PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 172 –1724 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. ECF22 - Loading and Environmental effects on Structural Integrity Experimental study of mechanical properties of steel 40Cr in the necking area of specimen during the postcritical deformation Tretyakov M.P. a *, Tretyakova T.V. a , Wildemann V.E. a a Center of Experimental Mechanics, Perm National Research Polytechnic University, 29 Komsomolskiy Ave., Perm, 614990, Russia The work is devoted to the experimental study of the evolution of mechanical properties of the structural steel 40Cr during postcritical deformation of solid cylindrical specimens in conditions of strain localization formation in the form of neck at tension. The methodical issues of providing tests by ‘ specimen from specimen ’ scheme are observed. Different levels of preliminary postcritical deformation of initial samples are realized, and the results of testing specimens cut from the initial samples with a neck are obtained. To measure the displacement and strain fields in the gauge length of specimens with the neck the noncontact 3D video system Vic 3D, based on the digital images correlation technique, was used. On the base of test results, the stiffness and strength of steel 40Cr were evaluated in a necked specimen at various stages of postcritical deformation. The hardness distribution on the specimen after necking was analyzed too. It is shown that the material in the peripheral areas of the gauge length of the sample is in a strengthened state, which does not depend on the degree of previously achieved postcritical deformation, and the strength of the material in the neck-forming zone on the initial specimens is thereby increased. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: postcritical deformation stage, tension, strain localization, necking effect, hardness, digital image correlation. © 2018 The Authors. P blished by Elsevier B.V. Peer-review und responsibility of the ECF22 organiz rs. ECF22 - Loading and Environmental effects on Structural Integrity Experimental study of mechanical properties of steel 40Cr in the necking area of specimen during the postcritical deformati n Tretyakov M.P. a *, Tretyakova T.V. a , Wildemann V.E. a a Center of Experimental Mechanics, Perm National Research Polytechnic University, 29 Komsomolskiy Ave., Perm, 614990, Russia Abstract The work is devoted to the experimental study of the evolution of mechanical properties of the structural steel 40Cr during postcritical deformation of s li cylindrical specimens in c nditions of strain localization formation in the form of neck at tension. The methodi l issues of providing tests by ‘ specimen from specimen ’ scheme are observed. Different levels f preliminary postcritical deformation of initial sampl s a e realized, and the results of testi g specimens cut from the initial sample with a neck are obtained. To me sure the displace ent nd strain fields in the gauge length of specimens with the n ck the noncontact 3D video system Vic 3D, based on t igit l i ages correl tion techniqu , was us d. On the base of test results, the stiff ess a d strength of steel 40Cr were evaluated in a necked specimen at various stag s of po tcritical deformation. The hardn ss distribution on the specimen after n cking was a alyz d too. It is shown that the m t rial in the peripheral are s f the gauge length of the sample is in a strengthened state, which does not depend on the degree of previously achieved postcritical deform tion, and the str ngth of the m terial in th neck-forming z ne on th initial specim ns is thereby increased. © 2018 The Authors. Published by Elsevier B.V. Peer-review under esponsibility of the ECF22 organizers. Keywords: postcritical deformation stage, tension, strain localization, necking effect, hardness, digital image correlation. 1. Introduction Studying the various a p cts of deformation processes, accumulation of damages and destruction of structural materials are attract the attention f many scientists due to the importance of understanding the mechanisms that lead to material failure and to the ever-increasing demands on reliability a d safety of critical structural elements. In the © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Studying the va ious aspects of deformation processes, accumulation of damages and destruction of structural materials are attract the attention of many scientists due to the importance of understanding the mechanisms that lead to material failure and to the ever-increasing demands on reliability and safety of critical structural elements. In the Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction

* Corresponding author. Tel.: +7-342-239-1111; fax: +7-342-239-1224. E-mail address: cem_tretyakov@mail.ru * Corresponding author. Tel.: +7-342-239-1111; fax: +7-342-239-1224. E-mail address: cem_tretyakov@mail.ru

* 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.

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.2018.12.361