Accession Number : ADA304378

Title :   Shock Evolution After Shaped Charge Jet Impact and Its Relevance to Explosive Initiation.

Descriptive Note : Final rept. Oct 93-Oct 94,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Frey, R. ; Lawrence, W. ; Chick, M.

PDF Url : ADA304378

Report Date : FEB 1996

Pagination or Media Count : 31

Abstract : When a shaped charge jet impacts a target containing explosive, the explosive may be initiated by one of three shocks: the impact shock, a bow shock that forms in the inert plate covering the explosive, or a bow shock that forms in the explosive. In this report, numerical calculations are used to determine how thick the cover plate must be to prevent initiation by the impact shock and how much time (or distance) is required to form a bow shock in the explosive. The results show that the cover plate must be from 4 to 12 jet diameters (depending on jet velocity) thick to sufficiently attenuate the impact shock so that it will not cause initiation in a common secondary explosive. For a 7-km/s copper jet, a distance of about 8 jet diameters was required to form a bow shock in the explosive. This corresponds well to experimental data reported elsewhere.

Descriptors :   *IMPACT SHOCK, *SHAPED CHARGE JETS, *EXPLOSIVES INITIATORS, VELOCITY, EXPERIMENTAL DATA, COMPUTATIONS, IMPACT, SECONDARY, NUMERICAL ANALYSIS, EXPLOSIVES, SHOCK, EVOLUTION(GENERAL), BOW SHOCK.

Subject Categories : Ammunition and Explosives
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE