球头弹低速斜侵彻下薄板穿甲破坏机理研究

为探讨球头弹低速斜侵彻下靶板的破坏机理,通过系列弹道试验,对比分析了不同初始速度下弹体的变形,靶板的破坏模式,以及靶板的破口大小及形状；同时采用ANSYS/LS-DYNA对弹靶作用过程进行了数值模拟。结果表明：低速斜侵彻下靶板响应非完全对称,根据受力特征可将靶板划分为四个不同区域,即接触区,弯曲区,拉伸区和对称区；薄板的穿甲破坏可分为四个不同的阶段,即隆起变形,碟形变形,弯曲变形,弹体贯穿阶段；不同初始速度下靶板出现四种典型的穿甲破坏模式,随着初始速度的增加依次为隆起—碟形变形,隆起—碟形变形—拉弯撕裂破坏,隆起—碟形变形—拉弯剪切破坏,隆起—拉弯剪切破坏。斜侵彻下靶板破口形状为椭圆形,随着初始速度的增加,破口长径不断减小,形状由椭圆形向卵形过渡。

Experimental investigation on the failure modes of the targets subjected to oblique impact of the projectiles with hemispherical nose

To explore the failure modes of the targets subjected to oblique impact of the projectiles with hemispherical nose, ballistic tests had been carried out and the attitude of the projectiles was captured with the high-speed camera. The damage modes of projectiles as well as targets were analyzed and the apertures of the targets were measured. It was shown that the dynamic response of the target was not completely symmetric under oblique impact and the target was divided into four partitions according to mechanic characteristics which were contact area, bending area, tensile area and symmetric area. The penetration process was divided into four stages which was bulge, dishing, bending and perforating according to the deformation modes. The failure modes of the targets consist of four typical patterns with the variation of the initial velocity of the missiles. The first one was bulge-dishing deformation when the initial velocity was low to the ballistic limit and the second one was bulge-dishing-tensile bend tearing when the velocity was higher. The third one was bulge-dishing- tensile bend shearing with the increase of the velocity and the forth one was bulge- tensile bend shearing when the velocity was largely higher than the ballistic velocity. The aperture of the targets in the front view was elliptical when subjected to oblique impact of the projectiles with hemispherical nose and it gradually transferred to oval with the increase of the velocity.