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    Wyświetlanie 1-4 z 4
    Tytuł:
    Numerical study of large scale truss construction with structural uncertainties
    Autorzy:
    Bednár, Róbert
    Sága, Milan
    Vaško, Milan
    Powiązania:
    https://bibliotekanauki.pl/articles/41204159.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Kazimierza Wielkiego w Bydgoszczy
    Tematy:
    uncertain parameters
    uncertainties and errors
    Monte Carlo method
    interval arithmetic
    optimization
    MATLAB
    Opis:
    The paper deals with efficiency and usability problem for the chosen solution methods for mechanical systems with structural uncertainties. They are significantly influencing the analysis results and the analysis itself. An application of the chosen approaches will be presented – the first one, a simple combination of only inf-values or only sup-values; the second one presents full combination of all inf-sup values; the third one uses the optimizing process as a tool for finding out an inf-sup solution and last one is Monte Carlo method as a comparison tool.
    Źródło:
    Studia i Materiały Informatyki Stosowanej; 2011, 4; 17-22
    1689-6300
    Pojawia się w:
    Studia i Materiały Informatyki Stosowanej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of a Directional Dependenceon Mechanical Properties of Composites Reinforced with Chopped Carbon Fibre Produced by Additive Manufacturing
    Autorzy:
    Majko, Jaroslav
    Handrik, Marian
    Vaško, Milan
    Sága, Milan
    Kopas, Peter
    Dorčiak, Filip
    Sapietová, Alžbeta
    Powiązania:
    https://bibliotekanauki.pl/articles/27313864.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    experimental measurement
    physical properties
    3D printing
    composite
    fibre reinforcement
    MATLAB
    Opis:
    Progress in the industry is accompanied by the development of new materials and more efficient technological production processes. At present, additive production is becoming very attractive in all industries (research, development, production), which brings a number of advantages compared to subtractive methods (customization, production speed, control of material properties by users, etc.). The main advantage of 3D printing is the controlled deposition of material in defined places. Instead of demanding manual labour, fully automated production via computers leads to the manufacturing of complex components from materials whose production in conventional ways would be problematic or even impossible. Because these are new technologies, the main direction of research at present is to identify the basic physical properties of these materials under different types of loading. The main goal of this article is to observe the dependence of the behaviour of the extruded material (thermoplastic reinforced with chopped carbon fibre) on the printing parameters (thickness of the lamina, the orientation of the fibres of the printed material, etc.). Based on published scientific works, it appears that these settings have a significant impact on the achieved physical properties. This is the reason why the authors decided to analyze the influence of these parameters on the basis of processed data from experimental measurements of mechanical properties in the MATLAB program. As this is FFF printing, an essential condition is to identify and specify the directional dependence of the behavior of the printed material. This physical phenomenon is a necessary condition for gradual knowledge for the purposes of a subsequent mathematical description of the material properties. According to the authors, for the purposes of modeling these materials in FEM-based programs, it is essential to define the directional dependence in the plane of the lamina.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 455--461
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue Resistance and Other Utility Properties of NiMn-Type of Austenitic Nodular Cast Iron
    Autorzy:
    Vaško, Alan
    Uhríčik, Milan
    Kaňa, Václav
    Powiązania:
    https://bibliotekanauki.pl/articles/27707054.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Ni-Resist
    austenitic nodular cast iron
    EN-GJSA-XNiMn13-7
    fatigue
    push-pull loading
    Opis:
    The aim of this paper is to evaluate the fatigue resistance of austenitic nodular cast iron and to compare it with other types of nodular cast irons. The austenitic nodular cast iron, used for the experiments, was alloyed by 13% nickel and 7% manganese (EN-GJSA-XNiMn13-7) to obtain an austenitic matrix. The microstructure was studied using light metallographic microscopy. Mechanical properties were investigated by tensile test, impact bending test and Brinell hardness test. Fatigue tests were carried out at sinusoidal cyclic push-pull loading at ambient temperature. The results of fatigue tests were compared with the fatigue properties of ferrite-pearlitic nodular cast iron and pearlite-ferritic nodular cast iron. Experimental results show that NiMn-type of austenitic nodular cast iron has lower tensile strength and hardness, but higher elongation and absorbed energy than the compared types of nodular cast iron. However, austenitic nodular cast iron has lower fatigue limit.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 563--569
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contribution to random vibration numerical simulation and optimisation of nonlinear mechanical systems
    Autorzy:
    Sága, Milan
    Vaško, Milan
    Handrik, Marian
    Kopas, Peter
    Powiązania:
    https://bibliotekanauki.pl/articles/947404.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    statistical linearization
    sensitivity analysis
    structural optimisation
    linearyzacja statystyczna
    analiza wrażliwości
    optymalizacja strukturalna
    Opis:
    This study considered the solution of the stochastic vibration of non-linear mechanical systems with Gaussian random excitations. It realised a short review of linearisations techniques in stochastic dynamics mainly with application in the area of truss finite element modelling. The presented method of statistical linearisation is applied to numerical testing. In the second part of the article, the sensitivity analysis of the first two stress statistical moments and structural weight minimising subjected to the random stress constrains presented by mean value and standard deviation was brought to the fore. Cross-sectional areas were used as optimising parameters.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2019, 103; 143-154
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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