PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 142–149 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 Effect of tempering temperature and time on microstructure and mechanical properties of 26MnB5 martensitic steel tubes S Usha Rani a, * M Preethi b a Department of Metallurgical Engineering, PSG College of Technology, Coimbatore - 641 004, India b Corporate Technology Centre, Tube Investment of India Ltd, Chennai - 600 054, India Abstract Anti-roll bar, sway or stabilizer bar, is a part of automobile suspension system. It connects the right and left of the vehicle and resists swaying of the vehicle in sharp curves or road irregularities. This tubular component undergoes fatigue failure during service. In the current paper, the effect of tempering temperature and tempering time on fatigue properties of 26MnB5 steel is discussed. The electric resistance welded tubes made of 26MnB5 were hardened above Ac3 temperature in a sealed quench furnace. The tempering is done at 400°C, 450°C, 500°C for 15, 30 and 60 minutes. The microstructure and the mechanical properties have been analyzed by means of optical microscopy, hardness testing and tensile tests. The tubes were then bent to shape and tested for fatigue. In this paper, the effect of tempering temperature and tempering time on microstructure and mecha ical properties are discussed nd compared with the fatigue properties of the component. © 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: 26MnB5; Tempering temperature; electric resistance welded tube; martensite; anti roll bars; fatigue 1. Introduction The axle stabiliz r bar (ASB) is a part o any automobile suspension system. They are also called anti-roll bars, sway bar or torsional bar. They are usually a bent rod or tubular structure, which is connected to both the sides of the 2nd International Conference on Structural Integrity and Exhibition 2018 Effect of tempering temperature and time on microstructure and mechanical properties of 26MnB5 martensitic steel tubes S Usha Rani a, * M Preethi b a Department f Metallurgical Engine ring, PSG College of Technology, Coimbatore - 641 004, India b Corporate Technology Centre, Tube Investment of India Ltd, Chennai - 600 054, India Abstract Anti-roll bar, sway or stab lizer bar, is a part of aut mobil suspension sys em. It connects the right and lef of the vehicle a d r sists swaying of the vehicle in sharp curves o road irr gula ities. This tubular component undergoes fatigue failure during service. In t e current paper, the eff ct of empering temperature and t mpering time n fatigue properties of 26MnB5 ste l is discussed. The electric resista ce welded tubes made of 26MnB5 were hardened above Ac3 temperat re i a s aled quench furnace. T e t mp ring is done at 400°C, 450°C, 500°C f r 15, 30 and 60 minutes. The microstructure and the mecha ical pro rties have been analyz d by means of optical micr scopy, hardness testing and tensile tests. The tubes were then b nt to shape and t sted for fatigue. In this paper, the effect of temp ing temperatur and tempering time on microstructure and m chan cal properties are discussed and compared with t e fatigue properties of the compo ent. © 2018 The Authors. Published by Elsevier B.V. This is a open access article under 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. Keywords: 26MnB5; Tempering temperature; electric resistance welded tube; martensite; anti roll bars; fatigue 1. Introduction The axle stabilizer bar (ASB) is a part of any automobile suspension system. They are also called anti-roll bars, swa bar or torsional bar. They r usually a bent rod or tubular structure, which is connected to both the sides of the © 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.: +91-9788884861; fax: +0-000-000-0000 . E-mail address:usharani1011 @gmail.com, preethim@tii.murugappa.com * Correspon ing a t o . Tel.: +91-9788884861; fax: +0-000-000-0000 . E-mail address:usharani1011 @gmail.com, preethim@tii.murugappa.com

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.2019.05.019