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) 242–25 Available online at www.sciencedirect.co Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com 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 E ff ect Of Notch Orientation On Fracture Behaviour Of Textured Zr-2.5Nb Material Priti Kotak Shah, Ashwini Kumar, B. N. Rath, J. S. Dubey a Post Irradiation Examination Division,Bhabha Atomic Research Centre, Trombay, Mumbai, India Abstract Zr-2.5Nb pressure tubes are used as primary pressure boundary material in Indian Pressurized Heavy Water Reactors (PHWRs). Due to presence of strong tange ti l basal pole texture in the HCP α -phase of Zr-2.5Nb alloy, the mechanical properties of the pressure tube are di ff erent along axial and circumferential directi ns. As pressure tubes see higher hoop stress, most of the fracture studies have be n carried out on pressure tubes having axial notch or crack orientation. However, in practi e, flaws may be present in material in any orientation. Hence, fracture studies have been carried out on textured Zr-2.5Nb pressure tube to evaluate its fracture properties along axial and transverse directions. Single specimen J-test with Direct Current Potential Drop (DCPD) system was carried out from room temperature to 300 o C using Disc compact tension (DCT) specimens. This paper compares the fracture toughness values in these two di ff erent directions of textured Zr-2.5Nb pressure tube. c 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY- C-ND license (https: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Selection and p er-review unde responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Axial, Transverse, Fracture toughness, Zr-2.5Nb, Texture 1. Introduction Pressure tubes, made of Zr-2.5wt%Nb alloy, are the primary pressure boundary material for the Pressurized Heavy Water Reactors (PHWRs). Cold-worked and stress relieved Zr-2.5Nb tubes are the standard pressure tube material for Indian PHWRs. Zr-2.5Nb alloy has two phase microstructure. The mechanical properties of Zr-2.5Nb are largely dependent on the microstructure and crystallographic texture of the α -phase which constitutes over 90% of the material volume Srivastava et al. (1995); Saibaba et al. (2011); Cheadle (1977). Because the zirconium crystal is hexagonal close-packed and due to the texture developed during tube fabrication, the properties are di ff erent along di ff erent directions of the pressure tube (Song, 2016). The resistance o ff ered by the pressure tube to the initiation and propagation of cracks will depend on fracture toughness of the material. This is evaluated by developing the J-R curves for pressure tube material. Disc compact 2nd International Conference on Structural Integrity and Exhibition 2018 ect f otch rientation n racture ehaviour f extured r-2.5 b aterial Priti otak Shah, sh ini u ar, . . ath, J. S. ubey a Post Irradiation Examination Division,Bhabha Atomic Research Centre, Trombay, Mumbai, India Abstract Zr-2.5Nb pressure tubes are used as primary pressure boundary material in Indian Pressurized Heavy Water Reactors (PHWRs). Due to presence of strong tangential basal pole texture in the HCP α -phase of Zr-2.5Nb alloy, the mechanical properties of the pressure tube are di ff erent along axial and circumferential directions. As pressure tubes see higher hoop stress, most of the fracture studies have been carried out on pressure tubes having axial notch or crack orientation. However, in practice, flaws may be present in material in any orientation. Hence, fracture studies have been carried out on textured Zr-2.5Nb pressure tube to evaluate its fracture properties along axial and transverse directions. Single specimen J-test with Direct Current Potential Drop (DCPD) system was carried out from room temperature to 300 o C using Disc compact tension (DCT) specimens. This paper compares the fracture toughness values in these two di ff erent directions of textured Zr-2.5Nb pressure tube. c 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND licens (https: // creativ commons.org / licenses / by-nc-nd / 4.0 / ) Sele tion and pe r-r view under res on ibili y of P er-review under responsibility of the SICE 2018 orga iz rs. Keywords: Axial, Transverse, Fracture toughness, Zr-2.5Nb, Texture 1. Introduction Pressure tubes, made of Zr-2.5wt%Nb alloy, are the primary pressure boundary material for the Pressurized Heavy Water Reactors (PH Rs). Cold-worked and stress relieved Zr-2.5Nb tubes are the standard pressure tube material for Indian PHWRs. Zr-2.5Nb alloy has two phase microstructure. The mechanical properties of Zr-2.5Nb are largely dependent on the microstructure and crystallographic texture of the α -phase which constitutes over 90% of the material volume Srivastava et al. (1995); Saibaba et al. (2011); Cheadle (1977). Because the zirconium crystal is hexagonal close-packed and due to the texture developed during tube fabrication, the properties are di ff erent along di ff erent directions of the pressure tube (Song, 2016). The resistance o ff ered by the pressure tube to the initiation and propagation of cracks will depend on fracture toughness of the material. This is evaluated by developing the J-R curves for pressure tube material. Disc compact © 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.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt ∗ Corresponding author. Tel.: + 91-22-25594043 ; fax: + 91-22-25505151. E-mail address: pritik@barc.gov.in ∗ Corresponding author. Tel.: + 91-22-25594043 ; fax: + 91-22-25505151. E-mail address: pritik@barc.gov.in

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.2019.05.031 2452-3216 c 2018 The Authors. Publish d l ier . . his und r responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216 c 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. e acce s article under the CC BY-NC-ND license (https: // creativeco mons.org / licenses / by-nc-nd / 4.0 / ) Selection and peer-review