Investigation on the jet penetrated metal-diesel closed structures in condition of single-layer and multi-layer

Abstract

For improving the protective performance of Armor, a multi-layer metal-diesel closed structure (MLMDCS) was proposed. The concept of equivalent layer number n and specific residual head velocity (SRHV) for describing the anti-jet penetration performance of single-layer metal-diesel closed structure (SLMDCS) and MLMDCS was put forward. The finite element simulation method by experimental verification was used to simulate the shaped charge jet (SCJ) penetrates the MLMDCS and SLMDCS. The simulation results show that when the equivalent layer number n (n>1) is the same, the residual head velocity of the jet through the MLMDCS is lower than that of the SLMDCS, and the time is longer than that of the SLMDCS. The energy consumption of jet in MLMDCS is more than that of in SLMDCS. The jet head becomes blunt after penetrating out the MLMDCS, but the head shape remains basically unchanged after the jet penetrates out the SLMDCS. The velocity streamline of diesel at the intersection of each layer in the MLMDCS is disordered, which forms local turbulence and disjoint phenomenon. The distribution positions of the diesel velocity streamline and pressure in the SLMDCS are basically the same. Compared with the SLMDCS, the MLMDCS has better anti-jet penetration properties, and the anti-jet penetration properties of the MLMDCS are better with the increase in the equivalent layer number. The research results provide a design reference for the new generation protective armor.