PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 564–57 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. 2nd International Conference on Structural Integrity and Exhibition 2018 Study on the Low and High Strain Rate Behavior of Fumed Nano Silica Dispersions Neelanchali Asija Bhalla a, b* , Hemant Chouhan a , Aisha Ahmed a , Kartikeya a , Naresh Bhatnagar a a Mechanical Engineering Department, Indian Institute of Technology Delhi, Hauz Khas, New Delhi – 110016, India b Bennett University, Department of Mechanical and Aerospace Engineerung, School of Engineering and Applied Sciences, Greater Noida, Uttar Pradesh – 201310, India Abstract Shear Thickening Fluids (STFs) are a special class of field responsive non-N wtonian fluids which exhibit transition from low viscosity to high viscosity state when they are subjected to shearing deformation above the critical shear rate (CSR). Due to this unique characteristic of STFs, these have found application in ballistics, especially in the development of special class of body armors called Liquid Body Armors (LBAs) which are lighter in weight and more flexible as compared to conventional heavy armours. Fumed silica (FS) is a rheologically significant material as it is a well known viscosity modifier owing to its fractal structure, and is generally used in paints, coatings, sealants, printing inks etc. In this study, two different grades of FS (A-130 and A-150) were used for the synthesis of STFs. The low strain rate studies were conducted on cone and plate rheometer and high strain rate experiments were accomplished on split Hopkinson pressure bar (SHPB) set up. The colloidal dispersions in PPG-400 (Poly Propylene Glycol 400) were synthesized using ultrasonic homogenization technique. From the experiments it was observed that A-150 fumed silica dispersion exhibited higher severity in shear thickening in the low strain rate domain, whereas A-130 fumed silica dispersion exhibited higher specimen stress and compressional strain rate under high strain rate dynamic compressive loading. Thus, it can be inferred that the same material may exhibit different behaviors in the low and high strain rate regimes. Therefore, both the studies play a vital role to completely characterize the material, especially when the material has to be subj cted to ballistic applications. © 2018 The Authors. Published by Elsevier B.V. This is an op n 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 Study on the Low and High Strain Rate Behavior of Fumed Nano Silica Dispersions Neelanchali Asija Bhalla a, b* , Hemant Chouhan a , Aisha Ahmed a , Kartikeya a , Naresh Bh tnagar a a Mechanic l Engineering Department, Indian Institute of Technology Delhi, Hauz Khas, New D lhi – 110016, India b Bennett University, Department of Mechanical and Aerospace Engineerung, School of Engineering and Applied Sciences, Greater Noida, Uttar Pradesh – 201310, India Abstract Shear Thickening Fluids (STFs) ar a special class of field r spo siv non-Newtonian fluids which xhibi transition from low viscosity to high visc sity state wh n th y are subjected t shearing deformation above the critical shear rate (CSR). Due to this unique haracterist c of STFs, these have found applicat on in ballistics, especially in the devel p ent of special class of bod rs called Liquid Body Armors (LBAs) wh ch are lighter in weight and more flexible as compared to conven ional heavy armo rs. Fumed silic (FS) is a rheologi ally signific mater al as it is a well known viscos ty modifier owing to its fractal structure, and i gene ally used in paints, coatings, sealants, printing inks etc. In this study, two different grades of FS (A-130 and A-150) were used for the synthesis of STFs. The low strain rate t dies were conducted on cone an plate rheometer and high strain rate experiments were accomplis d on spl t Hopkinson pressur bar (SHPB) set p. The colloidal disper ions in PPG-400 (Poly Propylene Glycol 400) were synthesized using ultrasonic homogenization technique. From the experi ents it was observed that A-150 fumed silica dispersion exhibited higher severity in shear thickeni g in the low strain ate domain, whereas A-130 fumed ilica dispersion exhibited h gh specimen tress and co pressional strain rate unde high strain rate dynam c compressive loading. Thus, it can be inferred that the sa e materia may exhibit different behaviors in the low and high strain rate regim s. Therefore, b th the studies play a vital role to completely ch racterize the material, especially when the material has to be subjected to ballistic applications. © 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. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 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.

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: Fumed silica; Split Hopkinson Pressure Bar; Shear Thickening Fluids; Rheometer; Ballistics; High strain rate Keywords: Fumed silica; Split Hopkinson Pressure Bar; Shear Thickening Fluids; Rheometer; Ballistics; High strain rate

* Corresponding author. Tel.: +91-120 7199401/ +91-9971392264 E-mail address: neelanchali.bhalla@bennett.edu.in * Correspon ing author. Tel.: +91-120 7199401/ +91-9971392264 E-mail address: neelanchali.bhalla@bennett.edu.in

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.2019.05.069