An explosively formed projectile (EFP) is known for its ability to penetrate vehicle armor effectively. Understanding how an EFP’s physical parameters affect its performance is crucial to development of armor capable of defeating such devices. The present study uses two flyer plate radii of curvature to identify the experimental effects of the flyer plate’s radius of curvature on the measured projectile velocity, depth of penetration, and projectile shape. The Gurney equation is an algebraic relationship for estimating the velocity imparted to a metal plate in contact with detonating explosives. The authors of this research used a form of the Gurney equation to calculate the theoretical flyer plate velocity. Two EFP designs that have different flyer plate radii of curvature, but the same physical parameters and the same flyer-weight to charge-weight ratio should theoretically have the same velocity. Tests indicated that the flyer plate’s radius of curvature does not affect the projectile’s velocity and that a flat flyer plate negatively affects projectile penetration and formation.

Meeting Name

17th Biennial Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, 2011 APS SCCM (2011: Jun. 26-Jul. 1, Chicago, IL)


Geosciences and Geological and Petroleum Engineering

Second Department

Mining Engineering

Keywords and Phrases

Explosively Formed Projectile; EFP; Performance; Radius

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2012 The Authors, All rights reserved.

Publication Date

01 Jul 2012