PSI - Issue 2_B

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ScienceDirect Available online at www.sciencedirect.com Available online at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 847–854 Structural Integrity Procedia 00 (2016) 000–000 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. Copyright © 2016 The Authors. Published by Elsevier B.V. This is a open ac ess ar icle under the CC BY-NC-ND license (http://creativec mmons.org/licenses/by-nc-nd/4.0/). Peer-review und r responsibility of the Scientific Committee of ECF21. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy The influence of plastic material property equations on the initial C ( t ) and J ( t ) in elastic-plastic cre p FE analysis So-Dam Lee a , Han-Sang Lee a , Myeong-Woo Lee a , Yun-Jae Kim a *, Robert A Ainsworth b , David W Dean c a Korea University, 5Ka Anam-Dong, Sungbuk-Gu, Seoul 136-701, Republic of Korea b The University of Mancherste, Manchester M13 9PL, UK c Assessment Technology Group, EDF Energy, Barnwood Gloucester GL4 3RS, UK Abstract In this paper, the influence of plastic material property equations on the initial C ( t ) and J ( t ) is investigated by using elastic-plastic creep FE analysis. For plastic models, three equations with different values around 0.2% yield strength are considered for study. These models are found to have an effect on calculated C ( t ) values for a short time or redistribution time. In case of J ( t ), the rate of its change is not affected by the models, whereas J (0) values were affected. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: C(t) integral; J(t) integral; Elastic-plastic-creep FE analysis 1. Int oduction In case of fracture mechanics analysis of a cracked component at high temperature, calculation of time-dependent C ( t ) and J ( t ) is significant (R5, 2015; Riedel, 1987). C ( t ) can be used to explain the singular stress at the crack tip (Riedel, 1987; Webster et al., 1994) to evaluate creep crack growth rates. At steady state, when time goes to infinity, 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy The influence of plastic material property equations on the initial C ( t ) and J ( t ) in elastic-plastic-creep FE analysis So-Dam Lee a , Han-Sang Lee a , Myeong-Woo Lee a , Yun-Jae Kim a *, Robert A Ainsworth b , David W Dea c a Korea University, 5Ka Anam-Dong, Sungbuk-Gu, S oul 136-701, Republic of Korea b he University of Mancherste, Manchester M13 9PL, UK c Assessment Technology Group, EDF Energy, Barnwood Gloucester GL4 3RS, UK Abstract In this p per, the influence of plastic mat rial property equations o the initi l C ( t ) and J ( t ) s investi ated by using lastic-plastic cre p FE analysis. For plastic models, three equations with differ nt values around 0.2% yield stre gth are con idered for study. The e models are found to have an effect on calculated C ( t ) valu s for a short time or redistribution time. In case of J ( t ), the rate of its change is not affected by the models, whereas J (0) values were affected. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: C(t) integral; J(t) integral; Elastic-plastic-creep FE analysis 1. Introduction In case of fracture mechanics analysis of a cracked compo ent at high t mperatur , calc lation of time-dependent C ( t ) and J ( t ) is significant (R5, 2015; Riedel, 1987). C ( t ) can be used to explain the singular stress at the crack ip (Riedel, 1987; Webster et al., 1994) to evaluate creep crack growth rates. At steady state, when time goes to infinity, © 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.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2016 Th 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 ECF21. * Correspon ing author. Tel.: +82-2-3290-3372; fax: +82-2-929-1718. E-mail address: kimy0308@korea.ac.kr * Corresponding author. Tel.: +82-2-3290-3372; fax: +82-2-929-1718. E-mail address: kimy0308@korea.ac.kr

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.2016.06.109