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    Wyświetlanie 1-4 z 4
    Tytuł:
    The Coupled Eulerian-Lagrangian Analysis of the KOBO Extrusion Process
    Autorzy:
    Wójcik, Marta
    Skrzat, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2024076.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    coupled Eulerian-Lagrangian method
    KOBO extrusion
    metal forming
    finite element method
    hardening parameters
    cyclic loading
    metoda sprzężona Eulera-Lagrangiana
    wytłaczanie KOBO
    obróbka plastyczna
    metoda elementów skończonych
    parametry hartowania
    obciążenie cykliczne
    Opis:
    The KOBO extrusion is an unconventional elastic-plastic deformation process in which the phenomenon of chang- ing a path of plastic deformation due to die cyclic oscillations by a given angle and with a given frequency is applied. As the result of the application of the oscillating rotary motion of the die, the reduction of the extrusion force was obtained. The numerical study of the KOBO extrusion of metallic materials was presented in this paper. The three-dimensional coupled Eulerian-Lagrangian (CEL) analysis was applied. The relationship between the extrusion force and the punch displacement during the KOBO process was achieved. The effective plastic strain distribution in the butt was found. The results of the numerical computations were compared with the experimen- tal data. The influence of the material hardening parameters on the cyclic loading phenomena (ratcheting, mean stress relaxation) in terms of the course of the KOBO extrusion was also examined. The proper determination of the material hardening parameters can help to optimize the KOBO process in terms of the reduction the extrusion force and the choice of the amount of die oscillations.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 1; 197-208
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Modeling of Superplastic Punchless Deep Drawing Process of a TI-6AL-4V Titanium Alloy
    Autorzy:
    Skrzat, Andrzej
    Wójcik, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/102089.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    superplastic forming process
    superplasticity
    Ti-6Al-4V titanium alloy
    blow forming
    deep drawing
    viscoplasticity
    superplastyczny proces formowania
    superplastyczność
    stop tytanu Ti-6Al-4V
    rozdmuchiwanie
    głębokie tłoczenie
    lepkość
    Opis:
    The numerical results of superplastic punchless deep drawing of the Ti-6Al-4V titanium alloy were presented in this paper. The material behavior subjected to the forming process was characterized by deformation-microstructure constitutive equations including the grain growth. Superplastic stress-strain characteristics used in the numerical simulations were computed with the application of authorial program. The explicit integration scheme is used in solving differential equations. The numerical simulations of the super-elastic deep drawing were made with finite element method analysis. The von Mises stress distribution in the blow-forming process was obtained. The possible faults of extrusions caused by the improper load history as well as unsuitable pressure were also presented in this paper. The numerical simulations included in this research allow for the proper choice of material and drawing parameters which can help to optimize the superplastic forming process.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 1; 127-136
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Elastic-Plastic Analysis of Polycrystalline Structure Using Crystal Plasticity Modelling – Theory and Benchmark Tests
    Autorzy:
    Wójcik, Marta
    Skrzat, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2204889.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    crystal plasticity
    polycrystalline material
    slip system
    slip system modelling
    plastic deformation
    microstructure
    anisotropy
    Opis:
    Numerical simulations of tension and shear tests for a polycrystalline, anisotropic material were performed using crystal plasticity theory. The slip was considered here as the main mechanism of plastic deformation. Constitutive equations to describe the elastic-plastic deformation caused by the slip are presented. The generation and meshing of various shapes geometries (cubic and paddy shapes) with randomly-orientated grains by means of open source program NEPER program was shown. The Voronoi tessellation was used in order to include morphological properties of a crystalline material. The selected results of elastic-plastic analyses (stress, strain distributions and the macroscopic stress-strain resulting from homogenization) are presented here. The results obtained show the non-uniform distribution of stress and strain for different grains associated with their crystal orientation. The crystal plasticity finite element modelling of materials subjected to plastic deformation is important for microstructure-based mechanical predictions, as well as for the engineering design and to perform simulations involving not only the change of a material’s shape at a macro level but also the phenomena occurring in material in a micro-scale.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 5; 163--177
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled Thermomechanical Eulerian-Lagrangian Analysis of the KOBO Extrusion Process
    Autorzy:
    Wójcik, Marta
    Skrzat, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2134115.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    KOBO extrusion
    Chaboche model
    coupled Eulerian-Lagrangian analysis
    SPD method
    plasticity
    Opis:
    Numerical simulations of the KOBO extrusion process are presented in this paper. The coupled thermomechanical Eulerian-Lagrangian approach was applied for the three-dimensional finite element model. The dynamic explicit Euler forward method was used in numerical calculations. The elastic-plastic Chaboche model assuming isotropic and kinematic hardening under variable temperature conditions was applied to describe the behaviour of the material under cyclic loading. In numerical computations Chaboche material model implemented in commercial software, as well as the proprietary one written as FORTRAN procedure were tested. The numerical results present the stress and strain distributions in the extruded material, as well as an increase of temperature due to the plastic work and friction. The shape of plastic strain zones was verified experimentally. The approach presented in the paper is a promising numerical tool to simulate the KOBO process.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1185--1193
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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