Articles

 


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1.
category: Heat-resistant materials
УДК 621.186.4
Varrik N.M.1
  • [1] Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation
  • Thermal insulation materials for modern planes
    Data on flexible heat-insulating materials for aircraft, their main characteristics and methods of their receiving are provided in the article. Development of sound thermal insulation materials for planes with the lowered specific weight, high operational properties and meeting the requirements of fire safety is one of actual tasks for developers of materials now. Ensuring reliable work of thermal insulation in the conditions of cyclic thermal loadings and vibrations and an opportunity to resist to extreme heatings in ignition cases – an important task during creation of materials for perspective planes. This article presents the review of the types of thermal insulation and methods of increase of its operational properties existing now at the market.
    Keywords: thermal insulation, fire barrier, fire blocking, acoustical insulation mat, heat-resistant fiber.


    2.
    УДК 669.715
    Naumova E.A.1, Nikitin B.K.1, Gromov A.V.1
  • [1] Bauman Moscow State Technical University
  • Investigation of technological and mechanical properties of new casting eutectic aluminum alloys of type "Natural Composites"
    The structure, castability and deformability of some ternary eutectic alloys (Al–Ca–Ni, Al–Ca–Cu, Al–Ca–Fe and Al–Ca–Si) in the as-cast and heat treated states were studied. The ternary eutectics (Al)+Al4Ca+Х (where X – ternary compound) had a much finer structure as compared to the Al–Si eutectic, which suggests a possibility for the creation of the so-called natural composites produced by conventional casting.
    Keywords: Al–Ca–Ni, Al–Ca–Cu, Al–Ca–Fe and Al–Ca–Si phase diagrams, heat treatment, microstructure, castability, hot tearing, deformability.


    3.
    category: Composite materials
    УДК 66.017
    Senatorova O.G.1, Lukina N.Ph.1, Shestov V.V.1
  • [1] Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation
  • Use of glue prepregs in layered hybrid designs on basis aluminum-lithium alloys and SIAL
    It is opportunity to improve weight efficiency by application of laminated skin from hybrid material which consists of high-strength Al–Li alloy sheets and aluminium-glassplastic Laminate SIAL-type. Such materials have high resistance of fatigue crack growth, lower density and high strength in comparison with monolithic materials. The structure and properties of prototype of hybrid wing panel of Tu-204 aircraft were evaluated was produced in commercial conditions, OAO «Voronezh Aircraft JVC» (VASO). Standard samples were used for tensile, compression low fatigue tests and for determination of FGGR (dl/dN). Hybrid laminated materials are recommended to use for lower and upper wing panels, as a result of the structural components: adhesive prepregs, reinforced glassfibers and Al–Li alloy sheets.
    Keywords: hybrid laminated material, wing panel, skin, stringer, Al–Li alloy, adhesive prepreg, SIAL.


    4.
    category: Structural metallic materials
    УДК 669.02/.09
    Galkin V.I.1, Evseev P.S.1, Galkin E.V.1
  • [1] Moscow Aviation Institute (National Research University)
  • New method for obtaining sheet metallic materials, reinforced by particles
    The new method of producing a sheet metal – reinforced multicyclic particles via rolling. For example alumomednogo developed composite rolling process based on the use of criteria-based approach and the numerical methods of calculation
    Keywords: сomposite sheet, reinforced with particles, multicyclic rolling, criterial approach, the degree of deformation, alyumomedny composite, mathematical modeling.


    5.
    category: Testing of materials and structures
    УДК 620.178
    Semenychev V.V.1, Panarin A.V.1
  • [1] Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation
  • Application of sclerometry for more informativeness measured characteristics of chromium and nickel coatings
    On 12H18N9T steel samples was deposited chromium and nickel coatings thickness 20–25 μm, wherein the used standard electrolytes & electrolytes containing nanoscale particles. The measured values of coatings microhardness showed, that this value considerably depends on in which electrolyte was formed this or another coating. With loads 50 and 70 N were applied scratches by diamond indenter from developed sclerometer on samples with different types of galvanic coatings. These grooves investigated by microscopic methods, evaluated the width, depth and morphology of the bottom & banks of scratches. It’s found, that the geometric parameters of the grooves depend on composition of used electrolytes. So, standard chromium coating characterized by maximum width & depth of the grooves in contrast to chromium coatings formed in cluster electrolytes, where this parameters have the smaller values. At the bottom of the grooves on standard nickel coating found a cracks perpendicular to the grooves
    Keywords: sclerometry, galvanic functional coatings, metallography, groove geometry analysis, microhardness.


