Explosively formed penetrator

An explosively formed penetrator (EFP), also known as an explosively formed projectile, a self-forging warhead, or a self-forging fragment, is a special type of shaped charge designed to penetrate armor 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 as oil well perforators by American oil companies in the 1930s, and were deployed as weapons in World War II.[1][2]

Formation of an EFP warhead. USAF Research Laboratory.

Design
External video
video icon EFP animation on YouTube

Difference from conventional shaped charges
Formation of an EFP
MPB mine showing the face of its explosively formed penetrator

A conventional shaped charge generally has a conical metal liner that is forced by an explosive blast into a hypervelocity jet of superplastic 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 the SADARM, which is delivered by a howitzer. 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 multiple detonators 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 the JASON group in 1966 for terminal ballistic missile defense.[7][8] A related device was the proposed nuclear pulse propulsion unit for Project 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 the CBU-97 and BLU-108 air bombs (with the Skeet submunition), the M303 Special Operations Forces demolition kit, the M2/M4 Selectable Lightweight Attack Munition (SLAM), the SADARM submunition, the SMArt 155 top-attack artillery round, the Low Cost Autonomous Attack System, and the TOW-2B anti-tank missile.

An EFP eight inches [20 cm] in diameter threw a seven-pound [3 kg] copper slug at Mach 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 a muzzle velocity of 900 meters per second.)

— Rick Atkinson, The Washington Post[9]

Use in improvised explosive devices
An improvised explosive device in Iraq. When activated, the concave copper shape on top becomes an explosively formed penetrator.

EFPs have been used in improvised explosive devices against armoured cars, for example[10] in the 1989 assassination of German banker Alfred Herrhausen (attributed to the Red Army Faction)[11] and by Hezbollah in the 1990s.[12] They saw widespread use in IEDs by insurgents 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 of mine-resistant vehicles (which are made to withstand an anti-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 by cable, radio control, TV or IR remote controls, or remote arming with a passive infrared sensor, or via a pair of ordinary cell phones. EFPs can be deployed singly, in pairs, or in arrays, depending on the tactical situation.

Non-circular explosively formed penetrators

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 a linear 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]

Asteroid impactor

The spacecraft Hayabusa2 carried a small carry-on impactor. It was dropped off Hayabusa2 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 plasticized HMX and a 2.5 kg copper liner.[23]

See also

References
  1. Ismay, John (2013-10-18), "The Most Lethal Weapon Americans Faced in Iraq", At War blog, The New York Times, archived from the original on 2018-01-04, retrieved 2018-03-26
  2. William P. Walters (1 October 1990). "The Shaped Charge Concept, Part III. Applications of Shaped Charges" (PDF). U.S. Army Ballistic Research Laboratory. Archived (PDF) from the original on 28 April 2017. Retrieved 26 March 2018.
  3. "DoD Directive 2000.19E, "Joint Improvised Explosive Device Defeat Organization (JIEDDO)", February 14, 2006". Archived from the original on February 15, 2007. Retrieved February 13, 2007.
  4. "U.S. Air Force Research Laboratory description of an EFP". Archived from the original on 2006-03-16. Retrieved 2006-03-29.
  5. ng.pdf, on the web, US military testing of SOFDK
  6. U.S. Patent 5540156: Selectable effects EFP warhead
  7. Explosively Produced Flechettes; JASON report 66-121, Institute for Defense Analysis, 1966
  8. Interview with Dr. Richard Blankenbecler Archived 2011-09-12 at the Wayback Machine
  9. Atkinson, Rick (1 October 2007). "There was a two-year learning curve ... and a lot of people died in those two years". The Washington Post. Archived from the original on 4 December 2016. Retrieved 24 December 2010.
  10. Stratfor, "The Imminent Spread of EFPs" Archived 2020-01-03 at the Wayback Machine, April 11, 2007
  11. Hambling, David (July 29, 2008). "Superbomb Mystery: The Herrhausen Assassination". Wired. Archived from the original on January 18, 2009. Retrieved November 5, 2008.
  12. Gareth Porter (October 25, 2008). "POLITICS: U.S. Military Ignored Evidence of Iraqi-Made EFPs". Archived from the original on 2008-11-12. Retrieved 2008-11-05.
  13. Robert Bryce (January 22, 2007). "Surge of danger for US troops". Salon. Archived from the original on 2008-06-27.
  14. "The truck the Pentagon wants and the firm that makes it - USATODAY.com". usatoday30.usatoday.com. Archived from the original on 2012-06-26. Retrieved 2020-07-09.
  15. Correspondent, Sean Rayment, Defence (2006-06-24). "The precision-made mine that has 'killed 17 British troops'". The Daily Telegraph. ISSN 0307-1235. Archived from the original on 2020-07-09. Retrieved 2020-07-09.{{cite news}}: CS1 maint: multiple names: authors list (link)
  16. Klein, Arnold S. "Bounding anti-tank/anti-vehicle weapon". patents.google.com/. Archived from the original on 2020-02-29. Retrieved 2020-02-29.
  17. "Explosively forged penetrator warhead". patents.google.com. Archived from the original on 2020-02-29. Retrieved 2020-02-29.
  18. "How to build your own armour killers". privat.bahnhof.se. Archived from the original on 2020-02-18. Retrieved 2020-02-29.
  19. "Dungannon man Patrick Carty charged over 'Iraq-style IED'". BBC News. February 13, 2012. Archived from the original on January 2, 2019. Retrieved June 20, 2018.
  20. "Derry bomb was 'Iraq style mortar'". UTV Live News. 2012-12-07. Archived from the original on 2012-12-13.
  21. "New IRA claims responsibility for Strabane mortar attack on PSNI". Irish News. November 25, 2022. Retrieved November 25, 2022.
  22. "New IRA claims responsibility for Strabane mortar attack on PSNI". Irish News. November 25, 2022. Retrieved November 25, 2022.
  23. Saiki, Takanao; Sawada, Hirotaka; Okamoto, Chisato; Yano, Hajime; Takagi, Yasuhiko; Akahoshi, Yasuhiro; Yoshikawa, Makoto (2013). "Small carry-on impactor of Hayabusa2 mission". Acta Astronautica. 84: 227–236. Bibcode:2013AcAau..84..227S. doi:10.1016/j.actaastro.2012.11.010.

Further reading
  • Fundamentals of Shaped Charges, W.P. Walters, J.A. Zukas, John Wiley & Sons Inc., June 1989, ISBN 0-471-62172-2
  • Tactical Missile Warheads, Joseph Carleone (ed.), Progress in Astronautics and Aeronautics Series (V-155), Published by AIAA, 1993, ISBN 1-56347-067-5
  • The Good Soldiers, David Finkel, Picador, 2009, ISBN 978-0-312-43002-3
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