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Wyszukujesz frazę "Nový, František" wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Investigation of tribological properties of CarbonX coating deposited on 100Cr6 steel
    Autorzy:
    Vicen, Martin
    Bronček, Jozef
    Nový, František
    Powiązania:
    https://bibliotekanauki.pl/articles/111932.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    tribology
    DLC coating
    100Cr6 steel
    friction
    trybologia
    powłoka DLC
    stal 100Cr6
    tarcie
    współczynnik tarcia
    Opis:
    The article deals with a reduction of friction coefficient of bearing steel 100Cr6. Reduction of friction was achieved by means of a CarbonX DLC coating. The coating exhibited excellent friction and mechanical properties. This coating was applied to samples made of 100Cr6 bearing steel. The friction results of the CarbonX coating were compared to the friction results of the 100Cr6 bearing steel. Reducing the friction of 100Cr6 bearing steel resulted in reduced wear and increase lifetime. The friction process of the samples will take place in an environment without lubrication. The aim of the article is to verify the behaviour of the DLC coating without the presence of lubricant in the friction node. The achieved results are to be interpreted in the conclusion of article.
    Źródło:
    Production Engineering Archives; 2019, 25; 52-55
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    The changes of LD-PE films after exposure in different media
    Autorzy:
    Kojnoková, Tatiana
    Markovičová, Lenka
    Nový, František
    Powiązania:
    https://bibliotekanauki.pl/articles/1839501.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    polyethylene
    recycling
    LDPE film
    water absorption
    melting temperature
    polietylen
    recykling
    folia LDPE
    absorpcja wody
    temperatura topnienia
    Opis:
    This work deals with the study of polymers, and, in particular, polyethylene; its production, types, properties, and usage. The experimental part evaluates the changes of properties of the polyethylene film to be reused under various exposure conditions and selection of the most suitable medium for its application. The film made of low-density polyethylene (LD-PE) was influenced by aggressive media with different pH, specifically Savo for the disinfection, Savo as a Saponate for dish washing and Coca-Cola. On LD-PE films the water absorption and melting temperature evaluation tests were performed. Carried out tests show that the most aggressive medium for LD-PE film from used media is Coca-Cola. The most effective application of LD-PE film like wrapping on container transported is the Savo used as a Saponate for dish washing.
    Źródło:
    Production Engineering Archives; 2020, 26, 4; 185-189
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Safe choice of structural steels in a region of ultra-high number of load cycles
    Autorzy:
    Nový, František
    Bokůvka, Otakar
    Trško, Libor
    Jambor, Michal
    Powiązania:
    https://bibliotekanauki.pl/articles/112057.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    structural steels
    fatigue resistance
    ultra high cycle fatigue
    stal konstrukcyjna
    odporność na zmęczenie
    wytrzymałość zmęczeniowa
    Opis:
    In this paper the authors introduce their own selected experimental results in the field of the investigation of fatigue resistance of structural steels. The experiments were carried out on the nine structural steels including high strength steels, DOMEX 700MC, HARDOX 400, HARDOX 450, 100Cr6 (UTS from 446 MPa to 2462 MPa) at high-frequency cyclic loading (f = 20 kHz, T = 20 ± 5 °C, R = -1) in the region of number cycles ranged from N ≈ 2×106 to N ≈ 2×106 cycles of loading. The continuous decrease of fatigue strength in dependence on the number of loading cycles was observed with the average value of ratio σa2x109/ σa2x10 6 = 0.69.
