PSI - Issue 14

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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 Structu al Integrity 14 (2019) 642–648 ScienceDirect StructuralIntegrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2018) 000 – 000

www.elsevier.com/locate/procedia

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 Elsevi r B.V. This is an open access articl u de the CC BY-NC-ND licens (https://crea ivecommons.org/licens /by-nc- d/4.0/) Selection and peer-revi w unde responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Microstructural influence on damping for Friction stir welded Aluminum plates K.Vijayan a *, S.Jothi b , A.Pal a a Dept. of Ocean Engineering and Naval Architecture, IIT Kharagpur, Kharagpur - 721302, India b College of Engineering, Swansea University, Bay Campus, Swansea, SA1 8EN, UK Abstract Friction Stir Welding (FSW) is a sol d state welding process. in which a rotating tool m ves along the butted surfaces of rigidly clamped plates to form the weld. The speed of rotation, the axial load, feed rate and the type of tool influences the structural properties of the weld. An experimental study was carried out on Marine grade aluminum plates by varying the carriage speed, rotor speed and tools. A parametric study was carried out using three sets of carriage speed, rotor speed and tools. Further the FSW welded plates were analyzed for strength using universal testin machine. From the test results best, intermediate and worst cases were separated out based on the tensile strength and strain. One of the contributing factors towards this variability could be the sensitivity of friction coefficient. This results in improper heating and material distribution across advancing and retreating side. The microstructure of the welds was analyzed using. Next the influence of these microstructural grain properties on macroscopic damping behavior was analyzed by carrying out a modal testing on the welded structure. Understanding the damping behavi r is helpful in characterizing the vibration of the structure. S nsitivity analyses on the variati ns in the damping for different natural frequencies were carried out. The study clearly indicated a sensitivity of damping on the microstructural properties the FSW welded plates. © 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 influence on da ing for Friction stir welded Aluminum plates K.Vijayan a *, S.Jothi b , A.Pal a a Dept. of Ocean Engineering and Naval Architecture, IIT Kharagpur, Kharagpur - 721302, India b College of Engineering, Swansea University, Bay Campus, Swansea, SA1 8EN, UK Abs ract F iction Stir Welding (FSW) is a solid sta e welding process. in which a rotating tool moves long the butted surfaces of rigidly clamped plates to form the weld. The speed of rotation, he axial load, feed rate nd th type of tool influences the structural properti s of the weld. An experimental study was carr ed out on M rine grade alu inum plates by vary g the carriage speed, rotor sp ed and tools. A p rametric study was carried out us g thr e sets of ca riage speed, ro r speed and tools. Further th FSW welded plates were analyzed for strength u ing universal testing machine. From the tes results best, intermediate and worst cas s were separa ed o t based on the tensile strength and strain. One of the co tributing factors t wards this v riability could be the sensitivity of fr ction coefficient. This results in improper he ting and material distribution across advanci g and retreating side. The mic ostructure of th welds was analyzed using. N xt the influ ce of these microstructural grain properties on macroscopic damping behavior as analyzed by carrying out modal testing o the w lde structure. Understanding the damping behavior is helpful in characterizing the vibration of the structure. Sensitivity analyses on the variations in the damping for different natural frequencies were carried out. The study clearly indicated a sensitivity of damping on the microstructural properties the FSW welded plates. © 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/) S lection and peer- eview under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords :Friction stir welding; Damping; HAZ; TMAZ.

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

* Corresponding author. Tel.: +91-3222-281782; fax: +91-3222-255303. E-mail address: kiran.vijayan@naval.iitkgp.ac.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.2019.05.079 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. * Corresponding author. Tel.: +91-3222-281782; fax: +91-3222-255303. E mail address: kiran.vijayan@naval.iitkgp.ac.in * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt

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