| Citation: | ZHAO Beilei, ZHAO Jiguang, CUI Cunyan, et al. Initial velocity and influence factors of tank explosion fragments[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(9): 1797-1804. doi: 10.13700/j.bh.1001-5965.2018.0746(in Chinese)
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To determine the initial velocity of tank explosion fragments under the propellant detonation, the fragment initial velocity (FIV) model was established based on the energy conservation law, in which the kinetic energy of explosion fragments, the kinetic energy and internal energy of detonation products, the failure energy and the consumed energy for expansion work of tank shell were considered. The FIV model was in good agreement with the calculation results of typical empirical formulas and the experimental data, which verifies the effectiveness of the model. Based on the dimensional analysis method, the key parameters affecting the initial velocity were determined. Based on AUTODYN software, numerical simulation was conducted and the effects of height-diameter ratio, thickness-diameter ratio and air density on fragment initial velocity were analyzed. Results show that the initial velocity of explosion fragment decreases rapidly with the increase of height-diameter ratio, and the attenuation trend slows down when the height-diameter ratio exceeds 1.50. The initial velocity almost linearly decreases with the increase of thickness-diameter ratio. When the explosion height is less than 20 km, as the explosion height rises, the air density decreases, and the initial velocity increases. The air becomes very thin above 40 km, and the influence of shell expansion work on initial velocity can be neglected.
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