PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Available o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 825–831 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal The methodology of transformation of the nominal loading process into a root of notch Chmelko Vladimír a , * Margetin Matúš a a Slovak University of Technology, Faculty of Mechanical Engineering, Institute of applied mechanics and mechatronics, Námestie slobody 17, 812 31 Bratislava, Slovak republic Abstract To evaluate the fatigue strength and fatigue lifetime of the component is necessary to know stress-strain state in the root of the notch in the form time depending process of the stress or strain. One of the option how to solve this problem is measuring of time varying nominal stress (strain) and then transforming this value into root of notch. If we want to use such transformation methodology it is necessary to carry out the following tasks  chose the suitable transformation method for elastic-plastic area of loading  define stress-strain characteristic which takes into account the loading history of the loading process with stochastic amplitudes  def ne th lg rith enabling continual computation of nominal str ss transfo mation into root notch The proposed methodology is ecessary to prove by direct mea urements in the notch (which allows that) and also confront with the fatigue lifetime under random loading of the component obtained by analytical and experimental examination. © 2017 The Author . Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: notch; fatigue; transformaion; random loding; 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal The methodology of transformation of the nominal loading process into a root of notch Chmelko Vladimír a , * Margetin Matúš a a Slovak University of Technology, Faculty of Mechanical Engineering, Institute of applied mechanics and mechatronics, Námestie slobody 17, 812 31 Bratislava, Slovak republic Abstract T evaluat the fatigue str gth and fatigue lifetime of the component is necessary to kn w s ress-strain state in the root of the notch in the form time depending process of the st ess or strain. One of the pti n h w to solv this problem i measuring of time varying n minal stres (strain) and then transforming this value into root of notch. If we want to use such transformation methodology it is necessary to carry out the following tasks chose the suitable transformation method for elastic-plastic area of loading  define stress-strain characteristic which takes into account the loading history of the loading process with stochastic amplitud s  defin the alg rithm enabling continual computatio of nominal s ress transf rmation into root no ch Th proposed methodology is necess ry to prove by direct measurements in the notch (which allows th t) and also confront wit the fatigu lifetime under random load ng of the component obtained by analytic l and ex erimental ex mination. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific C mmittee of ICSI 2017. Keywords: notch; fatigue; transformaion; random loding; © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017

1. Introduction

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. When a structural component contains a notch then the failure may start from the notch root due to growing of the crack. The places with notched effects ca be ref rred as "critical place of the structure" because their fatigue life When a structural component contains a notch then the failure may start from the notch root due to growing of the crack. The places with notched effects can be referred as "critical place of the structure" because their fatigue life

* Corresponding author. Tel.: +421 57296225. E-mail address: vladimir.chmelko@stuba.sk * Correspon ing author. Tel.: +421 57296225. E-mail address: vladimir.chmelko@stuba.sk

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.060 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.