金属网增强遮弹层抗高速弹体侵彻的数值研究

Numerical study of metal mesh enhanced shielding layer against high velocity projectile penetration

基于验证的数值模型从弹体侵彻深度、弹坑直径、局部破坏情况和能量变化等方面对金属网增强遮弹层抗高速弹体侵彻的冲击响应进行参数化研究,涉及的参数包括:金属网布置形式、金属丝丝径、金属网孔径和金属网层数。研究表明:在素混凝土遮弹层中加入金属网可以有效降低弹体侵彻深度和剩余速度、减小弹坑直径、改善局部破坏情况、加快弹体初始动能耗散。适当增加单位面积网格密度或金属网体积分数可以进一步提高金属网增强遮弹层的抗侵彻性能,具体措施有:螺旋布置金属网、增加金属丝丝径、减小金属网孔径、增加金属网层数等。最后,基于数值研究结果,提出预测平行布置金属网增强遮弹层弹体侵彻深度的计算公式,该公式拟合精度较高,可为该遮弹层在防护工程中的具体应用提供有益参考。

Based on the verified numerical model,impact responses of metal mesh enhanced shielding layer against high-speed projectile penetration were studied parametrically from aspects of projectile penetration depth,crater diameter,local damage situation and energy variation.The involved parameters included layout of metal mesh,diameter of metal wire,aperture of metal mesh and number of metal mesh layers.The study results showed that adding metal mesh into plain concrete shielding layer can effectively reduce projectile’s penetration depth,its residual velocity and crater diameter,improve local damage situation,and speed up projectile’s initial kinetic energy dissipation;appropriately increasing mesh density per unit area or volume fraction of metal mesh can further improve the anti-penetration performance of metal mesh enhanced shielding layer,the specific measures include spiral arrangement of metal mesh,increasing diameter of metal wire,reducing aperture of metal mesh and increasing number of metal mesh layers,etc.Finally,based on the numerical study results,a calculation formula was proposed to predict projectile penetration depth into metal mesh enhanced shielding layers arranged in parallel.It was shown that the formula has higher fitting accuracy;it can provide a useful reference for the specific application of the shielding layer in protective engineering.