关键词: 椭圆截面弹体, 双侧向载荷, 侵彻, 结构响应

Abstract: Based on the bending theory of arbitrary-section beams, the concept of the neutral axis is introduced. The yield response model of a free beam with elliptical cavity section under axial force and double lateral bending moment is established. Numerical simulations and existing experiment verify the reliability of the yield response model. The results show that, compared with the circular projectile with the same cross area, the bending ability of the elliptic projectile is weakened on the short axis and strengthened on the long axis. The introduction of the initial roll angle of the projectile with an elliptical section leads to a change in the neutral axis of the weak surface of the projectile. When the neutral axis is near the long axis, the bending resistance of the projectile decreases. Suppose the projectile enters the plastic yield state. In that case, the position of the plastic zone also appears in different directions of the projectile with the change of the azimuth of the neutral axis. The research results can be used to preliminarily judge the structural stability of the elliptic projectile body at the initial stage of hitting the target, and guide the structural design of such a projectile.

Key words: elliptical cross-section projectile, double lateral loading, penetration, structural response