Abstract. The report is focused on determination of the material parameters from experimental data, which will be used as input data to computational modeling of radial tires for passenger vehicles. It is necessary to have knowledge about the geometry, material parameters, cross-section and structure of tire casing (number of layers of the belt and carcass, information about the bead and cap ply) for creation of computational models of tire casing for stress-strain analysis of a tire under vertical load, modal analysis etc. The tire casing parts in computational models are partially replaced with material and geometrical parameters with specified stiffness. The Finite Element Method using the program system ANSYS is applied to the computational modeling. The experiments of total tires are needed for verification analyses between computational results and experimental data. The experiments of parts of the tire casing such as parts of tread and next rubber parts of tire are needed for determination of the parameters of constitutive models of rubber elasticity such as the parameters of hyperelastic Mooney-Rivlin model. The report describes the result for two tires 165/65 R13 and 215/40 R17 as samples. The structures of the tire-crown with geometrical and material parameters are presented. The authors used orthotropic material parameters for determination of the structure parts of tire as the steel-cord belt. The values of modules of elasticity and Poisson ratios are presented for 165/65 R13. The orthotropic material parameters for definition of the tire-crown of 215/40 R17 are determined as input data to the computational model of tire.

IntroductionThe paper deals with the specific composites with elastomer matrix and steel cord reinforcement. These composites are typical for a tire-casing for transport means. The experiments of tires are needed for verification analyses between computations and test data. The paper is oriented on static experiments on a special test machine for tires -static adhesor.

In this contribution, the composites with textile fibre (cord) and an elastomer matrix are studied based on computational modeling of car tires in combination with experiments. These composite are applied in tire casings for cars, conveyor belts etc. The aim of this research work of authors is creation of computational models namely for stress-strain analyses of selected parts of radial tire casing. The typically passenger car radial tire casing consists of one or two polyester plies in tire carcass and two steel-cord belts and one polyamide 66 cap ply below tread. The finite element method using the program system ANSYS is applied to the computational modeling. For the determination of the material parameters of elastomer and textile cords as input data to the computational models, it was necessary to perform tests as statically tensile tests. Also the experiments of composites as tests of low cyclic loading of composites are needed for verification analyses between computational results and experimental data. For computational modeling, the modulus of elasticity and Poisson ratio are used as material input parameters of textile reinforcements. The results from the computational modeling and selected results from the tests are presented in this contribution.

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The article deals with author’s software products review to calculate devices with highly turbulized flows as a part of granulation units. Principal scheme and model of the granulation unit, algorithm of the granulation technical calculation are represented in the work. The complex automated calculation technique of the granulation units is proposed. The proprietary software for calculation of main stages in the granulation process is observed in the research. Short description and functions of main software products to implement basic algorithm are given: Vortex Flow©, Conical Channel©, Conical Granulator©, Multistage Heat Treatment©, Vortex Tray©. As a result of the optimization calculation, the user of programs will get the following information: optimal construction of the vortex granulator’s workspace, necessary number of stages in the multistage shelf drier for granules’ final drying, number and construction of the vortex tray with heat and mass transfer-separation elements for exhaust gases cleaning. All software products enable to export the received data and to exchange these data between each other. The complex algorithm and software products, proposed in the article, let to carry out optimization calculation of the main technological equipment in the granulation unit at its designing stage without expensive multifactorial experiment. The presented granulation units’ calculation algorithm and software products for its realization enable to carry out equipment changeover if raw material characteristics and the productivity of the unit are changed. The automated calculations results give a base to design industrial granulation unit for porous ammonium nitrate production.