PSI - Issue 2_B

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) 3554–3561 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 il l li t . i i t. t t l t it i

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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 Variable amplitude fatigue tests at high frequency hammer peened welded ultra high strength steel S1100 Joern Berg a *, Natalie Stranghoener a , Andreas Kern b , Marion Hoevel b a University of Duisburg-Essen, Institute for Metal and Lightweight Structures, 45141 Essen, Germany b ThyssenKrupp Steel Europe AG, Heavy Plate Unit, Quality Affairs / Research and Development, 47259 Duisburg, Germany Abstract Post weld treatment methods such as high frequency hammer peening (HFHP) increase the fatigue strength of welded details mainly due to modifying the residual stress state and extending the period of crack initiation. Recently performed fatigue tests at steel grades S960, S1100 and S1300 with constant amplitude loading showed a large increase of fatigue life due to the application of HFHP. However, the influence of spectrum type loading including pre- and overloads at HFHP treated notch detail h s to be considered as well. For this reason, fatigue tests with operational-like variable amplitude loading at welded notch details of transversal stiffener and butt weld of S1100 with untreated and HFHP treated weld toe condition have been performed showing an increas of fatigue life due to HFHP tr atment ev for maximum stresses lose to or above the yield stre th. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th Scientific Committee of ECF21. Keywords: high frequency hammer peening; post weld treatment; ultra high strength steels; fatigue life improvement; variable amplitude loading. 1. Introduction Ultra high strength fine grained structural steels (UHSS) with yield strength up to 1300 MPa are applied in mobile cran structures for the purpose weight reduction (K rn et al. (2002a, 2002b)). Due to applied fatigue loads during operation the lifetime of welded notch details of these structures is limited. By the application of post weld treatment methods the fatigue strength of welded details can be improved. In particular, methods like high frequency hammer a i it f i , tit t f t l i t i t t t , , b t l , l t it, lit ff i / l t, i , Abstract t l t t t t i i i t ti t t l t ils i l t i i t i l t t t t i t i i iti ti . tl ti t t t t l , it t t lit l i l i ti li t t li ti . , t i l t t l i i l i l t t t t t il t i ll. t i , ti t t it ti l li i l lit l i t l t t il t l ti tt l it t t t t l t iti i i ti li t t t t i t l t t i l t t . t . li l i . . i i ilit t i ti i itt . i i ; t l t t nt; lt i t t t l ; ti li i t; i l lit l i . 1. Introduction . , . . 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. © 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.

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* Corresponding author. Tel.: +49 201 183-2765; fax: +49 201 183-2710. E-mail address: joern.berg@uni-due.de i t . l.: ; : .

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* 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. t . li l i . . i i ilit t i ti i itt .

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.2016.06.443