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    Wyświetlanie 1-4 z 4
    Tytuł:
    Optimizacija parametrov chistovojj obrabotki plasticheskim deformirovaniem valov
    Parameters optimization of the finishing with plastic deformation of the shafts
    Autorzy:
    Kjurchev, S.
    Penev, O.
    Mirnenko, Y.
    Sosnowskijj, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/76382.pdf
    Data publikacji:
    2016
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    plastic deformation
    plastic processing
    running surface
    layer deformation
    heat flux
    surface roughness
    parameter optimization
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2016, 18, 1
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of wear mechanism of tread during operation of railway wheels
    Badanie mechanizmu zużycia powierzchni tocznej podczas eksploatacji kół kolejowych
    Autorzy:
    Gubenko, S.
    Proidak, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/374924.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    zużycie
    koło kolejowe
    odkształcenie plastyczne
    wear
    railway wheel
    plastic deformation
    formation of white layer
    Opis:
    Causes of wear particles formation on railway wheels tread were investigated. Structural factors connecting with plastic deformation, formation of "white layer", and also with non-metallic inclusions and corrosive products of wheel steel, defining wear of railway wheels tread during operation were fixed.
    Źródło:
    Transport Problems; 2012, 7, 3; 119-125
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stiffness and strength of structural layers from cohesionless material
    Autorzy:
    Gerber, Ulf
    Sysyn, Mykola
    Zarour, Jandab
    Nabochenko, Olga
    Powiązania:
    https://bibliotekanauki.pl/articles/223571.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ballast layer
    crushed stone
    deformation modulus
    strength
    carrying capacity
    warstwa niespoista
    kruszywo
    moduł odkształcenia
    wytrzymałość
    nośność
    Opis:
    The deformation modulus and permissible stress are two independent parameters that depict the carrying capacity of foundations, including earthworks and ballast layer. Nevertheless, while designing the track superstructure or controlling its state, they are considered separate to each other, even though they are terms of the same measure. The scientific problem is due to the practical necessity of unified building rules and standards. The carrying capacity of earthworks and foundations is regulated with standards based both on deformation and on stress criteria, which are not related to each other. This plays particularly important role for railway ballast layer, as an intermediate between the solids and soil. The objective of the present research is to estimate the relationship between deformation modulus and the strength of ballast layer. An overview of modern approaches according to the relation between the stiffness, deformation modulus, elasticity and strength of soils and crushed stone is done. The strength of ballast layer is considered depending on the experimental test: the direct shear test, compressive strength in the uniaxial or biaxial stress state. Load transfer model in crushed stone is proposed. The load transfer angle and cone of loading distribution are determined based on the load transfer and compressive strength models. The relation between deformation modulus and strength is derived from two simple laboratory experiments with cohesionless ballast material. The experiment tests have shown that the ballast stiffness as well as its strength are influenced with the support stress. The measurement of elastic and residual settlements for the different support stress values enables to determine the relation. It can be potentially used for the development of methods for the ballast compaction control, unification of construction norms. The research result should be considered as an approach for unification of two different ways to reflect the carrying capacity of ballast layer.
    Źródło:
    Archives of Transport; 2019, 49, 1; 59-68
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of sand columns in the reinforcement of weak layers in road engineering
    Autorzy:
    Ayyad, Sami Mohammed
    Ahmad, Omar Asad
    Powiązania:
    https://bibliotekanauki.pl/articles/1853672.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kolumna piaskowa
    odkształcenie względne
    odbudowa
    budownictwo drogowe
    wzmocnienie
    warstwa słaba
    sand column
    relative deformation
    rebuilding
    road engineering
    reinforcement
    weak layer
    Opis:
    It is an established fact that when roads are planned and constructed, consideration needs to be given to ensuring the strength of the road surface. It is, however, also the case that when an existing road is being rebuilt or is under maintenance, its base may need to be fortified to increase the road’s vehicle-carrying capacity. The base may, for example, contain a high proportion of weak soil that would be difficult, time-consuming, and costly to remove. This paper aims to investigate the efficacy of using sand-filled piles to reduce road deformation. Experiments conducted on sponge samples confirm that there is a relationship between the total area of sand-filled piles and relative reduction in deformation. It finds that the relationship is non-linear, but that the relationship can be made linear by adjusting the area of sand-filled piles. When the area of sand-filled piles increases from 7.8% to 19.4%, the deformation module can change by up to 100%. Relative reduction in deformation can change from 14% to 45.5% when the area of sand-filled piles increases from 7.8% to 11.7%. The maximum reduction in deformation - 92.4% - occurs when the area of sand-filled piles exceeds 19.5%. Changing the loads borne also affects the deformation module. This paper found that when there was a 10 to 15kg load, and the number of sandfilled piles was increased, there was a change in the deformation module by 380-470%. When there was only a 5kg load on the sample, and the number of sand-filled piles was increased, there was a change in the deformation module by up to 1217%.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 1; 527-538
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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