PSI- Issue 9

ScienceDirect Available online at www.sciencedirect.com

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 Structu al Integrity 9 (2018) 323–328 Structural Integrity Procedia 00 (2018) 000–000 ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

IGF Workshop “Fracture and Structural Integrity”

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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Microstructure-based anisotropic fracture behavior of progressively cold drawn pearlitic steels and the subsequent crack path deflection: A Picassian Approach Jesús Toribio* Fracture & Structur l Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda Requejo 33, 49022 Zamora, Spain Abstract This paper deals with the directional toughness and anisotropic fracture behavior of progressively cold drawn pearlitic steel wires on the basis of their microstructural evolution during manufacturing by multi-step cold drawing that produces slenderizing and orientation of the pearlitic colonies, together with densification and orientation of the Fe/Fe 3 C lamellae, reviewing previous research by the author and showing: (i) the key impact of the colonies and lamellae alignment and orientation, producing anisotropic fracture behavior with its related crack path deflection; (ii) the deviation of the crack from its initial path in mode I ( anisotropic crack path ) is an increasing function of the cold drawing level; (iii) the progressively drawn steels exhibit anisotropy of fracture resistance or strength anisotropy , i.e., a sort of directional toughnes s can be defined as a function of the degree of cold drawing; (iv) in cold drawn pearlitic steels, the deflected crack is a polygonal line associated with the multi-p rspectiv cubist painting by Picasso , this paper representing thus a Picassian approac to anisotropic fracture in cold drawn pearlitic steels. . © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: eutectoi steel; pearlitic steel; cold drawing; cold drawn pearlitic steel; microstructural anisotropy; anisotropic fracture ; strength anisotropy; fracture crack pat s; crack deflection; directional fracture toughness. IGF Workshop “Fracture and Structural Integrity” Microstructure-based ani otropic fracture behavior of progressively cold drawn pearlitic steels and the subsequent crack path deflection: A Picassian Approach Jesús Toribio* Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda Requejo 33, 49022 Zamora, Spain Abstr ct This paper deals with the directional tou hn ss and anisotropic fracture behavior of progressively cold drawn pearlitic steel wire on the basis of their microstructural evolution during manufacturing by multi-step cold drawi g that produc s slenderizing a d orien ation of the pearlitic colonies, together with densification and ori ntation f the Fe/Fe 3 C la ellae, reviewing previous research by the author and showing: (i) the key impact of the coloni s and lamellae al gnment a d orientation, producing anisotropic fracture behavior with its related crack path deflection; (ii) he deviation of the crack from its initial path in mode I ( anisotrop c crack path ) is an increasing function of the cold drawing level; (iii) the progr ssively drawn steels exhibit anisotropy of fracture resistance or strength anisotropy , i.e., a sort of directional toughnes s can be defined as a function of the degr of cold drawing; (iv) in cold drawn pearlitic steels, the deflected crack is polygonal line associated with the ulti-perspective cubist inting by Picass , this paper representing t us a Pic ssian app oach to anisotropic fracture in cold drawn p arlitic steels. . © 2018 The Authors. Published by Elsevi B.V. P er-review under responsib lity of the Gruppo Italiano Frattur (IGF) ExCo. Keywords: eutectoid steel; pearlitic steel; cold drawing; cold drawn pearlitic steel; microstructural anisotropy; anisotropic fracture ; strength anisotropy; fracture crack paths; crack deflection; directional fracture toughness. © 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.: +34-980-545000; fax: +34-980-545002. E-mail address: toribio@usal.es

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 Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2018.06.003 * 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 Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. * Corresponding author. Tel.: +34-980-545000; fax: +34-980-545002. E mail address: toribio@usal.es