Temat: absorption energy - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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