Penetration of Armour by High Velocity Projectiles and Munroe Jets
Ministry of Supply London United Kingdom
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Following a method due to Bethe, it is shown that the hydrostatic pressure Po necessary to enlarge a long cylindrical hole in a ductile material, which does not show strain hardening, is about 3.5Y where Y is the yield stress. A method for taking strain-hardening into account is given for armour this increases Po by 8 per cent., for mild steel by about 30 per cent. The plastic region extends in steel to a distance of about twelve times the radius of the hole.
- Ammunition and Explosives