PSI - Issue 2_A

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 1738–1745 Available online at www.sciencedirect.com Sci nceDirect 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 Fatigue properties of high-strength steel in diesel oil S. Kagami a, *, A. Ueno b , S. Miyakawa a , N. Miyamoto a , N. Ishibashi c , B. Guennec b a Materials Engineering R&D Division, DENSO CORPORATION, 1-1 Showa-cho, Kariya, Aichi 448-8661, Japan b Department of Mechanical Engineering, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan c Graduate School of Mechanical Engineering, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan Abstract This paper describes the fatigue properties of chromium-molybdenum steel in air and diesel oil. 4-point bending fatigue tests were conducted at a stress ratio of R =0.05. The corrosion mark was not confirmed on the specimens tested in diesel oil, and the fatigue strength at N f < 3 × 10 4 improved and that at N f > 3 × 10 4 declined compared to in air. The fatigue crack initiation life accounted for about 90 % of the fatigue life N f . The results of the elemental analysis of the specimen surface tested in diesel oil which were broken at N f > 3×10 4 , O, Si, and C had been concentrated. The reduction of fatigue strength at N f > 3×10 4 is considered to be caused by some influence of deterioration of the diesel oil winhich progress with the fatigue test. On the other hand, the fatigue test at N f < 3×10 4 is usually finished withi one day, so diesel oil does not have the time to det riorate. Then, a few fatigue tests were conducted in the deteriorated diesel oil at a relatively high stres range, in order to break the specimen at N f < 3×10 4 . As a result, fatigue life tends to shorten. Therefore, it was found that the diesel oil deterioration should be considered as one of the important factors to explain the decrease of fatigue strength. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Fatigue strength, Effect of fuel, Diesel oil, High-strength steel 1. Introduction The use of automobiles expands with the developments in car technology in all over the world. In addition, the number of diesel car in Europe is incr asing year by year. The diesel car has been advanced high pressure of fuel for the purpose of exhaust gas reduction and thermal efficiency improvement. So stress applied to the product tends to 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Fatigue properties of high-strength steel in diesel oil S. Kagami a, *, A. Ueno b , S. Miyakawa a , N. Miyamoto a , N. Ishibashi c , B. Guennec b a Materials Engineering R&D Division, DENSO CORPORATION, 1-1 Showa-cho, Kariya, Aichi 448-8661, Japan b Department of Mechanical Engineering, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan c Graduate Scho l of Mechanical Engineering, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 25-8577, J pan Abstract This paper describes the fatigue properties of chromium-molybdenum steel in air and diesel oil. 4-point bending fatigue tests were conducted at a tress r tio of R =0.05. The orros on ark was not confirmed on the specimens tested in diesel oil, and the fatigue strength N f < 3 × 10 4 improved and that at N f > 3 × 10 4 declined co pared to in air. The fatigue crack initiation lif acco nted for about 90 % of the fatigue life N f . The results of the el me tal analysis of the specim n surface tested in diesel oil which were broken at N f > 3×10 4 , O, Si, and C had been concentrated. The reduction of fatigue trength at N f > 3×10 4 is conside ed to be caused by some influence of eterioration of the diesel oil winhich pr gress with the fati ue test. On the other ha d, th fatigu test at N f < 3×10 4 is usually finished w thin one day, so diesel oil does not have the time to det riorate. Then, a few fa igue sts w e c ducte i the deteriorated diesel il at a relatively high stress ra ge, in order to break th specime at N f < 3×10 4 . As a result, fatigue life tends to shorten. Therefore, it was found that t e die el oil terioration should be considered as one of the important factors to explain he decr ase of fatigue strength. © 2016 The Authors. Published by Elsevier B.V. Peer-review under respons bility of the Scientific Committee of ECF21. Keywords: Fatigue strength, Effect of fuel, Diesel oil, High-strength steel 1. Introduction The use of automobiles expands with the developm nts in car technology in all over the world. In addition, the numb r of diesel car in Europe is increasing year by year. The dies l car has been advanced high pressure of fuel for the purp se of xh st gas r duct on and thermal efficiency improvement. So stress pplied to the product tends to Copyright © 2016 The Auth rs. Published by Elsevier B.V. This is an open access articl u der 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.

* 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 ECF21. * Corresponding author. Tel.:+81-566-25-7776; fax:+81-566-25-4619. E-mail address:SYU_KAGAMI@denso.co.jp * Corresponding author. Tel.:+81-566-25-7776; fax:+81-566-25-4619. E-mail address:SYU_KAGAMI@denso.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.2016.06.219