爆炸箔尺寸对飞片速度的影响

爆炸箔是冲击片雷管的关键部件,为了获得爆炸箔的厚度和桥区尺寸对冲击片雷管飞片速度的影响,通过光纤台阶法测试了不同厚度和桥区尺寸的爆炸箔驱动飞片的情况。结果表明:在电压3.4 kV、电流3.5 kA的起爆条件下,最佳的爆炸箔厚度为3.67μm,可以驱动飞片产生2 307 m/s的速度;随着爆炸箔桥区尺寸的减小,飞片速度逐渐提高。因此,可以看出在一定的起爆能量下,驱动飞片达到最大速度的爆炸箔存在一个最佳厚度值;在爆炸箔厚度一定的情况下,减小爆炸箔的桥区尺寸,可以提高爆炸箔驱动飞片的能力,从而可以达到降低冲击片雷管起爆能量阈值的目的。

Effect of Exploding Foil Size on Flyer Velocity

The exploding foil is a key component of slapper detonators. The influence of thickness and size of exploding foils on flyer velocity was investigated through optical methods. The results show that, at the pre-specified conditions (3.4 kV,3.5 kA), the plasma generated by a 3.67 μm thick foil enables the flyer velocity to be up to 2 307 m/s. Additionally, the flyer velocity increases with the reduction in the size of the bridge. Therefore, a critical foil thickness that relates to the maximum flyer velocity exists at a certain initiation energy. When the foil thickness is determined, a smaller energy is needed for exploding foils with smaller bridge to initiate the explosive charge so that the firing threshold of slapper detonators can be decreased by reducing the bridge size.