Accession Number : ADD015168

Title :   Controlled Fragmentation with Fragment Mix.

Descriptive Note : Patent, Filed 31 May 77, patented 20 Aug 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Pearson, John

Report Date : 20 Aug 1991

Pagination or Media Count : 13

Abstract : In the present invention the profile and orientation of grooves formed on the interior surface of the single walled cylinder control shear fracture trajectories and permit tailoring of the fragment yield. the groove pattern utilized in a cylindrical warhead is made up of two families of parallel helical grooves which intersect to form a repeating diamond pattern. The diamonds so produced have their major-axis-parallel to the longitudinal axis cylindrical. Also, the individual groove profile is defined by a steep wall and a shallow wall with a sharp root. Upon detonation of high explosive contained within the warhead, the cylindrical fails in shear starting at the root of each groove and following a logarithmic spiral to the outer surface. The non symmetrical profile of the groove determines which of two possible shear trajectories the fracture will take.

Descriptors :   AXES, CONTROL, CYLINDRICAL BODIES, DETONATIONS, DIAMONDS, EXTERNAL, FRAGMENTATION, GROOVING, HIGH EXPLOSIVES, INTERNAL, LENGTH, PATTERNS, PROFILES, SHALLOW DEPTH, SHARPNESS, SHEAR PROPERTIES, STARTING, SURFACES, SYMMETRY, TRAJECTORIES, WALLS, WARHEADS

Subject Categories : Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE