PSI - Issue 13

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 13 (2018) 298–3 3 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Defect Structure of Deformed Heterogeneous Materials: Acoustic Emission and X-Ray Microtomography Ekaterina Damaskinskaya a *, Ivan Panteleev b , Dina Gafurova c , Dmitry Frolov a a Ioffe Institute, 26 Politekhnicheskaya, St. Petersburg 194021, Russia b Institute of Continuous Media Mechanics, Ural Branch of Russian Academy of Sciences, 1 Academician Korolev Street, Perm 614013, c Russia 3 Lomonosov Moscow State University, 1 Leninskiye Gory, Moscow 119991, Russia Abstract Laboratory investigations of deformation of heterogeneous brittle materials (rocks) by acoustic emission (AE) and X -ray computer microtomography (CT) are presented. The experiments involved loading of cylindrical samples of Westerly granite under the condition of uniaxial compression and recording of AE signals emitted during deformation of samples at different loading-unloading stages. After each unloading of the sample a tomographic survey was performed. Totally, 11 loading-unloading stages and tomographic surveys were carried out. The defect structure evolution is considered in the framework of the concept of self-organized criticality. It has been found that the type of the energy distribution function of AE signals can be used as an indicator of the deformed material state and transition to a critical fracture stage. An exponential function points to a noncritical state of a deformed material, and a pow -law function ind cates that the defect accumul tion has passed to a critical stage. This result is confirmed by X ray microtomographic data. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: acoustic emission; X-ray tomography; defect, energy distribution; prediction Extensive i v stigations in the fi ld of mechanics and physics of the strength of heterogeneous brittle materials carried out during the last 30-40 years have led to a significant progress in understanding the laws governing defect accumulation and formation of fracture nucleation site. Lockner et al. (1992), Petružálek et al. (2013), Hamie et al. ECF22 - Loading and Environmental effects on Structural Integrity Defect Structure of Deformed Heterogeneous Materials: Acoustic Emission and X-Ray Microtomography Ekaterina Damaskinskaya a *, Ivan Panteleev b , Dina Gafurova c , Dmitry Frolov a a Ioffe Institute, 26 P litekhnicheskaya, St. Pet rsburg 194021, Russia b Institute of Continuous Media Mechanics, Ural Branch of Russian Acad my of Sciences, 1 A ademician Korolev Street, Perm 614013, c Russia 3 Lomonosov Moscow State University, 1 Leninskiye Gory, Moscow 119991, Russia Abstract Laboratory investigations of deformation of heterogeneous brittl materials (rocks) by acoustic emission (AE) and X -ray computer micro m graphy (CT) are presente . The experiments involved loa ing of cylindr cal samples of Westerly gr nite der the condition of uni xial compressi n and recording of AE signals emitt d during defor ation f samples at ffere t loading-unloadi g stages. After each unloading of the sample a tomographic survey was p formed. Totally, 11 loading-unloading sta es an tomographic surveys were carried out. The de ect structure evolution is co sidered in the framework of the concept of self- rganized criticality. It has been found that the type of the energy distribution fu ction of AE signals can be used s an indic tor f the deformed mate ial state a d transitio to a critical fracture stage. An xponenti l function points to a noncritica state of a d formed mater al, and a power-law f nction dicates that th defe t accumulation has pas d to a critical stage. This result i confirmed by X ray microtomographic data. © 2018 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: acoustic emission; X-ray tomography; defect, energy distribution; prediction 1. Introduction Extensive investigations in the field of m chanic a d physics of the stre gth of heterog neous brittle materials carried out during the l st 30-40 yea s have led t a ignificant progress in understanding the laws governing d fect accumulation and formation of a fracture nucleation site. Lockner et al. (1992), Petružálek et al. (2013), Hamie et al. © 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 © 2018 Th Authors. Published by Elsevie B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. * Correspon ing author. Tel.: +7-921-754-06-87; fax: +7-812-297-10-17. E-mail address: Kat.Dama@mail.ioffe.ru * Corresponding author. Tel.: +7-921-754-06-87; fax: +7-812-297-10-17. E-mail address: Kat.Dama@mail.ioffe.ru

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.050