上下非对称结构弹体侵彻金属薄板的特性及薄板破坏形式

In order to support the theoretical design of terminal damage of hypersonic missile and the basic theory of armor⁃piercing mechanics of special⁃shaped projectile, the penetration ability of asymmetrically shaped projectile penetrating metal target and the damage mechanism of target plate need to be solved. The velocity variation and deflection characteristics of the projectile are analyzed through the experiment of asymmetrically shaped projectile penetrating the multi⁃layer spaced 921A steel plate and the numerical simulation based on Abaqus / Explicit, VUMAT and Python subroutines. The damage mechanism of target plate is analyzed from damage morphology and energy dissipation, and the applicability of the research results in practical engineering application is discussed. The results show that the asymmetric structure has the ability to maintain the stability of projectile attitude. When the initial velocity is lower than 600 m / s, the velocity drop and the ballistic limit increase with the increase of the oblique angle, and the failure modes of the target plate are shear plugging, pealing and transverse deformation. When the initial velocity is higher than 600 m / s, the ballistic limit curves of different oblique angles overlap, the dimensionless velocity drop decreases with the increase of the initial velocity, and the failure mode of target plate changes to ductile enlargement, pealing and fragmentation. During the penetration progress, the tangential component of plastic work done has the largest proportion, the circumferential component is the smallest, and the axial and radial plastic works are similar. During the high⁃speed penetration, the kinetic energy of plate fragments is 25% - 50% of the plastic work done. The scaled model based on geometric similarity can reflect the speed change of the prototype projectile during the high⁃speed penetration and the damage characteristics of trget plate.