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Wyszukujesz frazę "Belan, Juraj" wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Safety of construction components in a very high number of load cycles
    Autorzy:
    Nový, František
    Belan, Juraj
    Bokůvka, Otakar
    Powiązania:
    https://bibliotekanauki.pl/articles/88657.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    high-strength materials
    fatigue resistance
    push-pull loading
    high-frequency
    S-N curves
    wytrzymałość materiałów
    wytrzymałość zmęczeniowa
    odporność na zmęczenie
    wysoka częstotliwość
    krzywa S-N
    Opis:
    Progressive, high-strength materials have an important position in the transport industry. In this industry, components are subject to high safety and reliability requirements because they often operate under long-term cyclic stress regimes. The paper presents results of fatigue resistance of high-strength materials such DOMEX 700MC, HARDOX 400, HARDOX 450, and INCONEL 718 (UTS from 850 to 1560 MPa) measured at high-frequency cyclic loading (f = 20 kHz, T = 20 ± 5 ° C, push-pull loading, cycle asymmetry parameter of R = -1) in the area from N = 2x106 to N = 2x108 cycles. Fatigue resistance showed a continuous decrease about average value Sa2x108/Sa2x106 = 19.1%.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2020, 2, 1; 199-206
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Structural Parameters - the Shape of Graphite and Matrix on Change of Ultrasonic Wave Propagation Rate and Value of Attenuation in Graphitic Cast Irons
    Autorzy:
    Belan, Juraj
    Tillová, Eva
    Uhríčik, Milan
    Pastierovičová, Lucia
    Powiązania:
    https://bibliotekanauki.pl/articles/26081550.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    badanie ultradźwiękowe
    zapewnienie jakości żeliwa
    grafitowy kształt
    współczynnik perlitu i ferrytu
    ultrasonic investigation
    quality assurance of cast iron
    graphite shape
    pearlite and ferrite ratio
    quantitative evaluation of graphite and matrix
    Opis:
    Despite the tendency of the current industry, especially the automotive industry, it is to use modern, light and super-strong materials based on Al or HSLA steels, the application of classic materials such as cast iron still makes sense, especially concerning price and excellent castability. The article presents one of the possible ways of using the ultrasonic non-destructive method in quality control and simpli-fication of the identification of the type of cast iron concerning the change of parameters of ultrasound propagation in materials. The main criteria for assessing the quality and determining the type of graphite cast iron were considered to be the rate of propagation of ultrasound - cL and the value of attenuation , which vary depending on the shape of the graphite and matrix. Graphitic cast irons with different graphite shapes (lamellar, vermicular, and globular shapes) and a matrix with different ferrite/perlite ratios were used as experimental material. Along with the ultrasonic tests, a metallographic analysis was also performed to quantify the microstructure of cast irons.
