PSI - Issue 5

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 Struc ural Integrity 5 (2017) 1011–1018 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 Weldability of old mild steels in maintenance of historical steel structures Lars Sieber a *, Andre Kilian a , Holger Flederer a , Gunther Göbel b , Marco Steinhauser b a Dresden University of Applied Sciences, Dept. Civil Engineering, Friedrich – List-Platz 1, 01069 Dresden, Germany b Dresden University of Applied Sciences, Dept. Joining Technology, Friedrich – List-Platz 1, 01069 Dresden, Germany Welding process causes notch effects and residual stresses. Accordingly, the risk of brittle fracture grows. In comparison with currently used steels, old mild steels have a lower toughness. The weldability of mild steel is limited and only feasible under specific conditions. If for structural reasons welding is preferred instead of the use of bolts, the metallurgical characteristics of the steels have to be considered. These include the concentrations of impurities in the zones of segregation and the tendency to embrittlement by nitrogen-induced ageing. In the corresponding paper, experimental and analytical studies of the weldability of old mild steels are presented. Extensive material analyses to determine the mechanical and the technological properties of the material will be an essential part of the investigations. Particularly, the increased impurities of phosphorus, sulfur, nitrogen and also oxygen in the segregation zones as well as the distinctive non-metallic inclusions complicate to produce load-bearing butt welds. Welding materials currently available are not designed for welding such materials. Nevertheless, in the context of a research project welding tests on old mild steels has been carried out using current welding electrodes. Supported by involved industrial partners, a stick electrode adapted to the characteristics of old steels will be developed. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committe o ICSI 2017. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Weldability of old mild st els in maintenance of historical steel structures Lars Sieber a *, Andre Kilian a , Holger Flederer a , Gunther Göbel b , Marco Steinhauser b a Dresden University of A plied Sciences, Dept. C v l Engineerin , Friedrich – List-Platz 1, 01069 Dresden, Germany b Dresden University of Applied Sciences, Dept. Joining Technology, Friedrich – List-Platz 1, 01069 Dresden, Germany Abstract Welding proce s causes notch ffects and residual stres es. Accor ingly, the risk of br tt e fracture grows. In comparison with urrently used steels, old mild steel have a lower toughness. The weldability mi d s e l is limited and only feas ble under specific conditions. If for structural reasons welding is p eferred instead of the us f bolts, the me allurgical characteris ics of the ste ls have o b co sidered. These include the concentrations of impurities in the zones of segregation and the tendency to embrittlement by nitrogen-induced ageing. In he corresponding paper, experi ental and alytical studies of the weldability of old m ld steels are pre nted. Extensiv material analyses o determin the mechanical and the technological properties of the material will be an ssential part of the investigation . Particularly, the increased impurities of phosphorus, sulfur, n trogen and also oxygen in the segregation zones as w ll as the distinctive non-metallic inclusions complicate to produ e load-be ring butt welds. Welding materials currently available are not designed for welding such materia s. Nev rtheless, in the co text of a research project welding tests on old mild steels has been ca ried out using current welding el ctrodes. Supported by involved industrial partners, a stick electrode adapted to the characteristics of old steels will be developed. © 2017 The Autho s. Publ shed by Els vier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: re abilitati n, weldability, old mild steels, segregation, manual metal arc welding Keywords: rehabilitation, weldability, old mild steels, segregation, manual metal arc welding Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. * Corresponding author. Tel.: +49 351-462-3815; E-mail address: lars.sieber@htw-dresden.de * Correspon ing author. Tel.: +49 351-462-3815; E-mail address: lars.sieber@htw-dresden.de

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.2017.07.158 * 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.