionet.gr