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    Wyświetlanie 1-11 z 11
    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:
    Analysis of the Corrosion Resistance of Aircraft Structure Joints with Double-Sided Rivets and Single-Sided Rivets
    Autorzy:
    Kamińska, Paulina
    Synaszko, Piotr
    Ciężak, Patryk
    Dragan, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2105143.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    rivet joints
    double-sided rivets
    one-sided rivets
    corrosion
    accelerated ageing tests
    Opis:
    An important factor having a negative impact on the technical condition of aircraft structure elements is the adverse effect of the atmosphere, which causes formation of corrosion in aircraft structures, especially in riveted lap joints. The electric potential difference between the sheet material and the rivet, in the presence of humid air, may cause electrochemical corrosion. The paper presents specimens that imitate the repair on the Mi-24 helicopter with the use of blind rivets in places where solid double-sided rivets could not be used.The aim of the research was to assess the corrosion resistance of lap joints with the use of single-sided and double-sided rivets. The analysis of corrosion resistance was carried out based on accelerated aging tests in a salt spray chamber. The salt chamber tests were aimed at determining the changes taking place in the specimens exposed to the marine environment. In the course of periodic observations changes in the mass of the specimens and in the form of corrosion losses were recorded. These activities were aimed at determining whether the exposure of specimens in the salt chamber causes electrochemical corrosion or pillowing. In addition, the specimens were subjected to static strength tests to assess the effect of corrosion on the strength properties of riveted joints.
    Źródło:
    Fatigue of Aircraft Structures; 2020, 12; 57--68
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of selected contact materials used in low-voltage relays
    Autorzy:
    Książkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/378085.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    contact materials
    relays
    rivets
    Opis:
    Low-voltage relays are widely used in many areas of electrical applications. There are used for such applications as protection, signalization or control of electrical installations. There all are similar in many ways were it comes to construction and operating principles. However for different applications different contact materials must be used. There are many materials used for contacts in electrical appliances. In this paper contact materials used especially in low-voltage electromechanical relays are described. Their electrical and mechanical properties are characterised.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 82; 207-212
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Selected Rivet and Riveting Instructions
    Autorzy:
    Kaniowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97986.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    riveted joints
    rivets
    riveting parameters
    riveting instructions and standards
    Opis:
    Sheet metal parts are widely used in airframes. Most sheet metal parts used in aircraft assembly are joined using rivets. A number of riveting parameters directly influence fatigue properties of a structure. These include a rivet length, driven head diameter, tolerance of a rivet hole and a rivet shank diameter, and a protective layer among others. Unfavourable selection or change of these parameters can lead to stress concentrations and early crack nucleation. Crack growth can cause failure of a whole structure. The selection of the riveting process parameters is usually described in a company’s internal instruction (process specifications). Some parameters can be defined in an aircraft's technical specifications. Riveting instructions among other production documentation are part of a company's closely guarded know-how. The author obtained access to two riveting instructions used in Poland and three such documents used in western Europe. The author was permitted to publish the comparison of the parameters from these documents but he is not supposed to reveal any other information. For the reasons stated above, the following cryptonyms were used in the article: Poland-1, Poland-2, West-1, West-2 and West-3. The quality of a joint also depends on rivets parameters that are defined in rivets standards. For this reason, selected rivets defined in the Polish and Russian industry standards as well as western standards are compared in this paper. Tolerances of a rivet and a hole diameter, clearances between a rivet and a hole, rivet lengths anticipated for driven head formation as well as driven head dimensions are taken into account.
    Źródło:
    Fatigue of Aircraft Structures; 2014, 6; 39-62
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contact materials used in low voltage electrical relays
    Autorzy:
    Książkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/97273.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    contact materials
    relays
    rivets
    Opis:
    Low-voltage relays are widely used in many areas of electrical applications. There are used for such applications as protection, signalization or control of electrical installations. There all are similar in many ways were it comes to construction and operating principles. However for different applications different contact materials must be used. There are many materials used for contacts in electrical appliances. In this paper contact materials used especially in low-voltage electromechanical relays are described. Their electrical and mechanical properties are characterised.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 300-309
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Eksperymentalna i numeryczna analiza procesu instalacji nitu
    Experimental and numerical analysis of a rivet installation process
    Autorzy:
    Korbel, A.
    Szymczyk, E.
