PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable online at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 2606–2613 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 Strength of wat r-filled permeable elastic-plastic medium under shear accompanied by compression: A theoretical study Andrey V. Dimaki a, *, Evgeny V. Shilko a , Sergey G. Psakhie a,b a Institute of Strength Physics and Materials Science SB RAS, 634055 Tomsk, Russia b National Research Tomsk Polytechnic University, 634050 Tomsk, Russia We have theoretically studied shear strength of an elastic-plastic water-filled interface between purely elastic permeable blocks under initial compression. We used a recently developed “hybrid” model that combines discrete element method and finite difference approach. In the framework of the model the multiscale porous structure is taken into account implicitly by assigning the porosity and permeability values for the enclosing skeleton which determine the rate of filtration of a fluid. Macroscopic pores and voids are taken into account explicitly by specifying the geometry of discrete elements computational domain. The relationship between he stress-strain state of the solid skel ton nd pore fluid pressure is described in the framework of he Biot’s model of poroelas ticity. The results of simulation show that shear strength of an elastic-plastic interface depen s non linearly on the values of permeability and loading parameters. We have pr posed an analytical r lation that approximates the obtained results of numerical simulation. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Permeability; plasticity; shear loading; strength 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Strength of water-filled permeable elastic-plastic medium under shear accompanied by compression: A theoretical study Andrey V. Dimaki a, *, Evgeny V. Shilko a , Sergey G. Psakhie a,b a Institute of Strength Physics and Materials Science SB RAS, 634055 Tomsk, Russia b National Research Tomsk Polyt chnic University, 634050 Tomsk, Russia Abstract We have theoretically studied shear strength of an elastic-plastic water-filled interface between purely elastic permeable blocks under initial compression. We used a recently developed “hybrid” model that combin s discrete elemen method and finite diff ence ppr ach. In the framework of the mo l the multiscale porous struc ure is taken into account implici ly by assig ng the porosity and permeability values f r enclosing ske eton which dete mine the rat of filtrati n of a flu d. Macroscopic pores and voids ar taken nto ccount explicitly by specifying the geomet y of discrete elements computational domain. The relationship betwe n th stress-strain state of he solid skeleton and p re fluid pre sur is described in the framework of t Bio ’s model of poroelas ticity. The re ults s mulation show that shear s rength of an elastic-plastic terface depends non lin arly on the values of pe mea lity and l ad ng parameters. We have proposed an nalytical rela ion that pproximat s the obt ined results of numerical simulation. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: Permeability; plasticity; shear loading; strength A liquid in a pore volume influences on a strength of porous permeable media, both brittle and elastic-plastic (Taylor (2007), Pan and Connell (2007), Zavsek et al. (2013)). Des ite of th dilation of e la er, pore pressure of a liquid can remai nonzer under constrai ed shear loading. In the r sult, a liquid pressure contribute into a st ss- 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. © 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. A liquid in a pore volume influences on a strength of porous permeable media, both brittle and elastic-plastic (Taylor (2007), an and Co nell (2007), Zavsek et al. (2013)). Despite of the dilation of the latter, a pore pressure of a liquid can remain nonzero under constrained shear loading. In the result, a liquid pressure contribute into a stress- Abstract 1. Introduction 1. Introduction

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review un r 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.: +7-3822-286-971 ; fax: +7-3822-286-971. E-mail address: dav@ispms.tsc.ru * Corresponding author. Tel.: +7-3822-286-971 ; fax: +7-3822-286-971. E-mail address: dav@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.2016.06.326