PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 16 –16 4 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t gri y Procedia 00 (2018) 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. ECF22 - Loading and Environmental effects on Structural Integrity Analysis of strain distribution in overmatching V groove weld using digital image correlation N. Milosevic a , A. Sedmak a , R. Jovicic b a Faculty of Mechanical Engineering of University of Belgrade b Innovation center of Faculty of Mechanical Engineering of University of Belgrade Abstract Welded joints are treated as critical sites when constructing and calculating welded structures due to inhomogeneity and anisotropy of materials at the welded joint site. Because of the change in the geometry of the elements, the welded joint is viewed as the location of the stress concentration and therefore as a place that weakens the overall load capacity of the structure. Due to this approach in the design of welded structures, practice requires that in most cases welded joints are performed with better mechanical properties compared to the base metal. A welded joint that is made so that the mechanical properties of the weld metal exceed the mechanical properties of the base metal is called the overmatching welded joint. This paper presents the measurement of the strain over the 'overmatching' welded V joint using the DIC (Digital Image Correlation) method and the analysis of the strain distribution is provided. The strain distribution obtained is interesting because it shows that in the stress concentration points the strain have almost minimal values. © 2018 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the ECF22 organizers. Keywords: Strain distribution analysis; Overm tching weld; Digital Image Correlation; Welded joints 1. Introduction Welded structures have a large share in almost all industries. Bearing this in mind, it is easy to conclude that the knowledge of the stress-strain condition of welded structures is crucial for the integrity of the construction itself and for the safety of the people who are using it. Since welded joints are by their nature heterogeneous and anisotropic, every effort is made to their stress and strain state fully determine. Since the strain distribution mechanisms are not fully known, in practice it usually goes, that the mechanical properties of the weld metal to be better than the mechanical properties of the base metal in order to ensure structural integrity. Such joints are called "overmatching" welded joints. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Analysis of strain distribution in overmatching V groove weld using digital image correlation N. Milosevic a , A. Sedmak a , R. Jovicic b a Faculty of Mechanical Engineering of University of Belgrade b Innovation center of Faculty of Mecha ical Engineering of Univ rsity of Belgrade Abstract Welded joints are treated as critical sites when constructing and calculating welded structures due to inhomogeneity and anisotropy of materials at the welded joint site. Because of the change in the geometry of the elements, the welded joint is viewed as the location of the stress concentration and therefore a a plac that weakens the overall load capacity f the structure. Due to this approach in the design of welded structures, practice requires that in most cases welded joints are performed with bett r mechanical properties compared to the base metal. A welded joint that is made so that the mechanical properties of the eld metal ex eed the mechanical properties of the base metal is called the overmatching welded joint. This paper presents the measure ent of th strain over the 'overmatching' welded V joint using the DIC (Digital Image Correlation) method and th analysis of the strain distributio is provided. The strain distribution obtained is interestin because it shows that in the stress concentration points the strain have almost minimal values. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organiz rs. Keywords: Strain distributio naly is; Overmatching weld; Digital Imag Correlat on; W lded joints 1. Introduction Welded structures have a large share in almost all industries. Bearing this in mind, it is easy to conclude that the knowledge of the stress-strain condition of welded structures is crucial for the integrity of the construction itself and for the safety of the people who are using it. Since welded joints are by their nature heterogeneous and anisotropic, ever effort s made to the r stress and strain state fully determine. Since the strain distribution mechanisms are not fully known, in practice it usually goes, that the mechanical properties of the weld metal to be better than the mechanical properties of the base metal in order to ensure structural integrity. Such joints are called "overmatching" welded joints. © 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 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.337