PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable online at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3668–3675 Sci nceDirect Structural Integrity Procedia 00 (2016) 000–000 ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com

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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 Micro-pr c sses of brittle fracture initiation in bainite steel manufactured by ausforming Shohei Asako* a , Tomoya Kawabata a , Shuji Aihara a , Shintaro Kimura b and Kiyoshi Kagehira c a The University of Tokyo, Hongo7-3-1, Bunkyo, Tokyo 113-8656, Japan; b Mitsubishi Heavy Industries, Kanonshinmachi 4-6-22,Hiroshima 733-8553, Japan ; c Primetals Technologies Japan, Kanonshinmachi 4-6-22, Hiroshima 733-8553,Japan Abstract In recent years, the high tensile steels have got much attention in steel structural fields. Especially, the steel plate which has bainitic structure manufactured by TMCP (thermo-mechanical control process) technology becomes widely used because it has good balance of strength, ductility and toughness. Microstructure of those material is basically bainite structures, which are consisted of bainitic ferrite, cementite and MA (Martensite-Austenite constituent). Furthermore bainite microstructure manufactured by modern TMCP has extremely fine structures due to its transformation process from heavily deformed band structure including sub-grain structures which were generated during large amount of rolling in unrecrystallized temperature range called “ausforming”. However, the theoretical mechanism of brittle fracture initiation of bainite is still not clear because of its c mplexity of its structure. According to previous research including the observation of the fracture surfaces or cross sections of fractured speci ens, the prior phenomenon of brittle fracture may occur at either the boundary area between MA and matrix or inside of MA. However, the details of the prior event for the macroscopic fracture mechanism are still unknown. The purpose of this study is to clarify the precursor phenomenon and estimate the quantitative criterion of brittle fracture initiation of bainite steels, which have fine microstructures, by observing the process of it directly by the in-situ observation ethods. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Micro-processes of brittle fracture initiation in bainite steel manufactured by ausforming Shohei Asako* a , Tomoya Kawabata a , Shuji Aihara a , Shintaro Kimura b and Kiyoshi Kagehira c a The University of Tokyo, Hongo7-3-1, Bunkyo, Tokyo 113-8656, Japan; b Mitsubishi Heavy Industries, K n shinmachi 4-6-22,Hiroshima 733-8553, Japan ; c Primetals Technologies Japan, Kanonshi machi 4-6-22, Hiroshima 733-8553,Japan Abstract In rec nt years, the high tensile steels hav got much attention in steel structural fields. Especially, the steel plate which has bainitic structure manufac ured by TMCP (thermo-mechanical co trol process) techno ogy becomes wid ly used because it good balance of stre gth, ductility and toughness. Microstructure f th s mat rial is basically bainit str ctures, which are c nsisted of bainitic ferrite, ceme tite and MA (Martensite-Austenite constituent). Furthermore bainite microstructu manufactured y modern TMCP has extremely fine structures due to its transformation process fr m he vily defo med band structure including sub-grain structures which wer generated ring large am unt of rolling in unrecrysta lized te perature range called “ausformin ”. However, the the et cal mechanism of brittle fracture initiation of bainite is still not clear because of its complexity of its structur . According to previous research including the observation of he fracture surfaces or cross secti ns of fracture pecimens, the pr or phenomenon of brittle fract re may occur at e ther the boundary are between MA and matrix or inside of MA. However, the details f the prior event or th macroscopic frac ure m chanism are still unknown. The purpose of thi study is to clarify the precursor phenomenon and estimate the quant tative criterion of brittle fracture initiation of bainite steels, which have fine microst u tures, by observing the process f it direc ly by the in-situ bservation methods. © 2016 The Authors. Published by Elsevi r B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access arti le under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-n -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: TMCP, Toughness, MA, brittle crack, initiation, in-situ observation Keywords: TMCP, Toughness, MA, brittle crack, initiation, in-situ observation

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 un r 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.: +81-3-5841-6503; fax: +81-3-5841-6503. E-mail address: asako@fract.t.u-tokyo.ac.jp * Corresponding author. Tel.: +81-3-5841-6503; fax: +81-3-5841-6503. E-mail address: asako@fract.t.u-tokyo.ac.jp

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.2016.06.456