    Źródło:
    Production Engineering Archives; 2019, 24; 25-28
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical properties of Super 304H steel after long-term ageing at 650 and 700°C
    Autorzy:
    Zieliński, Adam
    Sroka, Marek
    Purzyńska, Hanna
    Novy, Frantisek
    Powiązania:
    https://bibliotekanauki.pl/articles/2204537.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Super 304H steel
    mechanical properties
    ageing
    stal Super 304H
    właściwości mechaniczne
    starzenie się
    Opis:
    The paper shows the degradation process of the modern austenitic Super 304H (X10CrNiCuNb18-9-3) steel which was subjected to long-term aging for up to 50,000 h at 650 and 700°C. The investigations include microstructure examination (SEM), identification and analysis of the precipitation process, and mechanical properties tests. The Super 304H steel has a structure characteristic of austenitic steels with visible annealing twins and single primary NbX precipitates. Long-term aging in the steel leads to numerous precipitation processes of M23C6, MX carbides, σ phase, Z phase, and ε-Cu phase. Precipitation processes lead to a decrease in plastic properties and impact energy as well as alloy over aging. Yield strength and tensile strength values after 50,000 h of aging were similar to those as delivered. The yield and tensile strength value strongly depend on the applied aging temperature.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e144612
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of selected properties and surface quality of cured pre-impregnated carbon-fiber fabrics after exposure to sulphuric acid
    Autorzy:
    Kojnoková, Tatiana
    Nový, František
    Markovičová, Lenka
    Harea, Evgheni
    Harea, Evghenii
    Powiązania:
    https://bibliotekanauki.pl/articles/26081735.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    tkaniny węglowe
    żywica epoksydowa
    zmiana wagi
    jakość powierzchni
    carbon fabrics
    epoxy resin
    micro-hardness
    weight change
    surface quality
    Opis:
    This paper deals with changes in selected properties of composite material and surface degradation after exposure to an acidic environment. A carbon fiber-reinforced composite (CFRP) produced from prepregs was tested. The weight change, micro-hardness, and surface degradation of the CFRP composite made of cured pre-impregnated laminates were evaluated in this study. Material consisting of a DT121R epoxy resin matrix with high reactivity and high viscosity, with two reinforcing carbon fabrics layers, is characterized by a low value of tensile strength. Evaluation of changes in the material properties was performed before and after exposure to specific environmental conditions, which are achieved by using a chemical solution of 15% H2SO4 at various temperatures. Subsequently, the effect of 15% H2SO4 at various temperatures on the material properties was monitored. The specimens were immersed in the solution for up to 3 and 6 weeks at the temperatures of 23°C, 40°C, and 60°C. It was found out, that the degradation of the composite material is conditioned by the aging of the epoxy resin (matrix). Carbon fibers (reinforcement) are relatively stable. The weight change, micro-hardness, and surface quality depend on the time of exposure to acidic solution and temperature. The micro-hardness tests show a significant influence on exposure time. The biggest changes in weight change and surface quality of the CFRP composite were observed after exposure at the temperature of 60°C.
    Źródło:
    Production Engineering Archives; 2023, 29, 1; 1--6
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and residual stress analysis of Strenx 700 MC welded joint
    Autorzy:
    Trško, Libor
    Lago, Ján
    Jambor, Michal
    Nový, František
    Bokůvka, Otakar
    Florková, Zuzana
    Powiązania:
    https://bibliotekanauki.pl/articles/1839521.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    residual stress
    high strength steel
    welding
    microstructure
    grain coarsening
    naprężenia szczątkowe
    stal o wysokiej wytrzymałości
    spawalnictwo
    mikrostruktura
    Opis:
    High strength low alloy (HSLA) steels are a new generation of plain carbon steels with significantly improved mechanical properties while maintaining good weldability with common commercial techniques. Residual stress and microstructural analysis of welded HSLA Strenx 700 MC was carried out in this research. Results have shown that the welding process causes significant grain coarsening in the heat affected zone. The microstructural changes are also accompanied with creation of tensile residual stress field in the weld metal and heat affected zone, reaching up-to depth of 4 mm. Tensile residual stresses are well known for acceleration of fatigue crack initiation and together with coarse grains can lead to significant decrease of the fatigue properties of the welded structure.
    Źródło:
    Production Engineering Archives; 2020, 26, 2; 41-44
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Shot Peening on the Wear Behaviour of Medium Carbon Steel
    Autorzy:
    Vicen, Martin
    Bokůvka, Otakar
    Trško, Libor
    Drbul, Mário
    Nikolić, Ružica
    Nový, František
    Powiązania:
    https://bibliotekanauki.pl/articles/26075754.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    stal
    kulkowanie
    zużycie ścierne
    steel
    shot peening
    wear behaviour
    Opis:
    Influence of shot peening on the wear behaviour of medium carbon, C55 steel was experimentally verified. Experimental work included determination of the chemical composition, heat treatment, microstructure evaluation, mechanical properties measurement, shot peening treatment, the magnitude of the compressive residual stresses was evaluated, roughness profiles measurement and finally the friction tests. The results evidence the significant role played by the applied shot peening on wear behaviour of medium carbon steel. An important effect of surface roughness has been demonstrated. The coefficient of friction after shot peening compared to ground surface increased, 1.44 – 1.85 times.
    Źródło:
    Production Engineering Archives; 2022, 28, 3; 241--245
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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