碰撞倾角对碎片云分布影响的数值模拟

研究超高速斜碰撞所形成的二次碎片云的分布特性. 采用SPH与Lagrange耦合的方法计算了靶板上的穿孔尺寸随碰撞倾角的变化,并在此基础上模拟了碰撞倾角对二次碎片云分布的影响. 计算结果与实验拟合结果表明,所采用的耦合方法可以很好地模拟穿孔尺寸和二次碎片云分布;当碰撞倾角增大到60°时,法线碎片云的质心轨迹与直线碎片云的质心轨迹明显分离,并且反跳碎片云中弹丸材料的粒子数目将显著增加.

Numerical Simulation for the Influence of Impact Angle on Debris Clouds Distribution

Investigates the distribution characteristics of secondary debris clouds generated during a hypervelocity oblique impact.A SPH technique coupled with Lagrangian method is applied to calculate the dimension of penetrated hole on the target plate impacted by hypervelocity projectiles at various impact angles.Based on this the influence of the impact angle on the debris cloud distribution is simulated.Compared to the results fited to the experimental data,the calculated results show that the dimension of penetrated hole and the distribution of secondary debris cloud are both well simulated using the coupling method.As the impact angle is increased over 60°,the trajectory of the mass center of normal debris cloud deviates obviously from that of in-line debris cloud,and the particle number of the projectile material contained in the ricochet debris increases markedly.