PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 279–285 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Formulation of CTOD design curve considering the yield to tensile ratio Yoichi Kayamori a, *, Tomoya Kawabata b , Yukito Hagihara c a Steel Research Laboratories, Nippon Steel & Sumitomo Metal Corporation,1-8 Fuso-cho, Amagasaki, Hyogo, 660-0891 Japan b Department of Systems Innovation, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-8656 Japan c Formerly, Department of Mechanical Engineering, Sophia University, 7-1 Kioicho, Chiyoda-ku, Tokyo, 102-8554 Japan Abstract The Crack Tip Opening Displacement (CTOD) design curve approach is one of the fracture assessment procedures for estimating CTOD as an elastic-plastic fracture driving force, and is used for the assessment of flaws in welded structures. The Japan Welding Engineering Society (JWES) has produced a semi-empirical CTOD design curve, where CTOD is calculated from the local strain acting on the assumed crack, the crack size and the yield strain of the material. CTOD should be estimated by using all the factors influencing the crack driving force in the welded joint, but the yield to tensile ratio, Y/T , which relates to strain hardening behavior, is not used for the CTOD design curve. On the other hand, the new CTOD calculation formula adopted by the JWES CTOD fracture toughness testing standard uses Y/T , and derived CTOD values from the formula are affected by Y/T . Consequently, there is a mismatch in CTOD calculation between the fracture driving force of welded structures and the fracture toughness of standard specimens. In this study, Y/ was considered for formulating a new CTOD design curve. CTOD estimated by the new design curve was compared wi CTOD obtained by the finite el ment analys s of a orner boxing fill t welded joint. Th n w CTOD design curve contributes to a good CTOD estimation for different Y/T welded join models. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Formulation of CTOD design curve considering the yield to tensile ratio Yoichi Kayamori a, *, Tomoya Kawabata b , Yukito Hagihara c a Steel Research Laboratories, Nippon S eel & Sumitomo Metal Corporation,1-8 Fuso-cho, Amagasaki, Hyogo, 60-0891 Japan b Department of Systems Innovation, The University of Tokyo, 7-3-1 Hong Bunkyo-ku, Tokyo, 113-8656 Japan c Formerly, Department of Mechanical Engineering, Sophia University, 7-1 Kioicho, Chiyoda-ku, Tokyo, 102-8554 Japan Abstract The Crack Tip Opening Disp cement (CTOD) d sign curve approach is one of t fracture assessment procedur s for estimating CTOD as an elastic-plastic fractur driving force, and is used for the assessment of flaws in welded structures. The J pan Welding Engineering Society (JWES) has produced a semi-empirical CTOD esign curve, where CTOD is calc ated from th local strain ac ing on the ass med crack, the rack size and the yield strain of the material. CTOD should be estimated by using all the facto s i fluencing the crack driving force in the welded joint, but yield to tensile ratio, Y/ , whi h relates to strain hardening behavior, is not used for the CTOD design curve. On the other hand, the new CTOD calculation formula adopted by the JWES CTOD fracture toughness testing standard uses Y/T , a d deriv d CTOD values from the formula ar affected by Y/T . Consequently, ther i a mismatch in CTOD calculation between the fracture riving force of welded structur s and the fracture toughness of standard specime s. In this study, Y/T was considered for formulati g a new CTOD design urve. CTOD estima ed by the new design curve was compared with CTOD obtained by the fi ite eleme t analysis of a corn r boxing fillet weld d joint. The new C OD design curve contributes to a good CTOD estimation for different Y/T welded join model . © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: CTOD ; Design curve ; Welded joint ; Yield to tensile ratio ; Finite element analysis Keywords: CTOD ; Design curve ; Welded joint ; Yield to tensile ratio ; Finite element analysis

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.133 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Correspon ing author. Tel.: +81-6-7670-8745; fax: +81-6-6489-5794. E-mail address: kayamori.k9k.yoichi@jp.nssmc.com * Corresponding author. Tel.: +81-6-7670-8745; fax: +81-6-6489-5794. E-mail address: kayamori.k9k.yoichi@jp.nssmc.com