Kevlar织物软壁包容环抗冲击数值仿真分析研究

针对机匣包容性问题,提出Kevlar平纹织物本构模型的拟合方法,分别采用单层壳、多层壳、层合壳三种有限元建模方式对Kevlar织物软壁包容环弹道冲击过程进行模拟,发展了机匣包容性仿真分析模型。结果表明,多层壳模型和层合壳模型的计算结果更准确,并且可以通过调节摩擦因子使仿真结果与试验结果更接近。在此基础上研究了撞击点位置和弹体入射姿态对弹体剩余速度的影响。结果表明:在较小偏移距离内,撞击点的位置对剩余速度的影响可以忽略不计;滚转角和俯仰角对剩余速度影响较小,而对于偏航角,当角度大于30°时,剩余速度会随着角度的增大明显呈下降趋势,且弹体出射姿态也会发生明显变化。

Investigation on the high speed impact numerical simulation of Kevlar fabrics soft-wall containment

For the fan blade-out problem, a fitting method of constitutive model of Kevlar fabric was proposed. The ballistic impact numerical model of Kevlar soft-wall containment was established by three modeling methods: single-layer shell model, multi-layer shell model and stacked shell model and the simulation model was developed to evaluate the containment capability of the fan case. The results show that multi-layer shell model and staked shell model are more accurate, and simulation results are closer to experimental results by adjusting the friction factor. Based on this, the influence of impact position and incident attitude of projectile on its residual velocity was studied. The results show that the influence of the impact position is negligible within a small offset distance. The roll angle and pitch angle have little effect.While for yaw angle, when it is greater than 30°, the residual velocity will obviously decrease with angle increment, and the attitude of the emergent projectile will change significantly.