Science and Technology of Energetic Materials

Vol.62, No.5 (2001)

Research paper

Expansion of explosion products by the surface burst of explosives in the field tests(*in Japanese)
Yoshio Nakayama, Masataka Yoshida, and Syuzo Fujiwara


Results of high - speed photographs of surface burst of many kinds of exploaives in the field experiments were summarized and the time histories of height and radius of the explosion products were examined. As a result,a cubic root similarity was recognized in the data for sin - kiri dynamite,ANFO and TNT. The height to radius ratio of explosion products(H / R) were found to be almost constant value of unity and the variation in the data was considered to be due to the effects of the reduced height of burst or the initiation positions. A numerical calculation by the one - dimensional Lagrange code was conducted and it was found that the calculated separation time of shock wave from the explosion products agreed well with the observed data. Furthermore. pulsation of explosion products was shown in the one - dimensional calculation. However the explosion product was monotonically expanded and no pulsation was observed in the experimental results.

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