混凝土靶侵彻过程中空腔膨胀响应分区

The LS-DYNA was used to simulate the process of a rigid projectile normally penetrating into a concrete target. Based on the two threshold values of ultimate compressive strain and ultimate tensile strain of the concrete, the cavity expansion response regions of the concrete target were identified and the size of each concrete response region in the penetration process was obtained. The effect of the penetration velocity on the crushed and cracked regions of the concrete was analyzed. The relationships between the boundary expansion velocity of the crushed /cracked regions and the penetration velocity were discussed. The results indicate that with increasing the initial impacting velocity, the interface velocities of the crushed/cracked regions and the radius of the crushed region increase, but the radius of the cracked region decreases. At last, the cracked region may disappear when the penetration velocity achieves a certain critical value.