PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1304–13 9 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Hydrogen Induced Damage in Heavily Cold-Drawn Wires of Lean Duplex Stainless Steel Mihaela Iordachescu 1, *, Maricely de Abreu 1 , Andrés Valiente 1 a Materials Science Dpt., E.T.S.I. Caminos, Universidad Politécnica de Madrid, Prof. Aranguren St., 28040, Madrid, Spain The paper addresses the sensitivity to hydrogen embrittlement of heavily cold-drawn wires made of the new generation of lower alloyed duplex stainless steels, often referred to as lean duplex grades. It includes comparisons with similar data corresponding to cold-drawn eutectoid and duplex stainless steels. For this purpose, fracture tests under constant load were carried out with wires in the as-received condition and fatigue-precracked, in air and exposed to ammonium thiocyanate solution. Microstructure and fractographic observations were essential means for the cracking analysis. The effect of hydrogen-assisted embrittlement on the damage tolerance of lean duplex steels was assessed regarding two macro-mechanical damage models that provide the upper bounds of damage tolerance and accurately approximate the failure behavior of the eutectoid and duplex stainless steels wires. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Cold-drawn lean duplex stainless steel; Embrittlement mechanisms; Damage tolerance; 1. Introduction Today, high-strength stainless steel wires obtained by cold drawing are potential candidates for prestressing concrete due to their mechanical properties, excellent resistance against corrosion and high damage tolerance when compared to eutectoid prestressing steels, as indicated by Moser et al. (2012a), Valiente and Iordachescu (2012), and De Abreu et al. (2014). Generally, strain hardening induced by cold drawing reduces the resistance of austenitic stainless steel to pitting 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Hydrogen Induc d Dam ge in Heavily old- ra n ires of Lean uplex Stainless Steel Mihaela Iordachescu 1, *, Maricely de Abreu 1 , Andrés Valiente 1 a Materials Science Dpt., E.T.S.I. Caminos, Universidad Politécnica de Madrid, Prof. Aranguren St., 28040, Madrid, Spain Abstract The paper addresses the sensitivity to hydrogen embrittlement of heavily cold-drawn wires made of the new generation of lower alloyed duplex stainless steels, often referred to as lean duplex grades. It includes comparisons with similar data corresponding to cold-drawn eutectoid and duplex stainless steels. For this purpose, fracture tests under constant load were carried out with wires in the as-received condition and fatigue-precracked, in air and exposed to ammonium thiocyanate solution. Microstructure and fractog phic observations were essential means for the cracking analysis. The effect of hydrogen-assisted embrittlement on the damage tolerance of lean duplex steels was assessed regarding two macro-mechanical damage models that provide the upper bounds of damage tolera ce and accurately approximate the failure behavior of the eutectoid and uplex stainless steels wires. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th Scientific Committee of ICSI 2017. Keywords: C ld-drawn lean duplex stainless steel; Embrittlement mechanisms; Damage tolerance; 1. Introduction Today, high-strength stainless steel wires obtained by cold drawing are potential candidates for prestressing concrete due to their mechanical properties, excellent resistance against corrosion and high damage tolerance when compared to eutectoid prestressing steels, as indicated by Moser et al. (2012a), Valiente and Iordachescu (2012), and De Abreu et al. (2014). Generally, strain hardening induced by cold drawing reduces the resistance of austenitic stainless steel to pitting 2017 The Auth rs. Published by Elsevier B.V. er-review under responsibil ty 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. Abstract

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.2017.07.117 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The 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. * Corresponding author. Tel.: +34-913-365-375; fax: +34-913-366-680. E-mail address: mihaela.iordachescu@upm.es * Corresponding author. Tel.: +34-913-365-375; fax: +34-913-366-680. E-mail address: mihaela.iordachescu@upm.es