PSI - Issue 3

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 3 (2017) 57–67 Available online at www.sciencedirect.com Scie rect Structural Integrity Procedia 00 (2017) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. Copyright © 2017 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 IGF Ex-Co. XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy On the role of microstruct al properties on mechanical behavior of API-X46 steel M.A. Beltrán a* , J.L. González b , D. Rivas b , F. Hernández c , H. Dorantes b a PhD student of the Metallurgy and Materials Department, ESIQIE IPN, México, D.F. b Professor of the Metallurgy and Materials Department, ESIQIE IPN, México, D.F. c Professor of Posgraduate Studies and Research Section,, ESIME IPN, México, D.F. Abstract The dependence of the mechanical properties respect to the microstructural orientation of a low carbon steel API-5L grade X46 pipe was assessed by Charpy impact and tensile strength tests, through the use of samples oriented in the longitudinal (L) and circumferential (C) directions. Also, a thorough microstructural and EBSD analysis were made. The steel presented anisotropic mechanical behavior, associated with the material forming process. The specimens oriented in the L direction, which is parallel to the microstructural banding, had a lower fracture resistance (K IC-CV ) and tensile properties (YS) than the C oriented specimens. Acco ding to obtained results, it is con luded that the influence of microstructural ba ding and crystallographic tex ure varies the fracture toug ness of a mat rial at least 10% between the L and the C directions. Hence, the an sot opy co fficient “r rv ” was introduced to c rrelate quantitatively the micro truc ural properties o the anisotropic beha ior of the API-5L X46 steel. The fracture r sistance and tensile strength are mainly influ nce by crystall gr phic texture, while the tensile ductility is associated o the microstructural banding © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. Keywords: Mechanical anisotropy; API steel; fracture resistance. 1. Introduction The traditional criteria of fracture analysis idealize the mechanical properties of the metallic materials, considering them homogeneous, linear, isotropic and free of defects. Idealization is compensated by the use of safety factors, which are often raised according to the criteria of the designer, so working under these assumptions is risky and the XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy On the role of microstructural properties on mechanical behavior of API-X46 steel M.A. Beltrán a* , J.L. G nzález b , D. Rivas b , F. Hernández c , H. Dorantes b a PhD student of the Meta lurgy and Materials Department, ESIQIE IPN, México, D.F. b Professor of the Metallurgy and Materials Department, ESIQIE IPN, México, D.F. c Professor of Posgraduate Studies and Research Section,, ESIME IPN, México, D.F. Abstract The dependence of the mechanical properties respect to the microstructural orientation of a low carbon steel API-5L grade X46 pipe was assessed by Charpy impact and tensile strength tests, through the use of samples riented i th ongitudinal (L) and c rcumferential (C) directions. Also, a thorough micros ructural and EBSD analysis were made. The steel presente anisotropic me hanical behavior, associated with the material forming process. The specimens orient d in the L direction, which is parallel to th microstructural banding, had a lower fr cture resistance (K IC-CV ) and tensile prop r ies (YS) than the C oriented s ecim ns. According to obt ined results, it is c ncluded hat the influence of microstructural banding and cryst llographic texture var es the fra ture toughness of a material at least 10% betw e th L and the C directions. He ce, the anisotropy coefficient “r rv ” was introduced to correlate quanti atively the micros ruct ral propertie to the anisotropic behavior of th API-5L X46 ste l. The fractu e resistance and tensile strength ar ainly influenced by crystallographic texture, whil the t nsile ductility is ssociated to the mi ostructural bandi g © 2017 The Author . Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of IGF Ex-Co. Keywords: Mechanical anisotropy; API steel; fracture resistance. 1. Introduction The traditional criteria of fracture analysis idealize the mechanical properties of the metallic materials, considering them homogeneous, line r, isotropic and free of defects. Idealization is compensat d by the use of safety factors, which are ft rai ed according to the criteria f the de ign r, so working und r th se assumptions i risk and the © 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 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. * Corresponding author. Tel.: +52-55-57296000 ext.54264; fax: 54267. E-mail address: mabz_2205 @ hotmail.com * Corresponding author. Tel.: +52-55-57296000 ext.54264; fax: 54267. E-mail address: mabz_2205 @ hotmail.com

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2017 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 IGF Ex-Co. 10.1016/j.prostr.2017.04.009