PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 127–133 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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www.elsevier.com/locate/procedia 2nd International Conference on Structural Integrity and Exhibition 2018 Investigations of Process Parameters on the Mechanical Properties of MTV Decoy Flare Pellets for Defence Applications Sukamal Adhikary a , Himanshu Sekhar b , D G Thakur a a Defence Institute of Advanced Technology, Pune – 411027. dineshsingh_thakur@yahoo.com b High Energy Materials Research Laboratory, Pune-411021. himanshudrdo@rediffmail.com 2nd International Conference on Structural Integrity and Exhibition 2018 Investigations of Pr cess Param ters on th Mechani l Properties of MTV Decoy Flare Pellets for Defence Applications Sukamal Adhikary a , Himanshu Sekhar b , D G Thakur a a D fence Institute of Advanced Technology, Pune – 411027. dineshsingh_thakur@yahoo.com b High Energy Materials Research L boratory, Pune-411021. himanshudrdo@rediffmail.com 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. The Infrared (IR) guided missiles have posed serious threats to aircrafts flying even at considerably high altitude. An effective counter measure to this imminent threat of the heat seeking missiles is IR decoy flares constituting of Magnesium/Teflon/Viton (MTV) based pyrotechnic composition. The provisioning of MTV flares primarily for defence applications globally is controlled by very few foreign firms who have ensured that the manufacturing techniques and performance parameters are closely guarded owing to economic as well as strategic reasons. Hence, there are limited research paper available which illustrates the mechanical pressing of the MTV composition to form pellets and the performance evaluation of these pellets. T e pres nt paper is an attempt to study the density of 50 mm diameter pellets by varying the charge mass of pellets and the applied load to compact the MTV composition. The applied load is varied in steps of 1 ton for a fixed pyrotechnic charge mass mixture of 100 gm for a fixed dwell time of 15 seconds. It is observed that the density of pellets increased with increase in application of load up to an applied load of 8 tons. This phenomenon is owing to reduction in porosity of the mixture as well as brittl fracture of magnesium particles facilitating optimisation of density of pellets. Similar phenomenon was obs rved by varying the charge mass and the optimum density was obtained for a L/D ra io nearing unity. Thus, the range of process pa ameters which is found to be of interest for development of pellets of this dimension is 100 gm to 140 gm of charge mass and 6 tons to 8 tons of applied load. © 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: Pyrotechnic; Infra-red decoy flares; MTV; Density; E-mail address: dineshsingh_thakur@yahoo.com Abstract The Infrared (IR) guided missiles have posed serious threats to ai crafts flying even at considerably high altitude. An effective counter mea ure to this imminent threat of the heat seeking missiles is IR decoy flares constituting of Magnesium/Teflon/Viton (MTV) based pyr technic composition. The provisioning of MTV flares primarily for defen e ap lications globally is cont olled by v ry few fo ign firms who have ensured that the manufacturing t chniques and performa ce parameters are closely guarded owing to economic as well as strategic reasons. Hence, there are limited research papers available which illustr tes the mechanical pressing of th MTV composition to form pellets and the performance evaluation of these pellets. Th present pape is an attempt to study the density of 50 mm diameter pellets by varying the charge mass of pellets and the applied load to compact the MTV composition. The applied load is varied in steps of 1 ton for a fixed pyrotechnic charge mass mixture of 100 gm for a fixed dwell time of 15 seconds. It is obs rved that the density of pellets increased with increase in application of load up to an appli d load of 8 to s. This pheno non is owing to reductio in porosity of the mixture as well a brittle fractu e f magn sium particl s facilitating opti isation of d sity of pellets. Similar phenomen n was observed by varying the charge mass and th optimum density was obtained for a L/D ratio n aring unity. Thus, the range of process parameters which is found to be of interest for development of pellets of this dimension is 100 gm to 140 gm of charge mass and 6 tons to 8 tons of applied load. © 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-review und r r sponsibility of Pe r-review under responsibility of the SICE 2018 organizers. Keywords: Pyrotechnic; Infra-red decoy flares; MTV; Density; E-mail address: dineshsingh_thakur@yahoo.com © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2019 The Authors. Published y 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. 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. Abstract

* 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.2019.05.017