Prediction Model for Penetration and Cratering of Jetting Projectile Charge into Steel Targets

Abstract

The radius of jetting projectile charge (JPC) varies significantly from the head to the tail, resulting in the crater formed with a large and uniform radius when penetrating steel target. Current methods for calculating crater radius typically use the average radius without considering JPC radius distribution, leading to large errors in the calculation. Therefore, it is necessary to introduce JPC radius distribution when predicting JPC penetration and cratering. By incorporating the radius distribution in the calculation of JPC break-up time, the modified break-up time model was used to obtain the prediction model for penetration depth. Based on the current jet (JET) cratering theory, JPC radius distribution was introduced to derive the prediction model for crater radius of JPC penetration. The X-ray tests and numerical simulations were used to obtain the radius and velocity distribution of JPC. Finally, the prediction model was verified using data from static penetration tests and literature. The results show that the penetration depth calculated using the modified model had a small error compared to the test results, therefore, the modified model could predict the variation of the crater radius with the penetration depth. And the variation of crater radius was in good agreement with the tests, and accorded with the characteristics of uniform crater radius of JPC penetration. The findings have important guiding significance for JPC design and evaluation.