Al/Mg阻抗梯度材料超高速撞击机理数值仿真研究

文章采用数值仿真方法研究了Al/Mg阻抗梯度材料在超高速撞击下的响应过程，分析了冲击波在阻抗梯度材料中的传播规律，计算了撞击过程中的能量耗散情况，并与弹丸撞击铝合金靶的结果进行了比较。研究结果表明，相对于铝合金材料，Al/Mg阻抗梯度材料：1）延长了冲击波的传播时间，使峰值压力脉冲的比冲量提升了30%～50%；2）提高了塑性功和内能转化量，使不可逆功增加了10%。由此证明阻抗梯度材料的防护性能优于铝合金。

Numerical study on hypervelocity impact mechanism of Al/Mg wave impedance-grade material

The propagation of shock wave in Al/Mg wave impedance-grade material target is studied by numerical simulations. The duration of the shock wave in the target, the plastic work and the internal energy converted from the kinetic energy of the projectile are obtained. It is indicated that the integrals of the pressure over time in the wave impedance-grade material target are increased by 30%~50%as compared with those in the aluminum alloy target at the velocity range of 3.0~7.0 km/s. Meanwhile, the plastic work and the internal energy rise by 10%when the aluminum target is replaced by the Al/Mg wave impedance-grade material target under the same impact conditions. All results support the conclusion that the wave impedance-grade target performs better than the aluminum alloy target in protection against hypervelocity projectiles.