椭圆截面截卵形刚性弹体正贯穿加筋板能量耗散分析

In order to obtain the residual velocity of elliptical section truncated oval rigid projectile penetrating stiffened plate, according to the failure characteristics of elliptical section projectile penetrating target plate, it is considered that the main energy dissipation modes of target plate during penetration are plug shear deformation work and kinetic energy, hole expanding plastic deformation work, petal dynamic work and bending deformation work, dishing deformation work and lateral dishing deformation of the stiffened plate. Each energy calculation method is deduced theoretically, and the strain rate effects of target hole enlargement, petal bending and sag deformation are quantitatively considered in the calculation. According to the energy conservation relationship, the prediction formulas of residual velocity and ballistic limit velocity of elliptical cross-section projectiles are obtained, and the model is validated by experimental results. The results show that the penetration model considering the strain hardening and strain rate effect of the target plate can accurately predict the residual velocity of the projectile. With the increase of the ratio of the long axis to the short axis of the elliptical cross-section projectile body, the ballistic limit velocity of the target plate increases approximately linearly. When the ratio of the long axis to the short axis is less than 3, the main energy dissipation of the stiffened plate is the petal bending deformation energy and dishing deformation energy.