Analysis of Anti-jet Penetration Characteristics of Axial Single-cell / Multi-cell Closed Structure

Abstract

To analyze the mechanical properties of jet penetration on a single-cell / multi-cell liquid composite closed structure, the motion equation of jet penetrating a metal target is established, and the energy equation of the penetration system is derived. The simulation results show the radial convergence effect of the liquid in the single-cell increases with the increase of the height of the inner cavity of the closed structure. The radial convergence effect of liquid in multi-cell also has the same phenomenon, but the phenomenon of liquid disjunction appears, which leads to the convergence of liquid into segments. The pressure in the single-cell liquid appears at the bottom of the cell, but the multi-cell liquid appears in the last cell. The pressure distribution of the single-cell is concentrated on the bottom of the cell, and the pressure distribution is circular. The pressure distribution of multi-cell is more uniform, and there is no obvious concentrated distribution phenomenon. The energy of the closed cell structure increases with the increase of the height and the number of the cell.

Investigation on anti-penetration capability of water filled aluminum alloy cell structure to the shaped charge jet

“…µ is the relative density, which is defined as the ratio of the current density ρ to the initial density ρ 0 minus 1. The liquid is described by the null empty material model and the Gruneisen state equation (11). The air domain is also described by the null empty material model, but the state equation is given by linear polynomial [19]:…”

“…As to the single cell structure, the diesel filled metal closed structures with circular, quadrilateral and hexagonal were designed in [16,21]. Moreover, Zhao et al [11] designed the axial multi-cell structure based on the diesel filled metal closed single cell structure. These structures are shown in figure 4(a).…”

“…Research on liquid armor is relatively scarce. The current visible research contents are embodied in liquid properties [9], penetration theory [10] and structure type [11]. Even if there is some literature on the closed structure filled liquid, there are still shortcomings in the research.…”

“…The propagation and reflection behavior of shock wave after jet penetrated into liquid were not considered in literature [8] and [9]. The literature [11] did not use the jet penetration behavior to design the closed structures. Therefore, the anti-jet penetration theory and structural design of liquid filled metal cell structure still need to be studied and updated.…”