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    Wyświetlanie 1-6 z 6
    Tytuł:
    Strength of threaded connections additively produced from polymeric materials
    Wytrzymałość połączeń gwintowych wytwarzanych przyrostowo z materiałów polimerowych
    Autorzy:
    Dziubek, Tomasz
    Budzik, Grzegorz
    Kawalec, Andrzej
    Dębski, Mariusz
    Turek, Paweł
    Oleksy, Mariusz
    Paszkiewicz, Andrzej
    Poliński, Przemysław
    Kochmański, Łukasz
    Kiełbicki, Mateusz
    Józwik, Jerzy
    Kuric, Ivan
    Cebulski, Józef
    Powiązania:
    https://bibliotekanauki.pl/articles/2200485.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    additive manufacturing
    polymers
    screw strength
    tensile stresses
    shear stresses
    wytwarzanie przyrostowe
    polimery
    wytrzymałość śruby
    naprężenia rozciągające
    naprężenia ścinające
    Opis:
    The article presents the results of strength tests of screw-nut threaded connections made of polymeric materials such as: ABS, PLA, PET-G and acrylic resin. In order to make physical models, three 3D printing techniques were used: Fused Deposition Modeling (FDM), Fused Filament Fabrication (FFF), and PolyJet. The tests took into account the stresses caused by the axial force generated when the bolt is screwed into the nut or other structural element. Due to the complexity of the issue, the presented studies are only a starting point for further research.
    W artykule przedstawiono wyniki badań wytrzymałości połączeń gwintowych śruba-nakrętka wykonanych z materiałów polimerowych takich, jak: ABS, PLA, PET-G i żywicy akrylowej. Do wykonania modeli fizycznych stosowano trzy techniki druku 3D: FDM, FFF i PolyJet. W badaniach uwzględniono naprężenia spowodowane działaniem siły osiowej powstającej podczas wkręcania śruby w nakrętkę lub inny element konstrukcyjny. Ze względu na złożoność zagadnienia, przedstawione badania stanowią punkt wyjścia do dalszych badań.
    Źródło:
    Polimery; 2022, 67, 6; 261--270
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Drilling resistance : A method to investigate bone quality
    Autorzy:
    Lughmani, W. A.
    Farukh, F.
    Bouazza-Marouf, K.
    Ali, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/306405.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chirurgia ortopedyczna
    wiercenie
    gęstość mineralna kości
    jakość kości
    bone drilling
    orthopaedic surgery
    screw pull-out strength
    bone mineral density
    bone quality
    Opis:
    Purpose: Bone drilling is a major part of orthopaedic surgery performed during the internal fixation of fractured bones. At present, information related to drilling force, drilling torque, rate of drill-bit penetration and drill-bit rotational speed is not available to orthopaedic surgeons, clinicians and researchers as bone drilling is performed manually. Methods: This study demonstrates that bone drilling force data if recorded in-vivo, during the repair of bone fractures, can provide information about the quality of the bone. To understand the variability and anisotropic behaviour of cortical bone tissue, specimens cut from three anatomic positions of pig and bovine were investigated at the same drilling speed and feed rate. Results: The experimental results showed that the drilling force does not only vary from one animal bone to another, but also vary within the same bone due to its changing microstructure. Drilling force does not give a direct indication of bone quality; therefore it has been correlated with screw pull-out force to provide a realistic estimation of the bone quality. A significantly high value of correlation (r 2 = 0.93 for pig bones and r 2 = 0.88 for bovine bones) between maximum drilling force and normalised screw pull-out strength was found. Conclusions: The results show that drilling data can be used to indicate bone quality during orthopaedic surgery.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 1; 55-62
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue strength of screw joints at loading variable
    Autorzy:
    Nieoczym, A.
    Gardyński, L.
    Krzysiak, Z.
    Bartnik, G.
    Samociuk, W.
    Beer-Lech, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1396459.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    screw joints
    fatigue strength
    heat treatment
    Opis:
    In the article was described an influence of the construction of screw joint on the strength at loading variable. Relation of the type of material of the bolt was described to strength from the technology of making thread. Presented findings of cracking of double – nutted bolts at low – cycles loading.
