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    Wyświetlanie 1-7 z 7
    Tytuł:
    Thermal phenomena in the friction process of the TG15 - hard anodic coating couple
    Autorzy:
    Służałek, G.
    Posmyk, A.
    Skoneczny, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/351406.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hard anodic coatings
    plastic materials
    oil free couples
    friction heat
    numerical simulation
    Opis:
    The paper presents a one-dimensional model of heat conduction in a couple consisting of a cylinder made of a sliding plastic material, TG15, and a cuboid made of alloy AW 6061 coated with a hard anodic coating, where the couple is heated with the heat generated during friction. TG15 is a composite material based on polytetrafluoroethylene (PTFE) with a 15% graphite filler, used for piston rings in oil-free air-compressors. Measurement of temperature in the friction zone is extremely important for the understanding and analysis of the phenomena occurring therein. It is practically impossible to introduce a temperature sensor in such a place. Therefore, the interaction taking place in such a couple was modelled using numerical methods. In order to simplify and accelerate the calculations, a one-dimensional model and constant thermophysical parameters of the materials participating in friction were adopted. To solve the proposed model, the finite difference method was used (FDM). The resultant system of equations was solved by means of an explicit scheme.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1497-1502
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Underground storage tanks and containers from plastic material
    Podziemne zbiorniki i kontenery z tworzywa sztucznego
    Autorzy:
    Vojtasik, K.
    Aldorf, J.
    Hrubesova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/350102.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    podziemne zbiorniki
    tworzywa sztuczne
    konstrukcje kompozytowe
    obliczenia statyczne
    underground tanks
    plastic materials
    composite structures
    design calculations
    Opis:
    The contribution describes an evaluation method of an external wall of underground storage tanks and containers. The wall are of a sandwich - composite construction. The composite is formed by plastic tabular or wall elements and layers of concrete. In some cases, concrete is supported by a steel mesh. The evaluation method is based on the determination parameters of the composite and the straining coefficient of material forming the composite. These are determined based on a condition regarding coequal dislocations on internal borders between the layers - materials of the composite.
    W artykule opisana jest metoda obliczania zewnętrznej ściany podziemnych zbiorników i kontenerów. Ściany te posiadają konstrukcję warstwową (sandwiczową). Kompozyt jest uformowany w postaci elementów ściennych lub warstwowych z tworzywa sztucznego oraz warstw betonu. W niektórych przypadkach beton jest wzmocniony siatką stalową. Metoda obliczeń jest oparta na określeniu parametrów odkształceniowych kompozytu oraz współczynnika deformacyjnego materiału tworzącego kompozyt. Zostały one określone z warunku równości przemieszczeń na granicach warstw - materiałów kompozytu.
    Źródło:
    Górnictwo i Geoinżynieria; 2005, 29, 3/1; 469-475
    1732-6702
    Pojawia się w:
    Górnictwo i Geoinżynieria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected issues concerning degradation of material in the production of injection molded plastic components
    Autorzy:
    Jałbrzykowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/386404.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    dyes for plastic materials
    thermal degradation
    thermogravimetric tests
    tribological tests
    barwniki do tworzyw sztucznych
    degradacja termiczna
    badania termograwimetryczne
    testy tribologiczne
    Opis:
    This paper presents the problem of thermal degradation of thermoplastic materials processed using the injection method. Attention was paid to the issue of the optimal selection of a dye for modifying the base materials. For the selected materials and dyes, derivatograph tests were performed in order to assess their thermal characteristics and breakdown kinetics. Additionally, tribological tests and microscope observations of selected samples were performed. The obtained test results suggest a diverse level of thermal processes in the analyzed materials. This is crucial for the appropriate selection of dyes for plastic materials. As it turned out, the tribological properties of materials can also influence the technological quality of the injected alloy.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 3; 173-180
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of pressure evolution in granular materials in converging bins during filling and emptying processes
    Autorzy:
    Sielamowicz, I.
    Mróz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955766.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Gdańska
    Tematy:
    granular materials
    pressure
    elastic and elasto-plastic model
    filling
    empting
    Opis:
    A simplified analysis of deformation and stress states in converging hoppers during filling and discharge of granular material is presented. In particular we discuss a method for solving the set of differential equations governing the flow of granular material in a plane wedge hopper. The equilibrium conditions and stress-strain relations are satisfied for the planar slice elements assuming the dependence of displacement and stress on the Cartesian coordinate z. The transient flow of an icompressible, cohesionless granular material in a two-dimensional converging hopper is considered. We assume the material to be in elastic or elasto-plastic states within the hopper satisfying the Coulomb yield condition and the non-associated flow rule. The paper presents a detailed analysis of the evolution of pressure acting on the hopper wall during the filling and emptying processes when the initial active state of pressure is transformed into a passive state. Analytical and numerical analyses are presented. It is shown that at the initial stage of the emptying process a considerable switch overpressure develops, exceeding the steady-state passive pressure several times.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 4; 643-666
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From quantity to quality: massive molecular dynamics simulation of nanostructures under plastic deformation in desktop and service grid distributed computing infrastructure
    Autorzy:
    Gatsenko, O.
    Bekenev, L.
    Pavlov, E.
