PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 775–78 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t grity Procedia 00 (2018) 000–000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 Cleavage fracture assessment of cold charged steel slabs using experimental and numerical approaches Reza H. Talemi a,b, *, Negar Gilani c , Quang Tien Ngo c , Antônio de Souza Braga Neto a,d , Annick Willems a , a ArcelorMittal Global R&D Gent-OCAS N.V., Pres. J.F. Kennedylaan 3, 9060 Zelzate, Belgium b Present address: Department of Materials E gineering, KU Leuven, 3001 Leuven, Belgium c ArcelorMittal Global R&D Maizières Process, Voie Romaine, F-57283 Maizières-lès-Metz Cedex, France d School of Mines, Federal University of Ouro Preto, Ouro Preto, MG, Brazil Abstract Drop Weight Tear Test (DWTT) set-up has been used to investigate cleavage fracture of steel slabs at different elevated temperatures up to 500°C. Fracture surfaces of broken samples have been analyzed using Scanning Electron Microscope (SEM) to understand ductile and brittle fracture appearances at the elevated temperatures. The eXtended Finite Element Method (XFEM)- based cohesive segment technique has been used to simulate the dynamic crack propagation of the DWTT at all tested temperatures. The obtained numerical results were in good agreement with the observed experiments. Eventually, a hybrid experimental numerical method is proposed to define a set of critical cleavage stresses for cold/hot charged steel slabs. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: AHSS; Steel slab; Continuous casting; Cleavage fracture; Numerical modelling; DWTT; XFEM; Cohesive zone 1. Introduction During production process of Advanced High Strength Steel (AHSS) some steel slabs are subjected to undesired cleavage fracture. Brittle cracks are formed during casting process or at different process steps after continuous casting. For instance, during reheating in the hot strip mill furnace, cooling in the slab yard and transportation. These steel © 2018 The Authors. P blished by Elsevi r B.V. Peer-review und responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Cleavage fracture assessment of cold charged steel slabs using experimental and numerical approaches Reza H. Talemi a,b, *, Negar Gilani c , Quang Tien Ngo c , Antônio de Souza Braga Neto a,d , Annick Willems a , a ArcelorMittal Global R&D Gent-OCAS N.V., Pres. J.F. Kennedylaan 3, 9060 Zelzate, Belgium b Present address: Department of M terials Engineering, KU Leuve , 30 1 Leuven, Belgium c ArcelorMittal Global R& Maizières Process, Voie Romaine, F-57283 Maizière -lès-Metz Cedex, France d School of Mines, Federal University of Ouro Preto, Ouro Preto, MG, Brazil Abstract Drop Weight Tear Test (DWTT) set-up has been used to investigate cleavage fracture of steel slabs at different elevated tem eratures up to 500°C. Fracture surfaces of broken samples have been analyzed using Scanning Electron Microscope (SEM) to understand ductile and brittle fracture appearances at the elevated temper tures. The eXtended Finit Element Method (XFEM)- based cohesive segment technique has been used to simulat the dyna ic crack propagation of the DWTT at all tested temperatures. The obtained numerical results were in good agreement with the observed ex erime ts. Eventually, a hybrid experimental numeric l method is proposed to define a set of critical cleavage stresses for cold/hot charged steel slabs. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: AHSS; Steel slab; Continuous casting; Cleavage fracture; Numerical modelling; DWTT; XFEM; Cohesive zone 1. Introduction During production process of Advanced High Strength Steel (AHSS) some steel slabs are subjected to undesired cleavage fracture. Brittle cracks are formed during casting process or at different process steps after continuous casting. For instance, during reheating in the hot strip mill furnace, cooling in the slab yard and transportation. These steel © 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.: +32 9 331 65 01 E-mail address: reza.hojjatitalemi@kuleuven.be * Corresponding author. Tel.: +32 9 331 65 01 E-mail ad ress: reza.hojjatitalemi@kuleuven.be

* 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.2018.12.128