Weibing Li

Effect of the Liner Material on the Shape of Dual Mode Penetrators

The effect of the liner material density and elongation on the shape of dual mode penetrators is studied by using the LS-DYNA software. Characteristics of liners made of five types of materials (aluminum, pure iron, copper, tantalum, and tungsten) under the same conditions of the liner volume or liner mass are compared. It is established that it is better to choose liner materials with good dynamic elongation and moderate density, such as pure iron and copper, to form good dual mode penetrators, namely, the explosively formed penetrator (EFP) and the jetting projectile charge (JPC). Characteristics of penetrators formed from aluminum, steel 20, and copper are considered. The simulation results are in good agreement with x-ray imaging experimental results.

Effects of Multi-Point Initiation Control Parameters on Mach Wave Overpressure

Effects of the multi-point initiation control parameters (i.e., the initiation diameter and number of initiation points) on Mach wave overpressure are investigated. The interaction of a double symmetric detonation wave caused by two-point initiation is analyzed employing the Whitham method, thus obtaining the trace of triple point, the pressure and the area of the Mach wave acting on metallic liner at different initiation diameters. The pressure of Mach wave at different initiation points and initiation diameters was calculated. It is noted that the area of the Mach wave decreases but the pressure of the Mach wave increases as the initiation diameter increases. The pressure of central ultrahigh-pressure area at the vertex increases as the number of initiation points increases, but to be a constant when the initiation point number increases to a certain amount.

Research on the skirt tail explosively formed projectile stable shaping technology

The effect of the arc-cone liner configuration parameters on explosively formed projectile (EFP) flight stability is studied experimentally. The effect of the liner edge structure on the EFP formation is computed numerically. The results show that an EFP formed by a liner whose thickness is 0.046 times the charge caliber has improved flight stability and can perforate a steel armor 0.5 times the charge caliber thick in the case of large stand-off distances. A good tail skirt EFP can be formed by choosing appropriate parameters: the liner-to-charge diameter ratio in the interval 0.96–0.98, the liner edge thickness equal to 0.0020–0.0025 times the charge caliber, and the liner edge chamfer of 45–50°.