PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable online at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 409–416 Available online at www.sciencedirect.com Sci nceDirect 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 Numerical analysis of the geometrical and material criteria of acceleration of shear crack to supershear velocity in brittle nanoporous solids Evgeny V. Shilko a *, Sergey G. Psakhie a , Valentin L. Popov b a Institute of Strength Physics and Materials Science SB RAS (ISPMS SB RAS), 2/4, pr. Akademicheskii, 634055 Tomsk, Russia b Berlin University of Technology (TU Berlin), Sekr. C 8-4, Str. D s 17. Juni 135, D-10623 Berlin, Germany The paper is devoted to the study of dynamic propagation of mode II cracks in porous brittle materials with nanoscale pore size. We compared static (shear strength) and dynamic parameters of crack growth in dry and fluid saturated nanoporous brittle materials at different degrees of confinement. We have shown that pore fluid in nanoporous brittle materials influences mainly the dynamics of crack propagation. This leads in particular to pronounced peculiarities of the dependence of the critical value of dimensionless geometrical parameter of the initial cra k (it maj rizes the interv l of the ratios of length to thickness for the cracks that are capable to accele ate to intersonic velocity) on appli d crack normal stress. Th results of th study re relevant for understanding the conditions of supershear regime of p opagation of mode II cra ks as well as for assessment of the ability of mode II cracks in brittle materials (including nanoporous fluid-saturated solids) to develop in supershear regime. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: brittle solid; mode II crack; sub-Rayleigh-to-supershear transition; fluid; pore pressure; modeling; hybrid cellular automata method 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Numerical analysis of the geometrical and material criteria of acceleration of shear crack to supershear velocity in brittle nanoporous solids Evgeny V. Shilko a *, Sergey G. Psakhie a , Valentin L. Popov b a Institute of Strength Physics and Materials Science SB RAS (ISPMS SB RAS), 2/4, pr. Akademicheskii, 634055 Tomsk, Russia b Berlin University of Technology (TU Berlin), Sekr. C 8-4, Str. Des 17. Juni 135, D-10623 Berlin, Germany Abstract The paper is devoted to the study of dynamic propagation of mode II cracks in porous brittle materials with nanoscale pore size. W compare sta ic (shear strength) a d dynamic parameters of crack growth in dry and fluid satura ed nanoporous brittl materials at ifferent degree of confinement. We have shown that pore fluid in nanoporous brittle materials influences ma n y the dynamics o crack propagation. This leads in particular to pronounc d peculiarities f the dependenc of the critical value of dimensionle s geometrical parameter of the initial crack (it majorizes the interval of the ratios of length to thickness for the cracks th t are capable to accelerate to in erso ic velocity) appl ed crack o m l tress. The results of the s udy are relevant for unders anding the conditions of supershear regime of propagation of ode II cr cks a well as for a sessmen of the abi ity of mod II cracks in brittle ma erials (including nanoporous fluid-s turated solids) to develop in supersh r r gi . © 2016 The Authors. Published by Elsevier B.V. Peer-review under esponsibility of the Scientific Committee of ECF21. Keywords: brittle solid; mod II crack; sub-Rayleigh-to-supershear transition; fluid; pore pressure; modeling; hybrid cellular automata method 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. Abstract

1. Introduction

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. The conditions defining the regime and, in particular, the velocity of dynamic propagation of longitudinal shear (mode II) cracks in brittle materials are widely studied and analyzed over the past few decades. Considerable interest in this subject is concerned with its close connection with the problems of fracture of multiphase materials, the The conditions defining the regime and, in particular, the velocity of dynamic propagation of longitudinal shear (mode II) cracks in brittle mat rials are wi ely stud ed nd analyzed over the past few dec des. Considerable inter st in this subje t is concerned with its close connection with the probl ms of fracture of multipha e m terials, the

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 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 r sponsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +7-382-228-6971; fax: +7382-249-2576. E-mail address: shilko@ispms.tsc.ru * Corresponding author. Tel.: +7-382-228-6971; fax: +7382-249-2576. E-mail ad ress: shilko@ispms.tsc.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.2016.06.053