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    Wyświetlanie 1-9 z 9
    Tytuł:
    A prediction method for load distribution in threaded connections
    Autorzy:
    Zhang, D.
    Gao, S.
    Niu, S.
    Liu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/949123.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    load distribution
    threaded connections
    finite element analysis
    Opis:
    A new method has been developed for predicting the load distribution along the thread portion of a bolt and nut connection. The calculated results were validated by comparison with three-dimensional finite element analysis and Yamamoto’s method. It was shown that the load distribution predicted by the model in this paper was in good agreement with the results from finite element model, and the load ratio on the first thread by the prediction model and finite element model was slightly larger than the results from Yamamoto’s method. In addition, the results of calculation and finite element analysis indicated that the decreasing of the lead angle could improve the load distribution, the increasing of the length of thread engaged could significantly improve the load bearing capacity of the first thread, and the adopting of a material with low stiffness for the nut with respect to the bolt could improve the load distribution slightly.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 157-168
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ability of Joining Composite Structures with Metal by Riveting
    Autorzy:
    Godzimirski, Jan
    Arkuszyńska, Angelika
    Powiązania:
    https://bibliotekanauki.pl/articles/2073840.pdf
    Data publikacji:
    2022
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    composites
    mechanical fasteners
    plain rivets
    blind threaded rivets
    Opis:
    The technology of repairing the composite coverings of the MiG-29 airframe provides for the possibility of repairing with the use of metal battens, connected with the composite cover by riveting, with the use of metal washers protecting the composite against damage during rivet upsetting. Tests were carried out to check the possibility of replacing the composite covering repairs with solid rivets with blind rivets, which would eliminate the necessity for the troublesome disassembly and assembly of the damaged covering. The conducted research shows that the threaded blind titanium rivets meet the requirements to be substitutes for solid rivets. The performed numerical calculations show that in riveted joints, an important role in the load transfer is played by the friction forces between the joined elements, and the value of these forces depends on the pressure of the head and the tab. Titanium blind threaded rivets provide higher pressure than cold-headed ones.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2022, 13, 2 (48); 9--24
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The issue of determining the geometric position deviation of the threaded holes
    Autorzy:
    Martikáň, P.
    Drbúl, M.
    Holubják, J.
    Mrázik, J.
    Joch, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/957939.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    coordinate measuring systems
    location gages
    position deviation
    threaded holes
    Opis:
    The present article analyzes the specific measurement strategies (techniques) of contact measurement that are used to determine the position deviation of the threaded holes using 3D coordinate measuring system. Furthermore, there are analyzed direct and indirect (location gages) measurement techniques to determine position of the threaded holes and results of the measurements.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 32; 47-52
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geometrical Accuracy of Threaded Elements Manufacture by 3D Printing Process
    Autorzy:
    Budzik, Grzegorz
    Dziubek, Tomasz
    Kawalec, Andrzej
    Turek, Paweł
    Bazan, Anna
    Dębski, Mariusz
    Józwik, Jerzy
    Poliński, Przemysław
    Kiełbicki, Mateusz
    Kochmański, Łukasz
    Oleksy, Mariusz
    Cebulski, Józef
    Paszkiewicz, Andrzej
    Kuric, Ivan
    Powiązania:
    https://bibliotekanauki.pl/articles/2201896.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    additive manufacturing
    surface roughness
    computer measurement system
    threaded elements
    Opis:
    Additive processes allow for almost any manufacturing of screw-threaded joint elements. However, this requires knowledge of the geometrical relationships of a threaded itself and the strength of materials from which the screw-threaded joint is made. Thanks to the development of research models and conducting tests related to dimensional accuracy and surface roughness, it was possible to test the models made by MEX process of ABS-M30, PLA, ABS, PETG materials, and PolyJet process from RGD720 polymer material.In the case of measurements carried out on the MarSurf XC20 system, the internal and external thread profile was obtained.Measurements of the surface roughness of the printed models were made using the Taylor Hobson TalyScan 150 profilometer. Based on the obtained surface, following the ISO 25178-2 standard, selected parameters were determined.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 1; 35--45
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Aspects to Simplify Concurrent Programming
    Autorzy:
    Negacz, M
    Hnatkowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/384103.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Simplify Concurrent Programming
    multi-threaded programs
    concurrent programming
    Opis:
    Developers who create multi-threaded programs must pay attention to ensuring safe implementations that avoid problems and prevent introduction of a system in an inconsistent state. To achieve this objective programming languages offer more and more support for the programmer by syntactic structures and standard libraries. Despite these enhancements, multi-threaded programming is still generally considered to be difficult. The aim of our study was the analysis of existing aspect oriented solutions, which were designed to simplify concurrent programming, propose improvements to these solutions and examine influence of concurrent aspects on complexity of programs. Improved solutions were compared with existing by listing differing characteristics. Then we compared classical concurrent applications with their aspect oriented equivalents using metrics. Values of 2 metrics (from 7 considered) decreased after using aspect oriented solutions. Values of 2 other metrics decreased or remained at the same level. The rest behaved unstably depending on the problem. No metric reported increase of complexity in more than one aspect oriented version of program from set. Our results indicate that the use of aspects does not increase the complexity of a program and in some cases application of aspects can reduce it.
    Źródło:
    e-Informatica Software Engineering Journal; 2014, 8, 1; 27-37
    1897-7979
    Pojawia się w:
    e-Informatica Software Engineering Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface based cohesive behavior implementation for the strength analysis of glued-in threaded rods in Glulam
    Autorzy:
    Gečys, T.
    Šaučiuvėnas, G.
    Ustinovichius, L.
    Miedzialowski, C.
