关键词: 类椭圆截面弹体, 斜侵彻, 有限厚混凝土, 弹道特性

Abstract: To investigate the ballistic characteristics of a quasi-elliptical cross-section projectile penetrating finite- thickness concrete targets, tests were carried out on the normal and oblique penetration of quasi-elliptical cross-section projectiles into concrete targets with different thicknesses. Combined with numerical simulation using the FEM-SPG algorithm, the trends of the longitudinal acceleration and trajectory deflection angle of the projectile during different penetration process were analyzed. The effects of factors such as impact velocity, target plate thickness, oblique angle，rotation angle and attack angle on the trajectory deflection were discussed. The research results show that the trajectory deflects toward the small end, and the deflection mainly occurs in the tunnel stage and the plugging stage, when a quasi-elliptical cross-section projectile penetrates a target plate of finite thickness. As the thickness of the target plate increases, the trajectory deflection angle increases. The deflection caused by the cratering stage is only 1.4% in the final deflection angle by numerical simulation. There is a critical impact speed , which makes the deflection angle of the normal penetration trajectory decrease with the increase of the penetration speed above this target impact speed, while below this critical value, an inverse relationship is observed. Furthermore, the critical speed demonstrates non-monotonic dependence on target thickness, exhibiting an initial increase followed by progressive reduction until stabilization occurs. As the angle of attack increases (-6°~+6°), the trajectory changes from downward deflection to upward in the same oblique angle. The trajectory deflection angle is less than 2°, which has good ballistics stability in 2° angle of attack, within the range of 0°~30° oblique angle. The attitude stability of the projectile generally weakens first and then increases with the increase of the rolling angle in the xoz plane. When the rolling angle is less than 150°, the projectile shows a negative angle of attack after it ends interacting with the target.

Key words: quasi-elliptic cross-sectional projectile, oblique penetration, finite-thick concrete targets, ballistics