Efficiency of needle structure at hypervelocity impact

The paper presents a numerical investigation of an efficiency of a needle structure at a hypervelocity impact with a spherical projectile. A modeling was performed using a smoothed particle hydrodynamics method implemented in Ansys/Ls-Dyna explicit software and a verified model. We investigated hypervelocity impacts of the spherical projectile with needle structure at different initial velocities in the range of 4190-9200 m/s and both normal and oblique impact angle. The investigations revealed efficiency of a needle structure in comparison with a solid structure of the same mass at a normal impact angle. It was shown that the character of hypervelocity impact of the spherical projectile with needle structure did not change qualitatively when the impact angle changed, and the needle structure preserved its capability to resist a hypervelocity impact.