PSI - Issue 2_A

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 Struc ural Integrity 2 (2016) 170 –17 7 Available online at www.sciencedirect.com ScienceDire t 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 Analysis of sh ar cutting of dual phase steel b application of an advanced damage model Florian Gutknecht a, *, Frank Steinbach a , Tobias Hammer b , Till Clausmeyer a , Wolfram Volk b , A.Erman Tekkaya a a Institute of Forming Technology and Lightweight Construction (IUL), TU Dortmund, Germany b Institute of Metal Forming and Casting (utg), Technische Universität München, Germany Abstract Shear cutting is still the most preferred process in industry for separation of sheets. An enhanced fully-coupled Lemaitre model is applied for the description of the material behaviour. The local damage model considers the influence of shear and compression-dominated stress states on the propagation of damage. A time-efficient approach for parameter identification is used to obtain proper material parameters from different tensile and torsion tests. Shear cutting experiments for dual phase steel are performed to validate the simulation model. An accurate prediction of the cutting force is obtained with the process model. Furthermore, it is shown that the triaxiality at fracture has to be considered in combination with th predicte geomet y to determine the haracte is ics f the cutting surface, i.e. the burnish and the fracture zone. © 2016 The Authors. Published by Elsevier B.V. Peer-revi w under responsibility of the Scientific C mmittee of ECF21. Keywords: fem, sh ar cutting, lemaitr , triaxiality, blanking, dual phase ste l 1. Introduction The Finite-Element-simulation of entire blanking process including fracture may yield valuable information for users of this technology. As blanking operations occur in the process chain of virtually all sheet metal parts, reliable prediction and analysis of the physics of the blanking process has high technological relevance. Knowledge of the 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Analysis of shear cutting of dual phase steel by application of an advanced damage model Florian Gutknecht a, *, Frank Steinbach a , Tobias Hammer b , Till Clausmeyer a , Wolfram Volk b , A.Erman Tekkaya a a Institute of Forming Technology and Lightweight Construction (IUL), TU Dortmund, Germany b Institute of Metal Forming and Casting (utg), Technische Universität München, Germany Abstract Shear cutting is still the most preferred process in industry for separation of sheets. An enhanced fully-coupled Lemaitre model is applied for th descri tion of the material behaviour. The local damage mod l considers the influenc of sh ar and compression- omina ed stress states on the propagation of damage. A time-efficie t app oach for parameter identification is u ed to btain proper ma erial parameters from dif erent tensile and tors on tests. Shear cutting exp im s for dual phase steel are pe formed o v idate the simulation model. An accura e prediction of the force is obtaine with th process model. Fur hermore, i is hown that the triaxiality at fracture has to b onsidered in combination with the predicted geometry to determine the characteristics of the cut ing surface, i.e. th burn sh and the fracture zone. © 2016 The Authors. P blished by Elsevier B.V. Peer-review und r espons bility of the Scientific Committee of ECF21. Keywords: fem, shear cutting, lemaitre, triaxiality, blanking, dual phase steel 1. Introduction The Finite-Element-simulation of entire blanking process including fracture may yield valuable information for users of this technology. As blanking operations occur in the process chain of virtuall a l sheet m tal pa ts, reliable pr diction and a alysis of the physics of the blanking proc ss has hig technological re evance. Knowledge of th 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.

* 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 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.: +49-231-755-8483; fax: +49-231-755-2489. E-mail address: Florian.Gutknecht@iul.tu-dortmund.de * Corresponding author. Tel.: +49-231-755-8483; fax: +49-231-755-2489. E-mail address: Florian.Gutknecht@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.2016.06.215