PSI - Issue 13

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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 Structural Integrity 13 8 79–84 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 ScienceDirect Structural Integrity Procedia 00 (2018) 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. ECF22 - Loading and Environmental effects on Structural Integrity Determination of Residual Fatigue Life of Welded Structures at Bucket-Wheel Excavators through the Use of Fracture Mechanics M. Arsić a , S. Bošnjak b , N. Gnjatović b , S.A. Sedmak c , D. Arsić d , Z. Savić a Institute for materials testing, 11000 Belgrade, Serbia, University of Belgrade, Faculty of Mechanical Engineering, 11120 Belgrade, Serbia, Innovation Centre of the Faculty of Mechanical Enginering, 11120, Belgrade, Serbia, Faculty of Engineering Sciences,University of Kragujevac, 34000 Kragujevac, Serbia Abstract This paper presents a methodological approach for the assessment of service life of vital welded structures of a bucket-wheel excavator Sch Rs 650/5x24 ('Thyssen Krupp', Germany) boom, subjected to cyclic loading with a variable amplitude through the use of experimental tests carried out in order to determine operational strength and growth of a fatigue crack. Realized researches and results presented in this paper offer great possibilities for the analyses of behaviour of vital welded structures of the bucket wheel boom. By th application of the measurement device with 8 channels for registration and processi g of electric si nals HBM Spider 8 and m asurem nt tapes HBM 6/350xXY31 deformations were measured at vital welded structures of the boom in the area of the bucket-whe l, made of teels St 37.2 and St 52.3 in accordanc with stan ard DIN 17100, or st els S235J2G3 and S355J2G3 in accordance with standard EN 10025-2. The objectiv of the test is to determine if there is a p ss bility of occurrence of plastic def rm tions or initial cracks due to fatigue at vital welded structures. Tests that refer to he growth of th fatigue crack located at the welded joint have been carried out by ending t three points with asymmetric load R = 0.5 (R = σ min / σ max ) at the specimen with a single edge notch. Tests were performed through the use of co trolled force, ranging between F max and F min at the high frequency pulsator ’Cracktronic’, while obtainment of data regarding the crack growth was carried out through the use of measurement gauge ARM A-10. ECF22 - Loading and Environmental effects on Structural Integrity Determination of Residual Fatigue Life of Welded Structures at Bucket-Wheel Excavators throu h the Use of Fracture Mechanics M. Arsić a , S. Bošnjak b , N. Gnjatović b , S.A. Sedmak c , D. Arsić d , Z. Savić a Institute for materials testing, 11000 Belgrade, Serbia, University of Belgrade, Faculty of Mechanical Engineering, 11120 Belgrade, Serbia, Innovation Centre of th Facul y of Mecha ical Engin ring, 11120, Belgrade, Serbia, Faculty of Engineering Sciences,University of Kra uj vac, 34000 Kragujevac, Serbia Abstract This paper presents a methodological approach for the assessment of service life of vital welded structures of a bucket-wheel excavator Sch Rs 650/5x24 ('Thyssen Krupp', Germany) boom, subjected to cyclic loading with a variable amplitude through the use of experimental tests carried out in order to determine operational strength and growth of a fatigue crack. Realized researches and results presented in this paper offer great possibilities f r the analyses of behaviour of vital welded structures of the bucket wheel boom. By the application of the measurement device with 8 channels for registration and processing of electric signals HBM Spider 8 and measurement tapes HBM 6/350xXY31 deformations were measured at vital welded structures of the bo m in the area of the bucket-wheel, made of steels St 37.2 and St 52.3 in accordance with standard DIN 17100, or steels S235J2G3 and S355J2G3 in accordance with standard EN 10025-2. he objective of the test is to d termine if there is a p ss bility of occurrence of plastic deformations or initial cra ks due to fatigue at vital welded structures. Tests that refer to the growth of the fatigue crack located at the welded joint have been carried out by bending at three points with asym etric load R = 0.5 (R = σ min / σ max ) at the specimen with a single edge notch. Tests were performed through the use of controlled force, rangin between F max and F min at the high frequency pulsator ’Cracktronic’, while obtainment of data regarding the crack growth was carried out through the use of measurement gauge ARM A-10.

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: bucket-wheel excavator, stress condition, c ack, service life Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: bucket-wheel excavator, stress condition, crack, service life

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.014

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