PSI - Issue 14

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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 Elsevi r B.V. This is a open access articl u de the CC BY-NC-ND licens (https://crea iv commons.org/licens /by-nc- d/4.0/) Selection and p er-revi w unde responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Fracture behaviour of p-Aramid and ultra high molecular weight polyethylene based hybrid composite Arun Kumar Singh a, b, * , Dharmendra Kumar Shukla b and N Eswara Prasad a a Defence Materials & Stores R & D Establishment (DMSRDE), DRDO, Kanpur-208013 (India) b MechanicalEngg. Department, Motilal Nehru National Institute of Technology, Allahabad-211004 (India) Abstract Damage in the form of delamination and debonding are the most common failure modes observed in polymeric composites used for high end structural applications. The principal aim of this work is to investigate the fracture behaviour of Ultra High Molecular Weight Polyethylene (UHMWPE) and p-aramid based hybrid composite. In this work, an optimized processing condition based on highest flexural strength has been evaluated using Box-Behken design of experiment method to fabricate the hybrid composite. Based on most optimized processing conditions process variable such as 14.2 MPa for pressure, 120 o C for temperature and 12.7 minutes for time, compression moulded hybrid composites were prepared and the same were studied in detail for their interlaminar fracture toughness. In the present study, a finite notch radius that varied from 110 – 750 µm has been employed. The fracture toughness/resistance (K 1c ) of the material has been evaluated and analyzed by investigating the influence of varying notch root radii. The results obtained from the analysis showed that the critical notch root radius of the hybrid composit is around 340 µm. The load displacement data f three point bend test with varied crack length are used to evaluate plain strain fracture toughness (K 1c ). The K 1c has been found 1.5 MPa√m for the K Q values derived from specimens with a/W of 0.45-0.55. © 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. Keywords:Fracture toughness; hybrid composite; critical notch root radius; p-aramid; UHMWPE; 2nd International Conference on Structural Integrity and Exhibition 2018 Fracture behaviour of p-Aramid and ultra high molecular weight polyethylene based hybrid composite Arun Kumar Singh a, b, * , Dharmendra Kumar Shukla b and N Eswara Prasad a a Defence Materials & Stores R & D Establishment (DMSRDE), DRDO, Kanpur-208013 (India) b MechanicalEngg. Department, Motilal Nehru National Institute of Technology, Allahabad-211004 (India) Abstract Damage in the form of delamination an debonding are the most common failure modes observed in polymeric composites used for high end structural applications. The pri cipal aim of this work is to investigate the fracture behaviour of Ultra High Molecular Weight Polyethylene (UHMWPE) and p-aramid b sed hybrid composite. In this work, an optimized proc ssing condition based on highest flexural trength has been evaluated using Box-Behken design of exp riment method to fabricate the hybrid composite. Based on mo t optimized processing co ditions process variable such as 4.2 MPa for pre sur , 120 o C for temper ture and 12.7 minutes for time, compression moulded hybrid composites were prepared and the same wer studied in detail for their interlaminar fracture toughness. In the present study, a f nit notch radius tha varied from 110 – 750 µm has be n employed. The fracture tou hn ss/resistance (K 1c ) of the m terial has been valua ed a d analyz by investigati g he i fluence of varying notch o t radii. The results obtained fro the analysis showed that the criti al notch root radius of the hybrid composite is around 340 µm. The load displacement data of three point bend test with varied crack length are used to evaluate plain strain fracture toughness (K 1c ). The K 1c has been found 1.5 MPa√m for the K Q values derived from specimens with a/W of 0.45-0.55. © 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 pe r-revi w under responsibility of Peer- eview nder esponsibility of the SICE 2018 organizers.

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. * Corresponding author. Tel.: +0-512-2451759; fax: +0-512-2450404. E-mail address: singhak@rediffmail.com Keywords:Fracture toughness; hybrid composite; critical notch root radius; p-aramid; UHMWPE; Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. * Corresponding author. Tel.: +0-512-2451759; fax: +0-512-2450404. E-mail address: singhak@rediffmail.com

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.2019.05.090 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