平头弹撞击角度对2A12-T4铝合金板失效特性影响的数值模拟

Numerical Simulation on Influences of Impact Angles of Blunt-nosed Projectile on Failure Characteristics for 2A12-T4 Aluminum Alloy Plates

利用有限元软件ABAQUS建立模拟模型,开展38Cr Si钢弹体撞击2A12-T4铝合金板数值模拟研究,分析撞击过程中弹体撞击角度对弹道姿态及靶体失效特性的影响。基于数值仿真和实验结果,分析靶体的失效特性,确立不同撞击条件下靶体主要失效模式的转变规律,以及由此对靶体抗撞击性能的影响。研究结果表明:弹体的弹道极限速度随其撞击角度的增大先减小后增大,弹道极限速度在撞击角度约为15°时达到最小值;弹体撞击角度对靶体失效模式存在很大影响,随着弹体撞击角度的增大,靶体主要失效模式由剪切破坏逐渐过渡到撕裂破坏,靶体的撕裂程度不断加剧;弹体初始撞击角度和速度对其在撞击过程中的弹道姿态存在影响,在弹道极限速度附近表现尤为显著。

A simulation model was established using finite element software ABAQUS, and numerical simulations of 38CrSi steel projectile impacting 2A12-T4 aluminum alloy plates were conduct then the influences of impact angles of projectile on the failure characteristics of target and ballistic attitud e were analyzed. Based on numerical simulation and experimental results, the failure characteristics of well as the influences on the impact resistance of target because of that were established. The results show that with the increases of impact angles the ballistic limit velocity decreases, and then increases, and the ballistic limit reaches the minimum when the impact angle is about 15 degrees. In addition, the impact angle of e impacting greatly influences the failure mode of target, with the projectile angle increases, the dominant failure mode of target changes fi＇om shearing to tearing, and also increasing the degree of tearing the target. The initial impact angle and velocity of projectile have great influences on the trajectory attitude of the projectile during the impacts, especially in the