    Źródło:
    Production Engineering Archives; 2023, 29, 1; 23--27
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The quality assurance of cast and wrought aero jet engine components made from Ni-base superalloys with using of quantitative metallography methods and alloys lifetime prediction
    Autorzy:
    Belan, Juraj
    Kuchariková, Lenka
    Mazur, Magdalena
    Tillová, Eva
    Hanusová, Patrícia
    Powiązania:
    https://bibliotekanauki.pl/articles/104037.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    quality assurance
    cast Ni-base superalloys
    wrought Ni-base superalloys
    turbine blades
    turbine disc
    quantitative metallography
    zapewnienie jakości
    superstopy na bazie Ni
    łopatki turbin
    tarcza turbiny
    metalografia ilościowa
    Opis:
    The Ni-base superalloys are used in the aircraft industry for the production of aero engine most stressed parts, turbine blades or turbine discs. Quality of aero jet engine components has a significant influence on the overall lifetime of a jet engine as itself as well as the whole airplane. From this reason a dendrite arm spacing, grain size, morphology, number and value of γ' - phase are very important structural characteristics for blade or discs lifetime prediction. The methods of quantitative metallography are very often used for evaluation of structural characteristics mentioned above. The high-temperature effect on structural characteristics and application of quantitative methods evaluation are presented in this paper. The two different groups of Ni-base alloys have been used as experimental material: cast alloys ZhS6K and IN713LC, which are used for small turbine blades production and wrought alloys EI 698VD and EI 929, which are used for turbine disc production. Selected alloys have been evaluated in the starting stage and after applied heattreatment at 850°C for 24 hrs. This applied heat-treatment causes structural changes in all alloys groups. In cast alloy dendritic structure is degraded and gamma prime average size has grown what has a negative influence on turbine blade creep rupture life. Wrought alloys show partially grain boundary melting and grain size changed due to recrystallization what causes mechanical properties decreasing - ultimate tensile strength mainly.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 222-229
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue characteristics of materials used in transport industry applications
    Autorzy:
    Belan, Juraj
    Kuchariková, Lenka
    Mazur, Magdalena
    Tillová, Eva
    Chalupová, Mária
    Powiązania:
    https://bibliotekanauki.pl/articles/88678.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    fatigue properties
    Inconel alloy
    aluminum alloy
    fatigue fracture
    transportation safety
    właściwości zmęczeniowe
    stop Inconel
    stop aluminium
    pęknięcie zmęczeniowe
    próba zmęczeniowa
    bezpieczeństwo transportu
    Opis:
    Designers have a major interest about fatigue properties of materials used in transport industry. Each component in transport works under alternating stress. From this point of view the fatigue properties are important for single parts lifetime resulting into safety of whole components as cars and airplanes what leads to safety on the roads or air and have influence on human life as well. Therefore this paper deals with fatigue properties of wrought Inconel alloy IN 718 and aluminum cast alloy AlSi9Cu3. Both materials were put on fatigue push – pull test, but Ni – based IN 718 alloy at frequency of loading around 20 000 kHz (High Frequency High Cycles Fatigue) and aluminum alloy AlSi9Cu3 at frequency of loading around 80 Hz (Low Frequency High Cycles Fatigue). These parameters were chosen with respect of usage such materials for production of components used in transport industry applications. Results after fatigue tests are presented as Wohler curve. For prediction of source of fracture the SEM fractography analysis of fatigue fracture surfaces was made.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 810-818
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advantages of colour etching in quality control of recycled Al-Si cast alloys
    Autorzy:
    Tillová, Eva
    Kuchariková, Lenka
    Chalupová, Mária
    Belan, Juraj
    Vaško, Alan
    Herčko, Adrián
    Powiązania:
    https://bibliotekanauki.pl/articles/104005.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Al-Si cast alloys
    colour metallography
    microstructure
    quality control
    stopy odlewane Al-Si
    mikrostruktura
    kontrola jakości
    metalografia kolorowa
    Opis:
    Colour Metallography is a set of light metallographic microscopy methodologies that utilize phase colour contrast as a source of new structure information compared to conventional techniques. In many cases, colour contrast can be induced where no identifiable phase contrast is obtained by conventional techniques. With the help of colour contrast, we gain new information on the structure of Al-Si alloys, especially intermetallic phases, in which the benefits of its use in casting quality control are of benefit. Blue-yellow contrast is definitely more pronounced than dark grey or light grey contrast. There is no substantial reproducible colour reproduction, since it is irrelevant whether the two phases are distinguished by blue-yellow or green-ocher contrast. When using the colour contrast, the structural components differ not only according to their microscopic appearance, but also based on the knowledge of the chemical composition of alloys, interactions between structural components, knowledge of the possible influence of Al-alloys structure (e.g. refining, modifications, heat treatment). Colour contrast in quality control of Al-Si alloys was applied to AlSiMg cast alloy (AlSi7Mg0.3; AlSi7MgTi; AlSi10MgMn; etc.).
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 296-303
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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