Anexplosively formed penetrator (EFP), also known as anexplosively formed projectile, aself-forging warhead, or aself-forging fragment, is a special type ofshaped charge designed to penetratearmor effectively, from a much greater standoff range than standard shaped charges, which are more limited by standoff distance. As the name suggests, the effect of the explosive charge is to deform a metal plate into a slug or rod shape and accelerate it toward a target. They were first developed asoil well perforators by American oil companies in the 1930s, and were deployed as weapons in World War II.[1][2]
A conventionalshaped charge generally has a conical metal liner that is forced by an explosive blast into ahypervelocity jet ofsuperplastic metal able to penetrate thick armor and knock out vehicles. A disadvantage of this arrangement is that the jet of metal loses effectiveness the further it travels, as it breaks up into disconnected particles that drift out of alignment.
An EFP operates on the same principle, but its liner is designed to form a distinct projectile that will maintain its shape, permitting it to penetrate armor at greater distance.[3] The dish-shaped liner of an EFP can generate a number of distinct projectile forms, depending on the shape of the plate and how the explosive is detonated.[4]
An EFP's penetration is more strongly affected by the density of its liner metal compared to a conventional shaped charge. At 16.654 g/cm3,tantalum is preferable in delivery systems that have limitations in size, like theSADARM, which is delivered by ahowitzer. For other weapon systems without practical limitations on warhead diameter, a less expensive copper liner (8.960 g/cm3) of double the diameter can be used instead. An EFP with a tantalum liner can typically penetrate steel armor of a thickness equal to its diameter – or half that amount with a copper liner instead.[5] By contrast, a conventional shaped charge can penetrate armor up to six times its diameter in thickness, depending on its design and liner material.
Some sophisticated EFP warheads have multipledetonators that can be fired in different arrangements causing different types of waveform in the explosive, resulting in either a long-rod penetrator, an aerodynamic slug projectile, or multiple high-velocity fragments. A less sophisticated approach for changing the formation of an EFP is the use of wire mesh in front of the liner, which causes the liner to fragment into multiple penetrators.[6]
In addition to single-penetrator EFPs (also called single EFPs or SEFPs), there are EFP warheads whose liners are designed to produce more than one penetrator; these are known as multiple EFPs, or MEFPs. The liner of an MEFP generally comprises a number of dimples that intersect each other at sharp angles. Upon detonation, the liner fragments along these intersections to form up to dozens of small, generally spheroidal projectiles, producing an effect similar to that of a shotgun. The pattern of impacts on a target can be finely controlled based on the design of the liner and the manner in which the explosive charge is detonated. A nuclear-driven MEFP was apparently proposed by a member of theJASON group in 1966 for terminalballistic missile defense.[7][8] A related device was the proposednuclear pulse propulsion unit forProject Orion.
Extensive research is going on in the zone between jetting charges and EFPs, which combines the advantages of both types, resulting in very long stretched-rod EFPs for short-to-medium distances (because of the lack of aerostability) with improved penetration capability.
EFPs have been adopted as warheads in a number of weapon systems, including theCBU-97 andBLU-108 air bombs (with the Skeetsubmunition), theM303 Special Operations Forces demolition kit, theM2/M4 Selectable Lightweight Attack Munition (SLAM), theSADARM submunition, theSMArt 155 top-attack artillery round, theLow Cost Autonomous Attack System, theTOW-2Banti-tank missile, and theNASM-SRanti-ship missile.
An EFP eight inches [20 cm] in diameter threw a seven-pound [3 kg] copper slug atMach 6, or 2,000 meters per second. (A.50-caliber bullet, among the most devastating projectiles on the battlefield, weighs less than two ounces [57 g] and has amuzzle velocity of 900 meters per second.)
— Rick Atkinson,The Washington Post[9]
EFPs have been used inimprovised explosive devices againstarmoured cars, for example[10] in the 1989 assassination of German bankerAlfred Herrhausen (attributed to theRed Army Faction)[11] and byHezbollah in the 1990s.[12] They saw widespread use inIEDs byinsurgents in Iraq against coalition vehicles.[13]
The charges are generally cylindrical, fabricated from commonly available metal pipe, with the forward end closed by a concave copper or steel disk-shaped liner to create a shaped charge. Explosive is loaded behind the metal liner to fill the pipe. Upon detonation, the explosive projects the liner to form a projectile.
The effects of traditional explosions like blast-forces and metal fragments seldom disable armored vehicles, but the explosively formed solid copper penetrator is quite lethal—even to the new generation ofmine-resistant vehicles (which are made to withstand ananti-tank mine), and many tanks.[14]
Often mounted on crash barriers at window level, they are placed along roadsides at choke points where vehicles must slow down, such as intersections and junctions. This gives the operator time to judge the moment to fire, when the vehicle is moving more slowly.[15]
Detonation is controlled bycable,radio control,TV or IR remote controls, or remote arming with apassive infrared sensor, or via a pair of ordinary cell phones. EFPs can be deployed singly, in pairs, or in arrays, depending on thetactical situation.
Non-circular explosively formed penetrators can be formed based on modifications to the liner construction. For instance, U.S. patents 6606951[16] and 4649828[17] are non-circular in design. US6606951B1 is designed to launch multiple asymmetric explosively forged penetrators horizontally in 360 degrees. US4649828A is designed to form several clothespin shaped EFPs, increasing hit probability.
In addition, a simplified EFP (SIM-EFP) can be made using a rectangular liner, similar to alinear shaped charge or modified platter charge.[18] This design can be further modified to be similar to US4649828A with multiple cut and bent steel bars lined side by side instead of a singular liner.
In Northern Ireland similar devices have been discovered that were developed by dissident Republican groups for intended use against the police.[19][20]In Northern Ireland, the weapon was first used in March 2014 when a PSNI Land Rover was targeted as it travelled along the Falls Road in west Belfast.[21]A police car was destroyed by an EFP detonated by a command wire in Strabane, Co Tyrone on 18 November 2022.[22]
The spacecraftHayabusa2 carried a small carry-on impactor. It was dropped offHayabusa2 on to an asteroid and detonated. The explosion created a copper explosively formed penetrator, which hit the asteroid with a velocity of 2 km/s. The crater created by the impact was a target for further observations by the onboard instruments. The shaped charge consisted of 4.5 kg of plasticizedHMX and a 2.5 kg copper liner.[23]
This approach will be used again onTianwen-2 mission.
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