    Gordienko, Y. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/305256.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    distributed computing
    desktop grid
    service grid
    speed up
    molecular dynamics
    materials science
    nanocrystal
    plastic deformation
    Opis:
    The distributed computing infrastructure (DCI) on the basis of BOINC and EDGeS-bridge technologies for high-performance distributed computing is used for porting the sequential molecular dynamics (MD) application to its parallel version for DCIwith Desktop Grids (DGs) and Service Grids (SGs). The actual metrics of the working DG-SG DCI were measured, and the normal distribution of host performances, and signs of log-normal distributions of Rother characteristics (CPUs, RAM, and HDD per host) were found. The practical feasibility and high efficiency of the MD simulations on the basis of DG-SG DCI were demonstrated during the experiment with the massive MD simulations for the large quantity of aluminum nanocrystals (Statistical analysis (Kolmogorov-Smirnov test, moment analysis, and bootstrapping analysis) of the defect density distribution over the ensemble of nanocrystals had show that change of plastic deformation mode is followed by the qualitative change of defect density distribution type over ensemble of nanocrystals. Some limitations (fluctuating performance, unpredictable availability of resources, etc.) of the typical DG-SG DCI were outlined, and some advantages (high efficiency, high speedup, and low cost) were demonstrated. Deploying on DG DCI allows to get new scientific quality from the simulated quantity of numerous configurations by harnessing sufficient computational power to undertake MD simulations in a wider range of physical parameters (configurations) in a much shorter timeframe.
    Źródło:
    Computer Science; 2013, 14 (1); 27-44
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Technology for Ultrafine-Grained Materials for Usage as Materials in Nuclear Power
    Autorzy:
    Naizabekov, Abdrakhman
    Arbuz, Alexandr
    Lezhnev, Sergey
    Panin, Evgeniy
    Knapiński, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/27315817.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    radial-shear rolling
    austenitic stainless steel
    severe plastic deformation
    ultrafine-grained materials
    walcowanie
    stal nierdzewna
    odkształcenie plastyczne
    materiały ultradrobnoziarniste
    Opis:
    Nuclear power is associated with great environmental risks. In many cases, the problem of accidents of nuclear power plants is related to the use of materials that do not fully meet the following requirements: high corrosion resistance; high temperature resistance; creep resistance; fracture toughness; stability of structure and properties under irradiation. Therefore, studies aimed at finding materials that can withstand long-term loads at high temperatures, aggressive environment and gradual structural degradation under the influence of radiation are relevant. One of the structural materials, which has high resistance to radiation, is austenitic stainless steel. And one of the ways to increase the radiation resistance of parts made of this steel grade is to grind its microstructure to ultra-fine-grained state. Such structures provide a combination of a high level of strength characteristics with high plasticity, which distinguishes such materials from their coarse-grained counterparts. Also, numerous grain boundaries serve as runoff surfaces for radiation defects, preserving the structure, which causes their increased radiation resistance. From all methods for producing sub-ultra-fine grained materials the most promising is the severe plastic deformation (SPD), which can be implemented in the metal in various ways, including radial-shear rolling. This paper presents the results of studies of the process of radial-shear rolling on the mill SVP-08 and its effect on the microstructure and properties of austenitic stainless steel. During the study, bars with a diameter of 13 mm from AISI-321 steel with a grain size of 300-600 nm were obtained, while the mechanical properties increased more than 2 times compared to the initial values.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 2; 114-125
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reuse of polyester-glass laminate waste in polymer composites
    Autorzy:
    Chomiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055763.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    mechanical properties
    polymeric composite materials
    plastic forming
    filler of polyester-glass laminate powder
    high impact polystyrene
    właściwości mechaniczne
    kompozyty z tworzyw sztucznych
    kształtowanie plastyczne
    laminat poliestrowo-szklany
    polistyren wysokoudarowy
    Opis:
    Purpose: of this paper is to develop a new generation of polymer composite materials that would ensure the use of residual and serious environmental problems of polyester-glass laminate waste. Design/methodology/approach: The glass reinforced polyester waste was ground and added to produce new composites. Thermoplastic - high impact polystyrene was selected for the composite matrix. Composites containing 10, 20, 30% by weight of the filler of polyester-glass laminate powder were made. The process of extrusion and subsequent injection was used to prepare the test samples. The influence of the filler on selected properties of composites was evaluated. The physical properties of the filler as well as the processing properties of the mixture as well as the mechanical properties - impact strength and tensile strength of the obtained composites were investigated. Findings: A decrease in tensile strength and impact strength was observed along with an increase in the amount of filler. Research limitations/implications: It would be interesting to carry out further analyzes, in particular with a higher volume fraction of the filler or with a different composite structure, e.g. using PVC as a matrix. The developed research topic is a good material for the preparation of publications of a practical and scientific nature, especially useful in the research and industrial environment. Practical implications: The shredded glass-polyester waste can be used as a filler of polystyrene, however, the resulting composite could be used to produce parts with slightly less responsible functions such as artificial jewelery or toy elements. Originality/value: Obtained results are a new solution a global waste management solution for glass reinforced polyester waste, which may contribute to the sustainable development of the composite materials industry through the partial utilization of waste composites with a duroplastic matrix.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 107, 2; 49--58
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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