    Sulik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/200957.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    glued-in rods
    epoxy glue
    finite element modelling
    threaded steel rod
    Opis:
    The paper presents the analysis of strength and stiffness of metric threaded steel rods glued in glulam obtained by using two different gluing methods. The first method is used when the threaded steel rod is glued into a groove larger than the rod’s diameter, while the second method is applied when the diameter of the groove is smaller than the diameter of the threaded steel rod. The steel rod is covered with glue before it is inserted into the smaller diameter groove. The first method investigates the 2-mm-thick glue-line, while the second method analyses the contact when the groove’s diameter is 2 mm smaller than the outer diameter of the rod. Epoxy-type resin is used for both gluing methods. Different gluing methods present different interactions between the steel rod and glulam which result in different failure modes. The second method presents a plastic failure between the steel rod and glulam caused by the local compression and shear of glulam. The presented studies are made using metric threaded steel rods of diameters M12 and M16. In total, 20 specimens are experimentally tested in tension-to-tension tests performed according to EN 26891. The interaction between glulam and glued steel rods is also investigated using the 3D finite element modelling. The results obtained using the proposed 3D finite element model with different contact conditions between steel and glulam and the failure criterion for timber shear are well in line with the experimental findings.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1149-1157
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Moduł obliczeniowy generatora połączeń gwintowych w Inventorze
    Calculation module of thread connection generator in Inventor
    Autorzy:
    Maciejczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/310732.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    Inventor
    połączenia gwintowe
    połączenie śrubowe
    wspornik
    model obliczeniowy
    threaded connections
    screw connection
    cantilever
    calculation model
    Opis:
    W artykule przedstawiono analizę doboru śrub wspornika z wykorzystaniem klasycznych, analitycznych metod obliczeniowych oraz z wykorzystaniem generatora Inventora. Omówiono działanie i funkcjonalność modułu obliczeniowego generatora. Wskazano na jego niedoskonałości, zastosowane uproszczenia oraz dostrzeżone błędy. Oceniono jego przydatność w procesie konstrukcji.
    The article presented an analysis of the selection of bracket screws using classical, analytical calculation methods and using the Inventor generator. The operation and functionality of the generator calculation module are discussed. Its imperfections, simplifications and perceived errors were pointed out. Its usefulness in the construction process was assessed.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 6; 573-576, CD
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental analysis of insertion torques and forces of threaded and press-fit acetabular cups by means of ex vivo and in vivo measurements
    Autorzy:
    Vogel, D.
    Rathay, A.
    Teufel, S.
    Ellenrieder, M.
    Zietz, C.
    Sander, M.
    Bader, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/307285.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    panewka
    gwintowanie
    kość
    kość syntetyczna
    insertion force
    insertion torque
    acetabular cup
    press-fit
    threaded
    synthetic bone
    Opis:
    In THA sufficient primary implant stability is the precondition for successful secondary stability. Industrial foams of different densities have been used for primary stability investigations. The aim of this study was to analyse and compare the insertion behaviour of threaded and press-fit cups in vivo and ex vivo using bone substitutes with various densities. Methods: Two threaded (Bicon Plus®, Trident® TC) and one press-fit cup (Trident PSL®) were inserted by orthopaedic surgeons (S1, S2) into 10, 20 and 31 pcf blocks using modified surgical instruments allowing measurements of the insertion forces and torques. Furthermore, the insertion behaviour of two cups were analysed intraoperatively. Results:Torques for the threaded cups increased while bone substitute density increased. Maximum insertion torques were observed for S2 with 102 Nm for the Bicon Plus® in 20 pcf blocks and 77 Nm for the Trident® TC in 31 pcf blocks which compares to the in vivo measurement (85 Nm). The average insertion forces for the press-fit cup varied from 5.2-6.8 kN (S1) and 7.2-11.5 kN (S2) ex vivo. Intraoperatively an average insertion force of 8.0 kN was determined. Conclusions: Implantation behaviour was influenced by acetabular cup design, bone substitute and experience of the surgeon. No specific density of bone substitute could be favoured for ex vivo investigations on the implantation behaviour of acetabular cups. The synthetic bone blocks of high density (31 pcf) led to problems regarding cup orientation and seating. Therefore, bone substitutes used should be critically scrutinized in terms of the comparability to the in vivo situation.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 3; 155-163
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stanowiskowe badania procesu wkręcania łączników gwintowych
    Workplace research on the process of driving threaded fastener
    Autorzy:
    Nieoczym, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/252380.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Naukowo-Wydawniczy TTS
    Tematy:
    łącznik gwintowy
    wkręcanie śrub
    moment skręcający
    moment tarcia
    siła osiowa
    threaded fastener
    driving screws
    turning moment
    moment of friction
    axial force
    Opis:
    W artykule przedstawiono wyniki badań procesu wkręcania śrub oraz dokonano analizy statystycznej zarejestrowanych wartości momentu skręcającego, momentu tarcia oraz siły osiowej. Dodatkowo zaprezentowano wyniki zmian tych wartości pod wpływem różnych powłok ochronnych śrub oraz obecności czynnika smarnego. Scharakteryzowano stanowisko badawcze oraz zaprezentowano algorytmy sterujące jego pracą.
    In the article findings of the process of driving screws were presented as well as they caused a statistical analysis of registered values of the turning moment, the moment of the friction and axial force. Additionally results of changes of these values were presented under the influence of different protective coatings of screws and the presence of the spreadable factor. A research position was characterized as well as algorithms controlling his work were expressed.
    Źródło:
    TTS Technika Transportu Szynowego; 2012, 9; 393-400, CD
    1232-3829
    2543-5728
    Pojawia się w:
    TTS Technika Transportu Szynowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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