Initiation of Detonation in Explosives by Impact of Projectiles

H.S. Yadav

doi:10.14429/dsj.56.1880

H.S. Yadav 404, Nyati Hermitage, Ramnagar, NDA RD, Bavdhan, Pune

DOI: https://doi.org/10.14429/dsj.56.1880

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) flatended
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, Vj
2 D = K0 , where
V j and D denote the velocity and diameter of the jet, and K0 is a constant of the explosive.