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Bykov D.L.,Moscow State University | Martynova E.D.,Moscow State University | Mel'nikov V.P.,Federal Center for Dual Use Technologies Soyuz
Mechanics of Solids | Year: 2015

A method for describing the creep behavior until fracture of a highly filled polymer material previously damaged in preliminary tests is proposed. The constitutive relations are the relations of nonlinear endochronic theory of aging viscoelastic materials (NETAVEM) [1]. The numerical-graphical method for identifying the functions occurring in NETAVEM, which was proposed in [2] for describing loading processes at a constant strain rate, is used here for the first time in creep theory. We use the results of experiments with undamaged and preliminary damaged specimens under the action of the same constant tensile loads. The creep kernel is determined in experiments with an undamaged specimen. The reduced time function contained in NETAVEM is determined from the position of points corresponding to the same values of strain on the creep curves of the damaged and undamaged specimens. An integral equation is solved to obtain the aging function, and then the viscosity function is determined. The knowledge of all functions contained in the constitutive relations permits solving the creep problem for products manufactured from a highly filled polymer material. © 2015, Allerton Press, Inc.

Sinditskii V.P.,Mendeleev University of Chemical Technology | Filatov S.A.,Mendeleev University of Chemical Technology | Kolesov V.I.,Mendeleev University of Chemical Technology | Kapranov K.O.,Mendeleev University of Chemical Technology | And 4 more authors.
Thermochimica Acta | Year: 2015

Abstract The physico-chemical characterization (thermal decomposition under non- and isothermal conditions, enthalpy of formation, burning behavior and flame structure) of a new explosive dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate is detailed. Combustion studies have shown that TKX-50 burns slightly faster than HMX and approaches the burning rate of CL-20. The combustion of TKX-50 has been shown to obey mechanism with the leading reaction in the condensed phase. The rates of TKX-50 decomposition in both solid and liquid phases proved to be slightly higher than the corresponding rates of decomposition of RDX. Decomposition of TKX-50 is determined by decomposition of free hydroxylamine formed in the reaction of dissociation of the salt. An intermediate decomposition product is ammonium salt of 5,5′-bis(2-hydroxytetrazole), which further decomposes in the second stage at elevated temperatures. The enthalpy of formation of TKX-50 has been measured with the help of bomb calorimetry, however the resulting value is quite different from the enthalpy reported earlier. © 2015 Elsevier B.V.

Aldoshin S.M.,RAS Institute of Problems of Chemical Physics | Aliev Z.G.,RAS Institute of Problems of Chemical Physics | Goncharov T.K.,RAS Institute of Problems of Chemical Physics | Milyokhin Y.M.,Federal Center for Dual Use Technologies Soyuz | And 5 more authors.
Journal of Structural Chemistry | Year: 2014

The crystal structure of the bimolecular crystal of CL-20 with new promising highly energetic compound 7H-tris-1,2,5-oxadiazolo[3,4-b:3′, 4′-d:3″,4″-f] azepine is obtained and studied. © 2014 Pleiades Publishing, Ltd.

Aldoshin S.M.,RAS Institute of Problems of Chemical Physics | Aliev Z.G.,RAS Institute of Problems of Chemical Physics | Goncharov T.K.,RAS Institute of Problems of Chemical Physics | Kazakov A.I.,RAS Institute of Problems of Chemical Physics | And 3 more authors.
Russian Chemical Bulletin | Year: 2013

Crystals containing 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12- hexaazaisowurtzitane and tri- nitrotoluene molecules in a 1 : 1 ratio were obtained. The crystal structure was determined, and DSC thermograms, thermal stability, and the standard enthalpy of formation were investigated. An analysis of the crystal structure shows that interactions between the oxygen and nitrogen atoms of the nitro groups ON=O...NO2 of adjacent molecules are among the structure-forming intermolecular interactions in the crystals of polynitroamine compounds. © 2013 Springer Science+Business Media, Inc.

Sadovnichii D.N.,Federal Center for Dual Use Technologies Soyuz | Markov M.B.,RAS Keldysh Institute of Applied Mathematics | Vorontsov A.S.,RAS Keldysh Institute of Applied Mathematics | Milekhin Yu.M.,Federal Center for Dual Use Technologies Soyuz
Combustion, Explosion and Shock Waves | Year: 2012

The main specific features of propagation of an electromagnetic pulse in a solid-propellant energetic system are studied by means of the numerical solution of three-dimensional Maxwell equations. A case with the electric field vector in the pulse being directed parallel to the structure centerline is considered. The effect of the solid propellant properties on specific features of the formation of electric fields inside the solid-propellant energetic system and in the ambient space is demonstrated. © 2012 Pleiades Publishing, Ltd.

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