PSI - Issue 5

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 Structu al Integrity 5 (2017) 832–839 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 Analytical models of the S-N curve based on the hardness of the material Przemyslaw Strzelecki a, * , Tomasz Tomaszewski a a Institute of Mechanical Engineering, University of Science and Technology, 85-789 Bydgoszcz, Poland, PL To calculate fatigue life in hig -cycle region, the S-N characteristics for the material or construction element (depending on the calculation model employed) must be obtained. Due to this, analytical models are used for estimating the S-N fatigue curve. Since these methods bear significant error, hybrid models based on experimental data from hardness measurements were developed. Such evaluation is easy to perform, quick, and, most importantly, is a non-destructive examination. The paper presents two models for evaluating high-cycle fatigue characteristics, one of which is an own model. Both of these approaches are based on hardness measurement, and employ the relationship between hardness and tensile strength & fatigue limit. The described models were verified on experimental data for several construction materials. Tests were performed on smooth sa ples, and - for two materials - on notched samples. Moreover, literature data were also used for expanding the verification performed. The characteristics obtained indicate that the estimation of fatigue life for construction steel may be deemed as satisfactory. For the aluminum alloys and stainless steel, on the other hand, the estimation error is significant. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: fatigue design; S-N curve; high-cycle fatigue; accelerated methods i a h d, ant © 2017 Th Au ors. Published by Elsevier B.V. Peer-review un s onsib o Keywords: fatigue design; S-N curve; high-cycle fatigue; accelerated methods © 2017 The Authors. Published by Elsevier B.V. Peer-revi w und r responsibility of the Scientific Committee of ICSI 2017 Abstract

© 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. Fatigue life must be verified at all times when designing elements of machines subjected to loads variable in time. To make such calculations possible, the S-N characteristics for the material or construction element (depending on the ti

* Corresponding author. Tel.: +48-52-340-82-79; fax: +48-52-340-82-79. E-mail address: p.strzelecki@utp.edu.pl

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.2017.07.065 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.