Science and Technology of Energetic Materials

Vol.68, No.3 (2007)

Research paper

Effect of surface roughness on the precursor air shock wave in channel effect of emulsion explosive
Fumihiko Sumiya, Yoshikazu Hirosaki, Yukio Kato, Yuji Wada, Yuji Ogata, and Kunihisa Katsuyama


The precursor air shock wave (PAS) in air channel, which is propagating ahead of the detonation front, precompresses and desensitizes the unreacted explosive charges. This dead-pressing 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, experimental works have been carried out in laboratory. The surface roughness of inner wall of tube or pipe was varied to simulate the actual blasting borehole. It is concluded that the surface roughness of inner wall gives some influence on the propagation of PAS. The PAS velocity is reduced as the roughness is increasing. In some experimental condition, the detonation failure can be prevented.

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

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