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    Wyświetlanie 1-4 z 4
    Tytuł:
    Energy absorbing effectiveness – different approaches
    Autorzy:
    Kotełko, M.
    Jankowski, J.
    Ferdynus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/387477.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    thin-walled structure
    energy absorber
    impact
    absorbing effectiveness
    Opis:
    In the paper the study of different crashworthiness indicators used to evaluate energy absorbing effectiveness of thin-walled energy absorbers is presented. Several different indicators are used to assess an effectiveness of two types of absorbing structures, namely thin-walled prismatic column with flaws and thin-walled prismatic frustum (hollow or foam filled) in both cases subjected to axial compressive impact load. The indicators are calculated for different materials and different geometrical parameters. The problem of selection of the most appropriate and general indicators is discussed.
    Źródło:
    Acta Mechanica et Automatica; 2018, 12, 1; 54-59
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact behaviour of spot-welded thin-walled frusta
    Autorzy:
    Kotełko, M.
    Mołdawa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/386785.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    thin-walled structures
    frusta
    impact
    energy absorption
    konstrukcja cienkościenna
    absorpcja energii
    zgrzewanie punktowe
    Opis:
    In the paper the dynamic response of thin-walled, spot-welded prismatic frusta subjected to axial impact load is investigated. The parametric study into the influence of several parameters on the energy absorption capability, expressed by some crashworthiness indicators is performed, using Finite Element simulations. FE model is validated by experimental results of quasi-static and dynamic (impact) tests. Results of initial study concerning influence of spot welds are presented. Some conclusions are derived from the parametric study into the influence of frustum angle and wall thickness upon the energy absorption capability.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 4; 280-284
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact Process Identification for Impact Cylinder Piston
    Autorzy:
    Zbrowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/386983.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    siłownik udarowy
    szybka kamera
    oznakowanie
    energia kinetyczna
    impact cylinder
    high speed camera
    marking
    bounce
    kinetic energy
    Opis:
    The phenomenon of the tool rebound from the object processed, that can be noticed particularly in the case of impact marking, has a negative influence on the quality of the processing of moving objects, which is a result of the blur effect caused by the shift of the object processed at the time of its retraction. The objective of the study was to determine the influence of both the capacity of the chamber of the accumulator and the working pressure on the characteristics of the phenomenon of the piston rebound from the obstacle that can be noticed after it hits a hard fender for the very first time. The article present the results of research consisting in the analysis of the rebound phenomenon for impact cylinder pistons. The tests were carried out for cylinders whose structure allowed for the change in the capacity of the accumulator chamber. Cylinders with the pistons of 40 and 100 mm in diameter and supplied by 4 and 6 bar pressure were subject to tests that were undertaken at the test stand equipped with Phantom V310 high speed digital camera.
    Źródło:
    Acta Mechanica et Automatica; 2012, 6, 2; 88-92
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crushing behaviour of the PVC foam loaded with beaters of various shapes
    Autorzy:
    Bogusz, P.
    Gieleta, R.
    Stankiewicz, M.
    Konarzewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/387664.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    polymer foam
    polyvinyl chloride foam
    hitting with a blunt object
    energy absorption
    impact tests
    experimental mechanics
    Opis:
    Statistically, at least 50% of all injuries experienced by police officers in the line of duty are due to assaults with blunt objects. Therefore, vests used by the police should provide not only good ballistic resistance, but also good protection against such threats. Foamed materials are possible to be used for body protectors or inserts of protective clothes. The effects of dynamic impact with beaters of different shapes onto behaviour of polymeric foamed material were determined. There were used four types of beaters: flat, cylindrical, edgy and cornered. Strikes with blunt objects such as a flat board, baseball bat, edgy brick, pavement brick or a sharp stone, to which a protective ware can be subjected, were simulated. The impact load was applied to the rectangular specimens, made of polyvinyl chloride foam, with a usage of a drop hammer. Plots of force versus compression for all the tested samples were obtained and analysed. The effects of impacts with beaters of different shapes onto foamed material samples were presented. A shape of the blunt object significantly influences crushing behaviour of the foamed material. The impact energy of a flat beater is absorbed effectively on a short distance, since it is spread on a relatively large surface. The cylindrical and edgy beaters did not cause fragmentation of the samples, however, on the upper surfaces of the samples, permanent deformations mapping the beaters shapes as well as some cracks occurred. An impact with a sharp object, for example, a cornered beater is very difficult to be neutralized by the foam material, because it is cumulated on a small area.
    Źródło:
    Acta Mechanica et Automatica; 2018, 12, 1; 23-30
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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