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    Wyświetlanie 1-12 z 12
    Tytuł:
    Fatigue Properties of Nodular Cast Iron at Low Frequency Cyclic Loading
    Autorzy:
    Vaško, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353103.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fatigue test
    low frequency cyclic loading
    nodular cast iron
    steel scrap
    silicon carbide
    Opis:
    Three melts of ferrite-pearlitic nodular cast iron with different charge composition were used for fatigue tests. Wöhler fatigue curves and fatigue strength were obtained, and microstructure and fracture surfaces were investigated. The aim of the paper is to determine the influence of charge composition on microstructure, mechanical and fatigue properties of synthetic nodular cast irons and their micromechanisms of failure. Fatigue tests were realised at low frequency sinusoidal cyclic push-pull loading (stress ratio R = −1) at ambient temperature (T = 20 ±5°C). They were carried out with using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100 at frequency f ≈ 120 Hz. The results of fatigue tests at low frequency cyclic loading are compared with fatigue properties at high frequency cyclic loadin.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2205-2210
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation between shape factor and mechanical properties of graphitic cast irons
    Autorzy:
    Vasko, A.
    Vasko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/973009.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    shape factor
    cast iron
    graphite
    microstructure
    mechanical properties
    współczynnik kształtu
    żeliwo
    grafit
    mikrostruktury materiałów
    właściwości mechaniczne
    Opis:
    The evaluation of shape factor (circularity) is a subject of interest in many fields of applications such as medicine and industrial processes. The shape factor plays an important role in materials science as a way to understand the relationship between microstructure and mechanical properties of technical materials. The paper deals with measurement of shape factor of graphitic particles with the aim to understand the influence of microstructure (especially shape of graphite) on mechanical properties of graphitic cast irons.
    Źródło:
    Production Engineering Archives; 2016, 11, 2; 11-14
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The micro-mechanisms of failure of nodular cast iron
    Autorzy:
    Vasko, A.
    Chalupova, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/112051.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    nodular cast iron
    ferrite-pearlitic matrix
    mechanical properties
    micromechanisms of failure
    żeliwa sferoidalne
    macierz ferrytyczno-perlityczna
    właściwości mechaniczne
    niewydolność mikromechanizmów
    Opis:
    The contribution deals with a comparison of the micro-mechanisms of failure of nodular cast irons at static, impact and fatigue stress. Several specimens of ferrite-pearlitic nodular cast irons with different content of ferrite in a matrix were used for metallographic analysis, mechanical tests and micro-fractographic analysis. Mechanical properties were found by static tensile test, impact bending test and fatigue tests. The micro-fractographic analysis was made with use of scanning electron microscope VEGA II LMU on fracture surfaces of the specimens fractured by these mechanical and fatigue tests. Fracture surfaces of analysed specimens are characteristic of mixed mode of fracture. Micro-mechanism of failure of nodular cast irons is dependent on the method of stress.
    Źródło:
    Production Engineering Archives; 2014, 5, 4; 31-35
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical methods for analysis of mechanical systems with uncertain parameters
    Autorzy:
    Vasko, M.
    Saga, M.
    Vasko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/111662.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    possibility theory
    uncertain parameters
    interval numbers
    fuzzy numbers
    numerical methods
    MATLAB
    teoria możliwości
    niepewne parametry
    liczby rozmyte
    metody numeryczne
    Opis:
    The paper presents new and improved numerical methods designed for analysis of mechanical systems with uncertain parameters. Uncertain parameters in mechanical systems are described using possibility theory. The main representatives of this theory are fuzzy and interval numbers. Algorithms using interval and fuzzy numbers are incorporated into the analysis. The possibilities and efficiency of suggested methods and algorithms are tested by programs created in the environment of the software package MATLAB.
    Źródło:
    Production Engineering Archives; 2016, 11, 2; 18-21
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A brief overview and metallography for commonly used materials in aero jet engine construction
    Autorzy:
    Belan, J.
    Vasko, A.
