PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 158–167 Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 ScienceDirect

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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 n open access article nder the CC BY-NC-ND license (http ://creat vecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-r view und r resp nsibility of Peer-revi w un er responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Synthesis and Optimization of Steering Mechanism of Extra-Long Semi-Trailer Vehicle Abhijit Kulkarni a *, Rushikesh Nanaware b , Akhilesh Kulkarni c , Vikrant Garud d* a,,b,c Pimpri Chinchwad Collage of Engineering, Pune, India d Independent Reseacher; Alumni, ARAI Academy, Pune, India Abstract The ongoing research work deals with the characterization and optimization of the steering system of an extra-long semi-trailer vehicle used for remote control station operations. Such a vehicle requires good manoeuvrability as the vehicle needs to be moved in unpr ed arrow terrains with sharp turns. It was observed that th teering errors for the existing system is high i.e. around 80 which leads to shearing off of the tie rod pins at higher articulation angles between tractor and trailer. Genetic algorithm is used to synthesize the mechanism and to optimize the steering errors within the limitations of the hydro-mechanical steering system. Optimization is carried out in MATLAB, for which the mechanism including the optimization function was modelled mathematically and codes were written accordingly. For the purpose of characterization of current design, kinematic analysis of using MSC-ADAMS was carried out. Post optimization, it was found that the magnitude of errors in the angles of the wheels are less than 50. The magnitude of error in the tie rod (Translational displacement) was brought down from 30.4 mm to less than 1.05 mm. This error can be adjusted in tolerances of the joints thereby eliminating the additional load acting on pin during sharp turns due to over constraint steering system. The optimised errors are within acceptable range and bending/shearing of tie rod pin has not been observed after extensive road trials with simulated loads. © 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 Synthesis and Optimization of Steering Mechanism of Extra-Long Semi-Trailer Vehicle Abhijit Kulkarni a *, Rushikesh Nanawar b , Akhilesh Kulk rni c , Vikrant Garud d* a,,b,c Pimpri Chinchwad Collage of Engineering, Pune, India d Independent Reseacher; Alumni, ARAI Academy, Pune, India Abstract The ongoing research work deals with the characterization and optimization of the steering system of an extra-long semi-trailer vehicle used for remote control station operations. Such a vehicle requires good manoeuvrability as the vehicle needs to be moved in unprepared narrow terrains with sharp turns. It was observed that the steering errors for the existing system is high i.e. around 80 which leads to shearing off of the tie rod pins at higher articulation angles between tractor and trailer. Genetic algorithm is used to synthesize the mechanism and to optimize the steering errors within the limitations of the hydro-mechanical steering system. Optimization is carried out in MATLAB, for which the mechanism including the optimization function was modelled mathematically and codes we e writte ac rdingly. Fo the purpose f cha acterization of current d sig , kinematic analysis of using MSC-ADAMS was carried out. Post optimization, it was found that the magnitu e of errors in the angles of th wh els are less than 50. The magnitude of error i the tie rod (Translational isplacement) was brought down from 30.4 mm to less than 1.05 mm. This error can be adjusted in tolerances of the joints thereby eliminating the additional load acting on pin during sharp turns due to over constraint steering system. The optimised errors are within acceptable range and bending/shearing of tie rod pin has not been observed after extensive road trials with simulated loads. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND lic nse (https://crea ivecommons 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: O ptimization; Semi-trailer; Genetic algorithm; MATLAB; MSC-ADAMS. Keywords: O ptimization; Semi-trailer; Genetic algorithm; MATLAB; MSC-ADAMS.

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

* Corresponding author. Tel.: +918208788926 E-mail address: amk1796@gmail.com & vicky_garud100@yahoo.co.in * Corresponding author. Tel.: +918208788926 E-mail address: amk1796@gmail.com & vicky_garud100@yahoo.co.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.2019.05.021 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.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt