Numerical Modeling of Self-Ignition of Energetic Materials

• Autorzy: Sućeska M. , Matečić-Muśanić S.
• Języki publikacji: EN

Abstrakty

EN

Thermal decomposition of energetic materials is accompanied by generation of heat, and under certain conditions may lead to the well-known phenomenon of the self-ignition (or thermal explosion). Therefore, it is of great concern of explosive community to predict whether or not a specimen of energetic material will ignite or not under given conditions (defined primarily by a specimen mass and shape, surrounding temperature, etc.). In order to describe the reactive heat conduction phenomena in an infinite slab, cylindrical, and spherical geometry of an explosive material, an own computer program, based on the thermal explosion theory and the finite difference method, was developed. The program was tested by the comparison of calculated times to ignition for some standard high explosives with times to ignition determined experimentally, as well as with times to ignitions calculated by some other authors. The results of calculations were also compared with the results of calculation according to an analytical solution of the heat balance equation derived by Frank-Kamenetskii. It was found out that not only values of the activation energy and pre-exponential factor, but also the kinetic model of thermal decomposition used in the calculation, have a crucial influence on the results of calculation. It was also shown that the Frank-Kamenetskii equation gives considerably lower values of the times to ignition, and higher values of the critical temperatures for explosives studied.

Słowa kluczowe

EN

energetic materials; self-ignition; thermal explosion; numerical modelling

• Czasopismo: Central European Journal of Energetic Materials
• Rocznik: 2004
• Tom: Vol. 1, nr 1
• Strony: 23--41
• Opis fizyczny: Bibliogr. 11 poz.

Twórcy

autor

Sućeska M.

• Brodarski Institut - Marine Research & Special Technologies, Av. V. Holjevca 20, 10000 Zagreb, Croatia

autor

Matečić-Muśanić S.

• Brodarski Institut - Marine Research & Special Technologies, Av. V. Holjevca 20, 10000 Zagreb, Croatia

Bibliografia

• [1] J. Isler, D. Kayser, Correlation Between Kinetic Properties and Self-Ignition of Nitrocellulose, 6th Symp. Chem. Probl. Connected Stab. Explos, Kungalav, Svcden 1982, pp. 217-237.
• [2] J. Zinn, C. L. Mader, Thermal Initiation of Explosives, J. Appl Phys., 1960,31(2), 323.
• [3] A. G. Merzhanov, V. G. Abramov, Thermal Explosion of Explosives and Propellants. A Review, Propellants and Explosives, 1981, 6, 130.
• [4] Standard practice for calculation of hazard potential figures-of-merit for thermally unstable materials, ASTM standard E 1231-88.
• [5] C. L. Mader, Numerical Modeling of Explosives and Propellants, CRCPress, Boca Raton, 1998, pp. 136-187.
• [6] C. A. Anderson, TEPLO - A Heat Conduction Code for Studying Thermal Explosion in Laminar Composites, Report LA-4511, Los Alamos Scientific Laboratory, Los Alamos 1970.
• [7] J. Isler, Auto-inflammation de poudres a simple base, Propellants, Explos. Pyrotechn., 1986, 40.
• [8] R. R. McGuire, C. M. Tarver, Chemical Decomposition Models for Thermal Explosion of Confined HMX, RDX, and TNT Explosives, Report UCRL-84986, Lawrence Livermore Laboratory, Livermore 1981.
• [9] M. Suceska, A Computer Program Based on Finite Difference Method for Studying Thermal Initiation of Explosives, J. Thermal Analysis and Calorimetry, 2002, 68, 865-875.
• [11] M. Suceska, Influence of Thermal Decomposition Kinetic Model on Results of Propellants Self-Ignition Numerical Modeling, Proc. of the 5th Seminar "New trends in Research of Energetic Materials, April 24-25 Pardubice, Czech Republic, 2002, pp. 309-322.