Numerical simulation on fragment armor-piercing against sandwich plate with fiber reinforced composite cores

The energy transform in the process of fragment armor-piercing against a sandwich plate with fiber reinforced composite cores (made up of superimposed steel plate, composite material plate and steel plate laminated) was considered. The fragment simulation projectile (FSP) penetrating into different kinds of sandwich plates with high velocity were numerically simulated and the ballistic limits of fragment piercing 16 kinds of sandwich plates were obtained. The credibility of the numerical simulation method was verified by comparing its results with the experimental ones. Under critical fragment perforation, the correlation between the energy absorption ratio of the each part of the sandwich plate and the structural size was studied by analyzing the numerical simulation results. The results show that the energy absorption ratio is constant for different thickness core plate(for aramid fiber core, 10.41%, for glass fiber core, 2.68%), the internal energy in core plate is quadratically increased with the increase of its thickness. On this basis, the calculation method for ballistic limit velocity of fragment penetrating into sandwich plate with fiber reinforced composite cores was obtained.