Numerical simulation on ballistic penetration of composite case

The ballistic penetration process of the aramid fiber/epoxy resin composite case was numerically simulated based on LS-DYNA dynamic finite element software display algorithm. The velocity variation laws of the bullet in the composite case were obtained under different incident angles and initial velocity conditions. The calculation results show that under 90°, 60° and 30° incident angle, absorbed energy of the bullet in the composite case is the lowest, and residual velocity can reach the maximum value when tungsten bullet and armor-piercing bullet inject vertically. With the decrease of the incident angle, interaction time between bullet and target as well as kinetic energy loss increase, with the result that residual velocity becomes smaller;when residual velocity reaches a certain value, the bullet starts to ricochet. The critical velocity was obtained through calculation. The calculation results agree well with the experimental results.