    Skorupa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/211311.pdf
    Data publikacji:
    2013
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    połączenia nitowe
    nity lotnicze
    siła zakuwania nitu
    ekspansja otworu nitowego
    naprężenia resztkowe
    MES (metoda elementów skończonych)
    riveted joints
    aircraft rivets
    squeeze force
    hole expansion
    residual stresses
    FEM
    Opis:
    W artykule przedstawiono wyniki badań eksperymentalnych oraz analiz numerycznych MES związane z procesem zakuwania nitu. Analizie poddano stosowane w polskim przemyśle lotniczym nity z łbem kulistym z materiału PA24 oraz blachy ze stopu D16CzATW. Zbadano, jak siła nitowania wpływa na charakterystyczne wymiary zakuwki oraz ekspansję otworu nitowego, a następnie uzyskane wyniki porównano z wynikami analiz MES. Ponieważ dotychczas stosowane metody pomiaru ekspansji otworu mogą być obarczone błędem, opracowano własną metodę pomiaru, cechującą się większą dokładnością. Zbadano, jak przyjęty w analizach MES model materiału nitu wpływa na jakość otrzymywanych wyników. Wykazano, że wierne odtworzenie procesu nitowania w MES wymaga odpowiedniego zdefiniowania modeli materiałowych stosowanych w tych analizach. Ponadto określono wpływ siły zakuwania nitu na rozkład oraz wielkość resztkowych naprężeń promieniowych i obwodowych wokół otworu nitowego.
    Experimental results and numerical FE analysis related to the riveting process are considered in the paper. The research has focused on the round head rivet and D16CzATW sheet material used by Polish aircraft manufacturers. The effect of rivet squeeze force on the rivet driven head dimensions and rivet hole expansion was experimentally investigated and the results were compared with the FE results. In view of an insufficient accuracy of hole expansion measurement methods used so far, a novel more accurate measurement technique developed by the present authors has been applied. FE results were obtained for various models of the rivet material. It was shown that an adequate numerical modelling of the rivet installation is conditioned by appropriate assumptions about the constitutive characteristics of the rivet material. The impact of the squeeze force on distributions and values of residual stresses generated by riveting was also determined.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2013, 62, 2; 181-200
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elementy obuwia odnalezione na ulicy Kościuszki w Rzeszowie
    Elements of footwear found at Kościuszko Street in Rzeszów
    Autorzy:
    Gorazd-Dziuban, Paulina
    Powiązania:
    https://bibliotekanauki.pl/articles/2053544.pdf
    Data publikacji:
    2022-06-03
    Wydawca:
    Uniwersytet Rzeszowski. Instytut Archeologii Uniwersytetu Rzeszowskiego. Muzeum Okręgowe w Rzeszowie
    Tematy:
    elements of footwear
    shoe taps
    rivets
    awls
    the Middle Ages
    Modern Period
    Opis:
    Kościuszko Street in Rzeszów, leading from the market square to the main promenade, is considered to be one of the oldest streets in the city. In the late Middle Ages and the early Modern Period, it connected the city centre with the parish church, where the first owners of Rzeszów rest. In the course of the archaeological watching brief conducted during the reconstruction of the street, it was possible to collect a significant number of artefacts related to the everyday life of the city (e.g. tiles, glass objects, coins, horseshoes). The subject matter of this article is a selection of footwear pieces and the items directly related to them. The research gives an opportunity to get to know better the material culture and tastes of the inhabitants of Rzeszów.
    Źródło:
    Materiały i Sprawozdania Rzeszowskiego Ośrodka Archeologicznego; 2021, 42; 163-175
    0137-5725
    Pojawia się w:
    Materiały i Sprawozdania Rzeszowskiego Ośrodka Archeologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Validation of Riveting Process Fe Simulation
    Autorzy:
    Wronicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/97823.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    rivets
    riveting process modelling
    experimental validation
    Opis:
    Rivets are critical areas in metal airframes from the fatigue point of view. Fatigue behaviour of riveted joints depends strongly on the residual stress system around the rivet holes. The both most convenient and most common method of determining these stresses is the Finite Element (FE) analyses. The validation of models used is necessary to ensure the reliability of results. This paper presents the validation process of the riveting FE simulations for the universal and the countersunk rivets. At first, the material model of the rivets was validated with the use of the force-displacement curves of the press stamp obtained experimentally. Because of the displacement measurement method, it was necessary to take into account the flexibility of the stand. After that, good correlation between the numerical simulations and the experiment was obtained for both rivet types. At the second stage, strains around driven heads measured with the use of strip gauge patterns were compared with the results of the FE simulations. Quite good correlation was obtained for the countersunk rivet. In the case of the universal rivet, the numerical results are significantly higher values than the measured ones. Differences in correlation of the experiments and FE simulations for the analysed rivet types probably result from material differences of the rivets.
