PSI - Issue 13

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 Structural Integrity 13 (2018) 1088–1 92 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity Procedia 00 (2018) 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. ECF22 - Loading and Environmental effects on Structural Integrity The influence of fracture surface contact in fatigue crack propagation of material having texture under Mode II loading Taro Suemasu a *, Motomichi Koyama b , Shigeru Hamada b , Masaharu Ueda c , and Hiro hi Noguchi b a Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan b Faculty of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan c Yawata R & D Lab., Nippon Steel & Sumitomo Metal Co., 1-1 Tobihatacho Tobata-ku,Kitakyushu 804-8501, Japan In rolling contact fatigue (RCF), cyclic plastic deformation is caused by cyclic rolling contact, the texture develops, and the fatigue crack propagates in the texture under Mode II loading. As fatigue crack propagation under Mode II loading occurs inside the material, direct observation is difficult. Roughness-induced stress shielding (RISS) effect influences the fatigue crack propagation in RCF. However, as it is difficult to observe fatigue cracks in RCF directly, quantitative evaluation of RISS is difficult. Therefore, in this study, quantitative evaluation of RISS was performed by using a test method that enables direct observation of the fatigue crack propagation behavior under Mode II loading. In an actual machine in which RCF occurs, the texture has been generated. Hence, a material having texture was used for the test. From the results of the test, it was observed that the fatigue crack propagated in the same direction as the pre-crack. Therefore, fatigue crack propagation is considered to be successfully reproduced under Mode II loading. From a quantitative calculation result of the reduction rate of the stress intensity factor range owing to the contact between fracture surfaces by using the shape of the obtained fatigue crack shape and the assumed deformation shape, the reduction rate was determined to be very low. Therefore, the influence of RISS on the stress intensity factor range is considerably small, and it is considered that RISS does not exist in fatigue crack propagation under Mode II loading of a material having texture. ECF22 - Loading and Environmental effects on Structural Integrity The influence of fracture surface contact in fatigue crack propagation of material having texture under Mode II loading Taro Suemasu a *, Motomichi Koyama b , Shigeru Hamada b , Masaharu Ueda c , and Hiroshi Noguchi b a Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan b Faculty of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan c Yawata R & D Lab., Nippon Steel & Sumitomo Metal Co., 1-1 T bihatac o Tobata-ku,Kitakyushu 804-8501, Japan Abstract In rolling contact fatigue (RCF), cyclic plastic deformation is caused by cyclic rolling contact, the texture develops, and the fatigue crack propagates in the texture under Mode II l ading. As fatigue cra k propagation under Mode II loading occurs inside th m terial, direct observation is difficult. R ughness-induced stress shielding (RISS) effect influences the fatigue cra k propagation in RCF. However, as it is difficult to observe fatigue cra ks in RCF directly, quantitative evaluation of RISS is difficult. Therefore, i this study, quantitative evaluation f RISS was performed by using a test method that enables direct observation of the fatigue crack propagatio behavior under M de II loading. In an actual machin in which RCF occurs, the texture has been generated. Hence, a material having texture was used for the test. From the results of the test, it was observed that the fatigue crack propagated in the same direction as the pre-crack. Therefore, fatigue crack propagation is considered to be successfully reproduced under Mode II loading. From a quantitative calculation result of the reduction r te of the stress intensity factor rang owing to the contact between fracture surfaces by using the shape of the btained fatigue crack shape and the assumed deformation shape, the reduction rate was determined to be very low. Therefore, the influence of RISS on the str ss intensity factor range is con iderably small, and it is onsidered that RISS does not exist in fatigue crack propagation u der Mode II loading of a m terial having texture. © 2018 The Authors. Published by Els v er B.V. Peer-review under responsibility of the ECF22 organizers. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsi ility of the ECF22 organizers. Keywords: Mode II loading; Fatigue crack propagation; Roughness-induced stress shielding effect; Texture © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywo ds: Mode II loading; Fatigue crack propagation; Roughness-induced stress shielding effect; Texture Abstract

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 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 o ganizers. * Corresponding author. Tel.: +81-92-802-7677; fax: +81-92-802-0001. E-mail address: 2te17828e@s.kyushu-u.ac.jp * Corresponding author. Tel.: +81-92-802-7677; fax: +81-92-802-0001. E-mail ad ress: 2 e17828e@s.kyushu-u.ac.jp

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 ECF22 organizers. 10.1016/j.prostr.2018.12.229