PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 5 (2017) 93–98 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 D minatio of s lf-heating effect during fatigue of p lymeric composites Andrzej Katunin a, * a Institute of Fundamentals of Machinery Design, Silesian University of Technology, Konarskiego 18A, Gliwice 44-100, Poland The following study focuses on investigation of influence of a self-heating temperature value on a fatigue process of polymeric composites and, in particular, on a criticality of this effect. A main goal of the study is to find a temperature value at which its growth becomes non-stationary (and thus dominates the fatigue processes) and investigate an influence of selected self-heating temperature values on fatigue life of a composite structure. The investigation is based on experimental studies, during which specimens were subjected to cyclic loading with simultaneous measurement of loading force, deflection velocity, surface temperature and acoustic emission. Such measurements allow for accurate evaluation of differences between particular loading cases as well as determination of characteristic points (moments) of degradation initiation, and finally analysis of all of the measured parameters within a number of cycles to failure. Based on the obtained results it was found that the self-heating effect is possibly dangerous to cyclically loaded composite structures even at relatively low self-heating temperature values and may significantly shorten their structural lifetime. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: fatigue of polymeric composites; self-heating effect; accelerated degradation al a, 8A rs. Published by Elsevier B.V. Keywords: © 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. A self-heating effect, occurring in polymeric composites during vibrations or cyclic loading due to a viscoelastic nature of polymers used for such composites, is a very dangerous pheno enon, which, under certain conditions, may

* Corresponding author. Tel.: +48-32-237-2741; fax:+48-32-237-1360. E-mail address: andrzej.katunin@polsl.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.2017.07.073 * 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.