PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1527–1532 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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. ECF22 - Loading and Environmental effects on Structural Integrity Microstructure, mechanical and fatigue properties of SiMo- and SiCu- nodular cast irons Alan Vaško a *, Milan Uhríčik a , Lenka Kuchariková a , Eva Tillová a a University of Žilina, Faculty of Mechanical Engineering, Department of Materials Engineering, Univerzitná 8215/1, 010 26 Žilina, Slovakia Abstract Fatigue has been a predominant fracture mode of load-bearing machine members. Therefore, through the years its prevention has become a fundamental design criterion. The objective of this study was to compare the microstructure, mechanical and fatigue properties of two types of the nodular cast irons – ferrite-pearlitic nodular cast iron alloyed by Si and Mo and pearlite-ferritic nodular cast iron alloyed by Si and Cu. Microstructure of the specimens was evaluated according to STN EN ISO 945 and by automatic image analysis. The image analysis system NIS Elements, interfaced with the light microscope, was used for evaluation of the shape factor, count of graphitic nodules and content of ferrite. Fatigue tests were realised at sinusoidal cyclic push-pull loading (stress ratio R = –1) at ambient temperature (T = 20  5 °C). They were carried out in the high cycle fatigue region (from 10 5 to 10 7 cycles) at frequency f  75 Hz using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100. The relationship between the amplitude of stress σ a a d number of cycles to failure N f , as well as the fatigue strength, were determined. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: SiMo-nodular cast iron; SiCu-nodular cast iron; microstructure; fatigue 1. Introduction The nodular cast ir , also known as du tile cas iron or spheroidal cast iron, is a type of graphitic cast iron, which contains graphite in the form of nodules. The spheroidal shape of graphite does not cause such a high concentration of stress as a lamellar graphite. Therefore, the nodular cast iron has higher tensile strength and © 2018 The Authors. Published by Elsevier B.V. Peer-review und responsibility of the ECF22 organiz rs. ECF22 - Loading and Environmental effects on Structural Integrity Microstructure, mechanical and fatigue properties of SiMo- and SiCu- nodular cast irons Alan Vaško a *, Milan Uhríčik a , Lenka Kuchariková a , Eva Tillová a a University of Žilina, Faculty of Mechanical Engineering, Department of Materials Engineering, Univerzitná 8215/1, 010 26 Žilina, Slovakia Abstract Fatigue has been a predominant fracture mode of load-bearing machine members. Therefore, through the years its prevention has becom a fundamental design criterion. The objective of this study was to compare the microstructure, mechanical and fatigue properties of two types of the nodular cast ir ns – ferrite-pearlitic nodular ast iron alloyed by Si and Mo and pearlite-ferritic nodular cast iron alloyed by Si and Cu. Mic structure of the specimens was evaluated acc rding t STN EN ISO 45 and by automati image analysis. The image analysis system NIS El ments, interfaced with the light microscope, was used for evaluation of th shape factor, count of gr phitic nodules and content of ferrite. Fatigue tests were realised at sinusoidal cyclic push-pull l ading (stress ratio R = –1) at ambient temp rature (T = 20  5 °C). They wer carri d out in the high cycle fatigue region (from 10 5 to 10 7 cycles) at frequency f  75 Hz using the fatigue experim ntal ma hin Zwick/Ro ll Amsler 150HFP 5100. The relationship betwe n the amplitude of stress σ a and number of cycles to failure N f , as well as the fatigue strength, were determin d. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: SiMo-nodular cast iron; SiCu-nodular cast iron; microstructure; fatigue 1. Introduction The nodular cast iron, also known as ductile cast iron or spheroidal cast iron, is a type of graphitic cast iron, which contains graphite in the form of nodules. The spheroidal shape of graphite does not cause such a high concentration of stress as a lamellar graphite. Therefore, the nodular cast iron has higher tensile strength and © 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.: +421-41-513 2605. E-mail address: alan.vasko@fstroj.uniza.sk * Corresponding author. Tel.: +421-41-513 2605. E-mail ad ress: alan.vasko@fstroj.uniza.sk

* 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 o ganizers.

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.2018.12.312