考虑弹丸侵蚀的垂直侵彻混凝土模型及算法研究

The projectile vertical penetration concrete model and algorithm considering mass loss

现有试验表明:当弹丸侵彻速度低于1000m/s时,因侵彻过程中与混凝土会发生摩擦碰撞,其中损失的质量的总量与弹丸初始侵彻的动能成线性关系。本文利用此侵蚀规律提出了一种考虑弹丸侵蚀的垂直侵彻混凝土靶侵彻模型及算法,此模型中弹丸侵彻阻力由空腔膨胀理论模型计算。采用本文的模型预测了弹丸侵彻混凝土过程中的弹丸头部形状的变化、质量损失、侵彻深度等,将模型计算结果与实验数据对比发现,侵彻深度误差小于10%,质量损失误差在15%以内,表明了模型具有良好的精度和实用性。

Existing experiments show that when the striking velocities of the projectiles are less than 1000m/s, due to the frictional collision with the concrete, the relationship between the total amount of mass loss and initial kinetic energy of projectile is linear. In this paper a penetration model and algorithm of the normal penetration of concrete target using the above erosion variation are proposed, in which the projectile penetration resistance is calculated via the cavity expansion theory. The model can predict the changes of nose shape, mass loss and depth of penetration during penetration of concrete target. Comparison with experimental data indicates that the model has a good prediction capability with the penetration depth error less than 10%, mass loss less than 15%. It shows that the model has good accuracy and practicability.