    Kucharikova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/111670.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aluminium alloy
    titanium alloy
    nickel-base alloys
    metallography procedures
    B/W and colour contrast
    stop aluminium
    stop tytanu
    stopy na bazie niklu
    odczynnik trawiący
    Opis:
    Aluminium, titanium, and nickel base alloys are mostly and widely used for aircraft jet engine construction. A proper evaluation of its microstructure is important from working safety point of view. To receive a well prepared sample of microstructure, some important steps have to be undertaken. Except for proper grinding and polishing of a sample, structure developing is a significant step, too. In order to develop microstructure various chemical reagents were used to achieve the best results for microstructure evaluation. The chemical reagents were used according to the previous knowledge and some new ones were also tested. Aluminium AK4-1č, titanium VT – 8, and nickel VŽL – 14 and ŽS6 – U alloys were used as an experimental materials. Alloy AK4-1č is used for fan blade production with working temperatures up to 300°C. It is a forged piece of metal machined down into final shape by five-axe milling machine. Alloy VT – 8 is used for high pressure compressor rotor blade production with working temperatures up to 500°C. Blades are forged as well and finally grinded. Finally nickel base alloys VŽL – 14 and ŽS6 – U are used for turbine blade production with working temperatures up 950°C. Blades for turbine are casted into mould with reducible models.
    Źródło:
    Production Engineering Archives; 2017, 17; 9-14
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of low and high frequency fatigue tests
    Autorzy:
    Vasko, A.
    Belan, J.
    Kucharikova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/111844.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    fatigue test
    low frequency cyclic loading
    high frequency cyclic loading
    nodular cast iron
    test zmęczeniowy
    cykliczne obciążenie niskoczęstotliwościowe
    cykliczne obciążenie o wysokiej częstotliwości
    żeliwo sferoidalne
    Opis:
    The paper presents the results of low and high frequency fatigue tests carried out on nodular cast iron. The specimens of synthetic nodular cast irons from three different melts were studied in the high cycle fatigue region (from 105 to 108 cycles) using fatigue experimental equipments for low and high frequency cyclic loading. Low frequency fatigue tests were carried out at frequency f ≈ 120 Hz using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100; high frequency fatigue tests were carried out at frequency f ≈ 20 kHz using the ultrasonic fatigue testing device KAUP-ZU. Both fatigue tests were realised at sinusoidal cyclic push-pull loading (stress ratio R = –1) at ambient temperature (T = 20 ± 5 °C).
    Źródło:
    Production Engineering Archives; 2017, 17; 15-18
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static and Dynamic Mechanical Properties of Nodular Cast Irons
    Autorzy:
    Vaško, A.
    Belan, J.
    Tillová, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/354847.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nodular cast iron
    microstructure
    mechanical properties
    fatigue
    failure mode
    Opis:
    Effects of charge composition on microstructure, mechanical and fatigue properties of nodular cast irons have been studied. For experiments, five melts of nodular cast iron were used – three types of unalloyed nodular cast irons (with different ratio of steel and pig iron in a charge and different additives for regulation of the chemical composition) and two types of alloyed nodular cast irons (SiMo- and SiCu- nodular cast iron). The microstructure of the specimens was evaluated according to a norm and by automatic image analysis. The mechanical properties were investigated by the tensile test, impact bending test and Brinell hardness test. The fatigue tests were carried out at sinusoidal cyclic push-pull loading at ambient temperature. The best mechanical properties were reached in the nodular cast iron alloyed by Si and Cu, what is related to its microstructure.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 185-190
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of structure and mechanical properties of nodular cast irons after casting and after heat treatment
    Autorzy:
    Vaško, A.
    Belan, J.
    Kuchariková, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/114859.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    nodular cast iron
    ferritizing annealing
    isothermal heat treatment
    żeliwo sferoidalne
    wyżarzanie ferrytyczne
    obróbka cieplna izotermiczna
    Opis:
    The paper deals with the influence of charge composition on microstructure and mechanical properties of synthetic nodular cast irons after casting and after heat treatment (ferritizing annealing and isothermal heat treatment). Chemical composition of individual melts was regulated alternatively by carburizer and ferrosilicon (FeSi) or metallurgical silicon carbide (SiC). The results of experiments show that SiC additive positively influences the microstructure as well as mechanical properties of nodular cast iron, especially in specimens from the melts with higher ratio of steel scrap in the charge.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2017, 1 (6); 31-38
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlling of the logistic processes
    Autorzy:
    Ulewicz, R.
    Vasko, A.
