PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1811–1816 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

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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. ECF22 - Loading and Environmental effects on Structural Integrity Dynamic Deformation and Fracture Toughness of Pipe Steel Bragov A.M. a *, Konstantinov A.Yu. a , Lomunov A.K. a , Petrov Yu.V. b , Basalin A.V. a a Research Institute of Mechanics, National Research Lobachevsky State University, 23/6 Gagarin Ave., Nizhny Novgorod 603950, Russia b Institute of Problems of Mechanical Engineering RAS, V.O., Bolshoj pr., 61, St.Petersburg 199178, Russia Abstract Results of dynamic tests of pipe steel of strength category of 650 MPa on dynamic strength, fluidity and fracture toughness are presented. The stress-strain curves for shock tension and the dependence of the ultimate destruction characteristics of materials on the strain rate and te perature are constructed. To obtain the parameters of dynamic fracture toughness, modifications of the Kolsky method were used on tension a solid cylindrical specimen weakened by an annular V-notch. The work and fracture toughness are determined. To describe the velocity dependences of the utmost characteristics of the fracture toughness, a well-known Morozov Petrov incubation time criterion was used. © 2018 The Authors. Published by Elsevier B.V. Peer-review under resp sibility of the ECF22 organizers. Keywords: pipe steel; Kolsky method; strength; fracture toughness; Morozov-Petrov's incubation time criterion; fractographic analysis 1. Introduction Trunk oil and gas pipelines in the northern latitude ar oper ted in difficult climatic conditions, nam ly, with te peratures of outs de air to minus 60°C. Throughout th ir life cycle the pipelines undergo impacts characterized by different levels of elastoplastic deformation of the pipe wall: transportation of pipes to the site of construction, installation and welding, long-term operation in conditions of seasonal shift and swelling of soil, significant negative temperatures, possible man-caused impacts, etc. Elastoplastic deformation causes complex and diverse processes in the structure of crystalline materials, starting from the meso- to the macro-level. These processes significantly change the corrosion-mechanical characteristics of materials, especially if it is a cold plastic deformation. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Dynamic Deformation and Fracture Toughness of Pipe Steel Bragov A.M. a *, Konstantinov A.Yu. a , Lomunov A.K. a , Petrov Yu.V. b , Basalin A.V. a a Research Institute of Mechanics, National Research Lobachevsky State University, 23/6 Gagarin Ave., Nizhny Novgorod 603950, Russia b Institute of Problems of Mechanical Engineering RAS, V.O., Bolshoj pr., 61, St.Petersburg 199178, Russia Abstract Results of dynamic tests of pipe steel of strength category of 650 MPa on dynamic strength, fluidity and fracture toughness are presented. The stress-strain curves for shock tension and the dependence f the ultimate destruction characteristics of materials on th strain rate and temperature are constructed. To obtain the parameters of dynamic fr ctur to ghness, modifications of the Kolsky m thod were used on t nsion a solid cylindrical specimen weakened by an a nular V-notch. The work an fr cture t ughness are determined. To describe the velocity dependences of the utmost char cteristics of the fracture toughness, a well-known Morozov P trov i cubation time crit rion was used. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: pipe steel; Kolsky method; strength; fracture toughness; Morozov-Petrov's incubation time criterion; fractographic analysis 1. Introduction Tru k oil and gas pipelines in the northern latitudes are op rated in difficult climatic conditions, n mely, with temperatures of outside air to minus 60°C. Throughout their life cycle the pipelines undergo impacts charact rized by different levels of elastoplastic deformation of the pipe wall: transportation of pipes to the site of construction, installation and welding, long-term operation in conditions of seasonal shift and swelling of soil, significant negative temperatures, possible man-caused impacts, etc. Elastoplastic deformation causes complex and diverse processes in the structure of crystalline materials, starting from the meso- to the macro-level. These processes significantly change the corrosion-mechanical characteristics of materials, especially if it is a cold plastic deformation. © 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 organizers. * Corresponding author. Tel.: +7-831-465-1622; fax: +7-831-465-6025. E-mail address: bragov@mech.unn.ru * Corresponding author. Tel.: +7-831-465-1622; fax: +7-831-465-6025. E-mail ad ress: bragov@mech.unn.ru

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.2018.12.355