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    Wyświetlanie 1-4 z 4
    Tytuł:
    Quantitative analysis of reinforcing phase in AlSi11/CrFe30C8 composite castings
    Autorzy:
    Dulęba, A.
    Scelina, D.
    Cholewa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380622.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite casting
    alloy segregation
    electromagnetic field
    odlew kompozytowy
    segregacja stopu
    pole elektromagnetyczne
    Opis:
    In this paper assessment of the morphology and segregation of the reinforcing phase based on optical quantitative analysis was achieved. Microscopic observation of AlSi11/CrFe30C8 composite gravity castings was carried out in electromagnetic field. The purpose of investigation was the analysis of current frequency influence supplying the inductor of electromagnetic field on segregation, quantity and morphology of reinforcement phase in aluminum matrix composite. Technological conception of investigations was based on assumption that chromium-iron matrix of particles dissolved in aluminum composite matrix and carbide phases became actual reinforcement of the composite. Gravity segregation was analyzed. Graphs containing distribution of reinforcing phase in metal matrix were shown.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 49-56
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the forced movement of components on the structure in fabricated AlSi/CrxCy composite castings
    Autorzy:
    Dulęba, A.
    Cholewa, M.
    Scelina, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/382394.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dyfuzja
    kompozyty
    faza umacniająca
    diffusion
    composites
    reinforcing phase
    Opis:
    Fabrication and microstructure of the AlSi11 matrix composite containing 10 % volume fraction of CrFe30C8 particles were presented in this paper. Composite suspension was manufactured by using mechanical stirring. During stirring process the temperature of liquid metal, time of mixing and rotational speed of mixer were fixed. After stirring process composite suspension was gravity cast into shell mould. The composites were cast, applying simultaneously an electromagnetic field. The aim of the present study was to determine the effect of changes in the frequency of the current power inductor on the morphology of the reinforcing phase in the aluminum matrix. The concept is based on the assumption that a chromium-iron matrix of CrFe30C8 particles dissolves and residual carbide phases will substantially strengthen the composite. The microstructure and interface structure of the AlSi11/CrFe30C8 composite has been studied by optical microscopy, scanning microscopy and X-ray diffraction.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1; 25-32
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A fast evaluation of initial configurations in repeatable inverse kinematics for redundant manipulators
    Autorzy:
    Duleba, I.
    Karcz-Duleba, I.
    Mielczarek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/329751.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    robot manipulator
    repeatable inverse kinematics
    initial configuration
    manipulator robotyczny
    kinematyka odwrotna
    konfiguracja początkowa
    Opis:
    A repeatable inverse kinematic task in robot manipulators consists in finding a loop (cyclic trajectory) in a configuration space, which corresponds to a given loop in a task space. In the robotic literature, an entry configuration to the trajectory is fixed and given by a user. In this paper the assumption is released and a new, indirect method is introduced to find entry configurations generating short trajectories. The method avoids a computationally expensive evaluation of (infinite) many entry configurations for redundant manipulators (for each of them, repeatable inverse kinematics should be run). Some fast-to-compute functions are proposed to evaluate entry configurations and their correlations with resulting lengths of trajectories are computed. It appears that only an original function, based on characteristics of a manipulability subellipsoid, properly distinguishes entry configurations that generate short trajectories. This function can be used either to choose one from a few possible entry configurations or as an optimized function to compute the best initial configuration.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2018, 28, 3; 483-492
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water absorption of thermoplastic matrix composites with polyamide 6
    Autorzy:
    Krzyżak, A.
    Gąska, J.
    Duleba, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/359210.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    thermoplastic composites
    absorption
    humidity
    polyamide 6
    Opis:
    This paper describes the process of drying of thermoplastic composites warp knows polyamide 6, an engineering polymer material. The results of absorption measurements of pure and polyamide 6 reinforced with cut glass fiber. Composite for injection molding processing conditioned in conditions similar to those prevailing in industrial warehouses and exposed to direct contact with water. Both, in one and in the secondo case of modified natural polyamide 6 cut glass fiber polymer material reduces the susceptibility to moisture absorption. Being the most important for the moisture content in the material has the first 10 hours of exposure of granules to various weather conditions.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 33 (105); 62-68
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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