PSI - Issue 6

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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. Copyright © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Comparative analysis of characteristics of material damage at various load speeds by electric explosion of conductors Morozov V.A. a, ∗ , Atroshenko S.A. a,b , Kats V.M. a a St.-Petersburg State University, St. Petersburg, 199034, Russia b Institute of Problems of Mechanical Engineering St. Petersburg, 199178, Russia Abstract The results of xperimentation o the destruction of cylindrical samples made from PMMA and fluoropla t with the help of electric explosion of conductor (EEC) at various loading speeds are presented. The character of fracture of PMMA and fluoroplast as a result of dynamic loading by exploding a conductor is analyzed. c 2017 The Authors. Published by Elsevier B.V. er-review under responsibility of the CM 2017 organizers. Keywords: electric explosion of conductor; PMMA; fluoroplast; fracture 1. Introduction Among the many methods of high-speed loading, deformation and fracture of materials, one can single out the recently used electrophysical methods based on electric explosion of conductors (EEC) (in Imbert et al. (2015), Morozov et al. (2016)). Experimental studies are needed to obtain reliable data on the stress-strain state of materials at high deformation rates to understand the mechanisms of high-speed deformation and fracture of materials for the development of a more adequate models. The subject of this work is to develop a method for loading and deformation of cylindrical samples by electric explosion of conductors and carry out structural analysis of the fracture surfaces. During the explosion of conductor procedure conductor is placed in a cylindrical shape sample, which is then allowed to evaporate at the passage of electric current through it from the charger. The complexity of this loading method is to determine the radial pressure. This di ffi culty is overcome by said pressure measurements using a specially designed piezo-sensor in this work. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Co parative analysis of characteristics of material damage at various load speeds by electric explosion of conductors Morozov V.A. a, ∗ , Atroshenko S.A. a,b , Kats V.M. a a St.-Petersburg State University, St. Petersburg, 199034, Russia b Institute of Problems of Mechanical Engineering St. Petersburg, 199178, Russia Abstract The results of experimentation on the destruction of cylindrical samples made from PMMA and fluoroplast with the help of electric explosion of conductor (EEC) at various load speeds are presented. The character of fracture of PMMA nd fluoroplast as a result of dynamic loading by exploding a conductor is analyzed. c 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: electric xplosion of conducto ; PMMA; fluoroplast; fracture 1. Introduction Among the many methods of high-speed loading, deformation and fracture of materials, one can single out the recently used electrophysical methods based on electric explosion of conductors (EEC) (in Imbert et al. (2015), Morozov et al. (2016)). Experimental studies are needed to obtain reliable data on the stress-strain state of materials at high deformation rates to understand the mechanisms of high-speed deformation and fracture of materials for the development of a more adequate models. The subject of this work is to develop a method for loading and deformation of cylindrical samples by electric explosion of conductors and carry out structural analysis of the fracture surfaces. During the explosion of conductor procedure conductor is placed in a cylindrical shape sample, which is then allowed to evaporate at the passage of electric current through it from the charger. The complexity of this loading method is to determine the radial pressure. This di ffi culty is overcome by said pressure measurements using a specially designed piezo-sensor in this work. © 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 ∗ Corresponding author. Tel.: + 7-911-730-85-36. E-mail address: v.morozov@spbu.ru ∗ Corresponding author. Tel.: + 7-911-730-85-36. E-mail address: v.morozov@spbu.ru

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2210-7843 c 2017 The Authors. Published by Elsevier B.V. Peer-revi w under responsibility of the MCM 2017 organizers. 2210-7843 c 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.024