Study on the superposition effect of shock waves in the formation of the grouped multiple explosive formed projectile

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (1) : 56-60.

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Study on the superposition effect of shock waves in the formation of the grouped multiple explosive formed projectile

ZHANG Yang-yi1 2; LONG Yuan1; JI Chong1; MA Hai-yang1; ZHOU Xiang1; HE Yang-yang3

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Abstract

To investigate the forming mechanism of Multiple Explosive Formed Projectile（MEFP）and find the key factors effecting forming aerodynamic projectile, LS-DYNA was used to simulate the forming process of the grouped MEFP on the condition of simultaneous and asynchronous detonation. Also the superposition effect of shock waves was theoretical analyzed. The study indicates: the superposition of the shock waves which are reflected by parietal cliff of the charge and top of the liner is the reason of the center projectile tend to break with a bigger velocity and the around projectile has an asymmetrical shape; Choosing a low density filled material with a good energy absorption characteristic can minimize intensity of the reflect waves and superposition effect; When the detonating delay is bigger than 5µs, the liner of center charge would be “over collapsed” which is against the formation of the projectile. The conclusions can supply a theoretic basis for choosing a property filled material、confirming the space between the charges and adjusting precision of the multi-point detonating equipment.

Key words

Mechanics of explosion / superposition effect of shock waves / numerical simulation / MEFP

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ZHANG Yang-yi;LONG Yuan;JI Chong;MA Hai-yang;ZHOU Xiang;HE Yang-yang. Study on the superposition effect of shock waves in the formation of the grouped multiple explosive formed projectile[J]. Journal of Vibration and Shock, 2012, 31(1): 56-60