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) 664–667 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 nder the CC BY-NC-ND license (https://creativecommons.org/lice ses/by-nc-nd/4.0/) Selection nd peer-review under responsibility f Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Indentation and hydride orientation in Zr-2.5%Nb pressure tube material T. Narayana Murty, Sandeep A Chandanshive, Mr. Bhupender K. Kumawat & R. N. Singh * Mechanical Metallurgy Division, Bhabha Atomic Research Center,Trombay, Mumbai, India-400085. Abstract In this study, indentations were made on Zr-2.5%Nb pressure tube material to induce multi-axial stress field. An I-shaped punch mark was indented on the Pressure tube material with predefined punch load. Later material was charged with 50 wppm of hydrogen. The samples near t e punch mark were metallographically examined for hydrides orientation. It was observed that hydrides exhibited preferentially circumferential orientation far away from the indent to mixed orientation containing both circumferential and radial hydrides near the indent. This is probably as a result of stress field generated by indentation. Extent of radial hydride formation was observed to be varying with indentation load. © 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: Indentation; Zr-2.5%Nb alloy; Hydrides; Delayed Hydride cracking. 1. In roduction Zirconium alloys are used as structural material in the nuclear reactors because of its excellent mechanical properties and corrosion resistance at high temperatures along with low neutron absorption cross section (Williams (1970); Ibrahim and Cheadle (1985)). Pressure tubes (PT) of pressurized Heavy Water Reactors (PHWR) are made 2nd International Conference on Structural Integrity and Exhibition 2018 Indentation and hydride orientation in Zr-2.5%Nb pressure tube material T. Narayana Murty, Sandeep A Chandanshive, Mr. Bhupender K. Kumawat & R. N. Singh * Mechanical Metallurgy Division, Bhabha Atomic Research Center,Trombay, Mumbai, India-400085. Abstract In this study, ind ntations we made on Zr-2.5%Nb pressure tub m terial t induce multi-axial stress field. An I-shaped unch mark was ind nted on th Pressure tube material with predefined punch load. Lat r materi l was charged ith 50 wppm of ogen. T e sam les n ar the pun h ma k were met ll graphically exa ined for hydrides orientat o . It was observed that hydrides xhibite preferentially circumf re tial orientation f r away from the indent to mix d orientation containing both circumferential and radial hydrid s near th indent. Th s is prob bly as result of stress field generated by indentation. Extent of radial hydride formation was observed to be varying with indentation load. © 2018 The Authors. Published by Elsevier B.V. This is an open access article und r 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. Keywords: Indentation; Zr-2.5%Nb alloy; Hydrides; Delayed Hydride cracking. 1. Introduction Zirconium alloys are used as structural material in the nuclear reactors because of its excellent mechanical properties and corrosion resistance at high temperatures along with low neutron absorption cro s section (Williams (1970); Ibrahim and Cheadle (1985)). Pressure tubes (PT) of pressurized Heavy Water Reactors (PHWR) are made © 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. +91-22-25593817, FAX: +91-22-25505151. * Corresponding author. Tel. +91-22-25593817, FAX: +91-22-25505151.

E-mail address: rnsingh@barc.gov.in E-mail address: rnsingh@barc.gov.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.2019.05.082