Linear unstable effect on shaped-charge jet under axial pulse current

To improve the capability of passive electromagnetic armor against shaped charge jet (SCJ), the linear perturbation control equation of SCJ under the axial pulse current is constructed by magneto hydrodynamic instability theory and superposition theorem, and the variation law of SCJ pinching and kinking instability growth rates related to viscosity and time are analyzed. The deformation trend of SCJ is obtained and the formula used to calculate the SCJ deformation can be get by numerical means. Finally, the static penetration experiment with 39.2 mm diameter armor-piercing projectile and the kinking experiment with 1.75 mm diameter copper wire are carried out. The experimental results demonstrate that the axial pulse current can destroy the SCJ because of necking or kinking perturbation and confirm the validity of the theoretical analysis.