卵形弹体斜侵彻双层大间隔921A钢板数值模拟研究

运用显式动力学有限元软件LS-DYNA,对卵形弹体斜侵彻双层大间隔921A钢板的问题进行了数值模拟研究,分析了初始速度和初始倾角的影响. 研究结果表明:倾斜穿甲过程中弹体受到不对称载荷的作用,直接导致弹体结构响应不对称及弹道偏转,靶板间隔的存在加剧了弹体的转动. 初始速度的提高易造成弹体头部远靶板侧卵形弧段变形破坏;初始倾角的增大则会使弹体头部近靶板侧卵形弧段和尾部变形破坏. 弹道偏转规律则较为复杂:初始倾角一定,速度较低时,倾角变化幅度较大,弹体质心运动轨迹偏转较大;速度较高时,尤其是弹体结构发生破坏后,弹体姿态角剧烈变化. 初始速度一定,随着初始倾角的增大,弹体穿甲过程中的倾角和姿态角变化幅度都变大,容易发生跳弹.

Numerical Study of Ogive-Nose Projectiles Oblique Penetrating Double-Layered Spaced 921A Steel Targets

A numerical study of ogive-nose projectiles oblique penetrating double-layered spaced 921A steel targets was conducted by LS-DYNA and the influence of initial velocity and initial oblique angle on the dynamic response of projectiles was analyzed. The results indicate that the projectile suffers asymmetric load during the penetration process which leads to the asymmetric structure deformation and deflection of trajectory. Space between the two targets could aggravate the rotation of projectiles. Increase of initial velocity will make the arc segment away from the target breakage, while increase of initial oblique angle will make the the arc segment near to the target damage. The regular pattern of ballistic deflection is rather complex. At the constant initial oblique angle, oblique angle varies significantly at lower initial velocity resulting in poor ballistic stability, while attitude angle changes drastically at higher initial velocity especially when the projectile structure has been destroyed. Under the constant impact velocity, the variation amplitudes of both oblique angle and attitude angle increase with the increase of initial oblique angle which makes the projectile liable to ricochet.