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    Wyświetlanie 1-9 z 9
    Tytuł:
    Microstructure and Mechanical Properties of Lead-Free Solder Joints
    Autorzy:
    Harcuba, P.
    Trško, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402146.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.60.Vz
    67.80.bf
    71.20.Lp
    Opis:
    In this study we investigated the morphology and growth kinetics of the interfacial intermetallic compound layers formed between a Cu substrate and Sn-Cu based solders. We simulated the wave soldering process and subsequent ageing both at different temperatures and reaction times. The near eutectic Sn-0.7Cu alloy and Ni enriched Sn-0.7Cu-0.05Ni alloy were studied. Moreover, we measured the tensile strength of the simulated solder joints and analyzed fracture surfaces.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 750-753
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    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:
    The influence of welded joint quality on safety and reliability in operation
    Autorzy:
    Bokuvka, O.
    Liptakova, T.
    Palcek, P.
    Chalupova, M.
    Trsko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/111736.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    rails
    pipes
    welded joint
    defects
    fractures
    causes
    szyny
    rury
    złącza spawane
    wady
    pęknięcia
    przyczyny
    Opis:
    The quality of welded joint is an assumption of long-term reliability in operation. On the contrary, defective work of bad quality welded joint leads to fracture and crashes of plants. In this paper the authors state that experimentally obtained causes of rails and pipes fractures were the result of bad realization of welded joint. Pores, blowholes, slags, lack of fusion, non-plastic non-metallic particles, cracks, shrink holes were the defects observed in the welded joint area. These defects substantially decreased the load-bearing cross section and the final result was fracture. The railway and high-pressure gas lines out of operation are undesirable and accompanied by considerable financial losses.
    Źródło:
    Production Engineering Archives; 2013, 1, 1; 6-9
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Ultrasonic Control of Ductile Cast Iron Castings by Phased Array Technique
    Autorzy:
    Boháčik, M.
    Mičian, M.
    Koňár, R.
    Trško, L.
    Winczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380009.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ductile cast iron
    technological casting parameters
    ultrasonic testing
    phased array
    żeliwo sferoidalne
    parametry technologiczne
    badania ultradźwiękowe
    Opis:
    The goal of this article is non-destructive ultrasonic testing of internal castings defects. Our task was to cast several samples with defects like porosity and cavities (where belongs mostly shrinkages) and then pass these samples under ultrasonic testing. The characteristics of ultrasonic control of castings are presented in the theoretical part of this article. Ultrasonic control is a volume non-destructive method that can detect internal defects in controlled materials without damaging the construction. It is one of the most widely used methods of volume non-destructive testing. For experimental control were made several cylindrical samples from ferritic grey and ductile cast iron. Because of the form and dispersion of graphite of grey cast iron it was not possible to make ultrasonic records on this casting with probe we used, so we worked only with ductile cast iron. Ultrasonic records of casting control are shown and described in the experimental part. The evaluation of the measurement results and the reliability of the ultrasonic method in castings control is listed at the end of this article.
    Źródło:
    Archives of Foundry Engineering; 2019, 2; 9-14
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of long-term heating on the fatigue properties of low-alloyed cast steel STN 42 2707
    Autorzy:
    Bokuvka, O.
    Jambor, M.
    Novy, F.
    Trsko, L.
    Lago, J
    Powiązania:
    https://bibliotekanauki.pl/articles/111812.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    cast steel STN 42 2707
    long-term heating
    fatigue properties
    Kath
    da/dN = f(Ka)
    staliwa
    własności zmęczeniowe
    pęknięcie zmęczeniowe
    Opis:
    In this paper the authors publish own experimental results of examination of low-alloyed cast steel STN 42 2707 fatigue properties (near- threshold regime of fatigue crack propagation for rates from da/dN =5.6x10-9m.cycle-1 to da/dN =10-12 m.cycle-1 and Kath at da/dN =10-12 m.cycle-1) initial state and after long-term heating (T = 400 °C, t = 4000 hours ≈ 167 days) obtained at high-frequency loading (f ≈ 20 kHz, T= 20 ± 5 °C, R = -1). The long-term heating of material caused decrease of Kath and increase of fatigue crack growth rate in the near-threshold regime; then worse of low-alloyed cast steel STN 42 2707 fatigue properties.
    Źródło:
    Production Engineering Archives; 2016, 12, 3; 30-33
    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:
    The Very High Cycle Fatigue Behaviour of Ti-6Al-4V Alloy
    Autorzy:
    Janeček, M.
    Nový, F.
    Harcuba, P.
    Stráský, J.
    Trško, L.
    Mhaede, M.
    Wagner, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402062.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    46.50.+a
    62.20.M-
    81.40.Np
    Opis:
    The high cycle and very high cycle fatigue properties of the titanium alloy Ti-6Al-4V with a duplex microstructure were investigated at room temperature. High cycle fatigue tests were performed in the range from 10⁴ to 10⁷ cycles by rotating bending at the frequency of 30 Hz. The very high cycle fatigue tests were carried out in the range from 10⁷ to 10¹⁰ cycles in tension-compression on an ultrasonic fatigue testing machine at the frequency of 20 kHz. The stress amplitude was found to decrease with increasing number of cycles in the whole range from 10⁴ up to 10⁹ cycles and only at the highest number of cycles $(N_{F}=10^9)$ the alloy exhibits the fatigue limit of 460 MPa. The detail fractographic analysis was performed to characterize the fatigue failure mechanisms. Both subsurface and surface crack initiation were observed in very high cycle fatigue region. No inclusions, but only local chemical inhomogeneity in microstructure was observed at the locations of subsurface fatigue crack initiation in alpha-grains.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 497-502
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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