Numerical simulation on coupling effect and power performance of damage elements for multifunctional focusing warhead

To further enhance the lethality and damage efficiency of the circumferential fragment, a multifunctional focusing warhead has been designed based on the traditional multifunctional warhead (cylindrical charge). To investigate the coupling relationship between fragment focusing and EFP (Explosively Formed Penetrator) forming in the multifunctional focusing warhead, the liner and focusing casing were transformed into the aluminum end cap and cylindrical casing as the control groups, and AUTODYN was employed for numerical simulation. To investigate the impact of charge curvature radius on the performance of damage elements in multifunctional focusing warhead, numerical simulations were conducted to analyze the EFP formation and fragment dispersion processes for cylindrical charged warhead and multifunctional focusing warheads with three different charge curvature radii. The results show that: (1) EFP forming does not significantly impact the performance of fragment focusing. Furthermore, when the charge curvature radius (R) is appropriately selected, the fragment focusing process does not adversely affect EFP forming. (2) As the curvature radius of the charge increases, the power performance of the multifunctional focusing warhead improves. The kinetic energy and tip speed of EFP also increase, while the length-diameter ratio of EFP decreases. Additionally, the average and maximum velocities of the prefabricated fragments increase, the fragment focusing band width narrows, and the fragment density within the focusing band increases. The numerical simulation results can serve as a reference for the design of multifunctional focusing warhead.