THE ROLE OF TANGENTIAL VELOCITY IN EXPLOSIVE INITIATION BY FRAGMENT IMPACT

Abstract

An initiation study is presented in which we examine the effect of the normal and the tangential velocity components of a fragment that impacts a covered and a bare Comp-B explosive. The study is based on calibrated numerical Lagrangian simulations using the LS-Dyna hydrocode. The influence of the fragment strength and the steel cover thickness on the detonation threshold were also examined, for different impact angles. The velocity threshold results are presented and compared to a modified Jacobs-Roslund initiation model, obtained by substituting the orientation angle by the impact angle. Up to a certain impact angle value the modification appears to fit the results of the simulations.