Wszystkie pola: 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

Artykuł

Skocz do pozycji: 2.

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

Artykuł

Skocz do pozycji: 3.

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

Skocz do pozycji: 4.

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

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