Science and Technology of Energetic Materials

Vol.67, No.5 (2006)

Research paper

Photographic study of channel effect on emulsion explosives
Fumihiko Sumiya, Yoshikazu Hirosaki, Yukio Kato, Yuji Wada, Yuji Ogata, and Kunihisa Katsuyama


The precursor air shock wave (PAS) in air channel, which propagates ahead of the detonation front, precompresses and desensitizes the unreacted explosive charges. On some conditions, the PAS leads to the failure of explosive detonation. This phenomenon is commonly known as the channel effect. To investigate the mechanism of the channel effect in emulsion explosives in the case of smooth blasting, some experimental work has been carried out using a high-speed framing camera. The results of photographic investigation demonstrate that the compression time by PAS caused by the difference between PAS velocity and detonation velocity is the primary factor for the occurrences of the channel effect.

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Emulsion explosive, Channel effect, Photographic, Precursor air shock wave (PAS)

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