Autor: Bokůvka, Otakar - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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 S_a2x10⁸/S_a2x10⁶ = 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

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Skocz do pozycji: 2.

Tytuł:: Tribological behavior of low-alloyed steel after nitriding
Autorzy:: Vicen, Martin
Bokůvka, Otakar
Nikolić, Ružica
Bronček, Jozef
Powiązania:: https://bibliotekanauki.pl/articles/1839516.pdf
Data publikacji:: 2020
Wydawca:: Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:: low alloyed steels
nitriding
tribology
behavior
stale niskostopowe
azotowanie
trybologia
zachowanie
Opis:: The tribological properties of the nitride layer applied to the low-alloyed steel were investigated in this research. Experimental work included determination if the chemical composition, wear resistance, Rockwell, Vickers and nano-indentation tests, both of the substrate material – the low-alloyed steel and the deposited nitride layer. From the results obtained in those experiments authors concluded that applying the nitride layer does not significantly improve the tribological properties of the tested lowalloyed steel samples, thus this process is not recommended for achieving that purpose.
Źródło:: Production Engineering Archives; 2020, 26, 3; 78-83
2353-5156
2353-7779
Pojawia się w:: Production Engineering Archives
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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 σ_a2x10⁹/ σ_a2x10 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

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Skocz do pozycji: 4.

Tytuł:: Influence of Window Roller Blinds on Energy Consumption in Residential Buildings in Serbia
Autorzy:: Djoković, Jelena M.
Nikolić, Ružica R.
Bokůvka, Otakar
Pastorková, Jana
Powiązania:: https://bibliotekanauki.pl/articles/27323565.pdf
Data publikacji:: 2023
Wydawca:: Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:: exterior window blinds
heat load
cooling load
lighting
energy efficiency
rolety zewnętrzne
obciążenie cieplne
obciążenie chłodnicze
oświetlenie
efektywność energetyczna
Opis:: Roller blinds are devices that are retracted and wrapped in a box above the window opening and are used to protect against the solar radiation. Those are the well-known devices with distinct advantages over the fixed external dimming elements. The influence of external blinds on the internal thermal environment in climatic conditions in the Republic of Serbia, the city of Kragujevac, was considered in this research. An external blind was installed in the test room and its influence on the internal temperature was compared with the internal temperature of the room without the blind. Real-time monitoring was carried out in February and August 2023. The results presented in this paper show that the blind reduces the temperature in summer by 3.57ºC and increases it in winter by 1.76ºC. The cooling load can be reduced by about 20%, and the heat load by about 15%.
Źródło:: System Safety : Human - Technical Facility - Environment; 2023, 5, 1; 75-82
2657-5450
Pojawia się w:: System Safety : Human - Technical Facility - Environment
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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

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