    Klimecka-Tatar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/112027.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    controlling
    logistic
    quality
    cast iron
    logistyka
    jakość
    żeliwo
    Opis:
    The paper presents analysis of the controlling application in logistic processes in the foundry of the cast iron. Controlling of quality was introduced in order to raise efficiency of the foundry of the cast iron management. A comparative method was applied to examinations. Two spheres were compared to managing of the organization: managing the quality by the sphere with the zone of management with finances. The purpose of this action is finding common features when supervising tasks in both these zones.
    Źródło:
    Production Engineering Archives; 2014, 3, 2; 26-30
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of cooling rate on selected structural parameters of advanced cast Ni – base superalloys
    Autorzy:
    Belan, J.
    Vaško, A.
    Kuchariková, L.
    Švecová, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/114811.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Ni-base superalloys
    quantitative metallography methods
    cooling rate
    secondary dendrite arms spacing
    gamma prime evaluation
    carbide evaluation
    heat treatment
    superstopy na bazie niklu
    obróbka cieplna
    rozstaw ramion dendrytu
    rozmiar węglików
    rozkład węglików
    metody metalografii ilościowej
    Opis:
    The Ni – base superalloys are used in aircraft industry for production of aero engine most stressed parts, as are turbine blades or turbine discs. The most stressing factor at Ni – base superalloys loading or working conditions are high temperature range of 700°C up to 850°C and, of course, centrifugal forces, and small vibrations, which produce bending of turbine blades inserted into turbine discs. All these factors cause various forms of microstructure degradation closely connected with decreasing of mechanical properties and shortening of working life as well. From this reason a dendrite arm spacing, carbides size and distribution, morphology, number and value of γ’ - phase are very important structural characteristics for blade lifetime prediction as well as aero engine its self. In this article are used methods of quantitative metallography for evaluation of structural characteristics mentioned above on experimental materials – Ni base superalloys ŽS6K and Inconel IN 738. The high temperature effect represented here by heat treatment at 800°C for 10 hours, and cooling rate, here represented by three various cooling mediums as water, air, and oil, on structural characteristics and application of quantitative methods evaluation with using of SEM are presented in this paper.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2017, 1 (6); 20-30
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Employing various metallography methods at high temperature alloy fatigue tests evaluation
    Autorzy:
    Belan, J.
    Kucharikova, L.
    Vasko, A.
    Chalupova, M.
    Svecova, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/111897.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Ni-base casting and wrought alloys
    gamma prime
    gamma double prime
    gamma solid solution
    light microscopy
    scanning electron microscopy
    SEM
    skaningowa mikroskopia elektronowa
    stopy do obróbki plastycznej
    mikrostruktury nadstopów
    stop
    odlew
    Opis:
    Microstructures of superalloys have dramatically changed throughout the years, as modern technology of its casting or forging has become more sophisticated. The first superalloys have polyedric microstructure consisting of gamma solid solution, some fraction of gamma prime and of course grain boundaries. As demands on higher performance of aero jet engine increases, the changes in superalloys micro-structure become more significant. A further step in microstructure evolution was directionally solidified alloys with columnar gamma prime particles. The latest microstructures are mostly monocrystalline, oriented in [001] direction of FCC gamma matrix. All microstructure changes bring necessity of proper preparation and evaluation of microstructure. Except for the already mentioned structures have gamma double prime and various carbides form can be seen. These structural parameters have mainly positive influence on important mechanical properties of superalloys. The paper deals with a microstructural evaluation of both groups of alloys – cast and as well as wrought. Micro-structure evaluation helps to describe mechanism at various loading and failure of progressive superalloys. Such an example where micro-structure evaluation is employed is fractography of failure surfaces after fatigue tests, which are examples of metallography evaluation de-scribed in this paper as a secondary objective.
    Źródło:
    Production Engineering Archives; 2016, 13, 4; 11-15
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of a pumping unit with consideration of a flexible member in the system
    Autorzy:
    Sapietová, A.
    Sekerka, M.
    Vaško, M.
    Sapieta, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/102969.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    torque
    sensitivity analysis
    multibody systems
    MSC ADAMS
    Opis:
    To achieve a correct function and maximal effectiveness of a pumping unit, it is necessary to correctly design the input dynamic parameters. This paper will present sensitivity analysis, which aims to find appropriate input parameters needed to realize the prescribed work tasks from the point of view of consideration of flexible member in the system.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 31; 119-123
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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