Abstract The damage pattern of rear wall/witness plate could express the fragmentation features of projectile relatively, in the ground-based tests of Whipple shield and its improved structure. In this paper, the damages of rear wall for 20 Whipple shield tests are statistically analyzed, and the linkage between the damages with impact conditions (impact velocity and plate-thickness-to-sphere-diameter ratio) are obtained. The damage pattern of rear wall, or the fragmentation pattern of sphere is defined as Intact, Ruptured and Smashed. The perforation hole on rear wall is described quantitatively. The fragmentation patterns under different impact conditions are analyzed based on the propagation and evolution of shock waves. A series of SPH simulations prove and extend the analytical and experimental works, and clearly reveal the normalized relationship between fragmentation pattern and impact condition.

中文翻译：

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球体超高速撞击薄板的破碎形态分析

摘要 在惠普尔盾牌及其改进结构的地面试验中，后壁/目击板的损伤模式可以相对表达弹丸的破片特征。本文对20次Whipple盾构试验后壁的损伤进行了统计分析，得到了损伤与冲击条件（冲击速度和板厚球径比）之间的联系。后壁的损坏模式，或球体的破碎模式定义为完整、破裂和粉碎。对后壁上的穿孔进行了定量描述。基于冲击波的传播和演化，分析了不同冲击条件下的碎裂模式。一系列 SPH 模拟证明和扩展了分析和实验工作，