One-and two-dimensional numerical modelling of shock inducend transition to detonation in the condensed explosives

• Autorzy: Gac K. , Jach K. , Mroczkowski M. , Wolański P.
• Języki publikacji: EN

Abstrakty

EN

In this paper, the basic processes accompanying a shock initiation of a detonation have been analyzed theoretically using numerical methods. The detailed discussion of initiation of a detonation by nonstationary shock waves generated by a solid body impact or explosively driven inertial partition is presented. The physical-mathematical model applied here comprises the set of equations of gas-dynamics, the elastic-plastic, and elastic/viscous-plastic theory. The additional elements of the model are constitutive relations rendering properties of materials and semi-empirical model of chemical reactions. In order to study these problems, the time dependent one- and two-dimensional fluid-dynamic equations have been numerically integrated for specific initial conditions. One-dimensional code is based on finite difference method. The two-dimensional numerical code is based on so called free particle method (HEFP - model). One of the fundamental questions answered is whether or not a stationary detonation wave will result from the given initial parameters. The better understanding of the nonstationary phenomena has been achieved, particularly at the transient processes preceding formation of a detonation wave. A phenomenon of generation of retonation wave was explained.

Słowa kluczowe

EN

shock waves; initiation of detonation; retonation

PL

materiałoznawstwo; fala uderzeniowa; detonacja

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2001
• Tom: Vol. 6, no. 1
• Strony: 211--226
• Opis fizyczny: Bibliogr. 10 poz., wykr.

Twórcy

autor

Gac K.

• Institute of Optoelectronic, Military University of Technology ul. Kaliskiego 2, 01-489 Warszawa, POLAND

autor

Jach K.

• Institute of Optoelectronic, Military University of Technology ul. Kaliskiego 2, 01-489 Warszawa, POLAND

autor

Mroczkowski M.

• Institute of Optoelectronic, Military University of Technology ul. Kaliskiego 2, 01-489 Warszawa, POLAND

autor

Wolański P.

• Institute of Heat Engineering, Warsaw University of Technology ul. Nowowiejska 25, 00-665 Warszawa, POLAND

Bibliografia

• [1] Batlova M.V., Bakhrakh S.M. and Zubarev V.N. (1977): Roscet vozbuzdenia dietonacii udarnymi volnami. - Fizika Gorenja i Vzryva, vol.3, pp.416.
• [2] Chou P.C., Roslund L. and Liang D. (1993): Impact Initiated Annular Retonation Wave in Explosive. - Propell. Expl. Pyrotechnics, vol.18, pp.246-269.
• [3] Jach K. and Włodarczyk E. (1992): Solutions of the initial-value problems of the viscoplastic- nonstationary theory for the description shaped charge jet formation and target penetration. - Proc. 13th Int. Symp. on Ballistics, Stockholm, Sweden.
• [4] Jach K. (1987): Numerical modelling of two-dimensional elastic/visco-plastic deformation of materials at dynamic loads. - Proc. llth AIRAPT Int. Conf., Kiev, vol.4, pp.198.
• [5] Jach K. and Włodarczyk E. (1991): Computer modelling of the target penetration process. - J. Tech. Phys., vol.32, pp.l.
• [6] Sugak S.G., Kanel G.I., Fortov V.E., Ni A.L. and Stelmakh B.G. (1983): Cislennoe modelirovanie dejstvia vzryva na zeleznuju plitu. - Fizika Gorenja i Vzryva, vol.l9, pp.2.
• [7] Steinberg D.J., Cochran S.G. and Guinan M.W. (1980): A constitutive model for metals applicable at high-strain rate. - J. Appl. Phys. vol.51, pp.1498.
• [8] Utkin A.V., Kanel G.I. and Fortov V.E. (1989): Empiriceskaja makrokinetika razlozenia flegmatizovannogo geksogena v udarnykh i detonacionnykh volnakh. - Fizika Gorenja i Vzryva, vol.5.
• [9] Wilkins M.L. (1978): Mechanics of penetration and perforation. - Int. J. Eng. Sci., vol,16, pp.793.
• [10] Wilkins M.L. (1984): Modelling the behaviour of materials, structural impact and crashworthiness. - Proc. Int. Conf., London, New York, vol.2.