刚性弹体冲击金属网网孔的试验和数值分析

Experimental and numerical analysis of rigid projectile impacting the mesh of wire nets

根据金属网与近程武器(火箭弹、迫击炮弹)相互作用的特点,在实弹拦截试验的基础上,设计并开展了刚性弹体低速冲击金属网网孔的试验。试验表明:金属网网孔在刚性弹体冲击下横向两侧钢丝交叉节点位置存在明显接触滑移,且在冲击过程中此交叉节点位置钢丝首先发生了断裂破坏,冲击后除与弹体接触部位网孔发生变形和破坏外,其余部位金属网网孔基本能恢复初始状态。结合实弹和刚性弹体低速试验现象、高强钢丝材料静动态性能试验数据等,采用LS-DYNA软件建立了精细化的金属网数值模型,开展了刚性弹体冲击金属网网孔的数值分析,数值方法可以较好的预测金属网网孔与刚性弹体间的相互作用以及金属网网孔钢丝断裂破坏现象。最后,利用数值方法对影响金属网与弹体间相互作用的因素进行了研究,结果表明:刚性弹体在冲击金属网网孔过程中受到的峰值过载力、能量损失与弹体口径和冲击速度有关,与弹体的质量关联性不大;随着弹体口径的增大,弹体受到的峰值过载力和能量损失逐渐增大;随着冲击速度的增大,弹体受到的峰值过载力逐渐增大,而弹体的能量损失逐渐减小。

According to the characteristics of the interaction between wire nets and short-range weapons(rockets,mortar shells,etc.),the experiment of rigid projectile impacting the mesh of wire nets at low speed was designed and carried out based on the live ammunition tests.The experimental results show that:the mesh of wire nets has obvious contact slip at the intersection of the steel wires on both sides of the transverse direction,and the steel wires at these intersection positions fracture firstly.After the impact,the mesh of the other parts of the wire nets could recover to the initial state,except for the deformation and damage of the mesh in contact with the projectile.Combined with the experimental phenomena of the live ammunition tests and the rigid projectile low speed impact tests,and the static and dynamic test data of high-strength steel wire material,a refined numerical model of wire nets was established by employing the LS-DYNA software,and the numerical analysis of rigid projectile impacting the mesh of wire nets was implemented.The numerical simulation can better predict the interaction between the mesh of wire nets and the rigid projectile,as well as the fracture of the steel wires at the intersection positions of the wire nets.Finally,the factors affecting the interaction between the mesh of the wire nets and the rigid projectile were studied by numerical mothed.The results show that the peak overload force and energy loss of the rigid projectile during the impact of the mesh in the wire nets were related to the caliber and the impact speed of the rigid projectile,not the mass of the rigid projectile;with the increase of the caliber,the peak overload force and the energy loss of the rigid projectile increase;with the increase of the impact speed,the peak overload force of the rigid projectile increases,while the energy loss gradually decreases.