PSI - Issue 2_A

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 Struc ural Integrity 2 (2016) 1643–1651 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 Application of Coupled Damage and Beremin Model to Ductile Brittle Transition Temperature Region Considering Constraint Effect Kiminobu Hojo a *, Naoki Ogawa b , Takatoshi Hirota b , Kentaro Yoshimoto b , Yasuto Nagoshi a , and Shinichi Kawabata c a Mitsubishi Heavy Industries, Ltd., 1-1, 1-chome, Hyogo-ku, Kobe, 652-8585 Japan b Mitsubishi Heavy Industries, Ltd., 1-1, 2-chome, Shinhama, Arai-cho, Takasago, 676-8686 Japan c Ryoyu System Engineering Co., Ltd., 1-6, 5-chome Komatu-dori, Hyogo-ku, Kobe, 652-0865 Japan For nuclear safety, fracture evaluation of reactor pressure vessels (RPV) under neutron irradiation is key issue. Fracture toughness from a CT speci en is used s a material consta t for fracture valuation, but it is well known that it has a large constraint, which causes lower toughness than that of flawed structures, such as a RPV with a surface flaw. In ductile to brittle transition temperature (DBTT) region ferritic steel which is material of RPV has a large scatter and it becomes important to know the accurate scatter of an irradiated material because of less margin of RPV's integrity after a long term operation. In this paper to establish a more precise fracture evaluation method in DBTT region for an irradiated RPV with a postulated surface flaw, a coupled model of damage mechanics for ductile fracture and Beremin model for cleavage fracture was applied for correction of the effect of a small ductile growth on the stress-strain field. To confirm the validity of the method, as the first trial, fracture tests using CT specimens were performed in several temperature conditions. The temperature dependence of the parameters of Beremin models were investigated as well. © 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 Application of Coupled Damage and Beremin Model to Ductile Brittle Transition Temperature Region Considering Constraint Ef ect Kiminobu Hojo a *, Naoki Ogawa b , Takatoshi Hirota b , Kentaro Yoshimoto b , Yasuto Nagoshi a , and Shinichi Kawabata c a Mitsubishi Heavy Industries, Ltd., 1-1, 1-chome, Hyogo-ku, Kobe, 652-8585 Japan b Mitsubishi Heavy Industries, Ltd., 1-1, 2-chome, Shinhama, Arai-cho, Takasago, 676-8686 Japan c Ryoyu System Engineering Co., Ltd., 1-6, 5-chome Komatu-dori, Hyogo-ku, Kobe, 652-0865 Japan Abstract For nuclear safety, fracture evaluation of reactor pressure vessels (RPV) under neutron irradiation is key issue. Fracture toughness from a CT specim n is used as a ma e ial constant for fracture evaluatio , but it is well known that it has a larg c nst aint, which causes lower toughness th that of flawed structu es, su h as a RPV w th a surface fla . In ductile to br tl tra itio temperature (DBTT) region ferri ic steel which is material of RPV as a large scatt r and it b comes important to know he accur te scatter f an irradiated mat ial because of les rgin of RPV's integrity after a long term operation. In his paper to establish a more precise f ctur evaluation method in DBTT region for an irradiated RPV with a p stulated surface flaw, a coupled model of damage mechanics for ductil fracture and Beremi model fo cleavage fracture was app ied for correction of the effect of a small ductile growth on the stress-strain field. To conf rm the validity of th method, as the first trial, fracture tests using CT specimens wer performed in several temp rature ditions. The temperature dependence of the pa meters of Beremin models were investigated as well. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: ductile to brittle trainsition tenperature (DBTT); Beremin model; damage mechanics, Gurson model; Rousselier model; CT specimen; Weibull stress 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: ductile to brittle trainsition tenperature (DBTT); Beremin model; damage mechanics, Gurson model; Rousselier model; CT specimen; Weibull stress Abstract

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review und r 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. * Corresponding author. Tel.: +81-78-672-2249; fax: +81-78-685-2399. E-mail address: kiminobu_hojo@mhi.co.jp * Corresponding author. Tel.: +81-78-672-2249; fax: +81-78-685-2399. E-mail address: kiminobu_hojo@mhi.co.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.2016.06.208