目的 以盘形弹超高速撞击薄板为研究对象，对碎片云特征速度模型进行分析。方法 针对不同冲击压力下的盘形弹体材料Cu-OFHC和薄板材料Al 6061-T6，计算冲击波和稀疏波等熵卸载作用下粒子速度的区别，研究不同卸载压力下稀疏波等熵卸载过程对碎片云特征速度的影响。结果 利用稀疏波等熵卸载理论求解了碎片云特征速度，并对Bless模型特征速度进行修正，得到了盘形弹体超高速撞击薄板的碎片云特征速度等熵修正模型。结论 对比Bless模型计算结果，等熵卸载修正模型对实验的预测更好，尤其在更高速度撞击下对碎片云头部速度的预测显示出更好的精确度。

The work aims to analyze the characteristic velocity model of the debris cloud by focusing on the hypervelocity impact of a disk projectile on a thin plate. The difference in particle velocity under isentropic unloading of shock waves and sparse waves for disk projectile material Cu-OFHC and thin plate material Al 6061-T6 under different impact pressure was calculated, and the effect of isentropic unloading of sparse waves on the characteristic velocity of the debris cloud under different unloading pressure was studied. The sparse wave isentropic unloading theory was used to solve the characteristic velocity of the debris cloud, and the Bless model characteristic velocity was modified to obtain an isentropic correction model for the characteristic point velocity of the debris cloud caused by the hypervelocity impact of a disk projectile on a thin plate. Compared with the calculation results of the Bless model, the isentropic unloading modified model shows better accuracy in predicting the experimental results, especially in predicting the velocity of the debris cloud head under higher velocity impacts.