Double explosively-formed ring (DEFR) warhead

A warhead configuration for forming a hole through a wall of a target, the warhead configuration comprising:

• (a) a charge of explosive material, said charge having an axis and a front surface, said front surface including two annular front surface portions circumscribing said axis, one of said annular front surface portions being an inner annular portion, another of said annular front surface portions being an outer annular portion, said inner annular portion being disposed between said axis and said outer annular portion, each of said two annular front surface portions being configured so as to exhibit a concave profile as viewed in a cross-section through said charge parallel to said axis, at least part of said concave profile of each of said two annular front surface portions being configured such that a vector projecting outward from said part in a direction normal to said annular front surface portion diverges from said axis;
• and
• (b) a liner including a first liner disposed adjacent to at least part of said inner annular portion and a second liner disposed adjacent to at least part of said outer annular portion, said charge and said liner being configured such that, when said charge is detonated, material from said first liner is formed into a first forward-directed expanding explosively formed ring and material from said second liner is formed into a second forward-directed expanding explosively formed ring,
• wherein said inner and outer annular front surface portions and said liner are configured such that, when the warhead is detonated with said front surface proximal to a plane and said axis inclined at an angle relative to a line orthogonal to said plane, said first and second expanding explosively formed rings impinge on said lane so as to define inner and outer generally-elliptical footprints, respectively, on said plane.