PSI - Issue 2_A

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 Struc ural Integrity 2 (2016) 3202–32 9 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy A new approach for the analytical hcf strength assessment of components from nickel-base alloys Milan Peschkes a *, Jochen Höhbusch a , Henning Haensel a , Jan Scholten a a Research group for construction machinery and materials handling, Ruhr-Universität Bochum, Germany Abstract Based on the requirement of common guidelines for the assessment of the fatigue strength of structural components, this paper presents an approach to create an assessment workflow for components made of nickel-base alloys, based on the basic workflow of an existing guideline. Material-related parameters of the guideline that are considered to require adjustment when used for nickel-base alloys are modified, covering recent publications and available material studies. Besides the analytical determination of the materials fatigue strength, the approach especially deals with the influence of mean stress and notch sensitivity. The new approach is verified using component-like specimens which are designed based on typical pump-co ponents. Staircase tests are performed to retrieve the specimen’s high cycle fatigue strength experimentally. A finit e element model of the specimen including the test environment provides realistic local stress values for the computational process. The evaluated attempts to calculate the main influences are compared to the test results. Further selection is made regarding the usability of the presented approach. © 2016 The Authors. Published by Elsevier B.V. Peer-revi w under responsibility of the Scientific Committee of ECF21. Keywords: HCF Fatigu ; Strength Assessment; Nickel-Base Alloys; 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy A new approach for the analytical hcf strength assessment of components from nickel-base alloys Milan Peschkes a *, Jochen Höhbusch a , Henning Haensel a , Jan Scholten a a Research group for construction machinery and materials handling, Ruhr-Universität Bochum, Germany Abstract Based on the requirement of common guidelines for the assessment of the fatigue strength of structural components, this paper pres nts an approach to create an assessment workflow for components made of nickel-base alloys, based n the basic workflow of an existing guideline. Material-related parameters o the guideli e that are considered to require adjustment when used for nickel-ba e alloys are modified, cov ring recent publications and available material studies. Besides the analytical determinati n of the m t rials fatigue strength, the approa h es ecially deals with the influence of mean str s and notch sensitivity. The new approach is verified sing component-like specimens which are design d bas d on typic l pump-comp nent . Sta rcase tests are perf rmed to retrieve the specim ’s high cycl fatigue st ngth experim ntally. A finit e element model of the specimen including the test nvironment provides realistic local stre s values for the computational process. The evaluated attempts to calculate the main influe ces are compared to he test results. Further selection is m de regarding the usability of the presented appro ch. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: HCF Fatigue; Strength Assessment; Nickel-Base Alloys; Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction The fatigue behaviour of engineering components made of various steel or aluminium materials has been inv stigated for se eral decades and can t day b a sesse in gre t detail. Thus it is poss ble to d s gn and ass ss even critical components b s d o numeric l str ngth assessment. However there are till particular cases wh re Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. The fatigue behaviour of engineering components made of various steel or aluminium materials has been investigated for several decades and can today be assessed in great detail. Thus it is possible to design and assess even critical components based on numerical strength assessment. However there are still particular cases where 1. Introduction

* 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 ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +49-234-3227671; fax: +49-234-3214232. E-mail address: milan.peschkes@bmft.rub.de * Corresponding author. Tel.: +49-234-3227671; fax: +49-234-3214232. E-mail ad ress: milan.p schkes@bmft.rub.de

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.399