蜂窝铝冲击波形数值计算及分析

为分析蜂窝铝结构参数以及弹丸参数对冲击波形的影响,利用LS-DYNA有限元软件建立了弹丸侵彻蜂窝铝模型,模拟了侵彻波形的发生过程。比较了蜂窝铝相对密度、胞孔角度,侵彻初速和弹头形状对冲击加速度波形的影响。结果表明,增大蜂窝铝相对密度、减小胞孔角度可以引起加速度峰值的提高和冲击脉宽的减小; 提升初始侵彻速度可以同时引起加速度峰值与脉宽的提升; 弹丸形状影响冲击波形,使用卵形弹可以获得较平缓的加速度波形。研究结果对以蜂窝铝为缓冲材料的冲击试验参数选择具有重要参考价值。

Numerical Simulation on Shock Waveform of Aluminum Honeycombs

In order to analyze the effect of projectile with different structures and aluminum honeycomb target with different material parameters on acceleration response, a nonlinear dynamic finite-element model of projectile penetrating target was established, which was simulated by LS-DYNA software. The influences of different parameters on impulse response were compared including relative density and cell wall angle of aluminum honeycomb,and the initial velocity and the shape of projectile. The results show that the peak acceleration increases, and the pulse width reduces by increasing relative density and reducing cell wall angle. The peak value and the pulse width of the acceleration increase with the increase of initial speed of bullet. The shape of bullet affects the shock waveform, and a smooth acceleration waveform can be obtained by using an oval projectile. The obtained results offer an important reference to selection of parameters in the design of impact experiment with honeycomb aluminum as cushioning material.