PSI - Issue 7

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 Structu al Integrity 7 (2017) 431–437 Available online at www.sciencedirect.com ScienceDirect Structural I tegr ty 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. Copyright © 2017 The Authors. Published y Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. Examples of actual defects in high pressure pipelines and probabilistic assessment of residual life for different types f pipeline steels Ivo Černý a, *, Dagmar Mikulová a , Jiří Sís a a SVÚM a.s., Tovární 2053, 25088 Čelákovice, Czech Republic Abstract During recent internal inspection of an operated high pressure pipeline of the diameter DN700, distinct, quite large indications of cracks were found in one of the pipe sections. A part of the section was taken from the ground for a comprehensive experimental programme containing analyses of the defect type, dimensions and character and also fatigue test at variable internal pressure with the maximum value corresponding to real operation. The analysed defects mostly occurred during pipe manufacture followed by stress corrosion cracking mechanism in some cases. An existence of fatigue crack growth (FCG) during fatigue pressure test in s me cases was demonstr ted. Within another expe imental programme, n extensive measurem nt of FCG rates in different high pressure pipeline steels was performed. The evaluated data enabled to carry out serious statistical evaluation. Probabilis ic assessment of re idual life of pipes made o differ nt steels, containing semi elliptical external surface axial crack was car ied out using ALIAS HIDA software developed within the Eur pe n Framework Programme project. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. Keywords: High pressure pipelines ; defects ; fatigue crack growth ; probabilistic assessment 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy Ex mples of actual def cts in high press re pip lines and probabilistic assessment of residual life for different types of pipeline steels Ivo Černý a, *, Dagmar Mikulová a , Jiří Sís a a SVÚM a.s., Tovární 2053, 25088 Čelákovice, Czech Republic Abstract During rec nt i ter al inspection f an operated high pressure pipeline of the di meter DN700, distinct, qu te arge indications of cracks were found in one of the pi e sections. A part of the section w s taken from the ground for a comp ehens v experimental programme containing analyses of the d fect type, dimension and charac r and also fatigue test at variable internal pressur with th maximu value corr sponding to real operati . The analysed defects mostly occurr d during ipe manufacture follow d b stress cor o ion cracking mechanism in some cases. An exis ence of fa ig e c ack growth (FCG) during fatigu p essure test in ome cases was monstrated. W thin another xperim ntal programme, n xtensive m asurement of FCG rates in diffe ent hig pressure pipeline steels was performed. T e evaluated data nabled to carry out s ri us statistical ev u tion. Probabilistic ass ssment f residual life of pipes made of different steels, contai ing semi elliptical ext rnal surface axial crack was carried out using ALIAS HIDA software developed within the European Framework Programme project. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material D fects. 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High pressure pipelines ; defects ; fatigue crack growth ; probabilistic assessment

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +420-326509050; fax: +0-000-000-0000 . E- mail address: Ivo.Cerny@seznam.cz

* 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 the 3rd International Symposium on Fatigue Design and Material Defects. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. * Corresponding author. Tel.: +420-326509050; fax: +0-000-000-0000 . E mail address: Ivo.Cerny@seznam.cz

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 10.1016/j.prostr.2017.11.109