In order to determine the impact depth of a conical projectile impacting single stiffened plate vertically, the residual velocity of the projectile after penetrating the stiffened plate must be known.The plug is formed after the conical projectile penetrating the grillage and the cross section of the plug is similar to that of the conical projectile. The petal failure is formed on the panel. By the squeeze of the conical projectile, the web plate occurs plastic deformation and the alar plate causes turnover.Based on the failure model, the energy consumption mode of the grillage was determined. During the perforation process, the energy consumption of the grillage was completed by shear deformation of the plug, kinetic energy of the plug, plastic extruding deformation of the grillage, the power work of the patels, the propagation of radial cracks and petal bending. In the view of energy, the energy formula was deduced for each energy dissipation mode and the energy consumed in the impact process was determined. The residual velocity and the ballistic limit velocity of the projectile was deduced by energy conservation principle. The comparison of the residual velocity between the analytical and the numerical results is in excellent agreement, which verifies the accuracy and reliability of the theoretical formula.%为准确掌握截锥形弹体垂直穿透单加筋板后的打击深度,需要清楚知道弹体穿甲加筋板后的剩余速度.截锥形弹正穿甲板架,形成与截锥面相同的凿块,面板产生花瓣形破坏,腹板受到锥面的挤压发生塑性变形,翼板发生翻转,在此破坏模型基础上,确定板架的能量消耗方式.穿甲过程中,板架耗能主要通过凿块的剪切变形、凿块的动能、板架的挤压塑性变形、花瓣动力功、裂缝的径向扩展和花瓣弯曲6种方式完成.从能量角度出发,对每种耗能方式进行能量公式推导,确定在穿甲过程中靶板消耗的能量,根据能量守恒原理推导弹体的剩余速度和弹道极限速度.将弹体剩余速度理论结果与数值模拟结果进行对比,吻合较好,验证了理论公式的可靠性.
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