Evaluation of impact of the deflector shape on effectiveness of weakening the blast wave originating from a mine or IED

• Autorzy: Panowicz R. , Nowak J. , Konarzewski M.
• Języki publikacji: EN

Abstrakty

EN

The situations which our forces faced during various stabilization military missions showed that light armored vehicles are not secure enough in the case of the mine or improvised explosive devices explosion. Nowadays, the primary way of protection against this type of threat is application of a V-shape bottom in the vehicle. Such a configuration of the bottom allows dissipation of explosion energy whereby the impulse, which is transmitted to the construction – the vehicle bottom or frame, has a much lower value than in the case where the bottom is flat. In the literature it is possible to find the results of model tests on an experimental laboratory test stand. These studies show that the value of the impulse which is transmitted to the structure depends on the shape of the deflector, actually on its angle. Assuming the above condition, there were performed numerical analyses of the values of the impulse transmitted to the construction for deflectors with different angles and for a variety of loads masses. The aim of the numerical analyses was to find the optimal angle of the deflector for the considered situation. In this model, the optimal value of the angle is that in which the considered value of the impulse transmitted to the construction reaches the minimum value. For this purpose, there was made a finite element model of deflector corresponding to the conditions of the experiment. The shell elements were used in this model. The model was loaded with a pressure impulse derived from the detonation of an explosive. The blast wave interaction with the structure was modeled using the fluid structure interaction. The numerical analyses were based on the finite element method with the explicit time integration method implemented in the LS-DYNA program.

Słowa kluczowe

EN

finite elements method; simulation; military vehicles; deflector

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2013
• Tom: Vol. 20, No. 2
• Strony: 329--334
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Panowicz R.

• Military University of Technology Department of Mechanics and Applied Computer Science Kaliskiego Street 2, 00-908 Warsaw, Poland tel.: [phone], fax: [phone]

autor

Nowak J.

• Military University of Technology Department of Mechanics and Applied Computer Science Kaliskiego Street 2, 00-908 Warsaw, Poland tel.: [phone], fax: [phone]

autor

Konarzewski M.

• Military University of Technology Department of Mechanics and Applied Computer Science Kaliskiego Street 2, 00-908 Warsaw, Poland tel.: [phone], fax: [phone]

Bibliografia

• [1] Army Guide [online], http://www.army-guide.com/eng/product.php?prodID=241.
• [2] Defence Market Intelligence [online], http://dmilt.com/docs/MRAP.pdf.
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• [4] LS-DYNA Keyword User’s Manual, ver. 971, Livermore Software Technology Corporation (LSTC), May 2007.
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• [6] Masahiko, O., Yamato, M., Kenji, M., Yukio, K., Shigeru, I., A Study on Shock Wave Propagation Process in the Smooth Blasting Technique, 8th International LS-DYNA Conference, Detroit 2004.
• [7] Włodarczyk, E., Wstęp do mechaniki wybuchu, PWN, Warsaw 1994.
• [8] Ramajeyathilagam, K., Vendhan, C. P., Bhujanga Rao, V., Non-linear Transient Dynamic Response of Rectangular Plater Under Shock Loading, International Journal of Impact Engineering, Vol. 24, pp. 999–1015, 2000.
• [9] Panowicz, R., Kołodziejczyk, D., Sybilski, K., Barnat, W., Niezgoda, T., Analiza numeryczna dynamicznego oddziaływania fali ciśnienia na złożoną strukturę panelu energochłonnego, Przegląd Mechaniczny, Nr 11, s. 40-45, 2012.
• [10] Panowicz, R., Barnat, W., Niezgoda, T., Szymańczyk, L., Grzymkowski, J., Numerical-Experimental Investigation of Squared-Based Metal Pyramids Loaded with Blast Wave from a Small Explosives Charge, Acta Mechanica et Automatica, Vol. 6, No. 1, pp. 49-52, 2012.