Science and Technology of Energetic Materials

Vol.67, No.6 (2006)

Research paper

Attenuation of blast wave using water gel (*in Japanese)
Tomotaka Homae, Kunihiko Wakabayashi, Tomoharu Matsumura, and Yoshio Nakayama


Attenuation effect of mixture of water gel and foam polystyrene on blast wave was studied. Two sizes of spherical PMMA container, of which diameter were 100 mm and 200 mm, respectively, were prepared. The density of the mixture was varied from 0.12 g·cm-3 to 1.0 g·cm-3 by changing the mixed volume ratio. The containers were filled with the mixture. Spherical pentolite (0.1 kg) was ignited at the center of the each container. Three pressure transducers were placed around the container and the blast pressure was measured. The scaled distance from the charge to the three transducers were 3, 4, and 5 mg·kg-1/3, respectively. The relation between the density of the surrounded materials and the attenuation effect on the blast wave was discussed. In regard of the peak pressure, 200 mm-diameter container was much effective. The attenuation effect was maximum at the density of 0.54 g·cm-3. The peak pressure in such a case decreased to 45-53 % of that in case without the surrounded materials. On the contrary, in regard of the positive impulse, the maximum attenuation effect of two sizes of the containers was comparable, although the most effective density was different. The impulses in such cases were about 70 % of that without the mixture. This result shows that not only the mass of the surrounded barrier materials but also the porosity of the surrounded materials plays an important role for attenuation of the blast waves.

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Blast wave, Attenuation, Water gel, Foam polystyrene

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