An charge, annular EFPs with cone liner, was designed which can form two ring-shaped projectiles--(Double Explosively Formed Ring. DERF). DEFR is a novel warhead in particular it concerns warheads having cutting and breaching effects in the conventional brick walls or reinforced concrete walls, which make it suitable for perforating requirements in the urban operation. DEFr warhead consists of a charge of explosive material and two annular metal liners. The front surface of the charge includes two annular front surface portions, portion, circumscribing the axis. When the charge is detonated, materials from the two annular liners are formed into two EFR projectiles and can breach effects in the concrete target. The ringshaped projectile formation process and characteristic of penetrating concrete target was studied by numerical simulation. The results indicate that the double annular liners configured with certain angle can form two asymmetric backward folding ring-shaped projectiles. The radial dispersion of the projectiles is smaller than the deflection angle that designed. Whether penetrating perpendicularly or obliquely in a 1.0 charge diameter (CD) stand-off, the formed inner EFR projectile can produce holes at least 1.7 CD in diameter in the concrete wall. The outer EFR projectiles bounce and can't engage penetration effectively because of the angle of incidence in the process of perpendicular impact; The outer EFR projectiles can perforate the target partially in the process of oblique impact. The inner EFR projectile together with outer EFr projectile can form a larger hole through a wall of a target in the process of oblique impact than in the process of perpendicular impact.
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