Under experiments in a closed explosion chamber, the mass of charge is restricted to a small amount. In order to utilize TNT as a standard explosive in the chamber, the detonation of small amount of TNT was evaluated by measurement of blast pressure. Since the confinement and initiation pressure had no effect on the blast pressure and the experimental values of the peak overpressure and the scaled arrival time were in good agreement with the reference, it was recognized that 50g of powder TNT (the charge density : ca. 800kg•m-3) detonated completely. The second order regression approximation lines of the peak overpressure, the scaled impulse of positive phase, and the scaled arrival time were derived as the TNT standard equations of the blast parameters in the chamber.
爆発チャンバー内での爆風圧計測では,薬量が少量になる制限がある。そこで,TNTを基準爆薬として利用するために,小薬量でのTNTの完爆性を爆風圧により検討した。
ガラス容器の有無による密閉強度の違い,あるいはブースタの有無による起爆圧力の違いで爆風圧に差は認められず,また,ピーク過圧及び換算到達時間は大薬量での報告値とほぼ一致したことから,装薬密度約800kg・m-3 の粉状TNTは50gでも電気雷管起爆で完爆していると考えられた。爆発チャンバー内での爆風パラメータの基準曲線を得るために,ピーク過圧,換算正相インパルス,換算到達時間それぞれの,換算薬量2〜6m・kg-1/3における2次回帰近似式を算出した。
blast wave, peak overpressure, scaled impulse of positive phase, scaled arrival time, TNT