Перегляд за Автор "Romashov, Yu. V."
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Документ Approximate estimates about impact the processes and its parameters on temperature state of the ceramic nuclear fuel in the cylundrical fuel rods of nuclear reactors(Лідер, 2019) Romashov, Yu. V.; Chibisov, D. O.Документ Approximate estimates for the nonlinear stationary radial heat conduction in the ceramical nuclear fuel pellets(Національний технічний університет "Харківський політехнічний інститут", 2020) Romashov, Yu. V.; Chibisov, D. O.Документ Assessments of opportunities of numerical methods of grids for solving the time-dependent thermal conduction problems of ceramic nuclear fuel(NTU "KhPI", 2018) Yefimov, A. V.; Romashov, Yu. V.; Yesypenko, T. A.; Chibisov, D. O.Документ Assessments the durability indexes of the cladding of the cylindrical nuclear fuel elements of nuclear reactors considering with the uncertainty of the operating temperature(Лідер, 2019) Romashov, Yu. V.; Povolotskii, E. V.Документ Edge fixing effect on the life of a vacuum chamber thin spherical cover subjected to creep damage(Kluwer Academic/Plenum Publishers, 2011) Morachkovskii, O. K.; Romashov, Yu. V.Within framework of the numerical studies of creep resource of a thin spherical cover of a vacuum chamber, we present mathematical formulation and the calculation method for the solution of the initial boundary value problems of the creep theory of thin shells with account of the damage accumulation process of the material. The effect of edge fixing along the normal and tangential lines to the median surface, as well as angular edge fixings, on the cover life in creep are studied under atmospheric pressure creep conditions. The calculation data obtained made it possible to determine the dependence between the cover life in creep and its edge fixing conditions: this effect is strong by the latent fracture time and weak by the allowable deflection valuesДокумент The method of R-functions in the solution of elastic problems on the basis of reissner`s mixed variational principle(Plenum Publishing Corporation, 2002) Morachkovskii, O. K.; Romashov, Yu. V.; Salo, V. A.A method is presented for solving boundary-value elastic problems on the basis of the variational–structural method of R-functions and Reissner’s mixed variational principle. A mathematical formulation is given to problems on the deformation of elastic bodies under mixed boundary conditions and bodies interacting with smooth rigid dies. Solutions satisfying all the boundary conditions are proposed. For undetermined components of these solutions, the resolving equations are derived and their properties are studied. A posteriori estimation of numerical solutions is made. As examples, solutions are found to a problem on the stress–strain state of a short cylinder and to a contact problem on a cylinder interacting with a smooth die. A numerical method of solving such problems is analyzed for convergence, and the accuracy of the solutions is estimated.Документ Perspectives of using the micro-and nano-composite structures to made the cladding of fuel rods for nuclear reactors(Національний технічний університет "Харківський політехнічний інститут", 2020) Romashov, Yu. V.; Povolotskii, E. V.Документ Prediction of the corrosion cracking of structures under the conditions of high-temperature creep(Springer US, 2011) Morachkovskii, O. K.; Romashov, Yu. V.On the basis of the continual model of corrosion crack growth proposed earlier and the well-known incremental-type creep theory, we make an attempt to predict the corrosion cracking of structures under the conditions of high-temperature creep. We propose the mathematical statement of the problem taking into account the influence on corrosion cracking of the properties of corrosive media and the redistribution of stresses in time caused by creep. The Bubnov–Galerkin method is applied for the solution of this problem. An example of prediction of the phenomenon of corrosion cracking in the case of creep of a pipe under the action of internal pressure is analyzedДокумент Using the finite differences for assessment the fundamental frequencies of the thick-wall cladding of cylindrical fuel rods of nuclear reactors(Лідер, 2019) Romashov, Yu. V.; Mazurenko, Yu. V.Документ Using the finite differences method for estimation of buckling under longitudinal compression of cladding of fuel rods of nuclear reactors(Національний технічний університет "Харківський політехнічний інститут", 2020) Romashov, Yu. V.; Mazurenko, Yu. E.