Influence of Tungsten Powder Particle Grade on the Densityof the Liner of Perforating

To increase the penetration performance of perforating bullet, the powder particle grade technique is studied by increasing the density of tungsten powder liner. By using the method of geometric configuration analysis and the effect of cramming and cladding between the big and small particles, an idealized particle grading model considering the morphology of tungsten powder particles is constructed. The compact density formula of the packing system formed by the interaction of large and small tungsten powder particles and the relation formula of each parameter are obtained. Tungsten powder particle grading technology is applied to make the tungsten powder liner of perforating, and the bulk density of tungsten powder and density of the liner are tested. The result shows that the the bulk density of tungsten powder is increased from 7.96 g/cm3 to 9.65 g/cm3 with a growth rate of 21.2%. The density of perforating liner is increased from 14.70 g/cm3 to 15.69 g/cm3 with a growth rate of 7.6%. This has fully proved that the particle grade model is right and the tungsten powder partical grade has prominent effect on density increasment of the liner of perforating. The tungsten powder partical grade has been proved an effective method to increase the performance of perorating bult.