PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 8 22–27 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity Procedia 00 (2018) 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental Effects on Structural Integrity Effect of condensate corrosion on tensile and fatigue properties of brazed AISI 304L stainless steel joints using gold-base filler metal Anke Schmiedt a, * Lars Lingnau a , Matthias Manka b , Wolfgang Tillmann b , Frank Walther a a TU Dortmund University, Department of Materials Test Engineering (WPT), Baroper Str. 303, D-44227 Dortmund, Germany b TU Dortmund University, Institute of Materials Engineering (LWT), Leonhard-Euler-Str. 2, D-44227 Dortmund, Germany Abstract As brazed joints have to resist static and cyclic loads in corrosive environments, the effect of a condensate corrosion acc. to VDA 230-214 on the mechanical properties of brazed AISI 304L/BAu-4 joints is investigated. A significant and time-dependent degradation of tensile and fatigue properties is determined over 6 weeks. For an evaluation of local deformations within the small area of the brazing seam, the digital image correlation technique in combination with a triggered image acquisition is used during tensile and fatigue tests. Here, an increasing influence of the gauge length on strain values is identified for increasing stress levels, enhanced by notch-containing surfaces of the pre-corroded brazed joints. Fatigue and corrosion fatigue damage processes are eval ated using scanning electron mic oscopy. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th ECF22 organizers. Keywords: brazed joints; AISI 304/BAu-4; condensate corrosion; corrosion fatigue; VDA 230-214; digital image correlation 1. Introduction Brazing technologies are one of the most reliable and economic methods to join materials and structures and are well established for numerous applications, in particular for the automotive industry, chemical engineering, power generation and aerospace applications. As brazed joints are usually exposed to static and cyclic loads within corrosive environments during operation processes, the effect of corrosion on the tensile and fatigue properties has to be taken into account for the component design. Several studies on the mechanical behaviour and corrosion resistance of brazed stainless steel joints have already been published, e.g. by Holländer et al. (2015). The fatigue properties of brazed ECF22 - Loading and Environmental Effects on Structural Integrity Effect of condensate corrosion on tensile and fatigue properties of brazed AISI 304L stainless steel joints using gold-base filler metal Anke Schmiedt a, * Lars Lingnau a , Matthias Manka b , Wolfgang Tillmann b , Frank Walther a a TU Dortmund University, Department of Materials Test Engineering (WPT), Baroper Str. 303, D-44227 Dortmund, Germany b TU Dortmund University, Institut of Materials Engineering (LWT), Leonhard-Euler-Str. 2, D-4 2 7 Dortmund, Germany Abstract As brazed joints have to resist static and cyclic loads in corrosive environments, the effect of a condensate corrosion acc. to VDA 230-214 on the mechanical properties of braze AISI 304L/BAu-4 j ints is investigated. A significant and time-dependent degradation of tensil and f tigue rti is determined over 6 weeks. F r an evaluation of local deformatio s within the small area of the brazing s am, the digital image correlation technique in combinatio with triggered image acquisition is used during tensile and fatigue tests. Here, an increasing influence of t e gauge length on strain values is id ntified for increasi g stress levels, enhanced by notch-containing surfaces of the pre-corroded brazed joints. Fatigue and corrosion fatigue damage processes are valuat using s anni g electron mi roscopy. © 2018 The Authors. Published by Elsevier B.V. Peer-review under esponsibility of the ECF22 organizers. Keywords: brazed joints; AISI 304/BAu-4; condensate corrosion; corrosion fatigue; VDA 230-214; digital image correlation 1. Introduction Brazing technologies are one of the most reliable and economic methods to join materials and structures and are well established for numerous applications, in particular for the automotive industry, chemical engineering, power generation and aerospace applications. As brazed joints are usually exposed to static and cyclic loads within corrosive environments during operation processes, the effect of corrosion on the tensile and fatigue properties has to be taken into account for the component design. Several studies on the mechanical behaviour and corrosion resistance of brazed stainless steel joints have already been published, e.g. by Holländer et al. (2015). The fatigue properties of raze © 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.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 organizers. * Corresponding author. Tel.: +49 231 755 8041; fax: +49 231 755 8029. E-mail address: anke.schmiedt@tu-dortmund.de * Corresponding author. Tel.: +49 231 755 8041; fax: +49 231 755 8029. E-mail ad ress: anke.schmiedt@tu-dortmund.de

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.004