Science and Technology of Energetic Materials

Vol.62, No.1 (2001)

Research paper

Detonation behavior of emulsion explosives (III)
On the critical charge diameter of the emulsion sennsitizad with relatively large voids (*in Japanese)
Yoshikazu Hirosaki, Shinya Tanaka, Yukio Kato, and Shigeru Itoh


The critical charge diameters were determined for the emulsion explosives sensitized with different sizes and quantities of resin microbdloons with average diameters between 0.05 mm and 2.42 mm. A reaction model was controlled based on the assumptions that the reaction in the explosive starts at the surface of the shock induced void followed by the progress of reaction in the bulk explosive to the adjacent void. The expanding rate of the void is assumed to be proportional to the square of the void diameter, the surface area of the void in other words. Lineadty was observed between the critical diameter of the explosive and the void surfaced istance. For the same void volume faction, the explosive sensitized with smaller void is rather governed by the reaction at the void surface due to its large surface area and shorter distance between next void. On the other hand, the critical charge diameter of the emulsion explosives sensitized with larger voids depends on the reaction rate in the bulk explosive. In both cases, the critical diameter is proportional to the void surface distance.
It was also shown that the critical chrge diameter relates to the void volume fraction and it is proportional to the reaction zone length in the explosive that is derived from the charge diameter effect when the void size is constant.

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