PSI - Issue 4

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 4 (2017) 27–34 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. ESIS TC24 Workshop "Integrity of Railway Structures", 24-25 October 2016, Leoben, Austria Crack growth under constant amplitude loading and overload effects in 1:3 scale specimens David Simunek a* , Martin Leitner a , Jürgen Maierhofer b , Hans-Peter Gänser b a Montanuniversität Leoben, Franz-Josef Straße 18, 8700 Leoben, Austria b Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700 Leoben, Austria Abstract Assessment of railway axles requires a detailed analysis of the crack driving mechanisms in the component. Therefore, experimental investigations are performed to determine input parameters for analytical and numerical calculations and analyze material behavior at specific load sequences. In this work, results of the current research project entitled “Eisenbahnfahrwerke 3 (EBFW 3) ” - ‘ Probabilistic fracture mechanics concept for the assessment of railway wheelsets ’ including an overview of the project philosophy are presented. One goal of the project is the transferability of material parameters, determined on standardized small-scale specimens to the real full-scale axle. Amongst others, influences like residual stresses due to manufacturing, scattering of material parameters, geometry and size effects are responsible for deviations of crack propagation and residual lifetim . In addition to th se investiga ions, tests of 1:3 scale specimens are performed as link between small-sc le laboratory and full-scale specimens. Based on the experimental work, crack propagation approaches are validat d and modifie to improve the accuracy of assessment methods. In this paper, focus of the experimental investigations is laid on crack growth under constant amplitude loading and overload effects. It is shown that, retardation of the crack growth rate can delay the number of load-cycles under constant amplitude loading by a factor of 1.6 up to 3.3. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ESIS TC24. Keywords: Railway axle; crack propagation, overload effects, residual lifetime; 1:3 scale specimen, full scale specimen ESIS TC24 Workshop "Integrity of Railway Structures", 24-25 October 2016, Leoben, Austria Crack growth under constant amplitude loading and overload effects in 1:3 scale specimens David Simunek a* , Martin Leitner a , Jürgen Maierhofer b , Hans-Peter Gänser b a Monta universität Leoben, Franz-Josef Straß 18, 8700 Leoben, Austria b Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700 Leoben, Austria Abstract Ass ssment of railw y axles requires a detailed analysis of the crack driving mechanisms in the component. Therefore, exp mental investig ions are perf rmed to determine input parameters for analytical and numerical c lculations and a alyze material behavio at specific load sequences. In this work, results of the current research project ntitled “Eisenbahnfahrw rk 3 (EBFW 3) ” - ‘ Probabilistic fractur mecha ics concep for th as essment of railway wheelsets ’ including an overvi w of he p oject philosophy ar pr sented. One goal of the project is the t ansferability of materi parameters, determined on standardized small-scale s eci ns to the r al full-scal axl . Among t thers, influences like residual stresses due to manufacturing, scatter ng o material paramet rs, geometry and size effects are responsible for evi ons f crack propagation nd residu l lifetime. I addition to the e investigations, t st of 1:3 s le specim ns are erf rmed s a link b tween small-scale labo atory and full-scale specimens. Based on the experim ntal work, crack ropaga i n approaches are v lida ed an m dified to improve the accuracy f assessment methods. In this paper, focus of he experimental investigations is l id on crack growth under constant amplitude loading and overload effects. It is shown that, retardation of the crack growth rate can delay the number of load-cycles under constant amplitude loading by a factor of 1.6 up to 3.3. © 2017 The Authors. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ESIS TC24. Keywords: Railway axle; crack propagation, overload effects, residual lifetime; 1:3 scale specimen, full scale specimen Copyright © 2017. The Authors. Published by Els vier B.V. Peer-review under responsibility of he Scientific Committee of ESIS TC24.

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. * Corresponding author. Tel.:+43-(0)3842-402-1452; fax:. +43-(0)3842-402-1402; E-mail address: david.simunek@unileoben.ac.at * Corresponding author. Tel.:+43-(0)3842-402-1452; fax:. +43-(0)3842-402-1402; E-mail address: david.simunek@unileoben.ac.at 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 Copyright  2017. The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ESIS TC24 10.1016/j.prostr.2017.07.015 * 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 ESIS TC24. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ESIS TC24.