PSI - Issue 2_B

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ScienceDirect

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 1601–16 9 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 WES 2808 for brittle fracture assessment of steel components under seismic conditions Part III: Change in CTOD fracture toughness of structural steels by pre-str in and dynamic loading Satoshi Igi a , Yusuke Shimada b , Masao Kinefuchi c , Fumiyoshi Minami d a JFE Steel Corporation, 1 Kawasaki, Chuo, Chiba 260-0835, Japan b Nippon Steel & Sumitomo Metal Corporation, 1-8 Fuso-cho, Amagasaki, Hyougo 660-0891, Japan c Kobe Steel, Ltd., 1-5-5 Takatsukadai, Nishi-ku, Kobe 651-2271, Japan d Joining and Welding Research Institute, Osaka Universi y, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan It has been reported that dynamic and cyclic large deformation the main factor, and as for the brittle fracture of the weld steel structure at the Hanshin-Awaji earthquake in 1995. As for this issue, fracture toughness deteriorates by the change in tensile properties of the steel materials by the dynamic and/or cyclic strain, and it is thought that fracture was initiated from weld defects. Fracture toughness change due to dynamic and/or cyclic strain was quantified at FTE Committee in Japan welding engineer society (JWES), and the result is taken in an assessment procedure standard of WES2808(2003). Thereafter, the FTE committee examined the expansion of pplication steel m terials continuously an was able t adapt HT780 as a target range in this standard revision. In this report, a temperature shift concept that is t e basic of the fracture toughness evaluation of WES2808 is described the influ nce o the dynamic lo ding and pre-str in. And it is included the comparison of strain-hi tory effect such as monotonic vs. cyclic strain and tensile vs. compressive strain. In addition, it is exami e the influence of the dynamic and pre-strain history on fracture to ghness chang for HT780 and confirmed t at a temperature shift equations in WES2808 (2003) can be applicable to HT780 ste l. 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. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Brittle fracture; Pre-strain; Dynamic loading; Temperature shift Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract

* Corresponding author. Tel.: +81-43-262-2420; fax: +81-43-262-2117. E-mail address: s-igi@jfe-steel.co.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 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.2016.06.203