PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Sci nceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 226–233 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 Structural integrity of ultrafine grain Al-3%Mg alloy under dynamic loading conditions S Chidambaram a, *, S Giribaskar b , Venkitanarayanan Parameswaran c , Gouthama d a Numaligarh Refinery, A Group Company of Bharat Petroleum Corporation Limited, Assam, India b Advanced Forming Research Centre, University of Strathclyde, 85, Inchinnan Drive, Renfrew, Glasgow, United Kingdom c Department of Mechanical Engineering, Indian Institute of Technology, Kanpur, India d Department of Material Science and Engineering, Indian Institute of Technology, Kanpur, India Abstract Utilization of various materials for constructing dynamic components and equipments has increased ever today. The high speed deformation mechanics was studied in various scale levels, especially in micro and nano scales. Understanding the micromechanics using shock waves led to development of armor plates in military technology. One dimensional elastic stress is applied using Split Hopkinson pressure bar for the ultra-fine grain aluminum samples and microstructural evolution was discussed in detail. The material characterization of equi channel pressing and its effect on stability of material after shock wave testing is provided. The grain size of material is steadily decre s d to obtain ultra-fine grain structure during equi channel pr sing and by application of shock waves on those presse samples, the grain size again increas s within the mat rial. Th recovery, re-crystallization and grain growth was observed in those shock tested samples due to induced temperature during such shock testing. The existing dislocation sub structure in pressed samples devoid after inertia effects. It is pr posed further o understand the interaction between precipitate particle and dislocations. © 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. 2nd International Conference on Structural Integrity and Exhibition 2018 Structural integrity of ultrafine grain Al-3%Mg alloy under dynamic loading conditions S Chidambaram , *, S Giribaskar b , Venkitanarayanan Parameswaran c , Gouthama d a Nu aligarh Refinery, A Group Company of Bharat Petroleum Corporation Limited, A sam, Ind a b Advanced Forming Research Centre, U versity of St athcly e, 85, Inchinnan Drive, Renfrew, Glasgow, United Kingdom c Department of Mechanical E gineer g, Indian Institute of T chnology, Kanpur, India d Department of Material Science and Engineering, Indian Institute of Technology, Kanpur, India Abstract Utilization of various materials for constructing dynamic components and equ pments has incre sed ever today. The high speed defor ation mecha ic was studied in various scale levels, especially in micro and nano scal s. Und rstanding the micromechanics using shock waves led to devel pment of rmor pl tes in ilitary technology. One dimension lastic stress i applied using Sp it Hopkinson pressur b r for the ultra-fine grain aluminum samples nd microstructural volution was di c ssed in detail. The material characterizat on of equi channel pressing and ts effect on stab lity of material after shock wave testing is provided. The grain size of material is st adily decreased to obtain ultra-fine grain structure during equi chan el pressing nd b application of shock waves on those pressed sa ples, the grain size again increases within he m terial. The recovery, re-crystallizati n and grain growth was obse ved in those shock tested samples due to induced emperature uring such shock esting. Th exis ing dislocation sub structure pressed samples devoid a ter inertia effects. It is proposed further to und rstand the interaction between precipitate particle and dislocations. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND lic nse (https://creativecommons.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. Keywords: Ultra-fine grain; Dynamic response; Material behaviour; Shear band deformation Keywords: Ultra-fine grain; Dynamic response; Material behaviour; Shear band deformation

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +91-8253860790. E-mail address: chidambaram.s@nrl.co.in * Correspon ing author. Tel.: +91-8253860790. E-mail address: chidambaram.s@nrl.co.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.2019.05.029