PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 46 –467 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Shock-induced struct al instability and dynamic strength of metals Аlexandre Div kov a , Yurii Meshcheryakov a , N.M. Silnikov b * a Institute of Problems of the Mechanical Engineering RAS, Saint-Petersburg,199178, Russia b Special Material Ldt, Saint-Petersburg, 194044, Russia Abstract The shock tests of set of metals show that together with well-known dynamic strength-characteristics of material such as dynamic yielding limit and spall strength, the additional characteristics, namely, threshold of structural instability under shock compression, defect of the velocity at the plateau of compressive pulse and particle velocity variance at the mesoscale should be introduced into analysis of dynamic strength of materials. The structural instability threshold registered in uniaxial strain conditions allows the resistance to penetration in Tate-Alekseevskii equation to be determined. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: shock loading, structural instability, dynamic fracture , mesoscale, velocity variance. 1. Introduction On of act al problems of high-velocity d formation and fracture is thought to be the investigation of the processes concerning to shock-induced structural instabilities. Structural transformations in the form of shear bands, dynamic rotations, phase transitions and other processes which lead to change of structure of material are the result of local instabilities. As a rule, dynamic deformation flows over the numerous channels simultaneously - dislocation sliding, twinning, diffusion of point defects, rotational modes, shear bands and so on. Herewith, deposit of each mechanism cannot be exactly identified. Grady and Asay (1976) developed a model of localization in which the main role is assigned to local thermal softening of material. They supposed that joint action of high hydrostatic pressure and shear can lead to increasing the temperature in the regions of maximum intensity of plastic flow (for example, in the places of dislocation 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Shock-induced structural instability and dynamic strength of metals Аlexandre Divakov a , Yurii Meshcheryakov a , N.M. Silnikov b * a Institute of Problems of the Mechanical Engineering RAS, Saint-Petersburg,199178, Russia b Special Material Ldt, Saint-Petersburg, 194044, Russia Abstract The shock tests of set of metals show that together with well-kn wn dynamic strength-characteristics f material such as dynamic yielding limi and spall strength, t e addi ional characteristics, namely, thres old of structural instabi ity under shock compression, defect of the veloci y at the plateau of compressive pulse and par icle ve ocity va iance at the mesoscale should be introduced into analysis of dynamic streng h of material . The structural instability threshold registered in uniaxial strain conditions allows the re istance to penetration in Tate-Alekseevskii eq ation to be determined. © 2016 The Authors. Published by Els vier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: shock loading, structural instability, dynamic fracture , mesoscale, velocity variance. 1. Introduction One of actual problems of high-velocity deformation and fr cture is ought to b the investigation of the processes concerning to shock-induced structural instab lities. Structural transformations in form of shear bands, dynamic rotations, phase transitions and other processes which lead to change of structure of material are the result of local ins abilities. A a ule, dy amic defo mation flows over the numerous channels simultaneously - dislocation sliding, twinn ng, diffusion of point defects, rotational modes, s ear bands and so on. Herewith, depos t f each mechanism cannot be exactly identifie . Gr dy and Asay (1976) dev loped a model of localization in which the main role is assigned to local thermal softening of material. They supp sed that j int acti n of high hydrostatic pressure and shear can lead t increasing the temperature in the r gions f maximum intensity of plastic flow (fo example, in the plac s of disloc t on Copyright © 2016 Th Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 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 * Cor esponding author. Tel.: +7-9 1- 26-01-00. E-mail ddress: Nikita.Silnikov@npo-sm.ru * Corresponding author. Tel.: +7-911-126-01-00. E-mail address: Nikita Silnikov@npo-sm.ru

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.060 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21.