PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 395–402 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Meas rement of l cal brittle fracture stress for dynamic crack propagation in steel Fuminori Yanagimoto a *, Kazuki Shibanuma a , Tomoya Kawabata a , Katsuyuki Suzuki b , Shuji Aihara a a Dept. Systems Innovation, Graduate school of Engineering, the University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan b Research into Artifacts, Center for Engineering, the University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa-shi, Chiba, Japan The authors measured the local fracture stress of brittle crack propagation in steel plates. Many studies on brittle crack propagation in steel plates have been implemented based on energy balance, but they have not been able to provide full theoretical explanation to brittle crack propagation and arrest behavior in steel plates. On the other hand, although the local fracture stress concept has been emerging as a factor governing the behavior recently, the local fracture stress has not been evaluated sufficiently because the crack front shape and forming of shear lip have prevent us from implementing accurate FEM analysis of brittle crack propagation. So, we implemented brittle crack propagation tests using specimen with side groove which is designed to increase stress near the plate surface and make the crack front straight. Inputting crack velocities obtained from experiments, FEM analyses were implemented. Our analyses showed the local fracture stress is higher in low temperature than in high temperature. This trend can be explained from the aspect of forming of tear ridge, which is main mechanism to absorb energy during brittle crack propagation in steel plates. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientifi Committee of ECF21. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Measurement of local brittle fracture stress for dynamic crack propagation in steel Fuminori Yanagimoto a *, Kazuki Shibanuma a , Tomoya Kawabata a , Katsuyuki Suzuki b , Shuji Aihara a a Dept. Systems Innovation, Graduate school of Engineering, the University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan b Research into Artifacts, Center for Engineering, the University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa-shi, Chiba, Japan Abstract The authors measured the local fracture stress of brittle crack propagation in steel plates. Many studies on brittle crack propagation in steel plates h ve been implemented based on energy balance, but they have not been able to provide full theoreti al expl n to brittle crack propagation and arr st behavior i steel pl tes. On other hand, although the local rac ure stress concept has been emerging as a f ctor governing the behavior rec ntly, the local fractur stress h s n t been evaluated s fficiently because the crack front shape nd forming of shear lip have prevent us from implementing accurate FEM analysis of brittle crack propagation. So, we implemented brittle crack propagation tests using specimen with side groove which is designed to increase stress near the plate surface and make the crack front straight. Inputting crack veloc ti s obtained from experiments, FEM analyses wer implemented. Our analyses showed the local fracture stress is higher in low temperature than in high temperature. This tr nd can be explai ed from the aspect of forming f tea ridge, which is main mechanis to bsorb energy during brittle crack propagatio in steel plates. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: Type your keywords here, separated by semicolons ; 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. 1. Int oductio Recently, steel plates used for naval structures have become thicker and thicker for considering their swelling. This Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. 1. Introduction Recently, steel plates used for naval structures have become thicker and thicker for considering their swelling. This Abstract Keywords: Type your keywords here, separated by semicolons ;

* Corresponding author. Tel.:+81-3-5841-6554. E-mail address: yanagimoto@struct.t.u-tokyo.ac.jp * Corresponding author. Tel.:+81-3-5841-6554. E-mail address: yanagimoto@struct.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 responsibility 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.2016.06.051