Tungsten Core Penetrator Upgrade Guide
- Details
- Category: Tungsten Information
- Published on Saturday, 07 October 2017 10:52
Tungsten is known to be the key raw material for the manufacture of armour piercing projectiles.
The conventional tungsten core penetrator is made of tungsten nickel iron high gravity alloy, but in practice, the self sharpening performance of tungsten core penetrator has been less than that of depleted uranium ammunition.
Some materials experts believe that the tungsten wire and zirconium into composite materials, can once again upgrade armor piercing performance. Zirconium is a rare metal with remarkable corrosion resistance, high melting point, ultra high hardness and strength. The tungsten / zirconium based amorphous alloy is a composite material, the zirconium based amorphous alloy is a bonding phase, and the tungsten filament is an reinforcing phase, and the material is not only of high strength, but also of great density.
A large number of studies have shown that the dynamic compressive strength of composites containing 80% volume fraction tungsten wire is more than 2500 MPa, 60% higher than tungsten alloy, and the density is no less than 17 g/cm3. In the case of high stress or high strain rate, the composite is prone to local shear and has high shear sensitivity and shear self sharpening like lean uranium alloys.
To test the effect, the experts made a comparative test of tungsten filament / zirconium based penetrator and tungsten alloy penetrator:
1.At the same target speed, the self sharpening effect of the tungsten / zirconium based amorphous composite core is obvious, its crater diameter is smaller than tungsten alloy crater more than 10%, and at the same target speed, small diameter crater penetration resistance is smaller. Therefore, the penetration depth of tungsten wire zirconium base / amorphous composite core is larger than tungsten alloy in normal penetration.
2.There is a threshold velocity in the penetration process of tungsten / zirconium based amorphous composite core, when the penetration rate is below this threshold, the failure mode of the core of the tungsten / zirconium based amorphous composite exhibits an adiabatic shear failure similar to that of a depleted uranium alloy, when the penetration rate is higher than the threshold, the failure mode becomes the buckling and reflow of tungsten wire. The phenomenon of "hanging wall" appears, and the threshold velocity increases with the increase of tungsten wire diameter.
3. The smaller the tungsten wire diameter is, the higher the volume fraction of tungsten filament, the greater the contact area between tungsten and amorphous alloys, and the higher the strength of the tungsten wire itself, the finer the tungsten filament is, the more stable it will be at high penetration.
Comprehensive comparison, tungsten filament / zirconium based penetrator has stronger penetration and self sharpening performance than conventional tungsten core penetrator, but this kind of penetrator needs ultra-fine tungsten wire to achieve the desired effect, the manufacturing cost should be higher than the traditional tungsten core penetrator.
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