    Źródło:
    Advanced Technologies in Mechanics; 2015, 2, no. 2 (3); 28-36
    2392-0327
    Pojawia się w:
    Advanced Technologies in Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of resistance to axial withdrawal of screws embedded in locally reinforced MDF
    Autorzy:
    Sydor, M.
    Wolpiuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/52610.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    screw
    universal screw
    withdrawal
    strength
    fibreboard
    medium-density fibreboard
    local modification
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2016, 59, 196
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pullout evaluation of sawbone experiment in different types of pedicle screws combined with bone cement augmentation for severe osteoporotic spine
    Autorzy:
    Yang, S.-C.
    Liu, P.-H.
    Tu, Y.-K.
    Powiązania:
    https://bibliotekanauki.pl/articles/307271.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    osteoporoza
    kości
    wytrzymałość
    osteoporosis
    bone cement augmentation
    cannulated pedicle screw
    sawbone
    pullout strength
    Opis:
    Purpose: The conventional screw is unable to provide enough screw-bone interface strength for osteoporotic cencellous bone, and complications resulting from loosening or failure of the implants remain a significant clinical problem. Hence, the purpose of this study is to investigate pullout strength and energy in three types of the pedicle screws, including conventional solid pedicle screw, cannulated pedicle screw, and cannulated pedicle screw with a central pin, using osteoporotic sawbone test block with different bone cement volumes through pullout force testing. Methods: The control group (n = 15) of the osteoporotic sawbone test block includes groups A, B, and C to reflect three types of the pedicle screws without bone cement augmentation. The cemented group (n = 45) of the osteoporotic sawbone test block includes groups D1, D2, D3, E1, E2, E3, F1, F2, and F3 to reflect three types of the pedicle screws with PMMA bone cement of 2, 3, and 4 mL augmentation. Results: The results showed that the pullout strength and energy in the cemented group were significantly larger than that in the control group. Moreover, the best performances of the pullout strength and energy in the cemented group were evidenced obviously in the case of cannulated pedicle screw with a central pin with 4 mL bone cement augmentation. Conclusions: This study concludes that cement argumentation in the cannulated pedicle screw with a central pin can increase a pullout strength of pedicle screw for severe osteoporotic patients while bone cement of injective volume is limited.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 55-64
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of pullout strength in different designs of pedicle screws for osteoporotic bone quality using finite element analysis
    Autorzy:
    Yang, Shih-Chieh
    Liu, Pao-Hsin
    Tu, Yuan-Kun
    Powiązania:
    https://bibliotekanauki.pl/articles/306201.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    osteoporoza
    cement
    FEM
    osteoporosis
    cement augmentation
    pedicle screw
    pullout strength
    finite element analysis
    Opis:
    The purpose of this study was to investigate pullout strength of three types of pedicle screws with and without cement augmentation in osteoporotic bone using finite element analysis. Methods: Twelve 3D finite element models were created to investigate the effect of pullout strength when comparing between pedicle screw types and bone cement clouds. The bottom side of bone block model was constrained and U-shape head was applied 1 mm in direction of longitudinal axis of pedicle screw to perform pullout resistance. The material properties of the FEA was set as linear elastic, homogenous, isotropic condition. The element sensitivity of convergence testing has been performed and variation of the sequential analytical results was less than 3%. Results: The results showed that the maximum total reaction force (133.8 N) was detected in the model of cannulated pedicle screw combined with a central pin with 4 ml cement augmentation, but, in contrast, the minimum total reaction force (106.8 N) was discovered in the model of cannulated pedicle screw without cement. A strong relationship (r = 0.9626) is found in comparison with the biomechanical results between pullout strength of sawbone testing and reaction forces of the FEA. Conclusions: The study concludes that the cannulated pedicle screw can not only provide an inner guider for cement flow and increase bending resistance (deflection effect) when a central pin is selected, but also can improve the pullout strength in the osteoporotic bone to add cement augmentation. The design of the cannulated pedicle screw is suggested for poor bone quality to change pullout failure.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 3; 57-66
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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