The attenuation effect on a blast wave resulting from completely covering an explosive charge with biodegradable foam material (BFM) was studied. As the BFM does not have an electrostatic charge, it is considered to be safer than foam polystyrene small spheres (FPS), which were verified to be an effective barrier material in our previous study. A cylindrical polyetyrene bag made of thin polyetyrene film was filled with BFM. A spherical charge of composition C-4, weighing 50 g or 100 g, was detonated at the center of the bag. The diameter and height of the bag were identical, measuring 200 mm, 300 mm, or 400 mm. The blast pressure was measured at a scaled distance of 2m·kg-1/3to 6.5 m·kg-1/3. The attenuation effect of the BFM was slightly smaller than that of the FPS for the same barrier-material thickness, while the density of the BFM was half that of the FPS. The attenuation effect of the BFM on the explosive charges of 50 g and 100 g was described consistently using the scaled barrier-material thickness ; i.e., the thickness divided by the cubic root of the explosive weight.
爆薬を生分解性緩衝材で囲んで点火した場合の爆風圧低減効果を評価した。生分解性緩衝材は，帯電性がないため，以 前の研究で効果が高かった発泡スチロール微小球よりも安全性が高いことから評価対象とした。コンポジションC-4爆 薬50 gまたは100 gを直径，高さともに200 mm，300 mm，400 mmのポリエチレンシート製円筒容器中に固定し，この容 器の残りの部分を生分解性緩衝材で満たした。換算距離2m kg-1/3から6.5 m kg-1/3で爆風圧を計測した。爆風圧低減効 果は，同じ緩衝材の厚さで比較すると，発泡スチロール微小球よりも若干低かった。ただし，かさ密度は発泡スチロー ル微小球のほぼ半分であった。また，爆薬50 g，100 gの爆風圧低減効果は，緩衝材の厚さを換算距離で現した値で統一 的に整理できた。
blast wave, attenuation, biodegradable foam material.