PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 673–68 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Investigations of ductile damage in DP600 and DC04 deep drawing steel sheets during punching Kerim Isik a, *, Gregory Gerstein b , Florian Gutknecht a , Till Clausmeyer a , Florian Nürnberger b , Hans Jürgen Maier b , A. Erman Tekkaya a a Institute of Forming Technology and Lightweight Construction, Technical University of Dortm nd, Baroper Str. 303, 44227 Dortmund, Germany b Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, An der Universität 2, 30823 Garbsen, Germany The paper presents numerical and microstructural investigations on a punching process of 2 mm thick steel sheets. The dual phase steel DP600 and the mild steel DC04 exhibit different damage and fracture characteristics. To distinguish the void development and crack initiation for both materials, interrupted tests at varied punch displacements are analyzed. The void volume fractions in the shearing zone are ide tified by sc nning electron microscopy (SEM). The Gurs n model family, which is recently extende for shear fracture, is utilized to model th elastoplastic behavior with ductile damage. The effect of the shear governing void growth parameter, ntroduced by Nah hon and Hutchinson (2008), is discussed. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Punching; Gurson model; dual phase ste l; mild ste l; shear fracture; SEM Sheet metal cutting operations such as blanking, fine blanking, trimming, guillotining and punching aim to separate a certain amount of the material from the remaining sheet by using a controlled shearing and fracture at the contour of cut. The properties of the resulting surface of cut depend n the proportion of the sheared and fractured regions. To this proportion, plastic flow, friction and fracture contribute simultaneously (Atkins, 1981). Material properties and process parameters such as sheet thickness, clearance, punch and die radii etc. define the cut surface properties. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Investigations of ductile damage in DP600 and DC04 deep drawing steel sheets during punching Keri Isik a, *, Gregory Gerstein b , Florian Gutknecht a , Till Clausmeyer a , Florian Nürnberger b , Hans Jürgen Maier b , A. Erman Tekkaya a a Institute of Forming Technology and Lightweight Construction, Technical University of Dortmund, Baroper Str. 303, 44227 Dortmund, Germany b Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, An der Universität 2, 30823 Garbsen, Germany Abstract The paper presents numerical and microstructural investigations on a punching process of 2 mm thick steel sheets. The dual phase ste l DP600 and he ild steel DC04 exhibi different damage and fracture cha a t ristics. To distinguish t void development and crack initiation for both materials, interrupted t sts at v ri d punch displacements are analyzed. The void volume fractions in the shearing zone are iden ified by scanning electron microscopy (SEM). The Gurso model f mily, w ich is recently extended for s ar fracture, is utilized o m l the elastoplastic behavi r with ductile damage. The effect of the s ear gover ing void growth par meter, in rod ced by Nahshon and utchinson (2008), is d scus ed. © 2016 The Authors. Publis ed by Elsevier B.V. Peer-revi w under esponsibility of th Scientific Committee of ECF21. Keywords: Punching; Gurson model; dual phase steel; mild steel; shear fracture; SEM 1. Introduction Sheet metal cutting operations such as blanking, fine blanking, trimming, guillotining and punching aim to separate a certain amou t of the material from the remaining sh et by using a controlled shear fracture at the contou of cut. The properties of the r sulting surfac of cut dep nd on the prop r i n of t sheared and fractured regions. To this pr portion, pla tic flow, friction and fractur contribute simultaneously (A kin , 1981). Material propertie and process arameters su h as sheet thick ess, clearance, punch and die radii etc. defi e the cut surface properties. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 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. Abstract 1. Introduction

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review und r responsibil ty of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +49-231-755-6918; fax: +49-231-755-2489. E-mail address: Kerim.Isik@iul.tu-dortmund.de * Corresponding author. Tel.: +49-231-755-6918; fax: +49-231-755-2489. E-mail a dress: Kerim.Isik@iul.tu-dortmund.de

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.087