Mechanisms of manifestation of strength upon high-speed intrusion of metal jets into metals and brittle materials

Abstract

Mechanisms of manifestation of strength upon penetration of cumulative jets into metals and brittle materials have been analyzed on the basis of studying the kinetics of intrusion. In contrast to intrusion into metals, which proceeds with a smooth variation in the velocity, the process of penetration of a cumulative jet into a brittle material is intermittent: the initial stationary intrusion stops and recommences after some time in an unstable form. The revealed features have been explained from the viewpoint of radial action of a cavern in a brittle material on a cumulative jet, when the primary intrusion of a jet causes radial convergence of fragments of cavern walls and the secondary penetration through the regions of interaction. The necessary conditions for the radial action are the high strength resistance and high destruction rate of brittle material is, providing the destruction and convergence of cavern walls. The collapse of the cavern and the secondary penetration terminate with the arrival of the unloading wave at the zone of primary intrusion.