PSI - Issue 14

ScienceDirect

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 Structural Integrity 14 (2019) 482–49 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Structural Integrity Procedia 00 (2018) 000–000

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www.elsevier.com/locate/procedia 2nd International Confer nce n Structural Integrity and Exhibition 2018 Fatigue Crack Growth Studies on Power Plant Piping Materials under Corrosive Environment 2nd International Conference on Structural Integrity and Exhibition 2018 Fatigue Crack Growth Studies on Power Plant Piping Materials under Corrosive Environment 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. © 2019 Th Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. S. Vishnuvardhan a, *, M. Saravanan b , P. Gandhi c , G. Raghava d a Senior Scientist, CSIR - Structural Engineering Research Centre, Chennai - 600 113, India b Senior Scientist, CSIR - Structural Engineering Research Centre, Chennai - 600 113, India c Chief Scientist, CSIR - Structural En ineering Research Centre, Chennai - 600 113, India d Formely Chief Scientist, CSIR - Structural Engineering Research Centre, Chennai - 600 113, India Abstract Fatigue crack growth (FCG) experiments were carried out on Eccentrically-loaded Single Edge notch Tension [ESE(T)] specimens made of SA 333 Gr. 6 and SA 516 Gr. 70 steels under demineralized water and 3.5% NaCl aqueous environments. The corrosion pro ess was accelerated by increasing the corrosion current, using an external current source and the experiments were conducted at two different levels of corrosion current by applying constant Direct Current (DC) of 0.1, 0.2 A and 0.3 A. The experiments were carried out under constant amplitude cyclic sinusoidal loading; the stress ratio was maintained as 0.1 and the test frequency was either 0.25 Hz or 0.50 Hz. Crack growth in the length direction was continuously observed and the images were recorded at regular intervals of fatigue cycles. Crack growth rate ( da / dN ) and stress intensity factor range (  K ) values were evaluated at incremental values of loading cycles and crack length. Under demineralised water environment, crack growth rate was observed to be more in SA 516 Gr. 70 steel when ompared with that in SA 333 Gr. 6 steel. In the case of SA 333 Gr. 6 steel, crack initiation lif increased by 50% and fatigue life increased by 19% when the applied external current value decreased from 0.3 A to 0.2 A, under 3.5 % NaCl aqueous environment. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. S. Vishnuvardhan a, *, M. Saravanan b , P. Gandhi c , G. Raghava d a Senior Scientist, CSIR - Structural Engineering Research Centre, Chennai - 600 113, India b Senior Scientist, CSIR - Structural Engineering Research Centre, Chennai - 600 113, India c Chief Scientist, CSIR - Structural Engineering Research Centre, Chennai - 600 113, India d Formely Chief Scientist, CSIR - Structural Engineering Research Centre, Chennai - 600 113, India Abstract Fatigue crack growth (FCG) experiments were carried out on Eccentrically-loaded Single Edge notch Tension [ESE(T)] specimens made of SA 333 Gr. 6 and SA 516 Gr. 70 steels under demineralized ater and 3.5% NaCl aqueous environments. The corrosion process was accelerated by increasing the corrosion current, using an external current source and the experiments were conducted at two different levels of corrosion current by applying constant Direct Current (DC) of 0.1, 0.2 A and 0.3 A. The experiments were carried out under constant amplitude cyclic sinusoidal loading; the stress ratio was maintained as 0.1 and the test frequency was either 0.25 Hz or 0.50 Hz. Crack growth in the length direction was continuously bserved and the images were r corded at regular intervals of fatigue cycles. Crack growth ra e ( da / dN ) and s ress intensity factor range (  K ) values wer evaluated at incr mental values f loading cycles and crack length. Un er demineralised water environment, crack growth rate was observed to be more in SA 516 Gr. 70 steel w n compared with th t in SA 333 Gr. 6 ste l. In the case of SA 333 Gr. 6 steel, crack initiati n life increased by 50% and fatigue life increased by 19% when the applied external urrent value decreased from 0.3 A to 0.2 A, under 3.5 % NaCl aqueous environm nt. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

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

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. * Corresponding author. Tel.: +91-44 22549790; fax: +91-44 22541508. E-mail address: svvardhan@serc.res.in

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.05.058 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. * Corresp ndi g author. Tel.: +91-44 22549790; fax: +91-44 22541508. E-mail d ress: svvardhan@s rc.r .in * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt