PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 7 –7 4 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralI tegrity 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 Temporal effects of dynamic yielding under high-rate loading 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 A modeling of various effects of high-rate plastic deformation of metals on the basis of the relaxation model of plasticity is considered. It is shown that the relaxation model of plasticity is an effective tool to describe both temporal dependencies of the yield stress and a well-known yield stress drop effect on the deformation curve from the united viewpoint. One of the problems is that the classical Johnson-Cook model and its modifications describe only gradient junction on the stage of plastic deformation utilizing a smooth degree function of hardening. For higher strain rates, e.g. above 1000 1/s, modifications of these empirical models for prediction of the yield strength are required. A comparison of material hardening parameters of the modified Johnson Cook model and parameters calculated within the relaxation model of plasticity is given. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Type your keywords here, separated by semicolons ; 1. Introduction Recent published studies utilizing calculation of the dynamic deformation curve such as the Johnston-Cook (Johnson and Cook (1985)), Zerilli-Armstrong (Zerilli and Armstrong, 1987) integrated Johnson-Cook and Zerilli-Armstrong (Che et al. 2018) models and other modifications of various models, show that applied in numerous engineering software tools empirical models do not have versatility when used in the field of high-speed loading of materials. The structural-temporal approach for definition the yield strength on the basis of the introduction of a characteristic time of the stress relaxation proved oneself to be an alternative approach for describing temporal effects in the high-speed deformation of metals (Gruzdkov and Petrov (1999)). This approach was applied in those strain rate ranges in which the classical Johnson-Cook empirical formula and its modifications do not work ECF22 - Loading and Environmental effects on Structural Integrity Temporal effects of dynamic yielding under high-rate loading 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, Ext eme Sta es Dy amics Department, V.O., Bolshoj pr., 61, St. Petersburg, 199178, Russia Abstract A modeling of various effects of high-rate pl stic deformatio of metals on the basis of the relaxation model of plasticity is considered. It is shown that the relaxation model of plasticity is an effective tool to de cribe both temporal dependencies of the yield st ss and a well-known yield stress drop ffect on the deformation curve from th unit d viewpoint. One of th problems is that the classical Johnso -Cook model and its modifications describe only gradient junction on the stage of plastic deformation utilizing a mooth degree function of har ening. For higher strain rates, e.g. above 1000 1/s, modifications of hes empirical models for prediction of the yield strength are required. A compar son of material hardening parameters of the modified Johnson C ok model and parameters calculat d within the relaxation odel f plasticity is given. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Type your keywords here, sep rated by semicolons ; 1. Introduction Recent published studies utilizing calculation of the dynamic deformation curve such as the Johnston-Cook (Johnson and Cook (1985)), Zerilli-Armstrong (Zerilli and Armstrong, 1987) integrated Johnson-Cook and Zerilli-Armstrong (Che et al. 2018) models and other modifications of va ious models, show that applied in numerous engineering software tools empirical mode s do not have versatility wh n us d in the field of high-speed loading of materials. The structural-temporal approach for definition the yield strength on the basis of the introduction of a characteristic time of the stress relaxation proved oneself to be an alternative approach for describing temporal effects in the high-speed deformation of metals (Gruzdkov and Petrov (1999)). This approach was applied in those strain rate ranges in which the classical Johnson-Cook empirical formula and its modifications do not 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 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. * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: nina.selutina@gmail.com * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail ad ress: nina.selutina@gmail.com

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.2018.12.116