小口径弹丸冲击装药响应仿真研究

Simulation study on impact charge response of small caliber projectile

在作战环境中,战斗部内的Comp B炸药可能会遭受子弹的撞击而影响其作战性能。为研究该炸药的枪击安全性,采用点火增长模型,对初速为950 m/s的5.8 mm弹丸射击带壳炸药进行数值模拟。研究了炸药壳体厚度对冲击起爆的影响,发现壳体厚度从2 mm增加到3 mm,炸药均发生爆炸。壳体厚度为4 mm时,炸药仅有少量发生反应。当壳体厚度增大至5 mm时,炸药基本不发生反应,表明随着壳体厚度的增大,弹丸冲击带壳炸药的响应程度逐渐减弱。分析弹丸轴向偏移量对冲击起爆的影响,发现随着偏轴距离的增大,炸药中反应度的扩展速度减小,弹丸难以引爆炸药。当偏轴距离大于等于60 mm时,弹丸出现跳飞现象,弹丸无法引爆炸药。

In the combat environment, Comp B explosive in the warhead may be impacted by bullets and affect its combat performance. In order to study the shooting safety of this explosive, the firing shell explosive with 5.8 mm projectile with initial velocity of 950 m/s is numerically simulated by using ignition growth model. The influence of the thickness of explosive shell on impact initiation is studied. It is found that when the thickness of shell increases from 2 mm to 3 mm, all explosives explode. When the shell thickness is 4 mm, only a small amount of explosive reacts. When the shell thickness increases to 5 mm, the explosive basically does not react, indicating that with the increase of shell thickness, the response degree of projectile impact on shell explosives decreases gradually. The influence of axial offset of projectile on impact initiation is analyzed. It is found that with the increase of off-axis distance, the expansion speed of reactivity in explosive decreases, and it is difficult for projectile to detonate explosive. When the off-axis distance is greater than or equal to 60 mm, the projectile will jump, and the projectile will not detonate the explosive.