PSI - Issue 2_A

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 Structu al Integrity 2 (2016) 825–831 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect 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 Finite eleme t simulation of creep crack growth using combined plastic-creep damage model Dong-Jun Kim a , Kyung-Dong Bae a , Han-Sang Lee a , Yun-Jae Kim a * and Goon-Cherl Park b a Department of Mechanical Engineering, Korea University, Anam-ro, Seongbuk-gu Seoul 02841, Korea b Department of Nuclear Engineering, Seoul National University, Gwanak-ro, Gwanak-gu Seoul 08826, Korea Abstract This paper compares a combined plastic and creep damage model with only creep damage model by simulating creep crack growth of P91. The previous model considered only creep damage is extended to consider effect of plastic damage to creep crack growth. The damage model is based on the stress-modified fracture strain model using the ductility exhaustion concept. Also, creep fracture strain depending on the strain rate is considered. Total damage is defined simply through linear addition of plastic and creep damage. When the accumulated damage becomes unity, all stress components at the finite element gauss point are reduced to a small value to simulate failure. Finite element damage analysis results using previous and proposed model are compared with experimental data for P91. The proposed model gives a better agreement with the experimental data compared with the previous model. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Plastic-creep damage model;Creep crack growth;finite element analysis; P91 1. Introduction Predicting creep crack growth is important for plant components with defects at high temperature. Creep crack growth tests are in general expensive and time-consuming. For these reasons, an efficient tool may be needed to minimize the need to perform the tests. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Finite element simulation of creep crack growth using combined plastic-creep damage model Dong-Jun Kim a , Kyung-Dong Bae a , Han-Sang Lee a , Yun-Jae Kim a * and Goon-Cherl Park b a Department of Mechanical Engineering, Korea University, Anam-ro, Seongbuk-gu Seoul 02841, Korea b Department of Nuclear Engineering, Seoul National University, Gwanak-ro, Gwanak-gu Seoul 08826, Korea Abstract This paper compares a combined plastic and creep damage m del with only creep damage model by simulating creep crack growth of P91. The previ us model considered only creep damage is extended to consi er eff ct f p astic dam ge to r . The damage model is based on the stress-modified fr cture strain model u ing the ductility exhaustion c n pt. Also, c eep fracture strain depending on the strain rat i consid red. Total damage is defined simply through linear addition of plastic and creep damage. When the accumulated d mage becomes unity, all stress components at the finite element gauss point are redu ed to small value o simulate failure. Finite le ent damage analysis results using pr vious and proposed model compared with experimental data for P91. The proposed model gives better agreement with the experimental data compared with the previous model. © 2016 Th Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: Plastic-creep damage model;Creep crack growth;finite element analysis; P91 1. Introduction Predicting creep crack growth is important f r plant components with defects at high temperature. Creep crack growth tests are in general expensive and time-consuming. F r these reasons, an eff cient tool may be n eded to minimiz the need to perform th tests. 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-n /4.0/). Peer-revi w und r 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.

* 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 r sponsibility of the Scientific Committee of ECF21. * Corresponding 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.2016.06.106