PSI - Issue 13

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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 Proposal of fractographic analysis method coupled with EBSD and ECCI Taketo Kaida a *, Motomichi Koyama b , Shigeru Hamada b , Hiroshi Noguchi b , Eisaku Sakurada c , Tatsuo Yokoi c a d Kohsaku Ushioda d a Graduate School of Engineering, Kyushu University,744 Moto-oka, Nishi-ku, Fukuoka-shi, Fukuoka 819-0395, Japan b Faculty of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka-shi, Fukuoka 819-0395, Japan c Nippon Steel & Sumitomo Metal Corporation, 1 Oaza-Nishinosu, Oita 870-0992, Japan d Nippon Steel & Sumikin Research Institute Corporation, Kokusai Bldg., 3-1-1 Marunouchi, Chiyoda, Tokyo 100-0005, Japan Abstract Fracture surface contains key information to analyze the crack propagation behavior and identify the causes of fracture in post mortem specimens/structural parts. For instance, fatigue crack propagation rate and the associated ∆ K can be estimated from a fractog aphic feature, i.e., the striation spacings. However, the current fractography-based methods for the estimation of fatigue crack propagation rate and ∆ K require the presence of striations. This requirement limits the capacity for the quantitative analysis of the frac ure surface. Theref r , further adva cement of fatigue fractography is required to facilitate the quantitative assessment of fracture, using post-mortem specimens/structural parts. I th s study, we pro ose fractography coupled with microstructural evolution underneath the fracture surface. Microstructural charact rization was performed, using electron backscattering diffraction (EBSD) and electron channeling contrast imaging (ECCI). In this study, we used a Fe-3Al bcc single crystalline alloy. EBSD based grain ref nce orientation deviation alysis showed iscrete plastic zones appearing along the c ack propagation direction, with spacings corresponding to the crack propagation rate. Furthermore, it was confirmed via ECCI that und rneath the fractur surface low- and high-  K regions showed vein-like and labyrinth structures, respectively. This information is expected to be us ful for microstructure-based estimation f fatigue crack propagation rate and ∆ K . © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Proposal of fractographic analysis method oupled with EBSD and ECCI Taketo Kaida a *, Motomichi Koyama b , Shigeru Hamada b , Hiroshi Noguchi b , Eisaku Sakurada c , Tatsuo Yokoi c and Kohsaku Ushioda d a Graduate School of Engineering, Kyushu University,744 Moto-oka, Nishi-ku, Fukuoka-shi, Fukuoka 819-0395, Japan b Faculty of Engineer g, Kyushu Univers ty, 744 Moto-oka, Nishi-ku, F kuoka-shi, Fukuoka 819-03 5, Japan c Nippon Steel & Sumitomo Metal Corporation, 1 Oaza Nishinosu, Oita 870-0992, Japan d Nippon Steel & Sum kin Res arch Institute Corporati n, Kokusai Bldg., 3-1-1 Marunouchi, Chiyoda, Tokyo 100-0005, Japan Abstract Fracture surface contains key information to analyze the crack propagation behavior and identify the causes of fracture in post mortem specimens/structural parts. For instance, fatigue crack propagation rate nd the associated ∆ K can be estimated from a fractographi feature, i.e., the st iation spaci gs. However, the current fractography-based methods for the estimation of atigue cr k pro agation rate and ∆ K require the presence f striations. This requirement limit the capacity for the quantitative analysis of the f acture surfac . Therefo , fu ther advancement of fatigue fractography is required to f cilitate the quantitative assessment fracture, using post-mort m specim ns/structural parts. In this study, we propose fractography coupled with microstructural evolution under eath the fracture surfac . Microstructural characterization as erf rmed, using electr n backscattering diffraction (EBSD) and lectron channeling contrast imaging (ECCI). In this study, we used a Fe-3Al bcc single crystalline alloy. EBSD based grain reference orie tation deviation an lysis showed discrete plastic zones appearing along the cra k propagation direction, with spaci gs corresp nding t the crack propagation rate. Furthermore, it was confirmed via ECCI th t underne th the fracture surface low- and high-  K re ions showed vein-like a d labyrinth structures, respectively. This information is expected to be useful for microstructure-based estimation f fatigue crack propagation rate and ∆ K . © 2018 The Authors. Published by Elsevier 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 responsibility of the ECF22 organizers. Keywords: Fractography; EBSD; ECCI; Plastic zone; Dislocation structures. Keywords: Fractography; EBSD; ECCI; Plastic zone; Dislocation structures.

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 organizers. * Corresponding author. Tel.: +81-92-802-7677; fax: 81-92-802-0001. E-mail address: 2TE18809K@s.kyushu-u.ac.jp * Corresponding author. Tel.: +81-92-802-7677; fax: 81-92-802-0001. E-mail ad ress: 2TE18809K@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.2018.12.226