PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 1421–1426 Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2016) 000–000 0

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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.2016.06.180 ∗ Corresponding author. Tel.: + 7-382-228-6972; fax: + 7-382-249-2576. E-mail address: kost@ispms.tsc.ru 2452-3216 c 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. The electric explosion of metallic wires is one of the most perspective technologies for the synthesis of parti cles of given composition. As shown by Jonson and Siegel (1970), Bennett (1968), Psakhie (2010) and Abdrashitov (2010) this technology enables the synthesis of composite particles consisting of crystallites of several metallic or non-metallic phases, due to which their properties can change considerably and they can possess required perfor mance characteristics. Dispersion of wires occurs as follows: when a high-density electric pulse (10 6 -10 9 Å / cm 2 ) is sent through a metallic wire, it is rapidly heated, melted and then explodes. The explosion products disperse into gaseous atmosphere with the formation of particles. The explosive technology allows synthesizing a wide range of metal, oxide, nitride and other powders with complex internal structure. In Zol’nikov (2001), Psakhie (1995), Psakhie (1998), Psakhie (2012) it was shown that the internal structure of nanopowders influences their physical, chemical and mechanical properties. It should be noted that the use of the method of particles in its various representations is promising for description of structural and phase transformations, generation of charged clusters, formation of gas phase and dispersion particles under the electric explosion of the wires, i.e. see Shilko (2015), Psakhie (2013), Psakhie (2008). ∗ Corresponding author. Tel.: + 7-382-228-6972; fax: + 7-382-249-2576. E-mail address: kost@ispms.tsc.ru 2452-3216 c 2016 The Authors. Published by Elsevier B.V. e r-review under responsibility of the Scientific Committee of ECF21. ( n m - m n 6 9 2 . m ( e a a i s p ( 8 2 u 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 Molecular Dynamics Simulation Of Electric Pulse Explosion Of Metal Wires K.P. Zolnikov a, ∗ , D.S. Kryzhevich a , E.V. Shilko a , A.V. Korchuganov a a ISPMS SB RAS, 2 / 4, pr. Akademicheskii, Tomsk, 634021, Russia Abstract Molecular dyna ics simul tion of the bicomponent particle formation as a result of imultane us electric explosion of c pper and nickel wires is carried out. The influence of the internal structure of exploding metal wires and the distance between them on the dynamics of their dispersion, the size and phase composition of the formed particles is investigated. It is shown that the basic mechanism of particle synthesis is the agglomeration of smaller clusters, and the minor one is the deposition of atoms from the gas phase on the particle surfaces. The distribution of chemical elements is non-uniform over the cross section of the synthesized particles. The concentration of copper atoms in the subsurface region is higher than in the particle volume. Varying the loading parameters (temperature, distance between the wires) allows controlling the size and phase composition of the synthesized particles. c 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Molecular dynamics; Nanoparticles; Electrical explosion; 1. Introduction The electric explosion of metallic wires is one of the most perspective technologies for the synthesis of parti cles of given composition. As shown by Jonson and Siegel (1970), Bennett (1968), Psakhie (2010) and Abdrashitov (2010) this technology enables the synthesis of composite particles consisting of crystallites of several metallic or non-metallic phases, d e to which the r properties can change considerably and they can possess required perfor mance characteristics. Di persion of wir s oc urs as follows: when a high-density electric pulse (10 6 -10 9 Å / cm 2 ) is sent through a metallic wire, it is rapidly heated, melted and then explodes. The explosion products disperse into gaseous atmosphere with the formation of particles. The explosive technology allows synthesizing a wide range of metal, oxide, nitride and other powders with complex internal structure. In Zol’nikov (2001), Psakhie (1995), Psakhie (1998), Psakhie (2012) it was shown that the internal structure of nanopowders influences their physical, chemical and mechanical properties. It should be noted that the use of the method of particles in its various representations is promising for description of structural and phase transformations, generation of charged clusters, formation of gas phase and dispersion particles under the electric explosion of the wires, i.e. see Shilko (2015), Psakhie (2013), Psakhie (2008). 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Molecular Dynamics Simulation Of Electric Pulse Explosion Of Metal Wires K.P. Zolnikov a, ∗ , D.S. Kryzhevich a , E.V. Shilko a , A.V. Korchuganov a a ISPMS SB RAS, 2 / 4, pr. Akademicheskii, Tomsk, 634021, Russia Abstract Molecular dynamics simulation of the bicomponent particle formation as a result of simultaneous electric explosion of copper and nickel wires is carried out. The influence of the internal structure of exploding metal wires and the distance between them on the dynamics of their dispersion, the size a d phase composition of the f rmed particles is nvestigated. It is shown that the ba ic mechanism of particle synthesis is the agglomeration of smaller clusters, and the minor one is the deposition of atoms from the gas phase on the particle surfaces. The distribution of chemical elements is non-uniform over the cross section of the synthesized particles. The concentration of copper atoms in the subsurface region is higher than in the particle volume. Varying the loading parameters (temperature, distance between the wires) allows controlling the size and phase composition of the synthesized particles. c 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywor s: Molecular dynamics; Nano articles; Electrical explosion; 1. Introduction M e t me e g e p g para s 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/). r-review under responsibility of the Scientific Committe 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