PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 322–329 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com 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. © 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. 2nd International Conference on Structural Integrity and Exhibition 2018 Microstructural Evolution of Brazed Ti-joint Using Ti 20 Zr 20 Cu 50 Ni 10 Metallic Glass Ri bon as Filler P. Rama Rao* a, c , Anil K. Bhatnagar a , Bhaskar Majumdar b and K. Muraleedharan c a School of Engineering Sciences & Technology University of Hyderabad, Hydera ad 500046, India b Defence Metallurgical Research Laboratory Kanchanbagh, Hyderabad – 500 058, India c CSIR-Central Glass and Ceramic Research Institute, Kolkata– 700032, India Abstract Metallic glasses of Ti 20 Zr 20 Cu 50 Ni 10 in the form of hard ribbon were produced by th standard melt-spinning technique on copper roller wheel in air. Vacuum brazing using these ribbons were done to join two plates of Ti alloy at 990 K for a period of 10 min. The main aim of the present work was to study the use of the metallic glass ribbons as brazing material for titanium based alloys. Since the microstructure during crystallization of these metallic glasses is expected to influence the strength of brazing joints, microstructure characterization is very important. Here we present the results of characterization of the ribbons with Ti 20 Zr 20 Cu 50 Ni 10 composition as well as the brazed sample after joining two Ti-plates. Both as-spun and heat-treated ribbon were characterized by X-ray Diffractometry (XRD), Field-Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM) and the energy dispersive X-ray spectroscopy (EDX) attached to both TEM and FESEM. The as-prepared ribbons showed amorphous nature when examined on both surfaces by XRD and as was also verified by TEM study of heat treated (753 K, 30 min.) ribbon showed formati n of nanocrystalline microstructure comprised of equi axed gr ins having sizes in the rang of about 50-200 nm. Electron diffraction analysis in the TEM suggested the presence of two phases, viz., cubic Ti 2 Ni and (Ti, Zr) 2 Ni phases. © 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. 2nd International Conference on Structural Integrity and Exhibition 2018 Microstructural Evolution of Brazed Ti-joint Using Ti 20 Zr 20 Cu 50 Ni 10 Metallic Glass Ribbon as Filler P. Rama Rao* a, c , Anil K. Bhatnagar a , Bhaskar Majumdar b and K. Muraleedharan c a School Engineering Sciences & Technology University of Hyderabad, Hyder bad 500046, India b Defence Met llurgical Research Laboratory Kanchanbagh, Hyderabad – 500 058, Indi c CSIR-Central Glass and Ceramic Research Institute, Kolkata– 700032, India Abstract Metallic glasses of Ti 20 Zr 20 Cu 50 Ni 10 in the form of ha d ribbon were produced by the standard melt-spinning technique n copper roll r wheel n air. Vacuum brazing using these ribbons were done to join two plates of Ti alloy at 990 K for a period of 10 min. The main aim of the p esent work was to study the use of the metallic glas ribbons as braz g mat rial for titanium ased all ys. Sin e the mic ostructur dur ng crystallizati n of these m tallic glass s i expected to influence the strength of brazing joints, microstructure characterization is very important. Here we presen the results of characterization of the ribbons with Ti 20 Z 20 Cu 50 Ni 10 compositio s well as he brazed sample after joining two Ti-plates. Both as-spun and heat-treated ribbon were characte ized by X-ray Diffractometry (XRD), Field-Emission Scanning lectron Microscopy (FESEM), Transmissi Electron Micro opy (TEM) and the e rgy disp rsive X-ray spec ro copy (EDX) attache to both TEM an FES . The as-prepa ed ribbons showed amorphous nature when examined on both surf c s by XRD and s was also verified by TEM study of heat treated (753 K, 30 min.) ribbo showed format on of nanocrystall e microstructu e comprised of equi axed grains having s zes i the range of a out 50-200 nm. Electron diffraction analysis in the TEM suggested the res nc of tw phases, viz., cubic Ti 2 Ni and (Ti, Zr) 2 Ni phases. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-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: Metallic glass; Brazing; Scanning and electron microscopy; Energy dispersive spectroscopy; Keywords: Metallic glass; Brazing; Scanning and electron microscopy; Energy dispersive spectroscopy;

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

* Corresponding author. Tel.: +91-983-122-6000; fax: +91-332-473-3469. E-mail address: panugothu.ramarao@gmail.com * Correspon ing author. Tel.: +91-983-122-6000; fax: +91-332-473-3469. E-mail address: panugothu.ramarao@gmail.com

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 a open access article und r the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

* 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 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.2019.05.040