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. ublishe by Elsevier B.V. Peer-review und 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) The definition of flow stress under dynamic loading based on relaxation model of plasticity N.S. Selyutina a,b, *, Yu.V. Petrov a,b a Saint Petersburg State University, 7/9, Universitetskaya nab., St. Petersburg, 199034, Russia b IPME RAS, Extreme States Dynamics Department, V.O., Bolshoj pr., 61, St. Petersburg, 199178, Russia Abstract The unstable behavior of the deformation curve under static and dynamic loading is predicted using the relaxation model of plasticity and Johnson-Cook models (classical and modified) at room temp ature. It is shown that the relaxation model of plasticity as continuation of structural-temporal approach describes various types the deformation curve for one material in a wide range of strain rates. The structural – temporal approach is an efficient and convenient tool for calculations in a much wider range of strain rates. An advantage of the yield stress calculations based on the structural-temporal approach is the minimal number of parameters, which do not require further modifications at high strain rates, in contrast to the empirical Johnson – Cook model and Cowper – Symonds formulas. The efficiency of the relaxation model of plasticity and structural-temporal approach is demonstrated using aluminum alloys as an example. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: Flow stress; Johnson-Cook model; yield strength; strain rate; incubation time 1. Introduction Recent publis ed st dies utilizing calculation of the dynamic yield strength such as the Johnston-Cook (Johnson and Cook (1985)), Cowper-Symonds (Cowper and Symonds (1957)) models and other modifications of various XXVII International Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) The definition of flow stress under dynamic loading based on relaxation model of plasticity N.S. Selyutina a,b, *, Yu.V. Petrov a,b a Saint Pete sburg S ate U iversity, 7/9, Universitetskaya nab., St. Petersburg, 199034, Russia b IPME RAS, Extreme States Dynamics Department, V.O., Bolshoj pr., 61, St. Petersburg, 199178, Russia Abstract The unstable behavi r of the deformation curve under static and dynamic loading is predicted using t e r l ti l f l ti it nd Joh son-Co k models (classical and modified) at room temperature. It is shown that the relaxation model of plasticity as continuation of structural-temporal approach describes various types the deformation curve f r one material in a wide range of str in rates. The structural – temporal approach is an efficient and convenient tool for c lculati ns in a much wider range of s rain rates. An advantage of the yield stress calculations based on the structural-temporal approa h is the minimal number of param ters, which d not require further modifications at high strain rates, in contrast to the empirical Johnson – Cook model and Cowper – Sy onds formul s. The effici n y of th relaxation model of plasticity and structural-temporal approach is demonstrated using aluminum alloys as an example. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: Flow stress; Johnson-Cook model; yield strength; strain rate; incubation time 1. Introduction R cent published tudies utilizing calculation of th dynamic yield strength such as the Johnston-Cook (Johnson and Cook (1985)), Cowper-Symonds (Cowper and Symonds (1957)) models and other modifications of various © 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. E-mail address: nina.selutina@gmail.com * Correspon ing author. E-mail address: nina.selutina@gmail.com

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers.

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

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.012