Low-velocity ballistic experiments were carried out to study the perforation-resistant mechanisms of warship topside composite armor system, which was simulated by composite laminates at the front and homogeneous steel plates at the back. Failure modes and energy absorbing mechanisms were investigated and the influence of the area density of front composite armors on total perforation resistance of combined targets was analyzed. Based on the experiments, an equation was obtained to predict the residual velocities in the case of low-velocity perforation of combined targets by hemispherical-nosed projectiles according to the failure modes of the targets. The results show that under low velocity perforation, combined targets mainly exhibit local damage. A few amounts of fiber at the impact side of front composite armor are sheared by the projectile. Failure modes of front composite armors are mainly fiber tensile rupture while for steel backing plates, failure modes are primarily petaloid damage. The whole energy-absorbing capability of combined targets increases with increasing the area density of front composite armors. It is shown that theoretical predictions coincide with the experimental results in terms of residual velocities.%为研究半穿甲战斗部动能侵彻下舰船舷侧复合装甲结构的抗穿甲机理,以均质钢板前置复合材料板模拟舰船舷侧复合装甲结构,采用低速弹道冲击试验,研究了结构的典型破坏模式和吸能机理,分析了前置复合装甲板的面密度对组合结构靶板整体抗穿甲性能的影响.在此基础上,根据靶板的破坏模式,得到了球头弹丸低速贯穿组合靶板的剩余速度预测公式.结果表明,组合靶板在弹丸低速冲击下主要呈现局部破坏,前置复合装甲板的破坏模式主要为纤维拉伸断裂,迎弹面存在少量的纤维剪切断裂,而钢质背板则主要呈现花瓣开裂破坏；组合靶板的整体抗弹性能随前置复合装甲板面密度的增加而提高；将理论预测剩余速度值与实验结果进行了比较,二者吻合较好.
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