PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1019–1026 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal The brittle fracture behaviour of old mild steels Lars Sieber a *, Richard Stroetmann b a Dresden University of Applied Sciences, Dept. Civil Engineering, Friedrich-List-Platz 1, 01069 Dresden, Germany b Technische Universität Dresden, Institute of Steel and Timber Construction, August-Bebel-Str. 30, 01219 Dresden, Germany In the assessment of old steel structures the verification of sufficient material toughness is important for the decision on necessary repair and reinforcement measures. Based on extensive fracture mechanics investigations the assessment methods in EN 1993-1 10 were develo ed. The determination of permissible element thickness for certain steel grades was determined for welded structures made of current steel grades (according to DIN EN 10025) with mostly high toughness’s. This simplified method is not suitable for old mild steel structures with holes for riveted joints. In this article, experimental studies of the brittle fracture behaviour of structures with holes made of old mild steel are presented. The results were carried out through various research projects at the Technische Universität Dresden and its cooperation partners (see, e.g. Stroetmann et al. (2015)). The main topics are extensive material analyses to determine the fracture toughness in the brittle-ductile transition region according to the Master Curv concept. The evaluations co firm that different steel grades can be defined depending on the manufacturing process of the old steels. Additionally, the newly obtained results are compar d to existi g correlations of impact and fractur toughness and ar checked for th ir suitability for old mild st ls. Furthermore, the an lysis of metallog aphy and m chanical properties on components with punched holes are described to analyse the crack initiation of quasi-static stressed components made of ld mild ste l. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: brittl fract re, embrittlement due to ageing, notch impact test, fracture mechanics 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal The brittle fractu e behaviour of old mild steels Lars Sieber a *, Richard Stroetmann b a Dresden Universi y of Applied Sciences, D pt. Civil Engineering, Friedrich-List-Platz 1, 01069 Dresden, Germany b Technische Universität Dresden, Institute of Steel and Timber Construction, August-Bebel-Str. 30, 01219 Dresden, Germany Abstract In the assessment of old steel structures the verification of sufficient material toughness i important for the decision on necessary repair and reinforcement m asures. Based on exten ive fracture mechanic investig tions the asses ment methods in EN 1993-1 10 wer developed. The det rmination of permissible element thickness f r certain steel grades was determined for welded tructures ma e of curr nt steel grades (according to DIN EN 10025) with mostly h gh toughness’s. T is simpli ied m thod is not suitable for old mild steel structures with hol s fo riv ted joints. In this article, experimental studies of the brittl fracture behaviour of structur s w th holes made of ol mild ste l are prese ted. The results were carried out through various research projects at the echnische Universitä Dresden and its coop ra ion partners (s e, e.g. Str etmann et al. (2015)). The main topics are extensive material analyses t deter ine the fractur toughness i the brittl -ductile transition regio accordi to th Master Curve concept. The evaluations confirm that different steel grades can be defined d pending on the m ufacturing process of the old ste ls. Additionally, the newly obtained result are compared o existing c rrelations of impact and fr cture toughnes a d are ch cked for their suitability for old mild steels. Furthermore, the analysis of metallography and mechanical properties on components with punched holes are described to analyse the crack initiation of quasi-static stressed components made of old mild steel. © 2017 The Authors. Published by Elsevi r B.V. Peer- evi w und r responsibil ty of the Scientific Committee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. * Corresponding author. Tel.: +49 351-462-3815; E-mail address: lars.sieber@htw-dresden.de Keywords: brittle fracture, embrittlement due to ageing, notch impact test, fracture mechanics * Correspon ing author. Tel.: +49 351-462-3815; E-mail address: lars.sieber@htw-dresden.de Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.160 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.