长杆弹超高速侵彻砂浆靶临界速度的实验和计算

A high-strength alloy steel long-rod projectile of 30CrMnSini2A was tested at speeds of 1 381 m / s ~ 1 879 m / s into a semi-infinite mortar concrete target to determine the critical velocity for reverse decrement of penetration depth. The results show an approximate linear relationship between the penetration velocity and crater diameter, crater depth, crater volume, and ballistic aperture. When the penetration velocity is lower than 1 724 m / s, penetration depth increases with increasedvelocity;when it is higher than 1 724 m / s, penetration depth decreases with increased velocity. Penetration depth reaches its maximum when the velocity reaches 1 724 m / s. Target dissection results show that when the long-rod projectile penetrates the target at hypervelocity, the smallhitting attitude of the projectile leads to a serious deflection in the penetration trajectory, which is a “J" shape. Based on the experimental results, the modified A-T model is used to determinethe critical velocity at which the penetration depth of the long-rod projectile decreases when the long-rod projectile penetrates the mortar target at hypervelocity, to analyze the influence of different projectile and target parameters on the critical velocity, and to verify the validity of the theoretical model based on experimental data.