PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Available online at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 14 9 78–88 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/) Sel tion and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Effect of primary α phase fraction on tensile behavior of IMI 834 alloy Amit Singh a , I. Balasundar b,* , J.P. Gautam a , T.Raghu b a Department of Materials Engineering, School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad 500046, India b Near Net Shape Group, Aeronautical Materials Division, Defence Metallurgical Research Laboratory, Hyderabad 500058, India Abstract In the present work, the tensile behavior of IMI 834 alloy with varying primary α (α p ) fraction in the transformed β matrix was studied at room temp rature . V riation in α p phase fraction was obtained by changing the solution treatment temperature of the material in the α+β region from 1288K to 1333K. All the solution treated samples were then aged at 973K for 2hrs and cooled in air . Final microstructures consisted of various α p fractions (0.045 to 22 %) along with incoherent silicide precipitate (Ti, Zr) 6 Si 3 and coherent Ti 3 Al precipitates which resulted in bimodal and lamellar microstructures. The α p phase fraction for bimodal microstructure was ranging from 3 to 22 % and that for lamellar microstructure 0 to 1 %. Tensile test results show that tensile strength increased with increase in α p up to ~ 15 % and further increase in α p from ~15 % to 22 % lead to decrease in tensile strength. The tensile test result also shows improvement in strain hardening with increase in α p . The higher tensile strength for samples with α p fraction up to ~ 15 % and lower tensile strength for sample with α p fraction ~15% - 22 % is attributed to effective slip length and solute partitioning effect, respectively. © 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: Primary α phase; IMI 834 Ti alloy; Strain hardening; Tensile strength ; 2nd International Conference on Structural Integrity and Exhibition 2018 Effect of primary α phase fraction on tensile behavior of IMI 834 alloy Amit Singh a , I. Balasundar b,* , J.P. Gautam a , T.Raghu b a Department of Materials Engineering, School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad 500046, India b Near Net Shape Group, Aeronautical Materials Division, Defence Metallurgical Research Laboratory, Hyderabad 500058, India Abstract In th present work, the tensile beh vior of IMI 834 ll y with varyi g primary α (α p ) fracti n n the transformed β matrix was studied at room temperature . Variation in α p phase fraction was obtain by changing t solution treatment temperature of the mater al in the α+β region from 1288K to 1333K. All the olution reated samples ere then aged at 973K for 2hrs and cooled in ir . Final microstructu s consi ted of vario s α p fract ons (0.045 to 22 %) along with incoherent silicide precip tate (Ti, Zr) 6 Si 3 and coherent Ti 3 Al precipitates which resulte in bimodal and lamella microstructures. The α p phas fraction for bimodal microstructure was rang g from 3 to 22 % and that for lamellar microstructure 0 to 1 %. Tensile test results show that increased wi h increase in α p up to ~ 15 % and further increase in α p from ~15 % to 22 % lead to decrease i tensile trength. The tensile test result also shows improvement in strain hardening with increase in α p . The higher tensile strength for amples with α p fraction up to ~ 15 % and lower tensile strength for sample with α p fraction ~15% - 22 % is attributed to effective slip length and solute partitioning effect, respectively. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by-nc-nd/4.0/) Selection and pe r-review under responsibility of P er-review und r 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. 1. Introductio Keywords: Primary α phase; IMI 834 Ti alloy; Strain hardening; Tensile strength ;

1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Near alpha titanium alloy IMI 834 (Ti-Al-Sn-Zr) was designed for high temperature application up to 873 K. The Near alpha titanium alloy IMI 834 (Ti-Al-Sn-Zr) was designed for high temperature application up to 873 K. The

* Corresponding author. Tel: +91 4024586741; Fax: +914024340640 E-mail Address : i_balasundar@dmrl.drdo.in * Corresponding author. Tel: +91 4024586741; Fax: +914024340640 E-mail Address : i_balasundar@dmrl.drdo.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 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.

* 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.2019.05.011