PSI - Issue 7

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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 7 (2017) 423–43 Structural Integrity Procedia 00 (2017) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 ScienceDirect

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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. Copyright © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy Multiple crack initiation and propagation in weldments under fatigue loading M. Madia a, *, B. Schork b , J. Bernhard c , M. Kaffenberger b a Bundesanstalt für Materialforschung und -prüfung (BAM), Division 9.1, Unter den Eichen 87, D-12205 Berlin, Germany b Center for Engineering Materials – State Materials Testing Institute Darmstadt (MPA) Institute for Materials Technology (IfW), Technical University Darmstadt, Grafenstraße 2, D-64283 Darmstadt, Germany c Fraunhofer Institute for Structural Durability and System Reliability LBF, Bartningstraße 47, D-64289 Darmstadt, Germany Abstract The work aims at addressing the modelling and implementation of criteria for multiple crack propagation, including interaction and coalescence, for a more reliable fracture mechanics-based prediction of stress-life curves for weldments. A large experimental work is presented in which micro-cracks have been made visible by heat-tinting at successive stages of fatigue life of the welded specimens. Here the correlation between the number of initiation sites and the applied stress level has been also investigated. The criteria have b en implemented in in-house software, which allows multiple fatigue crack propag tion, and validated against select d experimental test . The esults have shown that the modelling of multiple c ack propagation and in eracti n s crucial for the predic of the atigue strength of weldments, both in f nite and infini e life regime. © 2017 The Author . Published by Elsevier B.V. Peer-review und r responsibility of the Scientific Committee of th 3rd International Symposium on F tigue Design and Material Defects. Keywords: Weldments; fatigue strength; multiple crack propagation; short cracks 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy Multipl crack initiation and pr pagation in weldments under fatigue loading M. Madia a, *, B. Schork b , J. Bernhard c , M. Kaffenberger b a Bundesanstalt für Materialforschung und -prüfung (BAM), Division 9.1, Unter den Eichen 87, D-12205 Berlin, Germany b Center for Engineering Materials – State Materials Testing Institute Darmstadt (MPA) I stitute for Materials Technology (IfW), Technical University Darmstadt, Grafenstraße 2, D-64283 Darmstadt, Germany c Fraunhofer Institute for Structural Durability and System Reliability LBF, Bartningstraße 47, D-64289 Darmstadt, Germany Abstract The work aims at addressing the modelling and implementation of criteria for multiple crack propagation, including interaction and coalescence, for a more reliable fracture mechanics-based prediction of stress-life curves for wel ments. A large experimental work is presented in which micro-cracks have been made visible by heat-tinting at successive stages of fatigue life of the welded specimens. Here the correlation between the number of initiation sites and the applied stress level has been also investigated. The criteria have been impleme ted in in-house software, which allows multiple fatigue crack propagation, and validated against selected experimental tests. The results have shown that the modelling f multiple crack propagation and interaction is crucial for the prediction of the fatigue stre g of weldments, both in finite and infinite life regime. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of he Scientific Committee of the 3rd I ternational Symposium on Fatigue Design an Material D fects.

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +49 (0) 30 8104 4166. E-mail address: mauro.madia@bam.de * Corresponding author. Tel.: +49 (0) 30 8104 4166. E-mail address: mauro.madia@bam.de

2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 10.1016/j.prostr.2017.11.108

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