一种测量工业炸药临界直径和临界厚度的连续电阻丝探针法

A Continuous Resistance Wire Probe Method for Determining the Critical Diameter and Thickness of Commercial Explosives

为了定量判定工业炸药的临界直径和临界厚度,自行研制了一种可连续测量爆轰波和冲击波速度的电阻丝探针,并以粉状铵油炸药(ANFO)为测试对象,设计了无约束锥形和半约束楔形两种装药形式,利用单发实验便可分别测得粉状ANFO炸药在两种约束条件下的爆速变化曲线,从而计算出相应的临界直径和临界厚度。结果表明:粉状ANFO炸药的临界直径随炸药密度的增大而增大;所测炸药在0.67 g·cm^(-3)密度下无约束条件时的平均临界直径为16.75 mm,底部钢板约束时的平均临界厚度为7.06 mm,两者的比值为2.37。

To quantitatively determine the critical diameter and critical thickness of commercial explosives,a continuous resistance wire probe used to measure the velocity of detonation wave and shock wave was developed by ourselves. Using powdery ammonium nitrate/fuel oil（ ANFO） as the test object,two kinds of charge forms of unconstrained cone-shaped charge and semi-constraint wedge-shaped charge were designed. The change curves in detonation velocity of the powdery ANFO under the two kinds of constrained conditions were measured and obtained by single experiment,then the corresponding critical diameter and critical thickness could be calculated. Results show that the critical size of powdery ANFO raises with the increase of explosive density. The average critical diameter of the explosive with the density of 0.67 g·cm-3 under unconstrained condition is 17.52 mm,and the critical thickness is 7.06 mm when the bottom steel plate is constrained.