PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1035–1042 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

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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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Assessment of fatigue limits in historical welded railway bridges in Poland Wichtowski B., Hołowaty J. * West Pomeranian University of Technology, al. Piastów 50, Szczecin 71-311, Poland Fatigue limit assessment is an essential procedure when calculating global resistance and durability in welded bridges which have a longer period of service. During radiographic testing of early welded railway bridges, the welded butt splices were found to be in poor condition, with additional internal cracking. Fatigue testing of the cracked butt welds and strength analysis of the bridge connections were undertaken, which allowed the endurance limit for a particular bridge to be assessed. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Assessment, fatigue, weld joints, weld imperfactions, endurance; 1. Introduction The continued operation of historical teel bridges is a worldwide issue. Research indicat s that t is is a growing pr blem, resulting from both the neces ity to maint in required safe y levels under cr asing loadings, and from the negative impact of different types of degradation upon the structures. Practice shows that old bridges which, despite not entirely obeying the requirements of modern design codes or specifications, can in many cases safely carry service loads without any necessity for strengthening or replacement [Wichtowski (2002)]. A new railway line classification, taking into account vehicle categorizations along with new procedures for assessing carrying capacities, have been established to allow the rational management of railway infrastructure. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Assessment of fatigue limits in historical welded railway bridges in Poland Wichtowski B., Hołowaty J. * West Pomeranian University of Technology, al. Piastów 50, Szczecin 71-311, Poland Abstract Fatigu limit asses ment is an essential p ocedur when calculating glob l resistance and durability in welded bridges which hav a longer period of service. During radiographi testing of early welded railw y bridges, the welded butt splices were ound to b in poor condition, with dditional internal cracking. Fatigue tes ing of the racked butt welds and strength analysis of the bridge connections were undertaken, which allowed the endurance limit for a particular bridge to be assessed. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Assessment, fatigue, weld joints, weld imperfactions, endurance; 1. Introduction The continu d operation of hist rical steel bridges is a worldwide issu . Rese ch in icates that this is a growing problem, resulting from both the necessity to maint in required saf y levels under increasing loa ings, and from th egative impact of diffe nt types of degra ation upo the structur s. Practice shows th t old bridges which, d spit not entirely obeying the requirements of modern d sign codes or specifications, can in many cases safely carry service loads without any necessity for strengthe ing r replacement [Wichtowski (2002)]. A new railway line classification, taking into account vehicle categorizations along with new procedures for assessing carrying capacities, have been established to allow the rational management of railway infrastructure. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 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. Abstract

* Corresponding author. Tel.: +48 603 116 273; fax: +48 91 4844451. E-mail address: janusz.holowaty@zut.edu.pl * Correspon ing author. Tel.: +48 603 116 273; fax: +48 91 4844451. E-mail address: janusz.holowaty@zut.edu.pl

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.2017.07.066 * 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.