    6.
    УДК 669.715:621.785
    Ber L.B.1
    TTT (temperature–time–transformation) and TTP (temperature–time–property) diagrams for aging of heat treatment strengthenable aluminum alloys. Their use for the development of step aging regimes
    There were considered the isothermal TTT (temperature–time–transformation) and TTP (temperature–time–property) aging diagrams for Al–Cu, Al–Cu–Mg, Al–Zn–Mg–(Cu), Al–Mg–Si–(Cu) system heat treatment strengthenable aluminum alloys. The use of optimal step aging regime instead of single-step regime is effective for improving the complex of properties or to accelerate the aging. The optimum phase composition of hardening precipitates was determined with using the TTT and TTP aging diagrams. The regimes for first low temperature aging step (LA), at which for second high temperature aging step (HA) the disperse hardening precipitates that have arisen in the volume of grain at the first aging step will inherit the disperse hardening precipitates, forming at the second aging step. The recovery at the HA step is not necessary, which facilitates the commercial application of these aging regimes. Examples of the effective step aging regimes for the aluminum alloys of different alloying systems we
    Keywords: heat treatment strengthenable aluminum alloys, TTT (temperature–time–transformation) aging diagrams, TTP (temperature–time–property) aging diagrams, step aging regimes.


    7.
    category: Testing of materials and structures
    УДК 621.983.7
    Shishkin A.A.1
  • [1] Research and Development Production Enterprise «Zvezda» Join-Stock Company named after academician G.I. Severin
  • Researching of the extreme performance of the reduction of thin-walled tubular billets in the production of pressure vessels
    The extreme performance of the reduction of tubular billets by axial force in a rigid die is theoretically and experimentally researched. It is established that the cause of circumferential loss of stability is the heterogeneity of the properties of materials. The mathematical models, giving the possibility to calculate stress-strain state and maximal reduction ratios, are presented. The calculations were experimentally verified. Abnormal limiting factors of reduction with local heating, such as softening of the force transmission zone and jamming of the edge, were defined.
    Keywords: reduction of tubes, thin-walled billet, loss of stability, forming with heating, isothermal stamping.


    8.
    category: Structural metallic materials
    УДК 621.7
    Galkin V.I.1, Golovkina M.G.1
  • [1] Moscow Aviation Institute (National Research University)
  • Forecasting of mechanical properties distribution by volume of articles, obtained by the method of hot deformation with the use of CAE-systems
    Prediction of distribution of mechanical properties on the volume of the products received by methods of hot deformation with use of CAE-systems. In this work the technique of research of influence of parameters of deformation process on distribution of mechanical properties of products of aluminum alloys is presented. Functional dependences of mechanical characteristics on intensity of deformation, temperature and speed of cooling are received. The software application for SAE-systems which allows to predict mechanical properties of products from aluminum alloys is created.
    Keywords: aluminum alloys, mechanical properties, prediction, СAE-system.


    9.
    category: Composite materials
    УДК 666-426:669.018.45
    Zimichev A.M.1, Varrik N.M.1, Sumin V.A.1
  • [1] Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials State Research Center of the Russian Federation
  • To the question of receiving ceramic threads on the basis of high-melting oxides
    Ceramic fibers are currently a priority object for development as the main component for the heatproof and heat-insulating materials with high temperature applications. Continuous oxide fibers are using for producing textiles: yarns, ribbons, fabrics for thermal protection and insulation of cables, braid thermocouples, fire-resistant screens. In this paper it was investigated the features of the process of obtaining twisted yarns of high-temperature fibers based on aluminum oxide. The influence of such parameters as the viscosity of the fibre-forming solution, the speed of fiber drawing, thermal treatment mode, the performance properties of ceramic filaments has been studied.
    Keywords: refractory oxide, high temperature insulation, ceramic threads.