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) 191–198 Available onlin at www.sci n edirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

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www.elsevier.com/locate/procedia 2 nd International Conference on Structural Integrity and Exhibition 2018 Effect of shape of explosive charge in failure of rolled homogenous armour plate Pankaj K. Choudha a* , A. Kumaraswamy b , Gour Gopal Dutta c , Kusumkant D. Dhote a a Armament Research & Development Establishment, Dr. Homi Bhabha Road, Pashan, Pune – 411021, India b Defence Institute of Advanced Technology, Girinagar, Pune – 411025, India c JCB Center for Advance Technology, Kolkata Abstract Land based munitions are used in defence applications for protecting the boarders of the country. Effect of the munition is studied for achieving the desired target damage. These munitions have explosive charges of cylindrical or rectangular bar shape depending on the requirement of lethality and coverage area. The bar munitions have rectangular section explosive charges of 100 mm×50 mm×600 mm l ngth on either side of fuze cavity to over the tracks. Work h s been carried out to evaluate the effectiveness of these charges initiated from one end. The cross section of the charge will change the pressure generated in the near field of explosive charge. Rectangular and ‘V’ shape charges were evaluated keeping the explosive weight constant. The pressure generated in near field of charge has been simulated using Autodyne software. There is an enhancement of 2.4 to 3.5 times in peak over pressure and 2.5 to 4.1 times in impulse at 70 mm from base of section at initiation point and 600 mm away along the length. However, blast pressure cannot be measured in the near field due to limitation of instrumentation. Both type of section of bar charge were experimentally evaluated. Explosive mass of 1.9 kg in each case have been filled in the polycarbonate casing made from rapid prototype technique. The rolled homogenous armour (RHA) plates of 1000 mm × 500 mm × 40 mm were kept on cement blocks and charge was kept in inverted position. The charges were fired and failure of RHA plate on the front and rear side of plate have been observed. In case of V shape charge, cutting has been observed due to shape charge effect of plastic casing on the front side and failure is severe compared to rectangular section on the back side. © 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 a d peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2 nd International Conference on Structural Integrity and Exhibition 2018 Effect of shape of explosive charge in failure of rolled homogenous ar our plate Pankaj K. Choudha a* , A. Kumaraswamy b , Gour Gopal Dutta c , Kusumkant D. Dhote a a Armament Research & Development Establishment, Dr. Homi Bhabha Road, Pashan, Pune – 411021, India b Defence Institute of Advanced Technology, Girinagar, Pune – 411025, India c JCB Center for Advance Technology, Kolkata Abstract Land based munitions are used in defence applications for protecting the boarders of the country. Effect of the munition is studied for achieving the desired target damage. These munitions have explosive charges of cylindrical or rectangular bar shape depending on the requirement of lethality and coverage area. The bar munitions have rectangular section explosive charges of 100 mm×50 mm×600 mm length on either side of fuze cavity to cover the tracks. Work has been carried out to evaluate the effectiveness of these charges initiated from one end. The cross section of the charge will change the pressure generated in the near field of explosive charge. Rectangular and ‘V’ shape charges were evaluated keeping the explosive weight constant. The pressure gen ated in near field of charge has been si ulated using A todyne softwa . There is an enhancem nt of 2.4 to 3.5 times in peak over pressure and 2.5 to 4.1 times in impulse at 70 mm from base of ectio at initiation point and 600 mm away alon the length. However, blast pressure cannot be m asured in th near fiel due to limitation f instrumenta ion. Both type of section of bar c rge were experimentally evaluated. Explosive mass of 1.9 kg in each case have been filled in the polycarbon e casing made from rapid pr totype technique. The rolled homogenous armour (RHA) plates of 1000 mm × 500 mm × 40 mm were kept on cement blocks and charge was kept in inverted position. The charges were fired and failure of RHA plate on the front and rear side of plate have been observed. In case of V shape charge, cutting has been observed due to shape charge effect of plastic casing on the front side and failure is severe compared to rectangular section on the back side. © 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. 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 Author . 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. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 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.2019.05.025 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.:+91-020-259-32902; fax: +91-020-25865102. E-mail address: pkchoudha@gmail.com Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt * Corresponding author. Tel.:+91-020-259-32902; fax: +91-020-25865102. E-mail address: pkchoudha@gmail.com