US 11,725,916 B2
Fragmentation pattern, optimized for drawn cup warheads with a dome and cylindrical wall
William McNicholas, Ellettsville, IN (US); Joshua E. Gwaltney, Sandborn, IN (US); Eric Scheid, Bloomington, IN (US); Matt E Cummings, Bedford, IN (US); and Andrew Richard Davis, Mesa, AZ (US)
Assigned to The United States of America, as Represented by the Secretary of the Navy, Washington, DC (US)
Filed by The United States of America, as represented by the Secretary of the Navy, Crane, IN (US)
Filed on Jul. 28, 2022, as Appl. No. 17/876,231.
Claims priority of provisional application 63/228,278, filed on Aug. 2, 2021.
Prior Publication US 2023/0032125 A1, Feb. 2, 2023
Int. Cl. F42B 12/22 (2006.01); F42B 12/24 (2006.01); F42B 27/00 (2006.01)
CPC F42B 12/24 (2013.01) [F42B 12/22 (2013.01); F42B 27/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A frangible munitions device optimized for a dome and cylinder which yields a plurality of fragments having shapes corresponding to a predetermined embossment pattern upon explosive rupture, comprising:
a dome top having an inner surface; and
a hollow cylinder having an inner surface and an axis;
said inner surface defining a first set of inner regular hexagonal embossments formed into said dome and cylinder and aligned with said axis of said cylinder; and
said inner surface defining a second set of outer pre-deformed hexagonal shapes that distort to produce regular hexagonal shapes after drawing into the cylinder wall;
wherein said second set of outer pre-deformed hexagonal shapes are separated by sharp transition regions;
wherein said first and second shapes are embossed in a repeated pattern around said hollow cylinder and said dome top;
wherein said dome yields a plurality of fragments having shapes corresponding to said first set of inner regular hexagonal embossments upon explosive rupture; and
wherein said cylinder yields a plurality of fragments having shapes corresponding to said second set of outer pre-deformed hexagonal embossments upon explosive rupture.