AC-J detonation pressure generated by a steady detonation of explosive is the characteristic value
of an explosive. It is often shortage of generated pressure to some of metal processing.
In this study, we take notice a two combined explosive system that the lower velocity explosive is
enrolled by the higher velocity explosive tube. The performance of this system has been investigated
by numerical simulation. And the following results were obtained.
(1)The detonation of the lower velocity explosive is increased by the effect of the high velocity explosive.
Its final velocity is higher than the C-J detonation velocity.
(2)Mach reflection of detonation wave occurred in the lower velocity explosive, it was clear that the
higher pressure over the C-J detonation pressure of the used explosive happened behind the Mach
disk.
(3)Although the detonation pressure of lower velocity explosive increases as the density of the low
detonation velocity explosive, a peak of its maximum pressure exists at a certain density. The
maximum pressure converges on the C-J detonation pressure of the high detonation velocity explosive
as density is approached at a higher velocity explosive after the peak.
高性能爆薬の定常爆ごうによって発生する爆ごう圧力は爆薬の特性値であるため, 爆薬を使用する金属加工法において目的の圧力に不足する場合が多く発生する｡ 本研究では, 高爆速 ･ 低爆速の二種類の爆薬を使用することによって低爆速爆薬中に過剰爆ごう(Overdriven detonation)を発生させ, C-J爆ごう圧力以上の圧力を発生させるモデルについて数値解析を行い, 以下の結果を得た｡
(1) 低爆速爆薬の爆ごう速度は高爆速爆薬の爆ごうによって増加し, C-J爆ごう速度以上の爆ごう速度で爆ごうした｡
(2) 低爆速爆薬中に爆ごう波の反射が確認され, Mach disk後方に使用した低爆速爆薬のC-J爆ごう圧力よりも高い圧力が発生することが確認された｡
(3) 低爆速爆薬の密度の増加に比例して爆ごう圧力は増加するが, ある密度でピークが存在する事が推定できた｡ ピークを過ぎた後は高爆速爆薬に密度に近づくにつれ高爆速爆薬のC-J爆ごう圧力に収束する｡