钨合金长杆弹撞击厚壁柱形目标临界跳飞角计算模型

针对钨合金长杆弹撞击厚壁柱形目标的跳飞问题，通过简化目标和分析变量构造弹目交汇物理模型，采用LS-DYNA3D显式动力学软件建立有限元仿真模型并进行校验，开展长杆弹以着速1 000~2 200 m/s、命中偏移角0°~40°多工况撞击厚壁柱形目标的仿真计算，得到不同着靶条件下长杆弹的临界跳飞角β_c。通过对着速v、命中偏移角γ对临界跳飞角β_c的影响进行量化分析，经数据拟合获取修正因子，建立基于Rosenberg临界跳飞角β_c的修正计算模型。与数值模拟结果对比结果表明，该模型对确定钨合金长杆弹撞击厚壁柱形目标跳飞边界具有较好的适用性。

Computational Model for the Critical Ricochet Angle of a Tungsten Alloy Long Rod Projectile Impacting a Thick-walled Cylinder

As new technologies such as electromagnetic orbit launch emerge, high-speed long rod projectiles play a prominent role in attacking thick-walled targets, such as short-range air defense anti-earth penetrating weapons. The key for rod ammunition to be effective is to achieve stable penetration without ricochet when hitting the target. To address the ricochet problem of tungsten alloy long rod projectiles impacting thick-walled cylindrical targets, a projectile-target contact model is developed by simplifying the target and analyzing variables. A finite element simulation model is established and verified based on LS-DYNA3D nonlinear dynamics software. Simulations are performed with an impact velocity ranging from 1 000 to 2 200 m/s and a hit-offset angle of 0°-40°. Then, a modified computational model based on Rosenberg is constructed by using fitted data. Compared with numerical simulation, verification results show that the model is suitable for determining the ricochet boundary of tungsten alloy long rod projectiles impacting thick-walled cylinder targets. The model is capable of predicting the critical ricochet angle when the projectile impacts the target.