| || Initiation of Detonation in Explosives by Impact of Projectiles
Author : Yadav, H. S.
Source : Defence Science Journal ; Vol:56(2) ; 2006 ; pp 169-177
Subject : 620.261 Explosives ;623.4 Armaments and Ballistics;531.55 Projectiles
Keywords : Detonation;Projectiles;Explosives;Shock waves impact;Projectile impact;Flyer plate projectiles;Flat-ended projectiles;Round-ended projectiles
Abstract : This paper presents a study of initiation of detonation in explosives by the impact of projectiles. The shock wave produced by the impact of projectiles has been considered as the stimulus for initiation of detonation. Three types of projectiles, namely (i) flyer plate, (ii) flat-ended rod, and (iii) round-ended rod or a shaped charge jet, have been considered to impact and produce a shock wave in the explosives. Deriving relations for the parameters of impact-generated shock wave in the explosives and projectiles, and the sound velocity in the compressed explosives, it has been shown that the difference of kinetic energy of the flyer plate before and after the impact, which is equal to the total energy of the shock wave in the explosives, leads to critical energy criterion for shock initiation of explosives. In this study, the critical criterion has been used to derive the relations for initiation of explosives by a shaped charge jet, Vj2 D = K0 , where Vj and D denote the velocity and diameter of the jet, and K0 is a constant of the explosive.