How the liner material metallurgical texture affects the shaped charge jet break-up time

Abstract
Since the hollow charge phenomenon was discovered in the 19 century many discoveries have been made that have tumed the shaped charge jet formation and penetration mechanics into a status close to engineering. Still important questions remain to be answered. It was found by trial and error for example that by cold pressing copper to form the liner an increase in the jet break-up time was obtained. It is shown now that this production process prepares the internal metallurgical structure of the liner material for easy formation of shear bands. As a result the frequency of their formation increases, the jet breaks into larger number of fragments and the Vpl parameter value reduces. The evidence bringing to this conclusion is discussed in detail and recommendations for future studies are outlined.