Simulation and analysis on the drag acceleration characteristic of rigid projectiles into ductile metallic plates

摘要

The impact of projectiles perforating plastic metallic plates was studied in order to obtain deceleration characteristic of projectiles in the process. Based on cylindrical cavity-expansion theory, several new Formulas of perforation drag acceleration and dissipative energy with take into account three interconnected perforation stages were presented. Perforation experiments that have been performed by SIMLAB Norway on aluminium plates with four thicknesses were simulated using the non-linear finite element code LS-DYNA. Calculations with new model were also carried out. Analytical and numerical results were compared to the experimental findings, and good agreement was in general obtained. Deceleration characteristics in different perforation stages of projectiles were analyzed. Theoretic reference and analytical method were provided for deceleration characteristic evaluation of sharp-nose projectiles and small mass charges.