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Author: Raab A. G.

  • TECHNOLOGIES

    Virtual evaluation of the influence of independent factors on the force deformation when receiving long-length product from low-alloyed chrome bronze by the SPD method «Conform»

    • Semenov V.I.
    • Raab A.G.
    • Tontchev N.T.
    • Kamburov V.V.
    Machines. Technologies. Materials., Vol. 13 (2019), Issue 8, pg(s) 335-337
    • Abstract
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    •  Article PDF

    Using computer simulat ion in the environment of the DEFORM-3D appl icat ion package, a virtual ful l factorial experiment was conducted on the process of producing long length workpieces from low -al loyed chrome bronze by equal channel angular pressing (ECAP) using the Conform scheme. During the virtual experiment, an assessment was made of the inf luence of independent factors (impel ler rotat ion speed, number of cycles, and temperature of deformat ion treatment) on the response parameter — deformat ion force. As a resul t of the experiment , a regression equat ion was obtained, a variant of solving the opt imizat ion problem wi th determining the numerical values of the accepted independent factors was presented, an d their inf luence on the response parameter was analyzed.

  • TECHNOLOGIES

    SELECTING THE OPTIMUM VARIANT OF THE SHEAR DRAWING PROCESS FOR LOW-CARBON STEEL

    • Tontchev N.
    • Semenov V. I.
    • Raab A. G.
    • Kamburov V.
    Machines. Technologies. Materials., Vol. 11 (2017), Issue 3, pg(s) 121-122
    • Abstract
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    With the help of computer simulation in the DEFORM-3D software, there was performed a virtual full factorial experiment of the process of shear drawing. In the course of the experiment, the effect of independent parameters (drawing speed, die rotation rate, die angle and friction factor) on the strain intensity was evaluated. As a result of the experiment, a regression equation was derived and the most significant individual factors and their combinations, influencing the response parameters, were determined. Also, comparative results were presented for the processes of regular drawing and shear drawing. It was demonstrated that the process of shear drawing has a higher efficiency from the point of view of strain intensity.

  • SCHEME OF TREATMENT AND ITS EFFECT ON THE STRAIN HETEROGENEITY AND STRUCTURAL CHANGES IN BILLETS OF LOW-CARBON STEEL

    • Semenov V.I.
    • Aleshin G. A.
    • Raab A. G.
    • Tontchev N.
    • Kamburov V.
    • Yankov E.
    Materials Science. Non-Equilibrium Phase Transformations., Vol. 3 (2017), Issue 3, pg(s) 87-91
    • Abstract
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    The paper presents the results of numerical modeling of the conventional drawing and free torsion processes of rods made of low-carbon steel using the "DEFORM-3D" software package. The heterogeneity of the strain intensity distribution in the investigated processes revealed in the model basically corresponds to real physical experiments with similar parameters of the structural heterogeneity. A mutual correspondence of the ductility diagram to the character of the structural changes in the samples deformed by free torsion is established, and the limiting values of the ductility margin, the excess of which leads to the development of fracture processes.

  • COMBINED AND CONSECUTIVE SPD PROCESSING TECHNIQUES

    • Raab G. I.
    • Raab A. G.
    • Asfandiyarov R. N.
    • Fakhretdinova E. I.
    Materials Science. Non-Equilibrium Phase Transformations., Vol. 3 (2017), Issue 1, pg(s) 10-11
    • Abstract
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    This work presents the analysis of the stress-strained state of billets processed by such SPD processing techniques as "ECAP-Conform", "drawing with shear" and "rotary forging" with a special geometry of anvils. We analyze the influence of processing by these SPD techniques, as well as by their combination with conventional metal working methods, on the structure formation and enhancement of properties in Al and Cu-based alloys, as well as in low-carbon steel. We demonstrate the critical role of the induced non-monotonous deformation in the formation of a combination of enhanced physical and mechanical properties in the investigated metallic materials during treatment by combined and consecutive SPD techniques.

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