Failure Analysis of Energy Dissipation by Axial Distance at the Energy Exchange Interface of Slapper Detonator
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摘要:为提高冲击片雷管作用的一致性和可靠性，针对因材料表面小型突起导致接触面不平整的装配问题，从换能界面能量耗散的角度对装配结构中两种轴向距离所产生的影响进行了探究。通过不同电压下的发火试验及感度试验，验证和分析两种轴向距离对冲击片雷管作用过程的影响。结果表明：加速膛-桥箔轴向距离会导致电爆能量的径向散失， 进而影响了飞片冲击药柱端面能量的大小并引起聚酰亚胺薄膜的撕裂拉伸，随着轴向距离的持续增加，爆炸桥箔逐渐失效；加速膛-药柱轴向距离会影响飞片飞行的平稳程度以及撞击药柱速度，随着轴向距离增加，飞片飞行距离增长，到达药柱端面的速度降低且不一致，导致起爆药柱的稳定性降低，轴向距离应控制在0.3 mm以内。
Abstract:In order to improve the consistency and the reliability of the slapper detonator, based on the assembly problems of uneven contact surface caused by small protrusions on the material surface, the influence of two axial distances in the assembly structure in view of the energy dissipation of the energy exchange interface were studied. Through the firing test and the sensitivity test at different voltages, the effect of two axial distances on the function process of detonator was verified and analyzed. The results show that the axial distance between accelerated chamber and bridge foil will cause radial loss of electric explosion energy, then the impact energy of the flyer on the end surface of charge is affected and the polyimide film will be torn and stretched, with the continuous increase of axial distance, the exploding bridge foil will gradually fail. Axial distance between accelerated chamber and charge will affect the flight smoothness of the flyer and the impact speed on the charge, as the axial distance increasing, the flight distance of flyer increases, the flyer speed reaching to the end of charge is lowered and inconsistent, which make it difficult to initiation the charge, therefore, the axial distance should be controlled within 0.3 mm.
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