PSI - Issue 7

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Scie ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 7 (2017) 36–43 Structural Integrity Procedia 00 (2017) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 ScienceDirect

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 Aut ors. 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 On the role of internal defects in the fatigue damage process of a cast Al-Si-Cu alloy A. Brueckner-Foit* a , M. Luetje a , I. Bacaicoa a , A. Geisert b , M. Fehlbier b a Institut for M terials Engineering, University of Kassel, Moenchebergstras e 3, D-34109 Kassel, Germany b Chair of Foundry Technology, University of Kassel, Kurt-Wolters-Strasse 3, D-34109 Kassel, Germany Abstract The effect of different types of defects on the fatigue properties of a secondary Al-Si-Cu-Fe alloy was analyzed by micro-computed tomography and scanning electron microscopy. It was found that extended pores typically occurring at unfavourable cooling conditions possess several regions of similar stress concentration and hence multiple crack initiation is very likely. On the other hand, the Fe-rich incl sions may form impressive clusters and can contribute significantly to deteriorating the tensile properties of the material. However, they do not directly influence the fatigue properties in as cast specimens, as they are virtually absent in the casting skin. However, they may be relevant in pore formation as CT scans show that large pores can be enclosed in the cavities of the iron inclusion clusters. © 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. Keywords: Al-Si alloys; X-ray tomography; Fatigue damage; Pores; Fe-rich inclusions 1. Introduction Understanding the fatigue damage behaviour of cast components is essential to ensure the reliability of cast structural components and therefore, important efforts are being undertaken in order to accurately characterize the 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy On the role of internal defects in the fatigue damage process of a cast Al-Si-Cu alloy A. Brueckner-Foit* a , M. Luetje a , I. Bacaicoa a , A. Geisert b , M. Fehlbier b a Institute for Materials Engineering, University of Kassel, Moenchebergstrasse 3, D-34109 Kassel, Germany b Chair of Foundry Technology, University of Kassel, Kurt-Wolters-Strasse 3, D-34109 Kassel, Germany Abstract The effect of different types of defects on the fatigue properties of a secondary Al-Si-Cu-Fe alloy was analyzed by micro-computed tomography and scanning electron microscopy. It was found that extended pores typically occurring at unfavourable cooling conditions possess several regions of similar stress concentration and hence multiple crack initiation is very likely. On the other hand, the Fe-rich inclusions may form impressive clusters and can contribute signific ntly to deteriorating the tensile properties of the material. However, they do not directly influence the fatigue properties in as cast specimens, as they are virtually absent in the casting skin. However, they may be relevant in pore formation as CT scans show that large pores can be enclosed in the cavities of the iron inclusion clusters. © 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 D fects. Keywords: Al-Si alloys; X-ray tomography; Fatigue damage; Pores; Fe-rich inclusions 1. Introduction Understanding the fatigue damage behaviour of cast components is essential to ensure the reliability of cast structural components and therefore, important efforts are being undertaken in order to accurately characterize the © 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.

* Corresponding author. Tel.: +49 561 804 3680; fax: +49 561 804 3650 E-mail address: a.brueckner-foit@uni-kassel.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.: +49 561 804 3680; fax: +49 561 804 3650 E-mail address: a.brueckner-foit@uni-kassel.de

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

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 the 3rd International Symposium on Fatigue Design and Material Defects. 10.1016/j.prostr.2017.11.058