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Wyszukujesz frazę "geometry of the surface" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Geometry of remeltings and efficiency of the surface remelting process applied to cobalt alloy castings
    Autorzy:
    Mróz, M.
    Orłowicz, W.
    Tupaj, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381741.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MAR-M509 alloy
    surface remelting
    remelting geometry
    thermal efficiency
    melting efficiency
    stop MAR M509
    przetapianie powierzchniowe
    geometria przetopienia
    sprawność cieplna
    efektywność topienia
    Opis:
    The paper summarises results of measurements of remelting area geometry, thermal efficiency and melting efficiency characterising the surface remelting process applied to castings of MAR-M-509 cobalt alloy. The remelting process was carried out with the use of GTAW (Gas Tungsten Arc Welding) method in protective atmosphere of helium, at the electric current intensity in the range from 100 A to 300 A, and the electric arc scanning velocity vs in the range from 200 mm/min to 800 mm/min. The effect of current intensity and electric arc scanning velocity on geometrical parameters of remeltings, thermal efficiency, and melting efficiency characterising the remelting process has been determined.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 95-98
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Modification of the Front Surface Geometry of the RFSSW Tool Sleeve on the Plasticization Effect and Stirring Materials During Joining Sheets Made of Aluminum Alloy 2024
    Autorzy:
    Łogin, Waldemar
    Śliwa, Romana E.
    Ostrowski, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/2174597.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    RFSSW
    RFSSW tools
    joint strength
    material mixing
    Opis:
    The paper presents the results of research and analysis of the effect of joining by the RFSSW method of alclad sheets made of Al2024 with an anodic oxide coating, with the using the tool with modified geometry of the front surface of inner sleeve. The different effects of the modifications made on the phenomenon of plasticization and stirring of materials in the process of creating a weld, microstructure of welds and mechanical strength of lap joints were shown. The tests were carried out on 1.27 mm thick sheets, with the use of an unmodified tool and modified tools with three variants of the geometry. The welds and the joints samples were subjected to metallographic and strength tests. It has been shown that the use of a properly selected modified geometry has a beneficial effect on the transport of materials to be joined in the joint zone (flow pattern of plasticized layers and the stirring effect) during the welding, which translates into the strength of the joints and the nature of the weld failure.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1435--1442
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Impact of Selected Geometry Parameter of Titanium Spatial Insert on the Surface Layer Formation on Grey Cast Iron
    Autorzy:
    Dziwoki, G.
    Dulska, A.
    Szajnar, J.
    Król, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379470.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grey cast iron
    Titanium
    Carbides
    layered casting
    insert
    żeliwo szare
    tytan
    węgliki
    odlewanie warstwowe
    Opis:
    The paper presents a method of producing a grey cast iron casting locally reinforced with a titanium insert printed using SLM method (Selective Laser Melting). This article attempts to examine the impact of the selected geometry of titanium spatial insert on the surface layer formation on grey cast iron. The scope of the research focuses on metallographic examination - observation and analysis of the structure of the reinforced surface layer on a light and scanning microscope and a hardness measurement of the titanium layer area. Based on the obtained results, it was concluded that the reaction between titanium insert and metal (grey cast iron) locally develops numerous carbides precipitation (mainly TiC particles), which increases the hardness of the reinforced surface layer and local strengthening of the material. The ratio between the thickness of the support part (grey cast iron) and the working part (titanium insert) affects the resulting layers connection structure. The properties of the obtained reinforced surface layer depend mainly on the geometry of the insert (primarily on the internal dimensions of the connector) and the volume of the casting affecting the re-melting of the insert. A more concentrated structure of carbides precipitation occurs in castings with a full connector insert.
    Źródło:
    Archives of Foundry Engineering; 2019, 1; 58-62
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in the extent and geometry of the Scott Glacier, Spitsbergen
    Autorzy:
    Zagórski, Piotr
    Siwek, Krzysztof
    Gluza, Andrzej
    Bartoszewski, Stefan A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2051708.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Spitsbergen
    Scott Glacier
    glacier geometry
    surface ablation
    GIS analysis
    Źródło:
    Polish Polar Research; 2008, 29, 2; 163-185
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ridge geometry effect on the behavior of elastohydrodynamic lubrication of point contact problem
    Autorzy:
    Al-Samieh, Mohamed F. Abd
    Powiązania:
    https://bibliotekanauki.pl/articles/1845008.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface roughness
    transverse ridge
    elastohydrodynamics
    amplitude
    chropowatość powierzchni
    elastohydrodynamika
    amplituda
    Opis:
    A numerical solution is presented to investigate the influence of the geometry and the amplitude of the transverse ridge on the characteristics of elastohydrodynamic lubrication for point contact problem under steady state condition. Several shapes of ridges with different amplitudes are used in the stationary case, such as flat-top ridge, cosine wave ridge and sharp ridge of triangular shape. Results of film thickness and pressure distributions of the aforementioned ridge feature are presented at different locations through an elastohydrodynamically lubricated contact zone for different amplitude of the ridge. Simulations were performed using the Newton-Raphson iteration technique to solve the Reynolds equation. The numerical results reveal that, to predict optimum solution for lubricated contact problem with artificial surface roughness, the geometrical characteristics of the ridge should have profiles with smooth transitions such as those of a cosine wave shape with relatively low amplitude to reduce pressure spike and therefore cause the reduction in the film thickness. The position of the location of the ridge across the contact zone and the amplitude of the ridge play an important role in the formation of lubricant film thickness and therefore determine the pressure distribution through the contact zone.
    Źródło:
    Archive of Mechanical Engineering; 2020, LXVII, 4; 491-508
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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