PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 401–408 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Influence of long-term operation on structure, fatigue durability and impact toughness of 09Mn2Si pipe steel S.V. Panin a,b *, I.V. Vlasov a,b , P.O. Marushchak c , A.V. Eremin a,b , A.V. Byakov a,b , F. Berto d , A.Yu. Vinog adov d , A.S. Syromyatnikova e,f and R. Stankevich b a Institute of Strength Physics and Materials Science SB RAS, , 2/4, pr. Akademicheskii, Tomsk, 634055, Russia b National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk, 634050, Russia c Ternopil Ivan Pul’uj National Technical University, 56, Ruska str. Ternopil, 46001, Ukraine d Norwegian University of Science and Technology, Richard Birkelands vei 2b, 7491 Trondheim, Norway e North-Eastern Federal University, 58, Belinsky str., Yakutsk, 677027, Russia f V.P. Larionov Institute of Physical and Technical Problems of the North SB RAS, 1, Oktyabr’skaya str., Yakutsk, 677980, Russia Abstract. A comprehensive study of the structure, mechanical properties including impact toughness of 09Mn2Si steel used for constructing main gas pipeline” Mastakh -Berge- Yakutsk” after 37 years of operation was carried out. A comparative analysis of the results obtained for the emergency stock steel was conducted. It is shown that long-term operation does not give rise to a substantial redistribution of cementite. Deformation aging is slightly expressed and is manifested through the precipitation of finely dispersed carbides in the grain bulk. The revealed structure degradation does not practically make sense under static tension or hardness measurement. At the same time, under cyclic testing the microstructure degradation being occurred during long-term operation results in fatigue lifetime decrease especially at the stage of crack initiation. The most pronounced manifestation of structure changes is related to decreasing impact toughness of 09Mn2Si steel which reaches ~ 2 times under negative temperatures. The reasons and mechanisms of the observed phenomena are discussed. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: pipe steel 09Mn2Si; long-term operation; microstructure degradation; embrittlement; impact toughness; fatigue durability. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Influence of long-term operation on structure, fatigue durability and impact toughness of 09Mn2Si pipe steel S.V. Panin a,b *, I.V. Vlasov a,b , P.O. Marushchak c , A.V. Eremin a,b , A.V. Byakov a,b , F. Berto d , A.Yu. Vinogradov d , A.S. Syromyatnikova e,f and R. Stankevich b a Institute of Strength Physics and Materials Science SB RAS, , 2/4, pr. Akademiche kii, Tomsk 634055, Russia b Nationa Research Tomsk Po yt University, 30, Lenin Avenue, Tomsk, 634 50, Russia c Ternopil I an Pul’uj Nation l Technica University, 56, Ruska str. Ternopil, 46001, Ukraine d Norwegian University of Science and Technology, Richard Birkelands vei 2b, 7491 Trondheim, Norway e North-Eastern Feder l University, 58, Belinsky str., Yakutsk, 677027, Rus ia f V.P. Larionov Institute of Physical and T chnical Problems of the North SB RAS, 1, Oktyabr’skaya str., Yakutsk, 677980, Russia Abstra . A comprehensive study of the structure, mechanical properties including imp ct toughness of 09Mn2Si st el used for construc ing main gas pip line” Mastakh -Berg - Yakutsk” after 37 years f operati was carri d out. A comparative analysis of the results obtained for the emergency stock steel was conducted. It is shown th t long-term op ration does not give rise to a substantial r distribution of cem ntite. Deformation aging is slightly expressed and is manifested through the precipitation of fi ely dispersed carbide in th grain bulk. The reveale structure degradation doe not practically make s nse under static te sion or hardness measurement. At the sa e tim , under cyclic tes ing the microstructure degradation being occurred during long-t rm operation results in fatigue life ime decrease especially at the stage of crack initiation. The most pronounced manifestation of structure changes is related to decreasing impact toug ness of 09Mn2Si steel which reaches ~ 2 times under negative temperatures. The reasons and mechanisms of the observed phenomena are discussed. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: pipe steel 09Mn2Si; long-term operation; microstructure degradation; embrittlement; impact toughness; fatigue durability. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

1. Introduction 1. Intro uction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

Main oil and gas pipelines are strategic industrial facilities and monitoring their mechanical state as well as Main oil and gas pipelines are strategic industrial facilities and monitoring their mechanical state as well as

* Corresponding author. Tel.: +7-38-22-286-904. E-mail address: svp@ispms.tsc.ru * Correspon ing author. Tel.: +7-38-22-286-904. E-mail address: svp@ispms.tsc.ru

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.188 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.