PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3353–336 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 il l li t . i i t. tr t r l I t rit r i ( )

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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 simulation of mesomechanical behavior of porous brittle materials I.Yu. Smolin a,b *, P.V. Makarov a,b , M.O. Eremin a,b , K.S. Matyko a a Tomsk State University, Lenin Prospekt, 36, Tomsk 634050, Russia b Institute of Strength Physics and Materials Science SB RAS, Pr. Akademicheskii, 2/4, Tomsk 634055, Russia The influence of the types of porous structure on the features of deformation, damage accumulation and fracture of mesovolumes of brittle materials is studied. At the mesoscale, the pores of different shape are taken into account explicitly. The digital models were made using random values of coordinates and radii of spherical voids or solid spheres. For numerical modeling of the mechanical behavior up to failure, the evolutionary approach is applied with considering the nonlinear constitutive equations to describe damage accumulation and its influence on the degradation of the strength properties of the frame of porous ceramics. The calculated averaged stress-strain diagrams were shown to be sensitive not only to the value of porosity but also to the shape of pores. T e simulation results are validated with experimental data for zirconia a d alumina ceramics. Good qualitative and quantitative agr ement of modeling results with experimental ata sugge ts that taking into acc unt of two-scale porosity in the form of explicit consideration of large pores at the mesoscale and implicit integrated consideration of ti y pores and cracks from the microscale in the form of accumulated damage is quite sufficient in the fram work of the hie archical modeling. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Ceramics; Porous structure; Modeling; Structure – property relationship; Damage. , , , k a t t i it , i t, , , i b I tit t f t t i t i l i , . i ii, / , , i influe t t s of poro s struct e on t t ti , mulati t f mesovolumes of brittle materials is studi . t t l , t i t t i t t li itl . i it l l i l i t ii i l i li . i l li t i l i t il , t l ti i li it i i t li tit ti ti t i l ti it i l t ti t t t ti t i . l l t t t i i t iti t l t t l it t l t t . i l ti lt li t it i t l t i i l i i . lit ti tit ti t li lt it i t l t t t t t i i t t t l it i t li it i ti l t t l i li it i t t i ti ti t i l i t l t i it i i t i t e t i i l li . © 2016 The thors. Publi h by Elsevier B.V. Peer-r i ibilit t i ti i itt f . : r i ; r tr t r ; li ; tr t r r rt r l ti i ; . 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

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

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Because of the manufacturing process, all cera ics acquire a certain degree of porosity. Of special interest are the highly porous ceramics that are widely used as filters, thermal insulator, catalyst, prosthetics, etc. The problems of t t i , ll i i t i it . i l i t t t l t , t l t, t ti , t . l i l i t t i l ilt , t l i

* Corresponding author. Tel.: +7-903-951-3401; fax: +7-382-249-2576. E-mail address: ismolin@ftf.tsu.ru rr i t r. l.: - - - ; f : - - - .

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* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 201 6 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. - t r . li l i r . . i i ilit t i ti i itt .

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.2016.06.418