Experimental Verification and Numerical Simulation on Composite Rod-type Jet Molding and Power Performance

To clarify the performance of composite rod-type jet,eight kinds of composite ball imperfection covers with different materials,including polyethylene/copper,aluminum/copper,titanium/copper,iron/copper,copper/copper,molybdenum/copper,tantalum/copper and tungsten/copper,were designed,and three-dimensional numerical simulation of the forming process of rod-type jet was performed by LS-DYNA software,the power performance of the rod-type jet was analyzed,and the numerical simulation results were verified via static armor experiment.The results show that under the condition of keeping the inner cover material as red copper,the overall velocity of jet decreases with increasing the density of outer cover material,while the density of outer cover material increases with inner shell material is copper,and the kinetic energy of jet decreases with increasing the density of outer cover material.When outer cover is made of metal material,the greater the impact resistance of outer cover materials,the smaller the transmission pressure of the detonation wave in the inner cover,and the overall velocity and kinetic energy of the jet decreases with increasing the shock resistance of outer cover.By contrast,it is found that the overall velocity of polyethylene/Cu composite rod-type jet is the highest,the kinetic energy is the largest,and the armor is better,the aluminum/copper composite rod-type jet is the second.The experimental results of static armor show that the penetration depth of the steel/copper composite rod-type jet is better than that of the aluminum/copper composite rod-type jet,which is consistent with the numerical simulation results.