Numerical and experimental study of the formation and penetration of an LSC jet in different initiation manners

Abstract

The formation and influence of initiation manners on a linear-shaped charge (LSC) jet were studied through experimentation and numerical simulation. An X-ray was adopted to observe the formation process of LSC jet, and simultaneous axial stretch and edge expansion were observed in the formation. The cause of the end effect, and the influence of single end point initiation, central point initiation, two end point initiation, and time difference were discussed. Numerical simulation indicated that the end effect was caused by a combination of jet expansion in the edge direction and the "erosion" of end rarefaction waves, which could be eliminated by increasing the charge length. The jet initiated via single-point initiation produced the highest expansion velocity at the detonation termination end, and the jet initiated in two-point initiation produced the highest jet tip velocity. The initial spherical wave of central-point initiation had the effect of energy accumulation similar to conical charge, and the central jet exhibited high jet tip velocity. Central-point initiation is the most powerful in terms of general penetration ability. The penetration performance of the jet with time difference initially decreased and then increased with increasing Δt and when the general deflection was the smallest, the crack was the most symmetric.