PSI - Issue 13

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 Structural Integrity 13 (2018) 1129–1134 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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. ECF22 - Loading and Environmental effects on Structural Integrity Temperature Dependence of Tensile Deformation and Fracture Micromechanisms in V-Alloyed High-Nitrogen Steel: Effect of Solution-Treatment Temperature Elena Astafurova*, Valentina Moskvina, Galina Maier, Nina Galchenko, Eugene Melnikov, Sergey Astafurov, Antonina Gordienko, Alexander Burlachenko Institute of Strength Physics and Materials Science, Siberian Branch of Russian Academy of Sci nces, Akademichesky pr. 2/4, Tomsk 634055, Russia Abstract For high-nitrogen Fe-19Cr-21Mn-1.5V-0.3C-0.9N (wt. %) steel water-quenched from the different solution-treatment temperatures (1100 ºС and 1200ºС , 1h), the tensile mechanical properties and fracture micromechanisms were investigated in a temperature range of 77K to 673K. Increase in quenching temperature (QT) provides a partial dissolution of precipitates and increases a solid-solution hardening effect in the steel. A yield strength, tensile strength, strain-hardening coefficient and plasticity are QT-dependent characteristics. Independently on QT and test temperature, steel specimens fracture in ductile transgranular mode except for 77K temperature, where dimples an some cleavage comp nents are obs rved on fracture surfaces. The variat on in QT allows one to decrease the fraction of cleavage component: 8% for QT=1100 ºС a d 25% for QT=1200 ºС . © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: high-nitrogen steels; tensile properties; ductile fracture; brittle fracture; cleavage Nitrogen alloying causes some beneficial effects in austenitic steels: enhances the stability of austenite and can be used for partial or entirely replacement of nickel in austenitic stainless steels (ASS), drastically increases strength properties of ASS due to solid solution strengthening effect or/and precipitate hardening, and improve corrosion © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Temperature Dependence of Tensile Deformation and Fracture Micromechanisms in V-Alloyed High-Nitrogen Steel: Effect of Solution-Treatment Temperature Elena Astafurova*, Valentina Moskvina, Galina Maier, Nina Galchenko, Eugene Melnikov, Sergey Ast furov, Antonina Gordi nko, Alexander Burlachenko Institute of Strength Physics and Materials Science, Siberian Branch of Russian Academy of Sciences, Akademichesky pr. 2/4, Tomsk 634055, Russia Abstract For high-nitrog n Fe-19Cr-21Mn-1.5V-0.3C-0.9N (wt. %) ste l water-quenched from the different solution-treatment temperatures (1100 ºС and 1200ºС , h), the tensile mechanical properties and fracture micromechanisms were i vestigated in a temperature range of 77K to 673K. Increase in qu ching temper ture (QT) provides a partial dissolution of precipitat and incre ses a solid-solution hardening effect in the steel. A y eld strength, tensile strength, strain-hardening c efficient nd plasti ity are QT- ependent characteristics. Independently on QT and t st emp rature, steel specimens f acture in ductil transgranular mode except for 77K temperature, where dimples and some cleavag compon nt are observ d on fracture surfac s. The variation in QT allows one to decrease th fraction of c avage component: 8% for QT=1100 ºС and 25% for QT=1200 ºС . © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: high-nitrogen steels; tensile properties; ductile fracture; brittle fracture; cleavage 1. Introduction Nitrogen alloying ca se some beneficial effects in austenitic steels: enhances the stability of austenite and can be used for partial o entirely replacement of nickel in austenitic stainless steels (ASS), drastically increases strength properties of ASS due to solid solution strengthening effect or/and precipitate hardening, and improve corrosion © 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. 1. Introduction

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 o ganizers. * Corresponding author. Tel.: +7-382-228-6865; fax: +7-382-249-2576. E-mail address: elena.g.astafurova@gmail.com * Corresponding author. Tel.: +7-382-228-6865; fax: +7-382-249-2576. E-mail ad ress: elena g.astafurova@gmail.com

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.236