PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3647–3653 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 il l li t . i ir t. i i tructural Integrity rocedia 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 Oxidation behavior during prolonged service of boiler tubes made of 2.25Cr1Mo and 12Cr1Mo0.3V heat resistance steels Gordana M. Bakic a *, Milos B. Djukic a , Br tislav Rajicic a , V ra Sijacki Zer vcic a , Aleksandar Maslarevic b , Ne ad Milosevic a a University of Belgrade – Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade 35, Serbia b University of Belgrade - Innovation Center of the Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade 35, Serbia Abstract During service of thermal power plant (TPP) units, different components are exposed to high temperature due to technological cycle of TPP unit. Service lifetimes of these components, especially boiler heating surfaces, may be limited due to creep, fatigue or oxidation, but materials designed for use at high temperatures have been developed primarily for their creep properties and micro uctural stability during long term exposures at elevated temperatures. Having in mind that oxidation in steam environment on the inner surface of boiler tubes and in flue gass on the outer surface of boler tubes could lead to a different consequences regarding service life of tubes, either directly through m tal wastage or in irectly thr ugh raising local temperatures due to the lower thermal conductivity of the oxi e scale, the oxidation behaviour of a different heat resistant steels become very important characteristics. In this paper are presented some data about the oxidation behavior of boiler tubes made of 2.25Cr1Mo and 12Cr1Mo0.3V steel after service of approximately 130.000 and 200.000h in two 620MW TPP units. Characterization of oxide scales on the inner side on tubes made of two steels with different chromium content, after two different prolonged periods of service, were compared and also their influence on the service life of tubes and kinetics of oxide scale growth were analyzed. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. t r f r r t r , , - , t i , It l of 2.25Cr1Mo and 12Cr1Mo0.3V hea ls rdana M. Bakic a *, Mil . j i a , ati l ji i a , e ij i a i a , l nd r l i b , Milos i a a niversity of elgrade – aculty of echanical ngineering, raljice arije 16, 11120 elgrade 35, Serbia b niversity of elgrade - Innovation enter of the aculty of echanical ngineering, raljice arije 16, 11120 elgrade 35, Serbia Abstract ri ser ice f t er al er la t ( ) its, iffere t c e ts are e se t i te erat re e t tec l ical c cle f it. er ice lifeti es f t ese c e ts, es eciall iler eati s rfaces, a e li ite e t cree , fati e r i ati , t aterials esi e f r se at i te erat res a e ee e el e ri aril f r t eir cree r erties a icr str ct ral sta ilit ri l ter e s res at ele ate te erat res. a i i i t at i ati i stea e ir e t t e i er s rface f iler t es a i fl e ass t e ter s rface f ler t es c l lea t a iffere t c se e ces re ar i ser ice life f t es, eit er irectl t r etal asta e r i directl t r raisi l cal te erat res e t t e l er t er al c cti it f t e i e scale, t e i ati e a i r f a iffere t eat resista t steels ec e er i rta t c aracteristics. I t is a er are rese te s e ata a t t e i ati e a ior of boiler tubes made of . r a r . steel after ser ice f a r i atel . a . i t its. Characterizati f ide scales on the i er si e t es a e f two steels with different chromium content, after two different prolonged periods of service, were compared and also their i flue ce t e service life of t bes and i etics of i e scale r t ere a al zed. 016 T e t rs. lis e ls ier . . er responsi ilit f t e cie tific ittee f . 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. eer-re ie

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: surface temperature ey ords: surface te perature

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

* 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 he uthors. ublished by lsevier . . eer-re ie er res si ilit f t e cie tific ittee f . * Corresponding author. Tel.: +381113370375; fax: +381113370364. E-mail address: gbakic@mas.bg.ac.rs * orresponding author. el.: 381113370375; fax: 381113370364. - ail address: gbakic as.bg.ac.rs

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.2016.06.453