Two Analytical Models for Ballistic Limit of Metallic Targets Struck by Rigid Sarp-Nosed Projectiles
Jiang Zhigang,Zeng Shouyi,Zhou Jianping
(National University of Defence Technology，changsha，410072)

Abstract: Two models are developed for ballistic impact of moderately thick meta llic plates struck by rigid projectiles with conical or ogival noses. The initial stage is characterized by ductile hole enlargement and radial plastic flow of the plate materials. The plug formation is considered in the second stage of the two-stage plugging model. The formulas for energy dissipated by the ductile hole enlargement are derived from cylindrical cavity expansion approx imation. The penetration depth X₁ during the first stage is determined by minimizing the total energy dissipated during the two-stages for the two-stage ductile hole enlargement model, or by using spherical cavity expansion approximation for the two-stage ductile hole enlargement model, analytical formulas for critical impact energy and ballistic limits are obtained.The accuracy of these models is discussed by comparing their predictions with previously published ballistic test results and the other analytical formulas.
Keywords: penetration/perforation, engineering model, metallic target, ballistic limit.