    Źródło:
    Fatigue of Aircraft Structures; 2018, 10; 63-72
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of fatigue life of riveted joints in helicopter airframes
    Autorzy:
    Rośkowicz, Marek
    Godzimirski, Jan
    Jasztal, Michał
    Gąsior, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1841763.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    riveted joints
    hybrid joint
    fatigue life
    titanium driven blind bolts with pin
    ordinary mushroom head rivets
    Opis:
    Using original cold-formed rivets in repairs of airframes of helicopters is difficult due to no access to inside parts of the airframe. Thus, the main aim of the study was to investigate the possibility to use the blind rivets or hybrid joints by verification the fatigue performance of such joints that must be better than with original rivets. Riveted and hybrid joints have been experimentally tested under static and fatigue loads. Furthermore, numerical calculations of stress distribution for strapped joint have been conducted. The test results covered fatigue life of lap joints and models of repaired airframe sheets using ordinary mushroom head rivets ref. 3558A-4-10, titanium driven blind bolts with pin, ref. MBF2110AB-05-150 and modified hybrid joints. Using titanium driven blind bolts with pin instead of ordinary hammer-bucked rivets, can improve the fatigue life of element made of aluminum alloy AW 2024T3. There are advantages of replacing riveted joints with modified hybrid (rivet & adhesive) joints in threefold increase in fatigue life of repaired airframe structures.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 1; 165-175
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of fatigue life of riveted joints in helicopter airframes
    Autorzy:
    Rośkowicz, Marek
    Godzimirski, Jan
    Jasztal, Michał
    Gąsior, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1841792.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    riveted joints
    hybrid joint
    fatigue life
    titanium driven blind bolts with pin
    ordinary mushroom head rivets
    Opis:
    Using original cold-formed rivets in repairs of airframes of helicopters is difficult due to no access to inside parts of the airframe. Thus, the main aim of the study was to investigate the possibility to use the blind rivets or hybrid joints by verification the fatigue performance of such joints that must be better than with original rivets. Riveted and hybrid joints have been experimentally tested under static and fatigue loads. Furthermore, numerical calculations of stress distribution for strapped joint have been conducted. The test results covered fatigue life of lap joints and models of repaired airframe sheets using ordinary mushroom head rivets ref. 3558A-4-10, titanium driven blind bolts with pin, ref. MBF2110AB-05-150 and modified hybrid joints. Using titanium driven blind bolts with pin instead of ordinary hammer-bucked rivets, can improve the fatigue life of element made of aluminum alloy AW 2024T3. There are advantages of replacing riveted joints with modified hybrid (rivet & adhesive) joints in threefold increase in fatigue life of repaired airframe structures.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 1; 165-175
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of The Degree of the Rivet Hole Sizing on the Fatigue Life
    Autorzy:
    Lipski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/97917.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    fatigue tests
    rivets
    holes
    fatigue life
    Opis:
    The paper presents the results of fatigue tests of specimens with sized rivet holes. Samples for tests were made of 0.05'' (1.27 mm) thick non-clad plates of aluminium grade 2024-T3. Rivet holes were prepared assuming that they shall be used for 3 mm nominal diameter snap head rivets for aviation-related purposes. Different sizing degrees were achieved by drilling holes of different diameters in the samples followed by the sizing process using a sizing mandrel of the same diameter of 3.15 mm. Holes in the test samples were drilled using special device ensuring appropriate quality and repeatability of the holes. Five different sizing degrees were achieved be means of five drills of different diameters. Samples with holes of varying degrees of sizing were tested under constant amplitude sinusoidal loading conditions (cycle asymmetry coefficient R = 0) at the load frequency of 5 Hz. The study was conducted at three levels of maximum stress in the cycle. Fatigue life test results were presented in the form of fatigue diagrams (regression lines) determined in the bi-logarithmic coordinate system log N, log Smax. The results of the fatigue life tests received for the drilled as well as drilled and reamed holes were also presentedfor comparison. The results obtained lead to the conclusion that that the lowest fatigue life characterises samples with drilled holes and drilled and reamed holes. Fatigue life of specimens with holes for rivets improved (by 50% to 74%, depending on load level), even as a result of the hole surface polishing only (minimum sizing degree), whilst the two-fold growth of fatigue life was achieved for holes of a slight sizing degree. A further significant increase in fatigue life was achieved by the cold work of the hole's surface. Based on the location of the fatigue diagrams and the fatigue life tests results, it may be concluded that the higher a sizing degree, the higher the fatigue life growth. The growth is also proportional to the specimen load level: the lower the load level, the higher the fatigue life growth. Fatigue diagrams obtained from tests were divided into three groups: diagrams for drilled holes and drilled and reamed holes, diagrams for holes with a low degree of sizing and diagrams for holes with a high degree of sizing. This division was confirmed by statistical tests of regression lines parallelism by the “peer-to-peer” method.
    Źródło:
    Fatigue of Aircraft Structures; 2012, 4; 64-69
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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