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    Wyświetlanie 1-3 z 3
    Tytuł:
    Investigation of Indentation Fracture Toughness (KIC) and Weibull Parameters of 0.25Li2O.2SiO2-0.75BaO.2SiO2 Glass-Ceramic
    Autorzy:
    Ertuğ, B.
    Çetiner, B. R.
    Gökçe, H.
    Erkmen, Z. E.
    Öveçoğlu, M. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/351907.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lithium barium silicate glass-ceramic
    indentation fracture toughness
    hardness
    statistical analysis
    weibull modulus
    Opis:
    In the present study, mechanical properties of 0.25Li2O.2SiO2-0.75BaO.2SiO2 glass-ceramic were investigated. The trans-formations‘ temperatures were determined by DTA instrument. The optimum nucleation temperature was found to be 540°C. This suggested the crystallization temperatures as 675, 720 and 800°C. After carrying out crystallization heat treatments, Vickers indentation test was applied. In order to determine the indentation fracture toughness (KIC), crack half-length ‚c‘ of the samples was measured. To calculate KIC, Young’s modulus, E and the measured hardness, Hv were used. Using KIC and probability of fracture ‚P‘, ln ln[1/(1 − P)] – ln KIC graph was drawn based on the Weibull distribution equation. Consequently, Weibull modulus, ‚m‘ and scale parameter, ‚K0‘ were determined and compared with each other.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 1963-1968
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The method for reliability estimation of the machine elements under low temperature conditions
    Autorzy:
    Vasilyev, A.
    Bakhracheva, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/246045.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    low temperature
    fracture toughness
    ball indentation testing
    intensity of plastic deformation
    Opis:
    The subject considered are the theoretical dependences between parameters in a small scale yielding zone length, and a plastic zone at cave-in spherical indentor. The loadings of a spherical (D=5 mm) indenter in the range from 147 to 11875 N within absolute temperature range 77-293 K were applied. According to this model, fracture conditions occur when the stress sigma z in the centre of ball impression exceeds critical stress of brittle fracture of. Then the indentation energy, corresponding to condition HM =sigma f, where HM and sigma f are the Meyer 's hardness and the material 's critical cleavage fracture stress, was calculated. The comparison of fracture toughness K Ic, and specific energy of plastic deformation on depth of a plastic zone at introduction spherical indentor up values reveals linear relation-ships KIc(up) for all steels in all the investigated temperature range. For the purposes of non-destructive Sk estimation, the relation-ship between S k and misses stress sigma i, in the centre of impression at the temperature 77 K was established. At last fracture toughness values can be calculated from the single unified equation for all investigated steels. The model proposed can be used for predicting the cracking resistance of the machine elements in a low temperature range.
    Źródło:
    Journal of KONES; 2009, 16, 1; 513-517
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Analysis of Mechanical Properties of WC-based Cermet Coatings Sprayed by HVOF onto AZ31 Magnesium Alloy Substrates
    Autorzy:
    Jonda, Ewa
    Łatka, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/2024046.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mechanical properties
    microstructure
    fracture toughness
    indentation test
    cermet coating
    HVOF spraying
    magnesium alloy AZ31
    Opis:
    Magnesium alloys are very interesting engineering materials due to their very high strength to density ratio (the best among metallic alloys). However, because of low hardness as well as low resistance against erosion, abrasion and corrosion, their applications in the industry is very limited. In order to improve mechanical performances, deposition of hardening coating by thermal spraying was proposed. In this work, the WC-based coatings with different binder (Co or Ni) and co-hardening additives (Cr or Cr3C2) manufactured by high velocity oxy-fuel (HVOF) were studied. These coatings were deposited onto AZ31 magnesium alloy. The crucial problem is obtaining good-adhered coating without damage the substrate, because of relatively low temperature resistance of magnesium alloys (about 300 °C). To solve this problem, HVOF method, which is low temperature and high velocity, was proposed. Also an important role plays process parameters (e.g. spray distance, fuel medium, type of nozzle). The goal of the study was to compare three types of cermet coatings manufactured from commercially available powders (WC-Co, WC-Co-Cr and WC-Cr3C2-Ni) in terms of their microstructure features, microhardness, instrumented indentation and fracture toughness. Results revealed that selected process parameters made it possible to obtain well-adhered coating with good fulfillment of the surface unevenness of the AZ31 substrate. The most noticeable effect was influence of cobalt matrix on higher hardness (1.4 – 1.6 GPa) and Young modulus (330 – 340 GPa) of deposited coatings in compare to the nickel matrix ones (1.2 GPa and 305 GPa, respectively). The same trend was observed in case of fracture toughness, c.a. 6.5 MPa·m1/2 for Co-matrix and 4.9 MPa·m1/2 for Ni-matrix
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 2; 57-64
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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