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Wyświetlanie 1-11 z 11
Tytuł:
Phase Transformations in Nickel base Superalloy Inconel 718 during Cyclic Loading at High Temperature
Autorzy:
Jambor, M.
Bokuvka, O.
Novy, F.
Trsko, L.
Belan, J.
Powiązania:
https://bibliotekanauki.pl/articles/111867.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
nickel base superalloy
Inconel 718
phase transformations
high temperature fatigue
nadstop na bazie niklu
przemiany fazowe
zmęczenie cieplne
zmęczenie materiału
Opis:
Nickel base superalloys are hi-tech materials intended for high temperature applications. This property owns a complex microstructure formed by matrix of Ni and variety of precipitates. The type, form and the amount of these phases significantly affect the resulting properties of these alloys. At sufficiently long exposure to high temperatures, the transformation phase can occur, which can lead to degradation of properties of these alloys. A cyclic plastic deformation can accelerate these changes, and they could occur at significantly lower temperatures or in shorter time of exposure. The aim of this study is to describe phase transformation, which can occur by a cyclic plastic deformation at high temperatures in nickel base superalloy Inconel 718.
Źródło:
Production Engineering Archives; 2017, 15; 15-18
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue properties of nodular cast irons alloyed by Si, Mo and Cu
Autorzy:
Vaško, Alan
Krynke, Marek
Powiązania:
https://bibliotekanauki.pl/articles/88535.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
nodular cast iron
SiMo
SiCu
fatigue
żeliwo sferoidalne
zmęczenie
Opis:
In recent years, the research of nodular cast iron has been focused on increasing fatigue resistence. In the paper, two types of alloyed nodular cast irons have been investigated – SiMo-nodular cast iron alloyed by 4% of silicon and 1% of molybdenum and SiCu-nodular cast iron alloyed by 4% of silicon and 1.5% of copper. SiMo-nodular cast iron is suitable for high-temperature applications, for example the exhaust manifolds of the combustion engines. SiCu-nodular cast iron is used in various components of tribotechnical units. These components are often loaded by fatigue. The mechanical and fatigue behaviour of both nodular cast iron types has been studied by means of tensile test, impact bending test, hardness test and fatigue tests. Fatigue tests were realised at low frequency cyclic push-pull loading up to 10 million cycles. The relationship between the amplitude of stress and number of cycles to failure was investigated and the fatigue strength was determined. Mechanical and fatigue properties of both nodular cast iron types are correlated with the microstructure of specimens.
Źródło:
System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 738-744
2657-5450
Pojawia się w:
System Safety : Human - Technical Facility - Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality and fatigue characteristics relation
Autorzy:
Trsko, L.
Bokuvka, O.
Novy, F.
Lago, J
Powiązania:
https://bibliotekanauki.pl/articles/111638.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
structural steels
fatigue
fatigue parameters relation
stale konstrukcyjne
charakterystyki zmęczeniowe
zmęczenie materiałów
Opis:
This paper will explore the mutual correlation of fatigue characteristics ((Kath, σc, ac = f (Rm)) of five structural steels tested at high frequency loading based on tests (f ≈ 20 kHz, T = 20 ± 10 °C, R = -1). Different fatigue resistance parameters have different meanings and misunderstanding can lead to significant quality problems in component operation. Consequently, it is necessary to completely understand the relation between the two most important fatigue characteristics which are fatigue limit σc and the threshold value of the stress intensity factor amplitude Kath and how they act with changing of steel ultimate tensile strength.
Źródło:
Production Engineering Archives; 2016, 10, 1; 9-12
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:
Fatigue strength improvement of the AISI 316Ti austenitic stainless steel by shot peening
Autorzy:
Novy, F.
Dundekova, S.
Bokuvka, O.
Trsko, L.
Powiązania:
https://bibliotekanauki.pl/articles/111990.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
stainless steel
AISI 316L
shot peening
fatigue strength
stal nierdzewna
śrutowanie
wytrzymałość na zmęczenie
Opis:
Stainless steels are structural materials used for a wide range of applications. One of the fields of application of these highly corrosion resistant materials is for various medical applications. Different methods of mechanical property improvement have been studied in recent years to increase the durability of components manufactured from these materials. The main goal of this study was an analysis of fatigue strength improvement of the AISI 316Ti austenitic stainless steel by shot peening. A significant improvement of surface hardness, yield strength and fatigue limit by shot peening was observed in this study. This is despite increasing the surface roughness which usually degrades material’s fatigue strength.
Źródło:
Production Engineering Archives; 2014, 4, 3; 2-6
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractography analysis of Inconel 718 fatigued at 700°C
Autorzy:
Jambor, M.
Belan, J.
Bokuvka, O.
Novy, F.
Powiązania:
https://bibliotekanauki.pl/articles/111594.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
Inconel 718
high temperature fatigue
fractography analysis
zmęczenie cieplne
nadstop na bazie niklu
analiza fraktograficzna
odkształcenia plastyczne
Opis:
This work deals with the fractography analysis of nickel-base superalloy Inconel 718 fatigued at 700°C in air atmosphere in the high cycle region. During cyclic loading of this alloy at high temperatures some different mechanisms compared to cyclic loading at ambient temperature take place. Cyclic plastic deformation at high temperatures causes some structural changes, which could have some influence.
