PSI - Issue 6

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 6 (2017) 146–153 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. Copyright © 2017 The Auth rs. 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) Shock-induced Structural Heterogenization Yurii Meshcheryakov a *, Grigorii Konovalov a , Alexandre Divakov a , Natali Zhgacheva a , Evgenii Osokin b a Institute of Problems jf Mechanical Engineerin RAS, V.O Bolshoi 61, Saint-Petersburg 199178, Russia b Central Research Institute of Constructional Materials “Prometeii”, Shpalernaya 14, Sant -petersburg, 165114, Russia Abstract Structural instabili y threshold under shock compressi n is f und to determine trans tion to structural heterogenization f material. In our experiments, the threshold of structural instability is determined in shock loading under uniaxial strain conditions. Two kinds of aluminum alloy have shown different macroscopic response on shock loading - the free surface velocity profiles for both materials displays oscillations at the top of plastic front, the period of oscillations turns out to distinct by eight times. The structural investigations of post-shocked specimen also reveal a difference in the mean size of shock-induced elementary cells of mesostructure for both alloy. Furthermore, it correlates with the corresponding period of plastic oscillations. The conclusion is made that resonance interaction of plastic oscillations and internal mesostructure can be considered to be the reason for beginning the structural instability and further heterogenization of materials. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: shock loading; plastic flow oscillations; threshold of structural instability; multiscale dynamic deformation; heterogenization One of basic problems of multiscale dynamic deformation is known to be a determination of mechanism for impulse and energy transportation from one scale to another. This mechanism defines the character of heterogenization of material and its ultimate dynamic plasticity and strength. Shock-induced structural transformation which is responsible for formation of shear bands, dynamic rotations and other large-scale inhomogeneities are the result of structural instabilities. One of the first models of structural instability in which the main role belongs to local heat softening of material by mean of direct channeling the energy from external action to atom-dislocation scale level has been developed by Grady and Kipp (1987). Authors supposed that common action XXVII International Conference “Ma hematic l and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Shock-induced Structural Heterogenization Yurii Meshcheryakov a *, Grigorii Konovalov a , Alexandre Divakov a , N tali Zhgacheva a , Evge ii Osok b a Institute of Probl ms jf Mechanical Engineerin RAS, V.O Bols oi 61, Saint-Petersburg 199178, Russia b Central Research Institute of Constructio al Materials “Prometeii”, Shpalernaya 14, Sant -petersburg, 165114, Russia Abstract Structural instability threshold under shock c mpression is found o determine a transition to structural h terogeniz tion of material. In our experiments, the threshold of tructural instability is determined in shock loading under uniaxial str in conditions. Two kinds of luminum a lo have sh wn different macroscopic response on sho k loading - the free surfa e velocity profiles for both m terial display scillations at the top of pla tic front, the p iod of oscillatio turns out to distinct by eigh times. The structu al inv stigations of post-shocked specimen also reveal a difference in the mean size of sh ck-induced elementary cells of mesostructure for both alloy. Furthermore, it correlates w th the corresponding period of plastic oscillations. The conclusion is mad that resona ce interaction of plastic oscillations and in e nal mesostructure can be considered to be the reason for beginning the structural instability and further heterogenization of materials. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: shock loading; plastic flow oscillations; threshold of structural instability; multiscale dynamic deformation; heterogenization 1. Introduction One of basic problems of multiscale dynamic deformatio is known to b a determination of mechanism f r impulse and energy tr nsportation from one scale to another. This mecha ism defines the character of heterogenization of material and its ultimate dynamic plasticity and strength. Shock-induced structural transformation which is resp n ible for formation of shear bands, dynamic rotations and other large-scal inhom gen ities are the result of structural instabilities. One of the first mod ls of structural instability in which the main role belongs to local heat oft ing of material by mean of direct channeling the energy from external action to atom-dislocation scale level has been developed by Grady and Kipp (1987). Authors supposed that common action © 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. 1. Introduction

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 201 7 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 2452-3216 © 201 7 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.2017.11.023