不同形状破片撞击铝合金靶板的破坏模式和规律数值研究

Numerical investigation on failure mode and law of different shape fragments impacting aluminum alloy target

利用有限元软件ABAQUS/Explicit建立破片撞击靶体模型,分析撞击物形状对靶体失效特性的影响规律及机理。通过公式拟合得到弹道极限和速度曲线,研究靶体的抗撞击性能。分析弹靶接触方式和破片形状对弹靶撞击过程、靶体失效模式和耗功的影响。结果表明:面撞击时,弹道极限与扩孔圆周呈反比,靶体发生剪切冲塞失效;点撞击时,弹道极限与扩孔面积呈反比,靶体失效为花瓣型开裂,圆球撞击兼有冲塞失效和花瓣开裂。

The model of fragments impacting targets was buih by finite element software ABAQUS/Explicit and the influence of the shapes of fragment on the failure mechanism of targets was analyzed. The ballistic limit and velocity curves obtained by the formula were used to study the impact resistance of the target. By analyzing the influence of impacting modes and fragment shapes on impact processes, target failure modes and energy consumption of target, it is found that the ballistic limit is inversely proportional to the circumference of the hole and the failure mode of targets is shear plug when the impact mode is surface contact impact. The ballistic limit is inversely proportional to the area of the hole, and the failure mode of the target is petal-type cracking when the impact mode is point contact impact. The failure mode of target is both plug failure and petal cracking when impacted by the ball.