PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 6 5–611 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 licens (https://creativecommons.org/license /by-nc-nd/4.0/) Sel tio and peer-review under responsibility of Peer-review under responsibility of t e SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Creep studies of Cold Worked Austenitic Stainless Steel Hari Krishan Yadav a * , A.R. Ballal a , M.M Thawre a , V.D. Vijayanand b a Department of Metallurgical & Materials Engineering, VNIT Nagpur-440010, India b Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India Abstract Ti modified 14Cr-15Ni austenitic stainless steel (SS) has been developed for nucl ar fuel cladding and wrapper material for its superior creep strength and better void swelling resistance during service. Cold working induces high dislocation density network in the material. These dislocations interact with point defects, which are generated by neutron irradiation during service and facilitate recombination to make the material more void swelling resistant. In present investigation, creep behavior of various cold worked (up to 40%) samples in comparison with mill annealed samples was studied. Initially, the steel was solution treated at 1333 K for 30 minutes followed by cold rolling at room temperature. Uniaxial creep test was performed at 973 K for 200 MPa stress level. The effects of cold work as well as stress on creep behavior have been studied in this investigation. Cold worked samples exhibited better creep strength as compared to mill annealed samples. During creep exposure at 973 K, material showed phenomena of recovery as well as recrystallization due to initial cold working. This partial recovery and recrystallization in material also depend upon the applied stress and led to variation in creep strength of the material. Precipitation of carbides particles was seen to be accelerated at the grain boundaries and this phenomenon was more prominently observed in cold worked samples. © 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: Cold work; creep rupture; recrystallization; dislocations 2nd International Conference on Structural Integrity and Exhibition 2018 Creep studies of Cold Worked Austenitic Stainless Steel Hari Krishan Yadav a * , A.R. Ballal a , M.M Thawre a , V.D. Vijayanand b a Department of Metallurgical & Materials Engineering, VNIT Nagpur-440010, India b Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India Abstract Ti modified 14Cr-15Ni austenitic stainless steel (SS) has bee develop d f r nuclear fuel claddin and wr pper material for its superior cr ep strength and bet er vo d swelling resistance during service. Cold working induces high dislocation density network in the mat rial. These disloc tions interact with point efects, which are ge erated by n u ron irradiation during service and facilitate r combination to ak the material more void swelling resistant. In present inves gation, cre p behavior f various cold worked (up to 40%) sampl s in compariso wi h mill annealed samples was studied. Initially, the steel was solution treated a 1333 K for 30 minu es oll wed by cold ro ling at room temperature. Uniaxial cr ep est was performed at 973 K f r 200 MPa tress level. Th eff cts of cold work as well as stress on creep b havior have bee studied in this investigation. Cold w rk samples exhibited better creep strength as comp red to mill a ne ed samples. During creep exposure at 973 K, material sh wed phenomena f recovery as w ll as r crystalliz tion ue to i it al cold working. This partial recovery and recrystallization in ma erial also d pend upon the applied stress and led to varia ion in creep strength of the materia . Precipitation f carbid s p rticl was seen to be accelerated at the grain boundaries and this phenomenon was more prominently observed in cold worked samples. © 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-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

Keywords: Cold work; creep rupture; recrystallization; dislocations

© 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.: +91-721-2801517 E-mail address: hkyadav.vnit@gmail.com * Correspon ing author. Tel.: +91-721-2801517 E-mail address: hkyadav.vnit@gmail.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.2019.05.074