PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1971–1976 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. ECF22 - Loading and Environmental effects on Structural Integrity Effect of high-power nanosecond electromagnetic pulses on the structural, chemical, and technological properties of natural dielectric minerals Igor Bunin*, Mariya Ry zantseva, Nataliya Anashkina Mel’nikov Institute for the Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, IPKON RAN, 4, Kryukovsky Tupik, Moscow, 111020, Russia Abstract We studied the mechanism of the structural surface modification, and the subsequent changes of microhardness, physical chemical and technological properties of calcium-bearing minerals (calcite, scheelite, and fluorite) and rock-forming minerals of diamond bearing kimberlites (olivine and serpentine) under the non-thermal effect of high-voltage nanosecond pulses. X-ray photoelectron spectroscopy (XPS), infrared Fourier spectroscopy (FTIR), analytical scanning electron microscopy (SEM–EDX), atomic force microscopy, microhardness measurements (Vickers hardness test, HV), electrophoretic light scattering experiments ( ζ -potential), and other methods were employed to examine the structural, chemical, electrical, mechanical and physicochemical changes in the surface properties of natural dielectric minerals as a result of pulsed energy impacts. According to XPS, DRIFTS, SEM-EDX and microhardness testing data, the effect of high-voltage nanosecond pulses leads to damage the surface microstructure of geomaterials with the subsequent formation of traces of surface breakdowns and microcracks, softening of Ca-bearing minerals and rock-forming minerals of kimberlites, and reducing their microhardness by 40–67% overall. Using the adsorption of Hammett indicators from aqueous media, it has been an established fact that the acceptor properties of calcite and scheelite surfaces grow and the electron donor ability of fluorite increases as a result of pulsed electric field treatment during the first 30 s. Preliminary electromagnetic pulse treatment generally enhances Ca-bearing mineral flotation activity by 5–12%. ECF22 - Loading and Environmental effects on Structural Integrity Effect of high-power nanosecond electromagnetic pulses on the structural, chemical, and technological properties of natural dielectric minerals Igor Bunin*, Mariya Ryazantseva, Nataliya Anashkina Mel’nikov Institute for the Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, IPKON RAN, 4, Kryukovsky Tupik, Moscow, 111020, Russia Abstract We studied the mecha ism of t e structural surface modification, and the subsequent change f microhardness, physical chemical and technological properties of calci m-bearing minerals (calcite, scheelite, and fluorite) and rock-forming mineral of diamond bearing kimberlites ( livine and serpentin ) u der th non-thermal eff ct of high-voltage nanose ond pulses. X-ray photoelectron spectroscopy (XPS), infrared Fourier spectroscopy (FTIR), analytical scanning electron micros py (SEM–EDX), at mic force microscopy, microhardness measur ments (Vi kers hardness test, HV), electrophoretic light scattering experiments ( ζ -potential), and ther methods were mployed to examine th structural, chemical, electrical, m chanical and physicochemical changes in the surface properties of natural dielectric minerals as a result of pulsed energy impacts. According to XPS, DRIFTS, SEM-EDX and microhardness t ting data, the ffect of high-voltage nanosecond pulses leads to damage the surface microstructure of geomaterials with t e subsequent formation of traces of surface breakdowns and microcracks, softening of Ca-bearing minerals and rock-forming minerals of kimberlites, nd reducing their mi rohardness by 40–67% overall. Using the adsorption of Hammett indicators from aqu ous media, it has bee an established fact that the acceptor properties of calcite and scheelite surfaces grow an the electron donor ability of fluorite increases as a result of pulsed electric field treatment during the first 30 s. Preliminary electromagnetic pulse treatment generally enh nces C -b aring mineral flotation activity by 5–12%. © 2018 The Authors. Published by Els vier B.V. Peer-review under responsibility of the ECF22 organizers. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: High-voltage nan second pulses; natural minerals; dielectics; softening; microhardnes; structural and chemical properties; surface Keywords: High-voltage nanosecond pulses; natural minerals; dielectics; softening; microhardnes; structural and chemical properties; surface

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +7-10-495-360-73-28; fax: +7-10-495-360-89-60. E-mail address: bunin_i@mail.ru * Corresponding author. Tel.: +7-10-495-360-73-28; fax: +7-10-495-360-89-60. E-mail ad ress: bunin_i@mail.ru

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 o ganizers.

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.2018.12.221