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    Wyświetlanie 1-3 z 3
    Tytuł:
    Numerical analysis of stress distribution generated in spherical polyethylene inserts by knee joint endoprotheses’ sleds
    Autorzy:
    Nabrdalik, Marcin
    Sobociński, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/779682.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    polyethylene UHMWPE
    FEM
    endoprosthesis of knee joint
    Opis:
    The paper presents analysis of stress distribution in the friction node of knee joint endoprosthesis where sleds are made of various titanium alloys and CoCrMo cooperate with spherical polyethylene inserts. Currently used titanium alloys consists of Nb, Ta, Zr or Mo and with lesser value of Young’s modulus than Ti6Al4V alloy, or steel CoCrMo, which significantly varies from other metal materials. The obtained results make it possible to indicate the “weak points” of the accepted solution, and thus counteract the subsequent effects resulting from premature wear of endoprosthesis elements. The analysis was conducted with numerical method of ADINA System 8.6. The Finite Elements Method allowed to compute and present stress distribution quickly in all elements of the model.
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 2; 1-5
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polyurethanes from the crystalline prepolymers resistant to abrasive wear
    Autorzy:
    Domańska, Agata
    Boczkowska, Anna
    Izydorzak-Woźniak, Marta
    Jaegermann, Zbigniew
    Grądzka-Dahlke, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/778795.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    polyurethane
    crystalline prepolymer
    abrasive wear
    adhesion
    friction coefficient
    endoprosthesis
    Opis:
    The research aimed at the selection of polyurethanes synthesized from poly(tetramethylene ether) glycol (PTMEG), as well as from two different isocyanates 4,4′-methylenebis(cyclohexyl)isocyanate (HMDI) and 4.4′-methylenebis(phenyl isocyanate) (MDI) in order to obtain polyurethane with increased resistance to abrasive wear and degradation for bio-medical application. Polyurethanes were fabricated from crystalline prepolymers extended by water. The paper presents preliminary results on polyurethane surface wettability, friction coeffi cient for different couples of the co-working materials such as polyurethane–polyurethane, polyurethane–titanium alloy, polyurethane–alumina, in comparison to commonly used polyethylene–titanium alloy. Shear strength of polyurethane–alumina joint, as well as viscosity of prepolymers were also measured. The values of friction coeffi cient were compared to literature data on commercially available polyurethane with the trade name Pellethane. Polyurethanes obtained are characterized by low abrasive wear and low friction coeffi cient in couple with the titanium alloy, what makes them attractive as possible components of ceramic-polymer endoprosthesis joints.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 4; 14-20
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polyurethanes used in the endoprosthesis of joints
    Autorzy:
    Domańska, A.
    Boczkowska, A.
    Izydorzak, M.
    Jaegermann, Z.
    Kurzydłowski, K. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779310.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    poliuretany
    biodegradacja
    ścieranie
    endoprotezy stawów
    polyurethane
    biodegradation
    abrasive wear
    joint endoprosthesis
    Opis:
    The aim of the studies presented in this paper was the selection of the polyurethanes synthesized from different substrates in order to obtain i) ceramic - biodegradable polymer composite and ii) polyurethane resistant to abrasive wear. The polyurethanes were obtained from the crystalline prepolymers extended by water, because it may have a beneficial effect on the toxicity of the material. The properties of PUs were investigated using infrared spectroscopy, thermogravimetry, differential scanning calorimetry and scanning electron microscopy. In all the tested polyurethanes the peak from the reactive -NCO groups was not observed, which indicates that all the substrates are fully reacted. Such polyurethanes are characterized by interesting properties with the perspective use as components of ceramic-polymer joints endoprosthesis. The designed endoprosthesis should fulfill at least three functions: load bearing function (ceramic core), fastening and stabilizing endoprosthesis to the bone (composite ceramics – biodegradable polymer) and tribologic function allowing mating with parts of the prosthesis (polyurethane layer resistant to abrasive wear).
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 3; 10-14
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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