PSI - Issue 13

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 Structu al Integrity 13 (2018) 994–999 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Integrity assessment of ammonia spherical storage tank Aleksandar Milovanović 1 , Aleksandar Sedmak 2 1 D.Sc.student, Faculty of Mechanical Engineering, University of Belgrade, Serbia 2 Faculty of Mechanical Engineering, University of Belgrade, Serbia Abstract The integrity of the ammo i spherical tank (with a volume of 1800 m3 and the outer diameter of 15 20 mm, nominal wall thickness 30 mm) was analyzed due to discovered cracks on the longitudinal and transverse but joints of the segments, of different lengths and depth. The calculation according to EN 13445-3: 2014 specifies the minimum required spherical shell wall thickness. The finite element method was used to analyze the cracks and determine the hoop stress value. The stress intensity factor for the analysed cracks was analytically determined, and the obtained values were compared with the critical value of the stress intensity factor to assess the integrity of the observed structure. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: structure integrity; stress intensity factor; spherical tank; finite element method; calculation of spherical shell wall thickness; 1. Introduction The ammonia sp er cal tank (with a volume of 1800 m3, outer diameter D s = 15120 mm and nominal wall thickness s e = 30 mm), with maximum w rking pressure p = 16 bar and test pressure p i = 20,8 bar, was tested in 2017 using non destructive methods (NDT) by an accredited laboratory. A number of cracks were found on the longitudinal and transverse butt joints of the segments, three most critical of which no. 173, no. 203 and no. 197, shown in Figures 1.a and 1b, were analyzed in this paper. These cracks were treated with a profile milling cutter, and the tank was not remediated by welding, but the cracks were analyzed by finite element method. ECF22 - Loading and Environmental effects on Structural Integrity Integrity assessment of ammonia spherical storage tank Aleksandar Milovanović 1 , Aleksandar Sedmak 2 1 D.Sc.student, Faculty of Mechanical Engineering, University of Belgrade, Serbia 2 Faculty of Mechanical E gineering, University of Belgrad , Serbia Abstract The integrity of the ammonia spherical tank (with a volume of 1800 m3 and the outer diameter of 15120 mm, nominal wall thickness 30 m ) was analyzed due to disco ered racks on the longitudinal and transverse but joints f the segments, of different lengths nd depth. The calculation cording to EN 13445-3: 2014 p cifies the minimum required spherical shell wall thickness. The finite element method was used to analyze the cracks and determine the hoop stress value. The str ss intensity factor for the analysed cracks wa analytically determined, and th obtained values were compared with the critical value of the stres intensity factor to assess the integrity of the serv str cture. © 2018 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the ECF22 organizers. Keywords: structure integrity; stress intensity factor; spherical tank; finite element method; calculation of spherical shell wall thickness; 1. Introduction The ammonia sp erical tank (with a volume of 1800 m3, outer diameter D s = 15120 mm d nominal wall thi kness s e = 30 mm), with maximum working pressure p = 16 bar and test pressure p i = 20,8 bar, was tested in 2017 using on destructive methods (NDT) by an accr dited laboratory. A number of cracks were found on the longit di al and transverse butt joints of the segments, three most critical of which no. 173, no. 203 and no. 197, s own in Figures 1.a and 1b, were analyzed in this paper. Th se cracks were treated with a profile milling cutter, and the tank was not remediated by welding, but the cracks were analyzed by finite element method. © 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 r sponsibility of the ECF22 o ganizers.

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.2018.12.185