陶瓷/金属复合靶受12.7mm穿甲燃烧弹侵彻时弹靶破碎特征

弹靶破碎特征对陶瓷/金属复合装甲的抗弹性能有明显的影响，针对这一现象，进行12.7 mm穿甲燃烧弹垂直侵彻不同陶瓷材料下的陶瓷/金属复合靶板的实验研究。通过观测回收的弹芯及靶体陶瓷宏观破坏形貌，分析不同陶瓷材料与弹芯及陶瓷主要破坏特征之间的关系；通过对碎块的多级筛分称重，开展对不同陶瓷材料下弹芯及陶瓷面板的碎块尺度分布规律的研究。试验结果表明不同断裂韧性对陶瓷和弹的破碎形态及碎块粒径分布有明显影响：当陶瓷的断裂韧性增大时，弹芯小碎片的质量减小，大质量碎片增加，破碎程度减小；陶瓷半锥角增大，径向裂纹减少，陶瓷锥内破碎区碎块尺度呈增大趋势，故整体陶瓷锥破碎区占比提升；弹芯碎块及破碎后的陶瓷碎块粒径累计质量分布符合幂律分布模型。其中弹体碎裂主要分为两个部分，较大的碎块主要是由压剪断裂及应力卸载所导致的拉伸断裂所致，细碎化只发生在弹体头部，主要是由应力波产生的微裂纹与冲击诱发的粒间裂纹相互作用所致；径向裂纹及陶瓷锥是陶瓷冲击破坏的主要表现形式。

Fragmentation Characteristics of 12.7mm Armor-piercing Incendiary Projectile and Ceramic/Metal Composite Target DuringPenetration

Ballistic impact tests are conducted using 12.7 mm AP and ceramic/metal composite armor with different ceramic materials. The relationship between different ceramic materials and the main failure characteristics of the recovered projectile core and ceramics is analyzed by observing the macro failure characteristics. A multistage screening and weighing of fragments of the projectile core and target with different ceramic materials is carried out to analyze the size distribution of the fragments. The results show that fracture toughness has obvious effects on the fracture morphology and particle size distribution of both the ceramics and the projectile. As the fracture toughness of ceramics increases, the mass of small fragments decreases, the mass of large fragments increases, and the degree of breakage decreases. In addition, radial cracks decrease with the increase in the fracture cone angle of the ceramic, leading to an increase in the overall volume of the ceramic cone as well as in the percentage of the fragmented area. The ceramic fragments are mostly large particle sizes. The overall broken scale of the ceramic cone increases, and the broken degree decreases. The size distribution of fragments in the projectile and ceramic cone meets the Rosin-Rammler distribution model. As for the fragmentation of the projectile, larger fragments are mainly caused by the compression shear fracture and tensile fracture due to stress unloading, while smaller fragmentation only occurs at the nose of the projectile, mostly due to the interaction between the microcracks generated by stress waves and the intergranular cracks induced by the impact. The main failure characteristics of the ceramic panel are radial cracks and ceramic cones.