Źródło:
Production Engineering Archives; 2016, 13, 4; 20-25
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue lifetime of 20MnV6 steel with holes manufactured by various methods
Autorzy:
Bokůvka, O.
Jambor, M.
Trško, L.
Nový, F.
Lisiecka, B.
Powiązania:
https://bibliotekanauki.pl/articles/111905.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
steel 20MnV6
fatigue lifetime
high-cycle fatigue
stal 20MnV6
trwaość zmęczeniowa
zmęczenie wysokocyklowe
Opis:
In this paper, the authors publish their own experimental results of the examination of the different holes (milled, drilled and drilled + shot peened) on the fatigue lifetime of 20MnV6 steel. The experiments were carried out at low-frequency loading (f = 10 Hz, pulsating tension loading) in the region from N = 2×105 up to N = 2×106 cycles. The best fatigue properties were obtained in the parts with drilled + shot peened holes.
Źródło:
Production Engineering Archives; 2018, 19; 3-5
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiaxial fatigue experimental analysis of 6063-T66 aluminum alloy of the base material and the welded material
Autorzy:
Uhríčik, Milan
Kopas, Peter
Palček, Peter
Oršulová, Tatiana
Hanusová, Patrícia
Powiązania:
https://bibliotekanauki.pl/articles/103995.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
multiaxial fatigue
aluminum alloy
fatigue criteria
welding
cyclic loading
zmęczenie wieloosiowe
stop aluminium
kryteria zmęczeniowe
spawanie
obciążenie cykliczne
Opis:
This article deals with determining of fatigue lifetime of aluminum alloy 6063-T66 during by multiaxial cyclic loading. The experiments deal with the testing of specimens for identification of the strain-life behavior of material, the modeling of combined loading and determining the number of cycles to fracture in the region of low-cycle fatigue. Fatigue tests under constant amplitude loading were performed in a standard electromechanical machine with a suitable gripping system. Based on the experimental results the fatigue design curves are compared to the fatigue data from the base material and the welded material and also multiaxial fatigue models, which are able to predict fatigue life at different loads.
Źródło:
Quality Production Improvement - QPI; 2019, 1, 1; 334-341
2657-8603
Pojawia się w:
Quality Production Improvement - QPI
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of non-zero mean stress bending-torsion fatigue on fracture surface parameters of 34CrNiMo6 steel notched bars
Autorzy:
Macek, Wojciech
Szala, Mirosław
Trembacz, Jarosław
Branco, Ricardo
Costa, José
Powiązania:
https://bibliotekanauki.pl/articles/1839494.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
multiaxial fatigue
bending-torsion
notch effect
fatigue fracture
surface topography
zmęczenie wieloosiowe
zginanie
skręcanie
efekt wycięcia
złamanie zmęczeniowe
topografia powierzchni
Opis:
Modern methods of testing materials require the use of the latest technologies and combining measurement and calculation methods. It is important to find a quantitative way of describing, among other things, the failures so that it can help to design with high accuracy. This paper studies loading orientations on crack shape and fracture surface changes. The advantage of the entire fracture surface method is simplicity and applicability in studies on other materials, shapes and loadings. A higher values of fracture surface parameters (Sx, Vx) was observed in failure specimens with lower σ/τ (B/T) ratios. It has been observed that largest crack lengths with a small number of cycles occur for loading combinations different then B=T. As well as analyzed surface parameters Sx, Vx, are higher for larger number of cycles to crack initiation (Ni) values.
Źródło:
Production Engineering Archives; 2020, 26, 4; 167-173
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of inclusions on bending fatigue strength coefficient the medium carbon steel melted in an electric furnace
Autorzy:
Lipiński, Tomasz
Wach, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1839515.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
structural steel
non-metallic inclusions
oxide impurities
fatigue strength
bending fatigue
stal konstrukcyjna
wtrącenia niemetaliczne
zanieczyszczenia tlenkowe
wytrzymałość zmęczeniowa
zmęczenie zginające
Opis:
The parameters of high-grade steel are influenced by a combination of factors, including chemical composition and production technology. The impurity content is also a key determinant of the quality of high-grade steel. Inclusions may also play an important role, subject to their type and shape. Inclusions may increase the strength of steel by inhibiting the development of micro-cracks. The analyzed material was one grade of medium-carbon structural steel. The study was performed on 6 heats produced in an industrial plant in 140 ton electric furnaces. The experimental variants were compared in view of the five heat treatment options. The results were presented to account for the correlations between the fatigue strength coefficient during rotary bending, the diameter of and spacing between impurities. The relationship between the fatigue strength and hardness of highgrade steel vs. the quotient of the diameter of impurities and the spacing between impurities was determined. The proposed equations contribute to the existing knowledge base of practices impact of impurities with various diameters and spacing between non-metallic inclusion on fatigue strength.
Źródło:
Production Engineering Archives; 2020, 26, 3; 88-91
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
    Wyświetlanie 1-11 z 11

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