PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 514–52 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. © 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. 2nd International Conference on Structural Integrity and Exhibition 2018 Finite Element Simulation of Armor Steel used for Blast Protection Kartikeya a , Sanjay Prasad b , Naresh Bhatnagar a * a Indian Institute of Technology Delhi, New-Delhi-110016, India b Indian Institute of Technology Dhanbad, IIT-ISM Dhanbad-826004, India Abstract Safety of defense and paramilitary operators in hostile environments can be ensured by using ballistic materials. Various destructive and non-destructive techniques are available for characterizing ballistic materials and performance of respective products but they can be expensive and protracted. Finite Element method (FEM) is useful in these situations as it can be used during design phase to determine critical design sections and material performance in products. This study focuses on FE simulation of ARMOX armor steel used for blast protection in anti-la d mine vehicles using CONWEP method to simulate blast. Plate is modeled as deformable solid with Johnson-Cook plasticity. Parametric study is performed to determine appropriate element size. Results of numerical simulation were validated from results of experiments published earlier by various researchers. Layered and laminated steel plates of varying thicknesses were tested to assess blast protection as against monolithic armor plate using developed numerical model. Results showed that layered steel plates performed worse and laminated plates performed better than monolithic armor steel plates. © 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: Blast; Numerical Simulation; Armor Steel; Ballistic. 1. Introduction An air-blast generates a pressure wave which on interaction with structures deforms them, rendering them unusable. Ballistic materials are used to prevent structures and vehicles from excessive deformations. Steels, 2nd International Conference on Structural Integrity and Exhibition 2018 Finite Element Simulation of Armor Steel used for Blast Protection Kartikeya a , Sanjay Prasad b , Naresh Bhatnagar a * a Indian Institut of Technology Delhi, New-Del i-110016, India b Indian Institute of Technology Dhanbad, IIT-ISM Dhanbad-826004, India Abstract Safety of defense and paramilitary operators in hosti environments can e ensured by u ing ballistic materials. Various destru tive and non-destructive tech iques are availabl for characterizing ballistic mater als and performance of respective products but they can be xpensive and protracted. Fin te Element method (FEM) is useful in the e situations as it can be used during design phase to dete mi e critical design secti ns and material p rform nce i products. This stu y focuses on FE simulation f ARMOX armor st el used for blast protecti n in anti-land mine vehicles using CONWEP method to simulate bl st. P ate is modeled as deformabl solid with Joh son-Cook pl sticity. Pa ame ric study is p rformed to et rm ne appropriate element size. Results of numerical simulation were validated from r sul s of experimen s published e rlier by var ous resea chers. Layere and lami ated steel plat s of varying thicknesses w r te d to ssess blast protection s ag inst monolithic arm plate using devel ped numerical mode . Results showed that layered steel plates performed worse and laminated plates performed better than monolithic armor steel plates. © 2018 The Authors. Published by Elsevier B.V. This is a open access article und r the CC BY-NC-ND license (https://creat vecommons.org/licenses/by- c-nd/4.0/) Selection and pe r-review under responsibility of Peer-review u d r responsibility of the SICE 2018 organizers. Keywords: Blast; Numerical Simulation; Armor Steel; Ballistic. 1. Introduction An air-bl st gener tes a pressure wave which on interaction with structures deforms them, rendering them unusable. Ballistic materials are used to prevent structures and vehicles from excessive deformations. Steels, © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +91-11-2659-1139; fax: +91-11-2658-2053. E-mail address: nareshb@mech.iitd.ac.in * Correspon ing author. Tel.: +91-11-2659-1139; fax: +91-11-2658-2053. E-mail address: nareshb@mech.iitd.ac.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.2019.05.066