爆炸成型模拟弹丸水中飞行影响因素

为了研究爆炸成型弹丸(EFP)结构参数对其水中飞行特性的影响,利用LS-DYNA有限元分析软件,对不同结构参数下EFP等效模型侵彻水介质进行了数值模拟,获得了弹丸结构参数对EFP水中飞行特性的影响。仿真结果表明:弹丸尾裙长度和实心部厚度对EFP水中速度衰减的影响均呈正相关,其数值越大弹丸水中速度衰减越缓慢,EFP水中质量的损失主要体现在尾裙部分质量的损失; 以不同速度入水的EFP弹丸在速度下降为60%的范围内,其相对速度v_e/v₀衰减具有较好的一致性,当速度衰减超过60%后,入水速度越高则EFP水中速度衰减幅度越大; 弹丸材料密度在EFP水中速度衰减过程中具有重要作用,密度越高则EFP速度衰减和质量损失越缓慢,存速能力越强,密度相近时,弹丸速度和质量变化规律均趋于一致。

Factors Influencing Flight Characteristics of Simulated EFP in Water

In order to study the influence of structure parameters of explosively formed projectile(EFP)on flight characteristics in water,the finite element analysis software LS-DYNA was used to simulate the EFP simulated model with different-structural-parameters penertrating water. The factors influencing flight characteristics of simulated EFP in water were presented. The results indicate that EFP skirt length and core thickness are positive correlated with EFP velocity in water,and the attenuation of EFP velocity decreases with the increase of skirt length and core thickness. The EFP mass abrasion is primarily due to the loss of skirt part. When EFP enters water at different velocity,the attenuation of relative velocity v_e/v₀ maintains consistent under the conditions of velocity decreasing to 60%; the v_e/v₀ attenuation increases with the increase of enter-velocity while the velocity is less than 60%. Projectile material density has an important role in the process of velocity attenuation of EFP traveling in water. The velocity attenuation and mass abrasion are gradually slow with the increase of density. The change of velocity and mass are nearly consistent at similar density.