2A12铝合金单层板对平头弹抗撞击特性研究

INVESTIGATION ON THE RESISTANCE PERFORMANCE OF 2A12 ALUMINUM ALLOY THICK TARGETS AGAINST BLUNT-NOSED PROJECTILES

为研究2A12铝合金板的抗冲击特性,进行了平头弹体撞击6 mm厚度的铝合金板实验研究,撞击速度范围为120 m/s~330 m/s,分析弹体初始速度对靶板抗冲击性能的影响。由实验数据拟合得到弹体弹道极限和速度曲线,结果表明,随弹体初速的增大,靶板的能量吸收率先骤减后趋于稳定。靶板主要发生剪切冲塞破坏,并且靶板结构变形随弹体初速的增加而减小。此外,基于Abaqus有限元软件,采用修改的J-C本构关系及其失效准则进行弹体撞击靶体的仿真计算,在验证仿真模型有效性的基础上分析靶板失效机理,发现不同冲击速度时靶板失效机理相似,弹体初始速度对其影响不大。

In order to investigate the impact resistance of the 2A12 aluminum alloy plate,blunt-nosed projectiles were launched with the impact velocity ranging from 120 m/s to 330 m/s to hit aluminum alloy target plates with a thickness of 6 mm,and the influence of the initial impact speed on the impact resistance of targets was analyzed.The ballistic limit and velocity curve of projectiles were obtained by fitting the data of the experiment.The results show that the energy absorption of the target first decreases sharply and then keeps stable with the increase of the initial velocity of the projectile.Meanwhile,the target plate mainly undergoes shear failure,and the structural deformation of the target plate decreases as the velocity of the projectile increases.Moreover,based on the ABAQUS/Explicit finite element software,the modified J-C constitutive relation and fracture criterion were used to calculate the projectile impact target model.And the failure mechanisms of targets were analyzed on the base of verifying the validity of the simulation model.It has been found that the failure mechanisms of targets are similar under different impact speeds,and the initial velocity of the projectile has little effect on the failure mechanism of target.