刚性卵形头弹撞击角度对编织复合材料层合板侵彻特性的影响
Influence of the impact angle of rigid ogival-nosed projectiles on the penetration characteristics of woven composite laminates

利用一级气炮发射卵形头弹撞击2 mm厚度的编织复合材料层合板，撞击角度分别为0°、30°和45°，通过高速相机记录弹靶撞击过程，并获得弹体速度数据。基于拟合公式处理试验数据，计算获取弹道极限，分析撞击角度对弹道极限、靶板能量吸收率及其失效模式的影响规律及机制。结果表明：弹体撞击角度为45°时，靶板弹道极限最高，其次为0°，撞击角度为30°时最小。随着冲击角度增加，层合板损伤形状从菱形逐渐转变为椭球形，损伤面积随冲击速度增加而增大，且45°冲击时层合板损伤面积最大，0°和30°冲击时损伤面积近似相等。弹体初始撞击角度对靶体失效模式存在影响，弹体撞击角度为0°时，纤维断口主要是剪切应力导致的横截面。撞击角度为30°时，纤维断口主要是剪切应力和拉伸应力导致的斜截面。45°斜撞击时，纤维断口主要是拉伸应力导致的横截面。 The 2 mm thick woven composite laminates were impacted by the ogival-nosed projectiles launched by a one-stage gas gun, and the impact angle was 0°, 30° and 45°. The process of projectiles impacting targets were recorded with photos of a high-speed camera and the velocities of the projectiles were obtained. The influence of the impact angles on the ballistic limits, the energy absorption efficiency of the targets and failure mechanisms was analyzed by using the fitted formula to deal with the experimental data. The results show that the ballistic limit impacted by 45° is the highest, followed by 0° and 30° impact. The damage area shape of laminates gradually changes from rhombus to ellipsoid with the increase of the impact angle and the damage area increases with the increase of the impact velocity. Damage area of laminate is the largest at 45°, and the damage area is approximately equal at 0° and 30°. The impact angle of projectile has great influence on the failure mode of plate, the fiber fracture is main cross section caused by shear stress when 0° impact and that is oblique section by shear stress and tensile stress for 30° impact. For 45° impact, the fiber fracture is cross section caused by tensile stress. 中央高校基本业务费资助项目（Y17-07；3122016C001）