Velocity Difference Between Particulated Shaped Charge Jet Particles for Face-Centered-Cubic Liner Materials

摘要

A model was derived to predict the average jet velocity difference betweenparticulated shaped charge jet particles. The model is based on the 'wire drawing formula presented by Kolsky, the plastic instability criterion, and the Zerilli-Armstrong constitutive equation for face-centered-cubic materials. The velocity difference expression is strongly dependent on the jet temperature and weakly dependent on the jet strain rate. Calculations were also made using the Johnson-Cook constitutive model. The average velocity difference between jet particles, the true stress at necking, and the true strain at necking were calculated using several variants of the model. Velocity difference comparisons with experimental data were made for several shaped charge designs with copper liners of various geometries.