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) 3483–349 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com Sci nceDirect 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 Effect of HFMI treatment procedure on weld toe geometry and fatigue properties of high strength steel welds Ebrahim Harati*, Lars-Erik Svensson, Leif Karlsson and Kjell Hurtig Department of Engineering Science, University West, SE-461 86 Trollhättan, Sweden Abstract The effects of high fr quency mechanical impact (HFMI) treatment proce ure n the weld toe geometry and fatigue strength in 1300 MPa yield strength steel welds were investigated. In this regard first the effect of three or six run treatments on the weld toe geometry was evaluated. The fatigue strength and weld toe geometry of as-welded and HFMI treated sa ples was then compared. Fatigue testing was done under fully reversed, constant amplitude bending load. When increasing the number of treatment runs from three to six, the weld toe radius and width of treatment remained almost constant. However, a slightly smaller depth of treatment in the base metal and a somewhat larger depth of treatment in the weld metal was observed. HFMI treatment increased the fatigue strength by 26%. The treatment did not increase the weld toe radius significantly, but resulted in a more uniform weld toe geometry along the weld. A depth of treatment in the base metal in the range of 0.15-0.19 mm and a width f tr atment in the range of 2.5-3 mm, were achieved. It is con l ded that the three un treatment would b a mor economical option than the six run treatment provid g a similar or even more favourable geometry modificati n. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Fatigue strength; High frequency mechanical impact treatment; High strength steel; weld toe 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Effect of HFMI treatment procedure on weld toe geometry and fatigue properties of high strength steel welds Ebrahim Harati*, Lars-Erik Svensson, Leif Karlsson and Kjell Hurtig Department of Engineering Sci nce, University West, SE-461 86 Trollhättan, Sweden Abstract Th effects of high frequ ncy mechanical impact (HFMI) treatm nt procedure on the weld toe ge met y and fatig e strength in 1300 MPa yield strength steel welds were investigated. In this regard first the eff ct of three or six run treatments on the weld to geometry was evalu ed. The fatigue strength an weld toe g ometry of as-welded and HFMI treated samples w then compar d. Fatigue testing was don under fully reversed, constant amplitude b nding load. When increasing the number of treatment runs from three t six, the weld toe radius and width of treatment remained almost constant. However, a s ightly smaller depth of treatme t in the base metal a d a somewhat larger depth of treatment in the weld metal was ob erved. HFMI treatment increased the fatigue strength by 26%. The treatme t id not increase the weld toe radiu signifi a tly, but r sulted in a more uniform el t e g ometry along t e weld. A depth of t e tment in the base metal in the range of 0.15-0.19 mm and a width of treatment i the range of 2.5-3 mm, wer achie ed. It i concluded that th three run treatm nt w uld e a more economical option than the six run treatment providing a similar or even more favourable geometry modification. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Fatigue strength; High frequency mechanical impact treatment; High strength steel; weld toe Copyright © 2016 The Authors. Published by Elsevi r B.V. This i an open access ar icle under the CC BY-NC-ND license (http://cr ativecommons.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.: +46 520 22 33 41. E-mail address: ebrahim.harati@hv.se * Corresponding author. Tel.: +46 520 22 33 41. E-mail address: ebrahim.harati@hv.se

* 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.

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.2016.06.434