反应破片对带壳装药的冲击效应

A study of the failure of cased charge under impact of reactive fragments

为了研究反应破片对带壳装药的冲击毁伤效应,通过弹道实验和AUTODYN有限元仿真,结合由等效破片初速和等效格尼速度表征的带壳装药各失效等级判据,获得并对比了惰性破片和反应破片冲击下带壳装药的等效破片初速、等效格尼速度、带壳装药的反应持续时间、鉴证靶破坏情况和炸药层峰值压力,分析了反应破片靶后释能特点对带壳装药失效的影响。结果表明:惰性破片可使带壳装药发生正常爆轰失效;反应破片穿靶后的动能与化学能叠加效应弱,只能使带壳装药发生爆燃失效或爆炸失效,带壳装药的等效格尼速度与格尼速度的比为0.014~0.233,炸药层峰值压力为1.04~3.62 GPa。

Reactive fragments are composed of multifunctional impact reactive structural materials.After reactive fragments penetrate the front target of warhead,the debris cloud generated by the sufficient reaction of reactive material will damage the medium behind the target in the form of kinetic energy-chemical energy coupling damage.Ballistic impact experiments and finite element simulations were conducted to investigate the impact damage effect of reactive fragments on cased charge.Based on the criteria for failure levels of cased charge characterized by equivalent fragments initial velocity and equivalent gurney velocity,the ratio of the equivalent gurney velocity under abnormal detonation conditions to gurney velocity or the ratio of the equivalent fragments initial velocity under abnormal detonation conditions to the fragments initial velocity is used to measure the reaction violence of the cased charge.Equivalent gurney velocity of cased charge under impact of inert fragments and reactive fragments,response duration of cased charge,the damage of the authentication target,and the peak pressure of explosive layer are compared.The influence of energy release characteristics of reactive fragments on the failure of cased charge is also analyzed.The results show that explosive detonate under the impact of inert fragments,while explosive deflagrate or explode under the impact of reactive fragments.The steel verification target only presents significant circular pit during explosive detonation.The explosive detonation process captured by high-speed photography is on the microsecond scale,while the explosive explosion or deflagration process is on the millisecond scale.Under the penetration of six reactive fragments,the corresponding ratio of equivalent gurney velocity to gurney velocity ranges from 0.014 to 0.233,which is far below the ratio of equivalent gurney velocity to gurney velocity under the condition of inert fragments penetrating cased charges.By using AUTODYN,the peak pressure at the observation point on the axis of the cased charge during detonation failure under the penetration of inert fragments ranges from 17.3 to 34.5 GPa,while the peak pressure of cased charge during deflagration failure under the penetration of reactive fragments ranges from 1.04 to 3.62 GPa,which is far below the critical detonation pressure.Based on the ratio of the equivalent gurney velocity to gurney velocity,the peak pressure of explosive and superimposed effect of kinetic energy and chemical energy of reactive fragments,the idea that it is difficult to detonate cased charge under the penetration of reactive fragments is proposed.