Crater expansion of jet oblique penetration into the thin metal plate

The asymmetric interaction between various hypervelocity threats and inclined plates is an important issue in the armor design field. Most existing research does not consider the influence of asymmetry of the inclined target on the shaped charge (SC) jet reaming. In this work, the jet flow rate was analyzed by selecting an arbitrary section coincident with the jet axis to derive the formula of the final crater radius in all radical directions at any inclination angle. Experiments and numerical simulations with shell-less phi 56 mm SC were carried out to verify the theoretical model. Results show that the model is suitable for oblique penetration crater prediction under a small inclination angle (<= 45 degrees) of the thin target. The major and minor axial lengths of the final crater and the offset between the minor axis and the geometric center G of the initial crater increase with the increase in the inclination angle of the target.

Automated summary

This research analyzed the interaction between shaped charge jets and inclined armor, and proposed a theoretical model to predict oblique penetration craters. Experimental and numerical simulation results confirmed the applicability of the model under small inclination angles.