PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable online at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 2389–2396 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 M ltiscal modeling to clarify the relationship between microstructures of steel and macroscopic brittle crack propagation/arrest behavior Yuki Yamamoto a *, Kazuki Shibanuma a , Fuminori Yanagimoto a , Katsuyuki Suzuki b , Shuji Aihara a , Hiroyuki Shirahata c a Dept. Systems Innovation, Graduate School of Engineering, The Univercity of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan b Reserch into Artifacts, Center for Engineering, The Univercity of Tokyo, 5-1-5, Kashiwanoha, Kashiwa-shi, Chiba, Japan c Oita R&D Lab, Nippon Steel & Sumitomo Metal Corporation, 1, Oaza-Nishinosu, Oita, Japan Prevention of brittle cra ck propagation as well as crack initiation is essential as “double integrity”. The application of steels with high arrestability to the structures is directly effective to ensure the integrity. Although it is empirically known microstructures have a possibility to macroscopically enhance the arrestability of steel, there are not any theories which have quantitatively explained the relationship between brittle fracture and microstructures in the past investigations. In the present study, we propose a multiscale fracture mechanics model by a “model synthesis” approach, which integrates the multiple models and analyses to systematically evaluate complicated macroscopic and microscopic phenomena, based on the information of microstructures of the steel. The model is composed of (i) microscopic model to simulate cleavage fracture in grain scale ( 10 −6 ~10 −3 m), and (ii) macroscopic model to simulate brittle fracture in steel plate scale ( 10 −3 ~10 0 m). As validation, the proposed model is applied to temperature gradient crack arrest test of steel plate having nonhomogeneous distributions of microstructures in thickness direction. The prediction results show good agreement with experimental results in both crack arrest length and shape of crack front. That is, the proposed model has a potential basis of the framework to establish the theory to clarify the relationship between microstructures and brittle crack propagation and arrest behavior. © 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 Multiscale modeling to clarify the relationship between microstructures of steel and macroscopic brittle crack propagation/arrest behavior Yuki Yamamoto a *, Kazuki Shibanuma a , Fuminori Yanagimoto a , Katsuyuki Suzuki b , Shuji Aihara a , Hiroyuki Shirahata c a Dept. Systems Innovation, Graduate School of Engineering, The Univercity of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan b Reserch into Artifacts, Center for Engineering, The Univercity of Tokyo, 5-1-5, Kashiwanoha, Kashiwa-shi, Chiba, Japan c Oita R&D Lab, Nippo Ste l & Sumitomo Metal Corporation, 1, Oaza-Nishinosu, Oita, Japan Abstract Preven ion of brittle cra ck propagation as well as crack initiation is essential as “double integrity”. The application of steels with high arrestability o the structures is directly effe tive to ensure the integrity. Although it is empirically known microstructures ave possib lity to mac oscopically enhance the arrestability of steel, there are ot any theories which have quan itatively explained the relationship between brittle fracture and microstructure in the past investig tions. In the present study, w propose a multiscale f acture mechanics model by “model synthesis” approach, which i t grates the multiple models and analyses to systematically evaluate omplicated macroscopic and micro copic phenomena, bas d on the information f microstructur of the steel. The model is om osed of (i) microscopic model to simulate cleavage fracture in grain scale ( 10 −6 ~10 −3 m), and (ii) macroscopic model to simulate brittle fractu e in steel plate scale ( 10 −3 ~10 0 m). As validation, the proposed model is applied to temperature gra ient crack arrest t st of steel plate having nonhomogeneous distributions of micr tructures n thickness direction. The prediction results how g od agreement with experimental result in both crack arrest length and shape of crack front. That is, th proposed model has a potential basis of the framewo k to establish the theory to clarify the relationship between micros ructures an brittl crack propagation nd arrest beh vior. © 2016 The Au hors. Published by Elsevie B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: brittle fracture; multisacle model; model synthesis; Monte Carlo simulation; cleavage fracture; crack propagation; crack arrest; 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. Keywords: brittle fracture; multisacle model; model synthesis; Monte Carlo simulation; cleavage fracture; crack propagation; crack arrest; Abstract

* Corresponding author. Tel.: +81-3-5841-1864. E-mail address: y_yamamoto@save.sys.t.u-tokyo.ac.jp * Corresponding author. Tel.: +81-3-5841-1864. E-mail address: y_yamamoto@save.sys.t.u-tokyo.ac.jp

* 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.

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.2016.06.299