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 Struc ural Integrity 2 (2016) 1936–1943 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 Scaling laws of structure and fragmentation parameters of ZrO 2 ceramics. Marina Davydova a *, Sergey Uvarov a a Institute of Continuous Media Mechanics UB RAS, 1, Ac. Korolev str., Perm 614013, Russia Abstract The effects of loading intensity and material structure on statistical regularities of fragmentation were studied. The material under investigation is zirconia-based ceramics. The samples with different pore structure (10%, 20%, 30%, 45%, 60% - the porosity of the powder used for ceramic sample sintering) were tested. The experimental data on dynamical fragmenta i n of ZrO 2 ceramics allowed s t construct th fr gm nt size distribution (spatial scaling) and the distribution of time interval between fractoluminiscense pulses (time scaling). The power law exponent of spatial scaling depends on ceramics porosity and intensity of loading, which has a considerable influence on the power law exponent for samples with highest porosity (60%). Two types of the distribution function for time interval were observed. For ceramics of low porosity (less than 60%) the distribution is fitted by two power laws with different exponents, and the distribution of time intervals for ceramics of highest porosity (60%) obeys one power law. An increase in porosity leads to the growth of the number of single fracture events (the number of middle and sh rt intervals), as a consequence of missing the second power law exponent. Statistics of pore systems in two sampl s w th 20% and 60% porosity was studied using X- ay Computed Tomography (CT). Analyzing more than a thousand of cr ss section images for every s mple, w get a cumulative pore area dist ibution, and a relationship between area and perimeter. The best fitting for pore area distribution are: 1) two power laws for sample with highest porosity (60%); 2) double exponential law for low porosity (20%). The area – perimeter relation satisfies a power law. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Scaling laws of structure and fragmentation parameters of ZrO 2 ceramics. Marina Davydova a *, Sergey Uvarov a a Institute of Continuous Media Mechanics UB RAS, 1, Ac. Korolev str., Perm 614013, Russia Abstract The effects of loading intensity and material structure on statistical regularities of fragmentation were studied. The material under investigation is zirconi -based ceramics. The samples with different pore structure (10%, 20%, 30%, 45%, 60% - the por sity of the powd r us d for cera ic sample sintering) were tested. The experimental data n dynamical fragmentation of ZrO 2 ceramics allowed us to construct the fragment size distribution (spatial scaling) and the distribution of time interval between fract luminiscense pulses (time scaling). The power law exponent of spatial scaling depends on ceramics p rosity and intensity of loading, which has a considerable influence on the power law exponent for samples with highest porosity (60%). Two types of the distribution function for time interval were observed. For ceramics of low porosity (less than 60%) the distribution is fitted by two power laws with different exponents, and the distribution of time intervals for ceramics of high st porosity (60%) obeys one power law. An increase in porosity leads to the growth of the number of single fracture events (the number of middle nd short interval ), as a consequence of missing the secon power law exponent. Statistics of pore syste s in tw samples ith 20% 60% porosity was studied using X-ray Computed Tom graphy (CT). Analyzing ore than t ousan of cross section im ges for v ry s pl , we get a cumul ve po area distr bution, and a relationshi between area and perimeter. The best fitting for pore area distribution are: 1) two power laws for sample with highest porosity (60%); 2) double exponential law for low porosity (20%). The area – perimeter relation satisfies a power law. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Copyright © 2016 The Authors. Published by Els vier B V. This is an open access article under the CC BY-NC-ND license (http://c ativecommon .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 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. * Corresponding author. Tel.: +7-342-237-8312; fax: +7-342-237-8487. E mail address: davydova@icmm.ru * Corresponding author. Tel.: +7-342-237-8312; fax: +7-342-237-8487. E-mail address: davydova@icmm.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.2016.06.243